about summary refs log tree commit diff stats
path: root/html/edit/005-sandbox.mu.html
blob: f082c7b11dac70bafb8eb771eda53264b3b6ae09 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Mu - edit/005-sandbox.mu</title>
<meta name="Generator" content="Vim/8.0">
<meta name="plugin-version" content="vim7.4_v2">
<meta name="syntax" content="none">
<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
<meta name="colorscheme" content="minimal-light">
<style type="text/css">
<!--
pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #c6c6c6; }
body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
a { color:inherit; }
* { font-size:12pt; font-size: 1em; }
.muControl { color: #804000; }
.muRecipe { color: #ff8700; }
.muScenario { color: #00af00; }
.LineNr { }
.muData { color: #ffff00; }
.Delimiter { color: #c000c0; }
.Constant { color: #008787; }
.Special { color: #ff6060; }
.Comment { color: #005faf; }
.SalientComment { color: #0000af; }
-->
</style>

<script type='text/javascript'>
<!--

/* function to open any folds containing a jumped-to line before jumping to it */
function JumpToLine()
{
  var lineNum;
  lineNum = window.location.hash;
  lineNum = lineNum.substr(1); /* strip off '#' */

  if (lineNum.indexOf('L') == -1) {
    lineNum = 'L'+lineNum;
  }
  lineElem = document.getElementById(lineNum);
  /* Always jump to new location even if the line was hidden inside a fold, or
   * we corrected the raw number to a line ID.
   */
  if (lineElem) {
    lineElem.scrollIntoView(true);
  }
  return true;
}
if ('onhashchange' in window) {
  window.onhashchange = JumpToLine;
}

-->
</script>
</head>
<body onload='JumpToLine();'>
<a href='https://github.com/akkartik/mu/blob/master/edit/005-sandbox.mu'>https://github.com/akkartik/mu/blob/master/edit/005-sandbox.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr">   1 </span><span class="SalientComment">## running code from the editor and creating sandboxes</span>
<span id="L2" class="LineNr">   2 </span><span class="Comment">#</span>
<span id="L3" class="LineNr">   3 </span><span class="Comment"># Running code in the sandbox editor prepends its contents to a list of</span>
<span id="L4" class="LineNr">   4 </span><span class="Comment"># (non-editable) sandboxes below the editor, showing the result and maybe a</span>
<span id="L5" class="LineNr">   5 </span><span class="Comment"># few other things (later layers).</span>
<span id="L6" class="LineNr">   6 </span><span class="Comment">#</span>
<span id="L7" class="LineNr">   7 </span><span class="Comment"># This layer draws the menubar buttons in non-editable sandboxes but they</span>
<span id="L8" class="LineNr">   8 </span><span class="Comment"># don't do anything yet. Later layers implement each button.</span>
<span id="L9" class="LineNr">   9 </span>
<span id="L10" class="LineNr">  10 </span><span class="muRecipe">def!</span> main [
<span id="L11" class="LineNr">  11 </span>  <span class="Constant">local-scope</span>
<span id="L12" class="LineNr">  12 </span>  open-console
<span id="L13" class="LineNr">  13 </span>  <a href='../081print.mu.html#L46'>clear-screen</a><span class="Constant"> null/screen</span>  <span class="Comment"># non-scrolling app</span>
<span id="L14" class="LineNr">  14 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a><span class="Constant"> null/filesystem, null/screen</span>
<span id="L15" class="LineNr">  15 </span>  env <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L473'>restore-sandboxes</a> env,<span class="Constant"> null/filesystem</span>
<span id="L16" class="LineNr">  16 </span>  <a href='004-programming-environment.mu.html#L402'>render-all</a><span class="Constant"> null/screen,</span> env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L17" class="LineNr">  17 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a><span class="Constant"> null/screen, null/console,</span> env,<span class="Constant"> null/filesystem</span>
<span id="L18" class="LineNr">  18 </span>]
<span id="L19" class="LineNr">  19 </span>
<span id="L20" class="LineNr">  20 </span><span class="muData">container</span> environment [
<span id="L21" class="LineNr">  21 </span>  sandbox:&amp;:sandbox  <span class="Comment"># list of sandboxes, from top to bottom. TODO: switch to &amp;:list:sandbox</span>
<span id="L22" class="LineNr">  22 </span>  render-from:num
<span id="L23" class="LineNr">  23 </span>  number-of-sandboxes:num
<span id="L24" class="LineNr">  24 </span>]
<span id="L25" class="LineNr">  25 </span>
<span id="L26" class="LineNr">  26 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L36'>&lt;programming-environment-initialization&gt;</a></span> [
<span id="L27" class="LineNr">  27 </span>  *result <span class="Special">&lt;-</span> put *result, <span class="Constant">render-from:offset</span>,<span class="Constant"> -1</span>
<span id="L28" class="LineNr">  28 </span>]
<span id="L29" class="LineNr">  29 </span>
<span id="L30" class="LineNr">  30 </span><span class="muData">container</span> sandbox [
<span id="L31" class="LineNr">  31 </span>  data:text
<span id="L32" class="LineNr">  32 </span>  response:text
<span id="L33" class="LineNr">  33 </span>  <span class="Comment"># coordinates to track clicks</span>
<span id="L34" class="LineNr">  34 </span>  <span class="Comment"># constraint: will be 0 for sandboxes at positions before env.render-from</span>
<span id="L35" class="LineNr">  35 </span>  starting-row-on-screen:num
<span id="L36" class="LineNr">  36 </span>  code-ending-row-on-screen:num  <span class="Comment"># past end of code</span>
<span id="L37" class="LineNr">  37 </span>  <a href='../081print.mu.html#L16'>screen</a>:&amp;:<a href='../081print.mu.html#L16'>screen</a>  <span class="Comment"># prints in the sandbox go here</span>
<span id="L38" class="LineNr">  38 </span>  next-sandbox:&amp;:sandbox
<span id="L39" class="LineNr">  39 </span>]
<span id="L40" class="LineNr">  40 </span>
<span id="L41" class="LineNr">  41 </span><span class="muScenario">scenario</span> run-and-show-results [
<span id="L42" class="LineNr">  42 </span>  <span class="Constant">local-scope</span>
<span id="L43" class="LineNr">  43 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
<span id="L44" class="LineNr">  44 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
<span id="L45" class="LineNr">  45 </span>  <span class="Comment"># recipe editor is empty</span>
<span id="L46" class="LineNr">  46 </span>  assume-resources [
<span id="L47" class="LineNr">  47 </span>  ]
<span id="L48" class="LineNr">  48 </span>  <span class="Comment"># sandbox editor contains an instruction without storing outputs</span>
<span id="L49" class="LineNr">  49 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[divide-with-remainder 11, 3]</span>
<span id="L50" class="LineNr">  50 </span>  <a href='004-programming-environment.mu.html#L402'>render-all</a> <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L51" class="LineNr">  51 </span>  <span class="Comment"># run the code in the editors</span>
<span id="L52" class="LineNr">  52 </span>  assume-console [
<span id="L53" class="LineNr">  53 </span>    press F4
<span id="L54" class="LineNr">  54 </span>  ]
<span id="L55" class="LineNr">  55 </span>  run [
<span id="L56" class="LineNr">  56 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L57" class="LineNr">  57 </span>  ]
<span id="L58" class="LineNr">  58 </span>  <span class="Comment"># check that screen prints the results</span>
<span id="L59" class="LineNr">  59 </span>  screen-should-contain [
<span id="L60" class="LineNr">  60 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L61" class="LineNr">  61 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L62" class="LineNr">  62 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
<span id="L63" class="LineNr">  63 </span>   <span class="Constant"> .                                                  ╎0   edit       copy       to recipe    delete    .</span>
<span id="L64" class="LineNr">  64 </span>   <span class="Constant"> .                                                  ╎divide-with-remainder 11, 3                      .</span>
<span id="L65" class="LineNr">  65 </span>   <span class="Constant"> .                                                  ╎3                                                .</span>
<span id="L66" class="LineNr">  66 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
<span id="L67" class="LineNr">  67 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L68" class="LineNr">  68 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L69" class="LineNr">  69 </span>  ]
<span id="L70" class="LineNr">  70 </span>  screen-should-contain-in-color <span class="Constant">7/white</span>, [
<span id="L71" class="LineNr">  71 </span>   <span class="Constant"> .                                                                                                    .</span>
<span id="L72" class="LineNr">  72 </span>   <span class="Constant"> .                                                                                                    .</span>
<span id="L73" class="LineNr">  73 </span>   <span class="Constant"> .                                                                                                    .</span>
<span id="L74" class="LineNr">  74 </span>   <span class="Constant"> .                                                                                                    .</span>
<span id="L75" class="LineNr">  75 </span>   <span class="Constant"> .                                                   divide-with-remainder 11, 3                      .</span>
<span id="L76" class="LineNr">  76 </span>   <span class="Constant"> .                                                                                                    .</span>
<span id="L77" class="LineNr">  77 </span>   <span class="Constant"> .                                                                                                    .</span>
<span id="L78" class="LineNr">  78 </span>   <span class="Constant"> .                                                                                                    .</span>
<span id="L79" class="LineNr">  79 </span>   <span class="Constant"> .                                                                                                    .</span>
<span id="L80" class="LineNr">  80 </span>  ]
<span id="L81" class="LineNr">  81 </span>  screen-should-contain-in-color <span class="Constant">245/grey</span>, [
<span id="L82" class="LineNr">  82 </span>   <span class="Constant"> .                                                                                                    .</span>
<span id="L83" class="LineNr">  83 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L84" class="LineNr">  84 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
<span id="L85" class="LineNr">  85 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L86" class="LineNr">  86 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L87" class="LineNr">  87 </span>   <span class="Constant"> .                                                  ╎3                                                .</span>
<span id="L88" class="LineNr">  88 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
<span id="L89" class="LineNr">  89 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L90" class="LineNr">  90 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L91" class="LineNr">  91 </span>  ]
<span id="L92" class="LineNr">  92 </span>  <span class="Comment"># sandbox menu in reverse video</span>
<span id="L93" class="LineNr">  93 </span>  screen-should-contain-in-color <span class="Constant">232/black</span>, [
<span id="L94" class="LineNr">  94 </span>   <span class="Constant"> .                                                                                                    .</span>
<span id="L95" class="LineNr">  95 </span>   <span class="Constant"> .                                                                                                    .</span>
<span id="L96" class="LineNr">  96 </span>   <span class="Constant"> .                                                                                                    .</span>
<span id="L97" class="LineNr">  97 </span>   <span class="Constant"> .                                                   0   edit       copy       to recipe    delete    .</span>
<span id="L98" class="LineNr">  98 </span>  ]
<span id="L99" class="LineNr">  99 </span>  <span class="Comment"># run another command</span>
<span id="L100" class="LineNr"> 100 </span>  assume-console [
<span id="L101" class="LineNr"> 101 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 80</span>
<span id="L102" class="LineNr"> 102 </span>    type <span class="Constant">[add 2, 2]</span>
<span id="L103" class="LineNr"> 103 </span>    press F4
<span id="L104" class="LineNr"> 104 </span>  ]
<span id="L105" class="LineNr"> 105 </span>  run [
<span id="L106" class="LineNr"> 106 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L107" class="LineNr"> 107 </span>  ]
<span id="L108" class="LineNr"> 108 </span>  <span class="Comment"># check that screen prints both sandboxes</span>
<span id="L109" class="LineNr"> 109 </span>  screen-should-contain [
<span id="L110" class="LineNr"> 110 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L111" class="LineNr"> 111 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L112" class="LineNr"> 112 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
<span id="L113" class="LineNr"> 113 </span>   <span class="Constant"> .                                                  ╎0   edit       copy       to recipe    delete    .</span>
<span id="L114" class="LineNr"> 114 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
<span id="L115" class="LineNr"> 115 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
<span id="L116" class="LineNr"> 116 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L117" class="LineNr"> 117 </span>   <span class="Constant"> .                                                  ╎1   edit       copy       to recipe    delete    .</span>
<span id="L118" class="LineNr"> 118 </span>   <span class="Constant"> .                                                  ╎divide-with-remainder 11, 3                      .</span>
<span id="L119" class="LineNr"> 119 </span>   <span class="Constant"> .                                                  ╎3                                                .</span>
<span id="L120" class="LineNr"> 120 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
<span id="L121" class="LineNr"> 121 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L122" class="LineNr"> 122 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L123" class="LineNr"> 123 </span>  ]
<span id="L124" class="LineNr"> 124 </span>]
<span id="L125" class="LineNr"> 125 </span>
<span id="L126" class="LineNr"> 126 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L62'>&lt;global-keypress&gt;</a></span> [
<span id="L127" class="LineNr"> 127 </span>  <span class="Comment"># F4? load all code and run all sandboxes.</span>
<span id="L128" class="LineNr"> 128 </span>  <span class="Delimiter">{</span>
<span id="L129" class="LineNr"> 129 </span>    do-run?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65532/F4</span>
<span id="L130" class="LineNr"> 130 </span>    <span class="muControl">break-unless</span> do-run?
<span id="L131" class="LineNr"> 131 </span>    <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L217'>update-status</a> <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[running...       ]</span>, <span class="Constant">245/grey</span>
<span id="L132" class="LineNr"> 132 </span><span class="Constant">    <a href='005-sandbox.mu.html#L132'>&lt;begin-run-sandboxes-on-F4&gt;</a></span>
<span id="L133" class="LineNr"> 133 </span>    error?:bool <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L146'>run-sandboxes</a> env, <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>
<span id="L134" class="LineNr"> 134 </span>    <span class="Comment"># we could just render-all, but we do some work to minimize the number of prints to screen</span>
<span id="L135" class="LineNr"> 135 </span><span class="Constant">    <a href='005-sandbox.mu.html#L135'>&lt;end-run-sandboxes-on-F4&gt;</a></span>
<span id="L136" class="LineNr"> 136 </span>    <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L137" class="LineNr"> 137 </span>    <span class="Delimiter">{</span>
<span id="L138" class="LineNr"> 138 </span>      <span class="muControl">break-if</span> error?
<span id="L139" class="LineNr"> 139 </span>      <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L217'>update-status</a> <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[                 ]</span>, <span class="Constant">245/grey</span>
<span id="L140" class="LineNr"> 140 </span>    <span class="Delimiter">}</span>
<span id="L141" class="LineNr"> 141 </span>    <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L468'>update-cursor</a> <a href='../081print.mu.html#L16'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
<span id="L142" class="LineNr"> 142 </span>   <span class="muControl"> loop</span> <span class="Constant">+next-event</span>
<span id="L143" class="LineNr"> 143 </span>  <span class="Delimiter">}</span>
<span id="L144" class="LineNr"> 144 </span>]
<span id="L145" class="LineNr"> 145 </span>
<span id="L146" class="LineNr"> 146 </span><span class="muRecipe">def</span> <a href='005-sandbox.mu.html#L146'>run-sandboxes</a> env:&amp;:environment, <a href='../088file.mu.html#L11'>resources</a>:&amp;:<a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>:&amp;:<a href='../081print.mu.html#L16'>screen</a><span class="muRecipe"> -&gt; </span>errors-found?:bool, env:&amp;:environment, <a href='../088file.mu.html#L11'>resources</a>:&amp;:<a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>:&amp;:<a href='../081print.mu.html#L16'>screen</a> [
<span id="L147" class="LineNr"> 147 </span>  <span class="Constant">local-scope</span>
<span id="L148" class="LineNr"> 148 </span>  <span class="Constant">load-inputs</span>
<span id="L149" class="LineNr"> 149 </span>  errors-found?:bool <span class="Special">&lt;-</span> update-recipes env, <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>
<span id="L150" class="LineNr"> 150 </span>  <span class="muControl">jump-if</span> errors-found?, <span class="Constant">+return</span>
<span id="L151" class="LineNr"> 151 </span>  <span class="Comment"># check contents of right editor (sandbox)</span>
<span id="L152" class="LineNr"> 152 </span><span class="Constant">  <a href='005-sandbox.mu.html#L152'>&lt;begin-run-sandboxes&gt;</a></span>
<span id="L153" class="LineNr"> 153 </span>  current-sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
<span id="L154" class="LineNr"> 154 </span>  <span class="Delimiter">{</span>
<span id="L155" class="LineNr"> 155 </span>    sandbox-contents:text <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L681'>editor-contents</a> current-sandbox
<span id="L156" class="LineNr"> 156 </span>    <span class="muControl">break-unless</span> sandbox-contents
<span id="L157" class="LineNr"> 157 </span>    <span class="Comment"># if contents exist, first save them</span>
<span id="L158" class="LineNr"> 158 </span>    <span class="Comment"># run them and turn them into a new sandbox</span>
<span id="L159" class="LineNr"> 159 </span>    new-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> new <span class="Constant">sandbox:type</span>
<span id="L160" class="LineNr"> 160 </span>    *new-sandbox <span class="Special">&lt;-</span> put *new-sandbox, <span class="Constant">data:offset</span>, sandbox-contents
<span id="L161" class="LineNr"> 161 </span>    <span class="Comment"># push to head of sandbox list</span>
<span id="L162" class="LineNr"> 162 </span>    dest:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
<span id="L163" class="LineNr"> 163 </span>    *new-sandbox <span class="Special">&lt;-</span> put *new-sandbox, <span class="Constant">next-sandbox:offset</span>, dest
<span id="L164" class="LineNr"> 164 </span>    *env <span class="Special">&lt;-</span> put *env, <span class="Constant">sandbox:offset</span>, new-sandbox
<span id="L165" class="LineNr"> 165 </span>    <span class="Comment"># update sandbox count</span>
<span id="L166" class="LineNr"> 166 </span>    sandbox-count:num <span class="Special">&lt;-</span> get *env, <span class="Constant">number-of-sandboxes:offset</span>
<span id="L167" class="LineNr"> 167 </span>    sandbox-count <span class="Special">&lt;-</span> add sandbox-count,<span class="Constant"> 1</span>
<span id="L168" class="LineNr"> 168 </span>    *env <span class="Special">&lt;-</span> put *env, <span class="Constant">number-of-sandboxes:offset</span>, sandbox-count
<span id="L169" class="LineNr"> 169 </span>    <span class="Comment"># save all sandboxes</span>
<span id="L170" class="LineNr"> 170 </span>    <span class="Comment"># needs to be before running them, in case we die when running</span>
<span id="L171" class="LineNr"> 171 </span>    <a href='005-sandbox.mu.html#L224'>save-sandboxes</a> env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L172" class="LineNr"> 172 </span>    <span class="Comment"># clear sandbox editor</span>
<span id="L173" class="LineNr"> 173 </span>    init:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> push <span class="Constant">167/§</span>,<span class="Constant"> null</span>
<span id="L174" class="LineNr"> 174 </span>    *current-sandbox <span class="Special">&lt;-</span> put *current-sandbox, <span class="Constant">data:offset</span>, init
<span id="L175" class="LineNr"> 175 </span>    *current-sandbox <span class="Special">&lt;-</span> put *current-sandbox, <span class="Constant">top-of-screen:offset</span>, init
<span id="L176" class="LineNr"> 176 </span>  <span class="Delimiter">}</span>
<span id="L177" class="LineNr"> 177 </span>  <span class="Comment"># run all sandboxes</span>
<span id="L178" class="LineNr"> 178 </span>  curr:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
<span id="L179" class="LineNr"> 179 </span>  idx:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
<span id="L180" class="LineNr"> 180 </span>  <span class="Delimiter">{</span>
<span id="L181" class="LineNr"> 181 </span>    <span class="muControl">break-unless</span> curr
<span id="L182" class="LineNr"> 182 </span>    curr <span class="Special">&lt;-</span> update-sandbox curr, env, idx
<span id="L183" class="LineNr"> 183 </span>    curr <span class="Special">&lt;-</span> get *curr, <span class="Constant">next-sandbox:offset</span>
<span id="L184" class="LineNr"> 184 </span>    idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
<span id="L185" class="LineNr"> 185 </span>   <span class="muControl"> loop</span>
<span id="L186" class="LineNr"> 186 </span>  <span class="Delimiter">}</span>
<span id="L187" class="LineNr"> 187 </span><span class="Constant">  <a href='005-sandbox.mu.html#L187'>&lt;end-run-sandboxes&gt;</a></span>
<span id="L188" class="LineNr"> 188 </span><span class="Constant">  +return</span>
<span id="L189" class="LineNr"> 189 </span>  <span class="Delimiter">{</span>
<span id="L190" class="LineNr"> 190 </span>    <span class="muControl">break-if</span> <a href='../088file.mu.html#L11'>resources</a>  <span class="Comment"># ignore this in tests</span>
<span id="L191" class="LineNr"> 191 </span>    $system <span class="Constant">[./snapshot_lesson]</span>
<span id="L192" class="LineNr"> 192 </span>  <span class="Delimiter">}</span>
<span id="L193" class="LineNr"> 193 </span>]
<span id="L194" class="LineNr"> 194 </span>
<span id="L195" class="LineNr"> 195 </span><span class="Comment"># load code from disk</span>
<span id="L196" class="LineNr"> 196 </span><span class="Comment"># replaced in a later layer (whereupon errors-found? will actually be set)</span>
<span id="L197" class="LineNr"> 197 </span><span class="muRecipe">def</span> update-recipes env:&amp;:environment, <a href='../088file.mu.html#L11'>resources</a>:&amp;:<a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>:&amp;:<a href='../081print.mu.html#L16'>screen</a><span class="muRecipe"> -&gt; </span>errors-found?:bool, env:&amp;:environment, <a href='../088file.mu.html#L11'>resources</a>:&amp;:<a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>:&amp;:<a href='../081print.mu.html#L16'>screen</a> [
<span id="L198" class="LineNr"> 198 </span>  <span class="Constant">local-scope</span>
<span id="L199" class="LineNr"> 199 </span>  <span class="Constant">load-inputs</span>
<span id="L200" class="LineNr"> 200 </span>  recipes:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
<span id="L201" class="LineNr"> 201 </span>  in:text <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L681'>editor-contents</a> recipes
<span id="L202" class="LineNr"> 202 </span>  <a href='../088file.mu.html#L11'>resources</a> <span class="Special">&lt;-</span> <a href='../088file.mu.html#L127'>dump</a> <a href='../088file.mu.html#L11'>resources</a>, <span class="Constant">[lesson/recipes.mu]</span>, in
<span id="L203" class="LineNr"> 203 </span>  reload in
<span id="L204" class="LineNr"> 204 </span>  errors-found? <span class="Special">&lt;-</span> copy<span class="Constant"> false</span>
<span id="L205" class="LineNr"> 205 </span>]
<span id="L206" class="LineNr"> 206 </span>
<span id="L207" class="LineNr"> 207 </span><span class="Comment"># replaced in a later layer</span>
<span id="L208" class="LineNr"> 208 </span><span class="muRecipe">def</span> update-sandbox sandbox:&amp;:sandbox, env:&amp;:environment, idx:num<span class="muRecipe"> -&gt; </span>sandbox:&amp;:sandbox, env:&amp;:environment [
<span id="L209" class="LineNr"> 209 </span>  <span class="Constant">local-scope</span>
<span id="L210" class="LineNr"> 210 </span>  <span class="Constant">load-inputs</span>
<span id="L211" class="LineNr"> 211 </span>  data:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">data:offset</span>
<span id="L212" class="LineNr"> 212 </span>  response:text, _, fake-screen:&amp;:<a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> run-sandboxed data
<span id="L213" class="LineNr"> 213 </span>  *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">response:offset</span>, response
<span id="L214" class="LineNr"> 214 </span>  *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant"><a href='../081print.mu.html#L16'>screen</a>:offset</span>, fake-screen
<span id="L215" class="LineNr"> 215 </span>]
<span id="L216" class="LineNr"> 216 </span>
<span id="L217" class="LineNr"> 217 </span><span class="muRecipe">def</span> <a href='005-sandbox.mu.html#L217'>update-status</a> <a href='../081print.mu.html#L16'>screen</a>:&amp;:<a href='../081print.mu.html#L16'>screen</a>, msg:text, color:num<span class="muRecipe"> -&gt; </span><a href='../081print.mu.html#L16'>screen</a>:&amp;:<a href='../081print.mu.html#L16'>screen</a> [
<span id="L218" class="LineNr"> 218 </span>  <span class="Constant">local-scope</span>
<span id="L219" class="LineNr"> 219 </span>  <span class="Constant">load-inputs</span>
<span id="L220" class="LineNr"> 220 </span>  <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> move-cursor <a href='../081print.mu.html#L16'>screen</a>,<span class="Constant"> 0</span>,<span class="Constant"> 2</span>
<span id="L221" class="LineNr"> 221 </span>  <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> print <a href='../081print.mu.html#L16'>screen</a>, msg, color, <span class="Constant">238/grey/background</span>
<span id="L222" class="LineNr"> 222 </span>]
<span id="L223" class="LineNr"> 223 </span>
<span id="L224" class="LineNr"> 224 </span><span class="muRecipe">def</span> <a href='005-sandbox.mu.html#L224'>save-sandboxes</a> env:&amp;:environment, <a href='../088file.mu.html#L11'>resources</a>:&amp;:<a href='../088file.mu.html#L11'>resources</a><span class="muRecipe"> -&gt; </span><a href='../088file.mu.html#L11'>resources</a>:&amp;:<a href='../088file.mu.html#L11'>resources</a> [
<span id="L225" class="LineNr"> 225 </span>  <span class="Constant">local-scope</span>
<span id="L226" class="LineNr"> 226 </span>  <span class="Constant">load-inputs</span>
<span id="L227" class="LineNr"> 227 </span>  trace<span class="Constant"> 11</span>, <span class="Constant">[app]</span>, <span class="Constant">[save sandboxes]</span>
<span id="L228" class="LineNr"> 228 </span>  current-sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
<span id="L229" class="LineNr"> 229 </span>  <span class="Comment"># first clear previous versions, in case we deleted some sandbox</span>
<span id="L230" class="LineNr"> 230 </span>  $system <span class="Constant">[rm lesson/[0-9]</span>* <span class="Constant">&gt;/dev/null</span> 2&gt;/dev/null]  <span class="Comment"># some shells can't handle '&gt;&amp;'</span>
<span id="L231" class="LineNr"> 231 </span>  curr:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
<span id="L232" class="LineNr"> 232 </span>  idx:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
<span id="L233" class="LineNr"> 233 </span>  <span class="Delimiter">{</span>
<span id="L234" class="LineNr"> 234 </span>    <span class="muControl">break-unless</span> curr
<span id="L235" class="LineNr"> 235 </span>    <a href='../088file.mu.html#L11'>resources</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L242'>save-sandbox</a> <a href='../088file.mu.html#L11'>resources</a>, curr, idx
<span id="L236" class="LineNr"> 236 </span>    idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
<span id="L237" class="LineNr"> 237 </span>    curr <span class="Special">&lt;-</span> get *curr, <span class="Constant">next-sandbox:offset</span>
<span id="L238" class="LineNr"> 238 </span>   <span class="muControl"> loop</span>
<span id="L239" class="LineNr"> 239 </span>  <span class="Delimiter">}</span>
<span id="L240" class="LineNr"> 240 </span>]
<span id="L241" class="LineNr"> 241 </span>
<span id="L242" class="LineNr"> 242 </span><span class="muRecipe">def</span> <a href='005-sandbox.mu.html#L242'>save-sandbox</a> <a href='../088file.mu.html#L11'>resources</a>:&amp;:<a href='../088file.mu.html#L11'>resources</a>, sandbox:&amp;:sandbox, sandbox-index:num<span class="muRecipe"> -&gt; </span><a href='../088file.mu.html#L11'>resources</a>:&amp;:<a href='../088file.mu.html#L11'>resources</a> [
<span id="L243" class="LineNr"> 243 </span>  <span class="Constant">local-scope</span>
<span id="L244" class="LineNr"> 244 </span>  <span class="Constant">load-inputs</span>
<span id="L245" class="LineNr"> 245 </span>  data:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">data:offset</span>
<span id="L246" class="LineNr"> 246 </span>  filename:text <span class="Special">&lt;-</span> append <span class="Constant">[lesson/]</span>, sandbox-index
<span id="L247" class="LineNr"> 247 </span>  <a href='../088file.mu.html#L11'>resources</a> <span class="Special">&lt;-</span> <a href='../088file.mu.html#L127'>dump</a> <a href='../088file.mu.html#L11'>resources</a>, filename, data
<span id="L248" class="LineNr"> 248 </span><span class="Constant">  <a href='005-sandbox.mu.html#L248'>&lt;end-save-sandbox&gt;</a></span>
<span id="L249" class="LineNr"> 249 </span>]
<span id="L250" class="LineNr"> 250 </span>
<span id="L251" class="LineNr"> 251 </span><span class="muRecipe">def!</span> render-sandbox-side <a href='../081print.mu.html#L16'>screen</a>:&amp;:<a href='../081print.mu.html#L16'>screen</a>, env:&amp;:environment, render-editor:<a href='004-programming-environment.mu.html#L400'>render-recipe</a><span class="muRecipe"> -&gt; </span><a href='../081print.mu.html#L16'>screen</a>:&amp;:<a href='../081print.mu.html#L16'>screen</a>, env:&amp;:environment [
<span id="L252" class="LineNr"> 252 </span>  <span class="Constant">local-scope</span>
<span id="L253" class="LineNr"> 253 </span>  <span class="Constant">load-inputs</span>
<span id="L254" class="LineNr"> 254 </span>  trace<span class="Constant"> 11</span>, <span class="Constant">[app]</span>, <span class="Constant">[render sandbox side]</span>
<span id="L255" class="LineNr"> 255 </span>  old-top-idx:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L509'>save-top-idx</a> <a href='../081print.mu.html#L16'>screen</a>
<span id="L256" class="LineNr"> 256 </span>  current-sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
<span id="L257" class="LineNr"> 257 </span>  row:num, column:num <span class="Special">&lt;-</span> copy<span class="Constant"> 1</span>,<span class="Constant"> 0</span>
<span id="L258" class="LineNr"> 258 </span>  left:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
<span id="L259" class="LineNr"> 259 </span>  right:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">right:offset</span>
<span id="L260" class="LineNr"> 260 </span>  <span class="Comment"># render sandbox editor</span>
<span id="L261" class="LineNr"> 261 </span>  render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
<span id="L262" class="LineNr"> 262 </span>  <span class="Delimiter">{</span>
<span id="L263" class="LineNr"> 263 </span>    render-current-sandbox?:bool <span class="Special">&lt;-</span> equal render-from,<span class="Constant"> -1</span>
<span id="L264" class="LineNr"> 264 </span>    <span class="muControl">break-unless</span> render-current-sandbox?
<span id="L265" class="LineNr"> 265 </span>    row, column, <a href='../081print.mu.html#L16'>screen</a>, current-sandbox <span class="Special">&lt;-</span> call render-editor, <a href='../081print.mu.html#L16'>screen</a>, current-sandbox
<span id="L266" class="LineNr"> 266 </span>  <span class="Delimiter">}</span>
<span id="L267" class="LineNr"> 267 </span>  <span class="Comment"># render sandboxes</span>
<span id="L268" class="LineNr"> 268 </span>  <a href='002-typing.mu.html#L1114'>draw-horizontal</a> <a href='../081print.mu.html#L16'>screen</a>, row, left, right
<span id="L269" class="LineNr"> 269 </span>  sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
<span id="L270" class="LineNr"> 270 </span>  row, <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L276'>render-sandboxes</a> <a href='../081print.mu.html#L16'>screen</a>, sandbox, left, right, row, render-from
<span id="L271" class="LineNr"> 271 </span>  <a href='001-editor.mu.html#L226'>clear-rest-of-screen</a> <a href='../081print.mu.html#L16'>screen</a>, row, left, right
<span id="L272" class="LineNr"> 272 </span>  <span class="Comment">#</span>
<span id="L273" class="LineNr"> 273 </span>  <a href='../081print.mu.html#L515'>assert-no-scroll</a> <a href='../081print.mu.html#L16'>screen</a>, old-top-idx
<span id="L274" class="LineNr"> 274 </span>]
<span id="L275" class="LineNr"> 275 </span>
<span id="L276" class="LineNr"> 276 </span><span class="muRecipe">def</span> <a href='005-sandbox.mu.html#L276'>render-sandboxes</a> <a href='../081print.mu.html#L16'>screen</a>:&amp;:<a href='../081print.mu.html#L16'>screen</a>, sandbox:&amp;:sandbox, left:num, right:num, row:num, render-from:num, idx:num<span class="muRecipe"> -&gt; </span>row:num, <a href='../081print.mu.html#L16'>screen</a>:&amp;:<a href='../081print.mu.html#L16'>screen</a>, sandbox:&amp;:sandbox [
<span id="L277" class="LineNr"> 277 </span>  <span class="Constant">local-scope</span>
<span id="L278" class="LineNr"> 278 </span>  <span class="Constant">load-inputs</span>
<span id="L279" class="LineNr"> 279 </span>  <span class="muControl">return-unless</span> sandbox
<span id="L280" class="LineNr"> 280 </span>  <a href='../081print.mu.html#L782'>screen-height</a>:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L782'>screen-height</a> <a href='../081print.mu.html#L16'>screen</a>
<span id="L281" class="LineNr"> 281 </span>  hidden?:bool <span class="Special">&lt;-</span> lesser-than idx, render-from
<span id="L282" class="LineNr"> 282 </span>  <span class="Delimiter">{</span>
<span id="L283" class="LineNr"> 283 </span>    <span class="muControl">break-if</span> hidden?
<span id="L284" class="LineNr"> 284 </span>    <span class="Comment"># render sandbox menu</span>
<span id="L285" class="LineNr"> 285 </span>    row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
<span id="L286" class="LineNr"> 286 </span>    at-bottom?:bool <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L782'>screen-height</a>
<span id="L287" class="LineNr"> 287 </span>    <span class="muControl">return-if</span> at-bottom?
<span id="L288" class="LineNr"> 288 </span>    <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> move-cursor <a href='../081print.mu.html#L16'>screen</a>, row, left
<span id="L289" class="LineNr"> 289 </span>    <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L331'>render-sandbox-menu</a> <a href='../081print.mu.html#L16'>screen</a>, idx, left, right
<span id="L290" class="LineNr"> 290 </span>    <span class="Comment"># save menu row so we can detect clicks to it later</span>
<span id="L291" class="LineNr"> 291 </span>    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">starting-row-on-screen:offset</span>, row
<span id="L292" class="LineNr"> 292 </span>    <span class="Comment"># render sandbox contents</span>
<span id="L293" class="LineNr"> 293 </span>    row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
<span id="L294" class="LineNr"> 294 </span>    <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> move-cursor <a href='../081print.mu.html#L16'>screen</a>, row, left
<span id="L295" class="LineNr"> 295 </span>    sandbox-data:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">data:offset</span>
<span id="L296" class="LineNr"> 296 </span>    row, <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L2107'>render-code</a> <a href='../081print.mu.html#L16'>screen</a>, sandbox-data, left, right, row
<span id="L297" class="LineNr"> 297 </span>    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">code-ending-row-on-screen:offset</span>, row
<span id="L298" class="LineNr"> 298 </span>    <span class="Comment"># render sandbox warnings, screen or response, in that order</span>
<span id="L299" class="LineNr"> 299 </span>    sandbox-response:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">response:offset</span>
<span id="L300" class="LineNr"> 300 </span><span class="Constant">    <a href='005-sandbox.mu.html#L300'>&lt;render-sandbox-results&gt;</a></span>
<span id="L301" class="LineNr"> 301 </span>    <span class="Delimiter">{</span>
<span id="L302" class="LineNr"> 302 </span>      sandbox-screen:&amp;:<a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> get *sandbox, <span class="Constant"><a href='../081print.mu.html#L16'>screen</a>:offset</span>
<span id="L303" class="LineNr"> 303 </span>      empty-screen?:bool <span class="Special">&lt;-</span> <a href='../081print.mu.html#L74'>fake-screen-is-empty?</a> sandbox-screen
<span id="L304" class="LineNr"> 304 </span>      <span class="muControl">break-if</span> empty-screen?
<span id="L305" class="LineNr"> 305 </span>      row, <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L507'>render-screen</a> <a href='../081print.mu.html#L16'>screen</a>, sandbox-screen, left, right, row
<span id="L306" class="LineNr"> 306 </span>    <span class="Delimiter">}</span>
<span id="L307" class="LineNr"> 307 </span>    <span class="Delimiter">{</span>
<span id="L308" class="LineNr"> 308 </span>      <span class="muControl">break-unless</span> empty-screen?
<span id="L309" class="LineNr"> 309 </span><span class="Constant">      <a href='005-sandbox.mu.html#L309'>&lt;render-sandbox-response&gt;</a></span>
<span id="L310" class="LineNr"> 310 </span>      row, <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L396'>render-text</a> <a href='../081print.mu.html#L16'>screen</a>, sandbox-response, left, right, <span class="Constant">245/grey</span>, row
<span id="L311" class="LineNr"> 311 </span>    <span class="Delimiter">}</span>
<span id="L312" class="LineNr"> 312 </span><span class="Constant">    +render-sandbox-end</span>
<span id="L313" class="LineNr"> 313 </span>    at-bottom?:bool <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L782'>screen-height</a>
<span id="L314" class="LineNr"> 314 </span>    <span class="muControl">return-if</span> at-bottom?
<span id="L315" class="LineNr"> 315 </span>    <span class="Comment"># draw solid line after sandbox</span>
<span id="L316" class="LineNr"> 316 </span>    <a href='002-typing.mu.html#L1114'>draw-horizontal</a> <a href='../081print.mu.html#L16'>screen</a>, row, left, right
<span id="L317" class="LineNr"> 317 </span>  <span class="Delimiter">}</span>
<span id="L318" class="LineNr"> 318 </span>  <span class="Comment"># if hidden, reset row attributes</span>
<span id="L319" class="LineNr"> 319 </span>  <span class="Delimiter">{</span>
<span id="L320" class="LineNr"> 320 </span>    <span class="muControl">break-unless</span> hidden?
<span id="L321" class="LineNr"> 321 </span>    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">starting-row-on-screen:offset</span>,<span class="Constant"> 0</span>
<span id="L322" class="LineNr"> 322 </span>    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">code-ending-row-on-screen:offset</span>,<span class="Constant"> 0</span>
<span id="L323" class="LineNr"> 323 </span><span class="Constant">    <a href='005-sandbox.mu.html#L323'>&lt;end-render-sandbox-reset-hidden&gt;</a></span>
<span id="L324" class="LineNr"> 324 </span>  <span class="Delimiter">}</span>
<span id="L325" class="LineNr"> 325 </span>  <span class="Comment"># draw next sandbox</span>
<span id="L326" class="LineNr"> 326 </span>  next-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">next-sandbox:offset</span>
<span id="L327" class="LineNr"> 327 </span>  next-idx:num <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
<span id="L328" class="LineNr"> 328 </span>  row, <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L276'>render-sandboxes</a> <a href='../081print.mu.html#L16'>screen</a>, next-sandbox, left, right, row, render-from, next-idx
<span id="L329" class="LineNr"> 329 </span>]
<span id="L330" class="LineNr"> 330 </span>
<span id="L331" class="LineNr"> 331 </span><span class="muRecipe">def</span> <a href='005-sandbox.mu.html#L331'>render-sandbox-menu</a> <a href='../081print.mu.html#L16'>screen</a>:&amp;:<a href='../081print.mu.html#L16'>screen</a>, sandbox-index:num, left:num, right:num<span class="muRecipe"> -&gt; </span><a href='../081print.mu.html#L16'>screen</a>:&amp;:<a href='../081print.mu.html#L16'>screen</a> [
<span id="L332" class="LineNr"> 332 </span>  <span class="Constant">local-scope</span>
<span id="L333" class="LineNr"> 333 </span>  <span class="Constant">load-inputs</span>
<span id="L334" class="LineNr"> 334 </span>  <a href='../081print.mu.html#L760'>move-cursor-to-column</a> <a href='../081print.mu.html#L16'>screen</a>, left
<span id="L335" class="LineNr"> 335 </span>  edit-button-left:num, edit-button-right:num, copy-button-left:num, copy-button-right:num, recipe-button-left:num, recipe-button-right:num, delete-button-left:num <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L376'>sandbox-menu-columns</a> left, right
<span id="L336" class="LineNr"> 336 </span>  print <a href='../081print.mu.html#L16'>screen</a>, sandbox-index, <span class="Constant">232/dark-grey</span>, <span class="Constant">245/grey</span>
<span id="L337" class="LineNr"> 337 </span>  start-buttons:num <span class="Special">&lt;-</span> subtract edit-button-left,<span class="Constant"> 1</span>
<span id="L338" class="LineNr"> 338 </span>  <a href='../081print.mu.html#L553'>clear-line-until</a> <a href='../081print.mu.html#L16'>screen</a>, start-buttons, <span class="Constant">245/grey</span>
<span id="L339" class="LineNr"> 339 </span>  print <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[edit]</span>, <span class="Constant">232/black</span>, <span class="Constant">25/background-blue</span>
<span id="L340" class="LineNr"> 340 </span>  <a href='../081print.mu.html#L553'>clear-line-until</a> <a href='../081print.mu.html#L16'>screen</a>, edit-button-right, <span class="Constant">25/background-blue</span>
<span id="L341" class="LineNr"> 341 </span>  print <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[copy]</span>, <span class="Constant">232/black</span>, <span class="Constant">58/background-green</span>
<span id="L342" class="LineNr"> 342 </span>  <a href='../081print.mu.html#L553'>clear-line-until</a> <a href='../081print.mu.html#L16'>screen</a>, copy-button-right, <span class="Constant">58/background-green</span>
<span id="L343" class="LineNr"> 343 </span>  print <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[to recipe]</span>, <span class="Constant">232/black</span>, <span class="Constant">94/background-orange</span>
<span id="L344" class="LineNr"> 344 </span>  <a href='../081print.mu.html#L553'>clear-line-until</a> <a href='../081print.mu.html#L16'>screen</a>, recipe-button-right, <span class="Constant">94/background-orange</span>
<span id="L345" class="LineNr"> 345 </span>  print <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[delete]</span>, <span class="Constant">232/black</span>, <span class="Constant">52/background-red</span>
<span id="L346" class="LineNr"> 346 </span>  <a href='../081print.mu.html#L553'>clear-line-until</a> <a href='../081print.mu.html#L16'>screen</a>, right, <span class="Constant">52/background-red</span>
<span id="L347" class="LineNr"> 347 </span>]
<span id="L348" class="LineNr"> 348 </span>
<span id="L349" class="LineNr"> 349 </span><span class="muScenario">scenario</span> skip-rendering-sandbox-menu-past-bottom-row [
<span id="L350" class="LineNr"> 350 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
<span id="L351" class="LineNr"> 351 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">6/height</span>
<span id="L352" class="LineNr"> 352 </span>  <span class="Comment"># recipe editor is empty</span>
<span id="L353" class="LineNr"> 353 </span>  assume-resources [
<span id="L354" class="LineNr"> 354 </span>    <span class="Constant">[lesson/0]</span> <span class="Special">&lt;-</span> <span class="Constant">[|add 2, 2|]</span>
<span id="L355" class="LineNr"> 355 </span>    <span class="Constant">[lesson/1]</span> <span class="Special">&lt;-</span> <span class="Constant">[|add 1, 1|]</span>
<span id="L356" class="LineNr"> 356 </span>  ]
<span id="L357" class="LineNr"> 357 </span>  <span class="Comment"># create two sandboxes such that the top one just barely fills the screen</span>
<span id="L358" class="LineNr"> 358 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[]</span>
<span id="L359" class="LineNr"> 359 </span>  env <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L473'>restore-sandboxes</a> env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L360" class="LineNr"> 360 </span>  run [
<span id="L361" class="LineNr"> 361 </span>    <a href='004-programming-environment.mu.html#L402'>render-all</a> <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L362" class="LineNr"> 362 </span>  ]
<span id="L363" class="LineNr"> 363 </span>  screen-should-contain [
<span id="L364" class="LineNr"> 364 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L365" class="LineNr"> 365 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L366" class="LineNr"> 366 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
<span id="L367" class="LineNr"> 367 </span>   <span class="Constant"> .                                                  ╎0   edit       copy       to recipe    delete    .</span>
<span id="L368" class="LineNr"> 368 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
<span id="L369" class="LineNr"> 369 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L370" class="LineNr"> 370 </span>  ]
<span id="L371" class="LineNr"> 371 </span>]
<span id="L372" class="LineNr"> 372 </span>
<span id="L373" class="LineNr"> 373 </span><span class="Comment"># divide up the menu bar for a sandbox into 3 segments, for edit/copy/delete buttons</span>
<span id="L374" class="LineNr"> 374 </span><span class="Comment"># delete-button-right == right</span>
<span id="L375" class="LineNr"> 375 </span><span class="Comment"># all left/right pairs are inclusive</span>
<span id="L376" class="LineNr"> 376 </span><span class="muRecipe">def</span> <a href='005-sandbox.mu.html#L376'>sandbox-menu-columns</a> left:num, right:num<span class="muRecipe"> -&gt; </span>edit-button-left:num, edit-button-right:num, copy-button-left:num, copy-button-right:num, recipe-button-left:num, recipe-button-right:num, delete-button-left:num [
<span id="L377" class="LineNr"> 377 </span>  <span class="Constant">local-scope</span>
<span id="L378" class="LineNr"> 378 </span>  <span class="Constant">load-inputs</span>
<span id="L379" class="LineNr"> 379 </span>  start-buttons:num <span class="Special">&lt;-</span> add left, <span class="Constant">4/space-for-sandbox-index</span>
<span id="L380" class="LineNr"> 380 </span>  buttons-space:num <span class="Special">&lt;-</span> subtract right, start-buttons
<span id="L381" class="LineNr"> 381 </span>  button-width:num <span class="Special">&lt;-</span> divide-with-remainder buttons-space,<span class="Constant"> 4</span>  <span class="Comment"># integer division</span>
<span id="L382" class="LineNr"> 382 </span>  buttons-wide-enough?:bool <span class="Special">&lt;-</span> greater-or-equal button-width,<span class="Constant"> 10</span>
<span id="L383" class="LineNr"> 383 </span>  assert buttons-wide-enough?, <span class="Constant">[sandbox must be at least 40 or so characters wide]</span>
<span id="L384" class="LineNr"> 384 </span>  edit-button-left:num <span class="Special">&lt;-</span> copy start-buttons
<span id="L385" class="LineNr"> 385 </span>  copy-button-left:num <span class="Special">&lt;-</span> add start-buttons, button-width
<span id="L386" class="LineNr"> 386 </span>  edit-button-right:num <span class="Special">&lt;-</span> subtract copy-button-left,<span class="Constant"> 1</span>
<span id="L387" class="LineNr"> 387 </span>  recipe-button-left:num <span class="Special">&lt;-</span> add copy-button-left, button-width
<span id="L388" class="LineNr"> 388 </span>  copy-button-right:num <span class="Special">&lt;-</span> subtract recipe-button-left,<span class="Constant"> 1</span>
<span id="L389" class="LineNr"> 389 </span>  delete-button-left:num <span class="Special">&lt;-</span> subtract right, button-width,<span class="Constant"> -2</span>  <span class="Comment"># because 'to recipe' is wider than 'delete'</span>
<span id="L390" class="LineNr"> 390 </span>  recipe-button-right:num <span class="Special">&lt;-</span> subtract delete-button-left,<span class="Constant"> 1</span>
<span id="L391" class="LineNr"> 391 </span>]
<span id="L392" class="LineNr"> 392 </span>
<span id="L393" class="LineNr"> 393 </span><span class="Comment"># print a text 's' to 'editor' in 'color' starting at 'row'</span>
<span id="L394" class="LineNr"> 394 </span><span class="Comment"># clear rest of last line, move cursor to next line</span>
<span id="L395" class="LineNr"> 395 </span><span class="Comment"># like 'render-code' but without syntax-based colorization</span>
<span id="L396" class="LineNr"> 396 </span><span class="muRecipe">def</span> <a href='005-sandbox.mu.html#L396'>render-text</a> <a href='../081print.mu.html#L16'>screen</a>:&amp;:<a href='../081print.mu.html#L16'>screen</a>, s:text, left:num, right:num, color:num, row:num<span class="muRecipe"> -&gt; </span>row:num, <a href='../081print.mu.html#L16'>screen</a>:&amp;:<a href='../081print.mu.html#L16'>screen</a> [
<span id="L397" class="LineNr"> 397 </span>  <span class="Constant">local-scope</span>
<span id="L398" class="LineNr"> 398 </span>  <span class="Constant">load-inputs</span>
<span id="L399" class="LineNr"> 399 </span>  <span class="muControl">return-unless</span> s
<span id="L400" class="LineNr"> 400 </span>  column:num <span class="Special">&lt;-</span> copy left
<span id="L401" class="LineNr"> 401 </span>  <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> move-cursor <a href='../081print.mu.html#L16'>screen</a>, row, column
<span id="L402" class="LineNr"> 402 </span>  <a href='../081print.mu.html#L782'>screen-height</a>:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L782'>screen-height</a> <a href='../081print.mu.html#L16'>screen</a>
<span id="L403" class="LineNr"> 403 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
<span id="L404" class="LineNr"> 404 </span>  len:num <span class="Special">&lt;-</span> length *s
<span id="L405" class="LineNr"> 405 </span>  <span class="Delimiter">{</span>
<span id="L406" class="LineNr"> 406 </span><span class="Constant">    +next-character</span>
<span id="L407" class="LineNr"> 407 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
<span id="L408" class="LineNr"> 408 </span>    <span class="muControl">break-if</span> done?
<span id="L409" class="LineNr"> 409 </span>    done? <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L782'>screen-height</a>
<span id="L410" class="LineNr"> 410 </span>    <span class="muControl">break-if</span> done?
<span id="L411" class="LineNr"> 411 </span>    c:char <span class="Special">&lt;-</span> index *s, i
<span id="L412" class="LineNr"> 412 </span>    <span class="Delimiter">{</span>
<span id="L413" class="LineNr"> 413 </span>      <span class="Comment"># newline? move to left rather than 0</span>
<span id="L414" class="LineNr"> 414 </span>      newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
<span id="L415" class="LineNr"> 415 </span>      <span class="muControl">break-unless</span> newline?
<span id="L416" class="LineNr"> 416 </span>      <span class="Comment"># clear rest of line in this window</span>
<span id="L417" class="LineNr"> 417 </span>      <span class="Delimiter">{</span>
<span id="L418" class="LineNr"> 418 </span>        done?:bool <span class="Special">&lt;-</span> greater-than column, right
<span id="L419" class="LineNr"> 419 </span>        <span class="muControl">break-if</span> done?
<span id="L420" class="LineNr"> 420 </span>        space:char <span class="Special">&lt;-</span> copy <span class="Constant">32/space</span>
<span id="L421" class="LineNr"> 421 </span>        print <a href='../081print.mu.html#L16'>screen</a>, space
<span id="L422" class="LineNr"> 422 </span>        column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
<span id="L423" class="LineNr"> 423 </span>       <span class="muControl"> loop</span>
<span id="L424" class="LineNr"> 424 </span>      <span class="Delimiter">}</span>
<span id="L425" class="LineNr"> 425 </span>      row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
<span id="L426" class="LineNr"> 426 </span>      column <span class="Special">&lt;-</span> copy left
<span id="L427" class="LineNr"> 427 </span>      <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> move-cursor <a href='../081print.mu.html#L16'>screen</a>, row, column
<span id="L428" class="LineNr"> 428 </span>      i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
<span id="L429" class="LineNr"> 429 </span>     <span class="muControl"> loop</span> <span class="Constant">+next-character</span>
<span id="L430" class="LineNr"> 430 </span>    <span class="Delimiter">}</span>
<span id="L431" class="LineNr"> 431 </span>    <span class="Delimiter">{</span>
<span id="L432" class="LineNr"> 432 </span>      <span class="Comment"># at right? wrap.</span>
<span id="L433" class="LineNr"> 433 </span>      at-right?:bool <span class="Special">&lt;-</span> equal column, right
<span id="L434" class="LineNr"> 434 </span>      <span class="muControl">break-unless</span> at-right?
<span id="L435" class="LineNr"> 435 </span>      <span class="Comment"># print wrap icon</span>
<span id="L436" class="LineNr"> 436 </span>      wrap-icon:char <span class="Special">&lt;-</span> copy <span class="Constant">8617/loop-back-to-left</span>
<span id="L437" class="LineNr"> 437 </span>      print <a href='../081print.mu.html#L16'>screen</a>, wrap-icon, <span class="Constant">245/grey</span>
<span id="L438" class="LineNr"> 438 </span>      column <span class="Special">&lt;-</span> copy left
<span id="L439" class="LineNr"> 439 </span>      row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
<span id="L440" class="LineNr"> 440 </span>      <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> move-cursor <a href='../081print.mu.html#L16'>screen</a>, row, column
<span id="L441" class="LineNr"> 441 </span>      <span class="Comment"># don't increment i</span>
<span id="L442" class="LineNr"> 442 </span>     <span class="muControl"> loop</span> <span class="Constant">+next-character</span>
<span id="L443" class="LineNr"> 443 </span>    <span class="Delimiter">}</span>
<span id="L444" class="LineNr"> 444 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
<span id="L445" class="LineNr"> 445 </span>    print <a href='../081print.mu.html#L16'>screen</a>, c, color
<span id="L446" class="LineNr"> 446 </span>    column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
<span id="L447" class="LineNr"> 447 </span>   <span class="muControl"> loop</span>
<span id="L448" class="LineNr"> 448 </span>  <span class="Delimiter">}</span>
<span id="L449" class="LineNr"> 449 </span>  was-at-left?:bool <span class="Special">&lt;-</span> equal column, left
<span id="L450" class="LineNr"> 450 </span>  <a href='../081print.mu.html#L553'>clear-line-until</a> <a href='../081print.mu.html#L16'>screen</a>, right
<span id="L451" class="LineNr"> 451 </span>  <span class="Delimiter">{</span>
<span id="L452" class="LineNr"> 452 </span>    <span class="muControl">break-if</span> was-at-left?
<span id="L453" class="LineNr"> 453 </span>    row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
<span id="L454" class="LineNr"> 454 </span>  <span class="Delimiter">}</span>
<span id="L455" class="LineNr"> 455 </span>  move-cursor <a href='../081print.mu.html#L16'>screen</a>, row, left
<span id="L456" class="LineNr"> 456 </span>]
<span id="L457" class="LineNr"> 457 </span>
<span id="L458" class="LineNr"> 458 </span><span class="muScenario">scenario</span> render-text-wraps-barely-long-lines [
<span id="L459" class="LineNr"> 459 </span>  <span class="Constant">local-scope</span>
<span id="L460" class="LineNr"> 460 </span>  assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
<span id="L461" class="LineNr"> 461 </span>  run [
<span id="L462" class="LineNr"> 462 </span>    <a href='005-sandbox.mu.html#L396'>render-text</a> <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[abcde]</span>, <span class="Constant">0/left</span>, <span class="Constant">4/right</span>, <span class="Constant">7/white</span>, <span class="Constant">1/row</span>
<span id="L463" class="LineNr"> 463 </span>  ]
<span id="L464" class="LineNr"> 464 </span>  screen-should-contain [
<span id="L465" class="LineNr"> 465 </span>   <span class="Constant"> .     .</span>
<span id="L466" class="LineNr"> 466 </span><span class="Constant">    .abcd↩.</span>
<span id="L467" class="LineNr"> 467 </span>   <span class="Constant"> .e    .</span>
<span id="L468" class="LineNr"> 468 </span>   <span class="Constant"> .     .</span>
<span id="L469" class="LineNr"> 469 </span>  ]
<span id="L470" class="LineNr"> 470 </span>]
<span id="L471" class="LineNr"> 471 </span>
<span id="L472" class="LineNr"> 472 </span><span class="Comment"># assumes programming environment has no sandboxes; restores them from previous session</span>
<span id="L473" class="LineNr"> 473 </span><span class="muRecipe">def</span> <a href='005-sandbox.mu.html#L473'>restore-sandboxes</a> env:&amp;:environment, <a href='../088file.mu.html#L11'>resources</a>:&amp;:<a href='../088file.mu.html#L11'>resources</a><span class="muRecipe"> -&gt; </span>env:&amp;:environment [
<span id="L474" class="LineNr"> 474 </span>  <span class="Constant">local-scope</span>
<span id="L475" class="LineNr"> 475 </span>  <span class="Constant">load-inputs</span>
<span id="L476" class="LineNr"> 476 </span>  <span class="Comment"># read all scenarios, pushing them to end of a list of scenarios</span>
<span id="L477" class="LineNr"> 477 </span>  idx:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
<span id="L478" class="LineNr"> 478 </span>  curr:&amp;:sandbox <span class="Special">&lt;-</span> copy<span class="Constant"> null</span>
<span id="L479" class="LineNr"> 479 </span>  <a href='../065duplex_list.mu.html#L38'>prev</a>:&amp;:sandbox <span class="Special">&lt;-</span> copy<span class="Constant"> null</span>
<span id="L480" class="LineNr"> 480 </span>  <span class="Delimiter">{</span>
<span id="L481" class="LineNr"> 481 </span>    filename:text <span class="Special">&lt;-</span> append <span class="Constant">[lesson/]</span>, idx
<span id="L482" class="LineNr"> 482 </span>    contents:text <span class="Special">&lt;-</span> <a href='../088file.mu.html#L38'>slurp</a> <a href='../088file.mu.html#L11'>resources</a>, filename
<span id="L483" class="LineNr"> 483 </span>    <span class="muControl">break-unless</span> contents  <span class="Comment"># stop at first error; assuming file didn't exist</span>
<span id="L484" class="LineNr"> 484 </span>                           <span class="Comment"># todo: handle empty sandbox</span>
<span id="L485" class="LineNr"> 485 </span>    <span class="Comment"># create new sandbox for file</span>
<span id="L486" class="LineNr"> 486 </span>    curr <span class="Special">&lt;-</span> new <span class="Constant">sandbox:type</span>
<span id="L487" class="LineNr"> 487 </span>    *curr <span class="Special">&lt;-</span> put *curr, <span class="Constant">data:offset</span>, contents
<span id="L488" class="LineNr"> 488 </span><span class="Constant">    <a href='005-sandbox.mu.html#L488'>&lt;end-restore-sandbox&gt;</a></span>
<span id="L489" class="LineNr"> 489 </span>    <span class="Delimiter">{</span>
<span id="L490" class="LineNr"> 490 </span>      <span class="muControl">break-if</span> idx
<span id="L491" class="LineNr"> 491 </span>      *env <span class="Special">&lt;-</span> put *env, <span class="Constant">sandbox:offset</span>, curr
<span id="L492" class="LineNr"> 492 </span>    <span class="Delimiter">}</span>
<span id="L493" class="LineNr"> 493 </span>    <span class="Delimiter">{</span>
<span id="L494" class="LineNr"> 494 </span>      <span class="muControl">break-unless</span> idx
<span id="L495" class="LineNr"> 495 </span>      *prev <span class="Special">&lt;-</span> put *prev, <span class="Constant">next-sandbox:offset</span>, curr
<span id="L496" class="LineNr"> 496 </span>    <span class="Delimiter">}</span>
<span id="L497" class="LineNr"> 497 </span>    idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
<span id="L498" class="LineNr"> 498 </span>    <a href='../065duplex_list.mu.html#L38'>prev</a> <span class="Special">&lt;-</span> copy curr
<span id="L499" class="LineNr"> 499 </span>   <span class="muControl"> loop</span>
<span id="L500" class="LineNr"> 500 </span>  <span class="Delimiter">}</span>
<span id="L501" class="LineNr"> 501 </span>  <span class="Comment"># update sandbox count</span>
<span id="L502" class="LineNr"> 502 </span>  *env <span class="Special">&lt;-</span> put *env, <span class="Constant">number-of-sandboxes:offset</span>, idx
<span id="L503" class="LineNr"> 503 </span>]
<span id="L504" class="LineNr"> 504 </span>
<span id="L505" class="LineNr"> 505 </span><span class="Comment"># print the fake sandbox screen to 'screen' with appropriate delimiters</span>
<span id="L506" class="LineNr"> 506 </span><span class="Comment"># leave cursor at start of next line</span>
<span id="L507" class="LineNr"> 507 </span><span class="muRecipe">def</span> <a href='005-sandbox.mu.html#L507'>render-screen</a> <a href='../081print.mu.html#L16'>screen</a>:&amp;:<a href='../081print.mu.html#L16'>screen</a>, sandbox-screen:&amp;:<a href='../081print.mu.html#L16'>screen</a>, left:num, right:num, row:num<span class="muRecipe"> -&gt; </span>row:num, <a href='../081print.mu.html#L16'>screen</a>:&amp;:<a href='../081print.mu.html#L16'>screen</a> [
<span id="L508" class="LineNr"> 508 </span>  <span class="Constant">local-scope</span>
<span id="L509" class="LineNr"> 509 </span>  <span class="Constant">load-inputs</span>
<span id="L510" class="LineNr"> 510 </span>  <span class="muControl">return-unless</span> sandbox-screen
<span id="L511" class="LineNr"> 511 </span>  <span class="Comment"># print 'screen:'</span>
<span id="L512" class="LineNr"> 512 </span>  row <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L396'>render-text</a> <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[screen:]</span>, left, right, <span class="Constant">245/grey</span>, row
<span id="L513" class="LineNr"> 513 </span>  <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> move-cursor <a href='../081print.mu.html#L16'>screen</a>, row, left
<span id="L514" class="LineNr"> 514 </span>  <span class="Comment"># start printing sandbox-screen</span>
<span id="L515" class="LineNr"> 515 </span>  column:num <span class="Special">&lt;-</span> copy left
<span id="L516" class="LineNr"> 516 </span>  s-width:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L768'>screen-width</a> sandbox-screen
<span id="L517" class="LineNr"> 517 </span>  s-height:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L782'>screen-height</a> sandbox-screen
<span id="L518" class="LineNr"> 518 </span>  buf:&amp;:@:<a href='../081print.mu.html#L27'>screen-cell</a> <span class="Special">&lt;-</span> get *sandbox-screen, <span class="Constant">data:offset</span>
<span id="L519" class="LineNr"> 519 </span>  stop-printing:num <span class="Special">&lt;-</span> add left, s-width,<span class="Constant"> 3</span>
<span id="L520" class="LineNr"> 520 </span>  max-column:num <span class="Special">&lt;-</span> min stop-printing, right
<span id="L521" class="LineNr"> 521 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
<span id="L522" class="LineNr"> 522 </span>  len:num <span class="Special">&lt;-</span> length *buf
<span id="L523" class="LineNr"> 523 </span>  <a href='../081print.mu.html#L782'>screen-height</a>:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L782'>screen-height</a> <a href='../081print.mu.html#L16'>screen</a>
<span id="L524" class="LineNr"> 524 </span>  <span class="Delimiter">{</span>
<span id="L525" class="LineNr"> 525 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
<span id="L526" class="LineNr"> 526 </span>    <span class="muControl">break-if</span> done?
<span id="L527" class="LineNr"> 527 </span>    done? <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L782'>screen-height</a>
<span id="L528" class="LineNr"> 528 </span>    <span class="muControl">break-if</span> done?
<span id="L529" class="LineNr"> 529 </span>    column <span class="Special">&lt;-</span> copy left
<span id="L530" class="LineNr"> 530 </span>    <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> move-cursor <a href='../081print.mu.html#L16'>screen</a>, row, column
<span id="L531" class="LineNr"> 531 </span>    <span class="Comment"># initial leader for each row: two spaces and a '.'</span>
<span id="L532" class="LineNr"> 532 </span>    space:char <span class="Special">&lt;-</span> copy <span class="Constant">32/space</span>
<span id="L533" class="LineNr"> 533 </span>    print <a href='../081print.mu.html#L16'>screen</a>, space, <span class="Constant">245/grey</span>
<span id="L534" class="LineNr"> 534 </span>    print <a href='../081print.mu.html#L16'>screen</a>, space, <span class="Constant">245/grey</span>
<span id="L535" class="LineNr"> 535 </span>    full-stop:char <span class="Special">&lt;-</span> copy <span class="Constant">46/period</span>
<span id="L536" class="LineNr"> 536 </span>    print <a href='../081print.mu.html#L16'>screen</a>, full-stop, <span class="Constant">245/grey</span>
<span id="L537" class="LineNr"> 537 </span>    column <span class="Special">&lt;-</span> add left,<span class="Constant"> 3</span>
<span id="L538" class="LineNr"> 538 </span>    <span class="Delimiter">{</span>
<span id="L539" class="LineNr"> 539 </span>      <span class="Comment"># print row</span>
<span id="L540" class="LineNr"> 540 </span>      row-done?:bool <span class="Special">&lt;-</span> greater-or-equal column, max-column
<span id="L541" class="LineNr"> 541 </span>      <span class="muControl">break-if</span> row-done?
<span id="L542" class="LineNr"> 542 </span>      curr:<a href='../081print.mu.html#L27'>screen-cell</a> <span class="Special">&lt;-</span> index *buf, i
<span id="L543" class="LineNr"> 543 </span>      c:char <span class="Special">&lt;-</span> get curr, <span class="Constant">contents:offset</span>
<span id="L544" class="LineNr"> 544 </span>      color:num <span class="Special">&lt;-</span> get curr, <span class="Constant">color:offset</span>
<span id="L545" class="LineNr"> 545 </span>      <span class="Delimiter">{</span>
<span id="L546" class="LineNr"> 546 </span>        <span class="Comment"># damp whites down to grey</span>
<span id="L547" class="LineNr"> 547 </span>        white?:bool <span class="Special">&lt;-</span> equal color, <span class="Constant">7/white</span>
<span id="L548" class="LineNr"> 548 </span>        <span class="muControl">break-unless</span> white?
<span id="L549" class="LineNr"> 549 </span>        color <span class="Special">&lt;-</span> copy <span class="Constant">245/grey</span>
<span id="L550" class="LineNr"> 550 </span>      <span class="Delimiter">}</span>
<span id="L551" class="LineNr"> 551 </span>      print <a href='../081print.mu.html#L16'>screen</a>, c, color
<span id="L552" class="LineNr"> 552 </span>      column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
<span id="L553" class="LineNr"> 553 </span>      i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
<span id="L554" class="LineNr"> 554 </span>     <span class="muControl"> loop</span>
<span id="L555" class="LineNr"> 555 </span>    <span class="Delimiter">}</span>
<span id="L556" class="LineNr"> 556 </span>    <span class="Comment"># print final '.'</span>
<span id="L557" class="LineNr"> 557 </span>    print <a href='../081print.mu.html#L16'>screen</a>, full-stop, <span class="Constant">245/grey</span>
<span id="L558" class="LineNr"> 558 </span>    column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
<span id="L559" class="LineNr"> 559 </span>    <span class="Delimiter">{</span>
<span id="L560" class="LineNr"> 560 </span>      <span class="Comment"># clear rest of current line</span>
<span id="L561" class="LineNr"> 561 </span>      line-done?:bool <span class="Special">&lt;-</span> greater-than column, right
<span id="L562" class="LineNr"> 562 </span>      <span class="muControl">break-if</span> line-done?
<span id="L563" class="LineNr"> 563 </span>      print <a href='../081print.mu.html#L16'>screen</a>, space
<span id="L564" class="LineNr"> 564 </span>      column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
<span id="L565" class="LineNr"> 565 </span>     <span class="muControl"> loop</span>
<span id="L566" class="LineNr"> 566 </span>    <span class="Delimiter">}</span>
<span id="L567" class="LineNr"> 567 </span>    row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
<span id="L568" class="LineNr"> 568 </span>   <span class="muControl"> loop</span>
<span id="L569" class="LineNr"> 569 </span>  <span class="Delimiter">}</span>
<span id="L570" class="LineNr"> 570 </span>]
<span id="L571" class="LineNr"> 571 </span>
<span id="L572" class="LineNr"> 572 </span><span class="muScenario">scenario</span> run-updates-results [
<span id="L573" class="LineNr"> 573 </span>  <span class="Constant">local-scope</span>
<span id="L574" class="LineNr"> 574 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
<span id="L575" class="LineNr"> 575 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">12/height</span>
<span id="L576" class="LineNr"> 576 </span>  <span class="Comment"># define a recipe (no indent for the 'add' line below so column numbers are more obvious)</span>
<span id="L577" class="LineNr"> 577 </span>  assume-resources [
<span id="L578" class="LineNr"> 578 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
<span id="L579" class="LineNr"> 579 </span><span class="Constant">      ||</span>
<span id="L580" class="LineNr"> 580 </span>      <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
<span id="L581" class="LineNr"> 581 </span><span class="Constant">      |  local-scope|</span>
<span id="L582" class="LineNr"> 582 </span><span class="Constant">      |  z:num &lt;- add 2, 2|</span>
<span id="L583" class="LineNr"> 583 </span><span class="Constant">      |  reply z|</span>
<span id="L584" class="LineNr"> 584 </span><span class="Constant">      |]</span>|
<span id="L585" class="LineNr"> 585 </span>    ]
<span id="L586" class="LineNr"> 586 </span>  ]
<span id="L587" class="LineNr"> 587 </span>  <span class="Comment"># sandbox editor contains an instruction without storing outputs</span>
<span id="L588" class="LineNr"> 588 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[foo]</span>  <span class="Comment"># contents of sandbox editor</span>
<span id="L589" class="LineNr"> 589 </span>  <a href='004-programming-environment.mu.html#L402'>render-all</a> <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L590" class="LineNr"> 590 </span>  $clear-trace
<span id="L591" class="LineNr"> 591 </span>  <span class="Comment"># run the code in the editors</span>
<span id="L592" class="LineNr"> 592 </span>  assume-console [
<span id="L593" class="LineNr"> 593 </span>    press F4
<span id="L594" class="LineNr"> 594 </span>  ]
<span id="L595" class="LineNr"> 595 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L596" class="LineNr"> 596 </span>  screen-should-contain [
<span id="L597" class="LineNr"> 597 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L598" class="LineNr"> 598 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L599" class="LineNr"> 599 </span>   <span class="Constant"> .recipe foo [                                      ╎─────────────────────────────────────────────────.</span>
<span id="L600" class="LineNr"> 600 </span>   <span class="Constant"> .  local-scope                                     ╎0   edit       copy       to recipe    delete    .</span>
<span id="L601" class="LineNr"> 601 </span>   <span class="Constant"> .  z:num &lt;- add 2, 2                               ╎foo                                              .</span>
<span id="L602" class="LineNr"> 602 </span>   <span class="Constant"> .  reply z                                         ╎4                                                .</span>
<span id="L603" class="LineNr"> 603 </span>   <span class="Constant"> .]                                                 ╎─────────────────────────────────────────────────.</span>
<span id="L604" class="LineNr"> 604 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L605" class="LineNr"> 605 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
<span id="L606" class="LineNr"> 606 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L607" class="LineNr"> 607 </span>  ]
<span id="L608" class="LineNr"> 608 </span>  <span class="Comment"># the new sandbox should be saved to disk</span>
<span id="L609" class="LineNr"> 609 </span>  trace-should-contain [
<span id="L610" class="LineNr"> 610 </span>    app: save sandboxes
<span id="L611" class="LineNr"> 611 </span>  ]
<span id="L612" class="LineNr"> 612 </span>  <span class="Comment"># no need to update editor</span>
<span id="L613" class="LineNr"> 613 </span>  trace-should-not-contain [
<span id="L614" class="LineNr"> 614 </span>    app: <a href='001-editor.mu.html#L109'>render</a> recipes
<span id="L615" class="LineNr"> 615 </span>  ]
<span id="L616" class="LineNr"> 616 </span>  <span class="Comment"># make a change (incrementing one of the args to 'add'), then rerun</span>
<span id="L617" class="LineNr"> 617 </span>  $clear-trace
<span id="L618" class="LineNr"> 618 </span>  assume-console [
<span id="L619" class="LineNr"> 619 </span>    left-click<span class="Constant"> 4</span>,<span class="Constant"> 28</span>  <span class="Comment"># one past the value of the second arg</span>
<span id="L620" class="LineNr"> 620 </span>    press backspace
<span id="L621" class="LineNr"> 621 </span>    type <span class="Constant">[3]</span>
<span id="L622" class="LineNr"> 622 </span>    press F4
<span id="L623" class="LineNr"> 623 </span>  ]
<span id="L624" class="LineNr"> 624 </span>  run [
<span id="L625" class="LineNr"> 625 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L626" class="LineNr"> 626 </span>  ]
<span id="L627" class="LineNr"> 627 </span>  <span class="Comment"># check that screen updates the result on the right</span>
<span id="L628" class="LineNr"> 628 </span>  screen-should-contain [
<span id="L629" class="LineNr"> 629 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L630" class="LineNr"> 630 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L631" class="LineNr"> 631 </span>   <span class="Constant"> .recipe foo [                                      ╎─────────────────────────────────────────────────.</span>
<span id="L632" class="LineNr"> 632 </span>   <span class="Constant"> .  local-scope                                     ╎0   edit       copy       to recipe    delete    .</span>
<span id="L633" class="LineNr"> 633 </span>   <span class="Constant"> .  z:num &lt;- add 2, 3                               ╎foo                                              .</span>
<span id="L634" class="LineNr"> 634 </span>   <span class="Constant"> .  reply z                                         ╎5                                                .</span>
<span id="L635" class="LineNr"> 635 </span>   <span class="Constant"> .]                                                 ╎─────────────────────────────────────────────────.</span>
<span id="L636" class="LineNr"> 636 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L637" class="LineNr"> 637 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
<span id="L638" class="LineNr"> 638 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L639" class="LineNr"> 639 </span>  ]
<span id="L640" class="LineNr"> 640 </span>  <span class="Comment"># no need to save sandboxes all over again</span>
<span id="L641" class="LineNr"> 641 </span>  trace-should-not-contain [
<span id="L642" class="LineNr"> 642 </span>    app: save sandboxes
<span id="L643" class="LineNr"> 643 </span>  ]
<span id="L644" class="LineNr"> 644 </span>]
<span id="L645" class="LineNr"> 645 </span>
<span id="L646" class="LineNr"> 646 </span><span class="muScenario">scenario</span> run-instruction-manages-screen-per-sandbox [
<span id="L647" class="LineNr"> 647 </span>  <span class="Constant">local-scope</span>
<span id="L648" class="LineNr"> 648 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
<span id="L649" class="LineNr"> 649 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">20/height</span>
<span id="L650" class="LineNr"> 650 </span>  <span class="Comment"># empty recipes</span>
<span id="L651" class="LineNr"> 651 </span>  assume-resources [
<span id="L652" class="LineNr"> 652 </span>  ]
<span id="L653" class="LineNr"> 653 </span>  <span class="Comment"># sandbox editor contains an instruction</span>
<span id="L654" class="LineNr"> 654 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[print <a href='../081print.mu.html#L16'>screen</a>, 4]</span>  <span class="Comment"># contents of sandbox editor</span>
<span id="L655" class="LineNr"> 655 </span>  <a href='004-programming-environment.mu.html#L402'>render-all</a> <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L656" class="LineNr"> 656 </span>  <span class="Comment"># run the code in the editor</span>
<span id="L657" class="LineNr"> 657 </span>  assume-console [
<span id="L658" class="LineNr"> 658 </span>    press F4
<span id="L659" class="LineNr"> 659 </span>  ]
<span id="L660" class="LineNr"> 660 </span>  run [
<span id="L661" class="LineNr"> 661 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L662" class="LineNr"> 662 </span>  ]
<span id="L663" class="LineNr"> 663 </span>  <span class="Comment"># check that it prints a little toy screen</span>
<span id="L664" class="LineNr"> 664 </span>  screen-should-contain [
<span id="L665" class="LineNr"> 665 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L666" class="LineNr"> 666 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L667" class="LineNr"> 667 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
<span id="L668" class="LineNr"> 668 </span>   <span class="Constant"> .                                                  ╎0   edit       copy       to recipe    delete    .</span>
<span id="L669" class="LineNr"> 669 </span>   <span class="Constant"> .                                                  ╎print <a href='../081print.mu.html#L16'>screen</a>, 4                                  .</span>
<span id="L670" class="LineNr"> 670 </span>   <span class="Constant"> .                                                  ╎screen:                                          .</span>
<span id="L671" class="LineNr"> 671 </span>   <span class="Constant"> .                                                  ╎  .4                             .               .</span>
<span id="L672" class="LineNr"> 672 </span>   <span class="Constant"> .                                                  ╎  .                              .               .</span>
<span id="L673" class="LineNr"> 673 </span>   <span class="Constant"> .                                                  ╎  .                              .               .</span>
<span id="L674" class="LineNr"> 674 </span>   <span class="Constant"> .                                                  ╎  .                              .               .</span>
<span id="L675" class="LineNr"> 675 </span>   <span class="Constant"> .                                                  ╎  .                              .               .</span>
<span id="L676" class="LineNr"> 676 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L677" class="LineNr"> 677 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L678" class="LineNr"> 678 </span>  ]
<span id="L679" class="LineNr"> 679 </span>]
<span id="L680" class="LineNr"> 680 </span>
<span id="L681" class="LineNr"> 681 </span><span class="muRecipe">def</span> <a href='005-sandbox.mu.html#L681'>editor-contents</a> editor:&amp;:editor<span class="muRecipe"> -&gt; </span>result:text [
<span id="L682" class="LineNr"> 682 </span>  <span class="Constant">local-scope</span>
<span id="L683" class="LineNr"> 683 </span>  <span class="Constant">load-inputs</span>
<span id="L684" class="LineNr"> 684 </span>  buf:&amp;:<a href='../061text.mu.html#L120'>buffer</a>:char <span class="Special">&lt;-</span> <a href='../061text.mu.html#L125'>new-buffer</a><span class="Constant"> 80</span>
<span id="L685" class="LineNr"> 685 </span>  curr:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">data:offset</span>
<span id="L686" class="LineNr"> 686 </span>  <span class="Comment"># skip § sentinel</span>
<span id="L687" class="LineNr"> 687 </span>  assert curr, <span class="Constant">[editor without data is illegal; must have at least a sentinel]</span>
<span id="L688" class="LineNr"> 688 </span>  curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L31'>next</a> curr
<span id="L689" class="LineNr"> 689 </span>  <span class="muControl">return-unless</span> curr,<span class="Constant"> null</span>
<span id="L690" class="LineNr"> 690 </span>  <span class="Delimiter">{</span>
<span id="L691" class="LineNr"> 691 </span>    <span class="muControl">break-unless</span> curr
<span id="L692" class="LineNr"> 692 </span>    c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
<span id="L693" class="LineNr"> 693 </span>    buf <span class="Special">&lt;-</span> append buf, c
<span id="L694" class="LineNr"> 694 </span>    curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L31'>next</a> curr
<span id="L695" class="LineNr"> 695 </span>   <span class="muControl"> loop</span>
<span id="L696" class="LineNr"> 696 </span>  <span class="Delimiter">}</span>
<span id="L697" class="LineNr"> 697 </span>  result <span class="Special">&lt;-</span> <a href='../061text.mu.html#L338'>buffer-to-array</a> buf
<span id="L698" class="LineNr"> 698 </span>]
<span id="L699" class="LineNr"> 699 </span>
<span id="L700" class="LineNr"> 700 </span><span class="muScenario">scenario</span> editor-provides-edited-contents [
<span id="L701" class="LineNr"> 701 </span>  <span class="Constant">local-scope</span>
<span id="L702" class="LineNr"> 702 </span>  assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
<span id="L703" class="LineNr"> 703 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L51'>new-editor</a> <span class="Constant">[abc]</span>, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
<span id="L704" class="LineNr"> 704 </span>  assume-console [
<span id="L705" class="LineNr"> 705 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
<span id="L706" class="LineNr"> 706 </span>    type <span class="Constant">[def]</span>
<span id="L707" class="LineNr"> 707 </span>  ]
<span id="L708" class="LineNr"> 708 </span>  run [
<span id="L709" class="LineNr"> 709 </span>    <a href='002-typing.mu.html#L16'>editor-event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
<span id="L710" class="LineNr"> 710 </span>    s:text <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L681'>editor-contents</a> e
<span id="L711" class="LineNr"> 711 </span>    1:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s
<span id="L712" class="LineNr"> 712 </span>  ]
<span id="L713" class="LineNr"> 713 </span>  memory-should-contain [
<span id="L714" class="LineNr"> 714 </span>    1:array:character <span class="Special">&lt;-</span> <span class="Constant">[abdefc]</span>
<span id="L715" class="LineNr"> 715 </span>  ]
<span id="L716" class="LineNr"> 716 </span>]
<span id="L717" class="LineNr"> 717 </span>
<span id="L718" class="LineNr"> 718 </span><span class="Comment"># keep the bottom of recipes from scrolling off the screen</span>
<span id="L719" class="LineNr"> 719 </span>
<span id="L720" class="LineNr"> 720 </span><span class="muScenario">scenario</span> scrolling-down-past-bottom-of-recipe-editor [
<span id="L721" class="LineNr"> 721 </span>  <span class="Constant">local-scope</span>
<span id="L722" class="LineNr"> 722 </span>  trace-until <span class="Constant">100/app</span>
<span id="L723" class="LineNr"> 723 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
<span id="L724" class="LineNr"> 724 </span>  assume-resources [
<span id="L725" class="LineNr"> 725 </span>  ]
<span id="L726" class="LineNr"> 726 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[]</span>
<span id="L727" class="LineNr"> 727 </span>  <a href='004-programming-environment.mu.html#L402'>render-all</a> <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L728" class="LineNr"> 728 </span>  assume-console [
<span id="L729" class="LineNr"> 729 </span>    press enter
<span id="L730" class="LineNr"> 730 </span>    press down-arrow
<span id="L731" class="LineNr"> 731 </span>  ]
<span id="L732" class="LineNr"> 732 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L733" class="LineNr"> 733 </span>  <span class="Comment"># no scroll</span>
<span id="L734" class="LineNr"> 734 </span>  screen-should-contain [
<span id="L735" class="LineNr"> 735 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L736" class="LineNr"> 736 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L737" class="LineNr"> 737 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L738" class="LineNr"> 738 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
<span id="L739" class="LineNr"> 739 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L740" class="LineNr"> 740 </span>  ]
<span id="L741" class="LineNr"> 741 </span>]
<span id="L742" class="LineNr"> 742 </span>
<span id="L743" class="LineNr"> 743 </span><span class="muScenario">scenario</span> cursor-down-in-recipe-editor [
<span id="L744" class="LineNr"> 744 </span>  <span class="Constant">local-scope</span>
<span id="L745" class="LineNr"> 745 </span>  trace-until <span class="Constant">100/app</span>
<span id="L746" class="LineNr"> 746 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
<span id="L747" class="LineNr"> 747 </span>  assume-resources [
<span id="L748" class="LineNr"> 748 </span>  ]
<span id="L749" class="LineNr"> 749 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[]</span>
<span id="L750" class="LineNr"> 750 </span>  <a href='004-programming-environment.mu.html#L402'>render-all</a> <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L751" class="LineNr"> 751 </span>  assume-console [
<span id="L752" class="LineNr"> 752 </span>    press enter
<span id="L753" class="LineNr"> 753 </span>    press up-arrow
<span id="L754" class="LineNr"> 754 </span>    press down-arrow  <span class="Comment"># while cursor isn't at bottom</span>
<span id="L755" class="LineNr"> 755 </span>  ]
<span id="L756" class="LineNr"> 756 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L757" class="LineNr"> 757 </span>  cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
<span id="L758" class="LineNr"> 758 </span>  print <a href='../081print.mu.html#L16'>screen</a>, cursor
<span id="L759" class="LineNr"> 759 </span>  <span class="Comment"># cursor moves back to bottom</span>
<span id="L760" class="LineNr"> 760 </span>  screen-should-contain [
<span id="L761" class="LineNr"> 761 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L762" class="LineNr"> 762 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L763" class="LineNr"> 763 </span>   <span class="Constant"> .␣                                                 ╎─────────────────────────────────────────────────.</span>
<span id="L764" class="LineNr"> 764 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
<span id="L765" class="LineNr"> 765 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L766" class="LineNr"> 766 </span>  ]
<span id="L767" class="LineNr"> 767 </span>]
<span id="L768" class="LineNr"> 768 </span>
<span id="L769" class="LineNr"> 769 </span><span class="muScenario">scenario</span> scrolling-down-past-bottom-of-recipe-editor-2 [
<span id="L770" class="LineNr"> 770 </span>  <span class="Constant">local-scope</span>
<span id="L771" class="LineNr"> 771 </span>  trace-until <span class="Constant">100/app</span>
<span id="L772" class="LineNr"> 772 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
<span id="L773" class="LineNr"> 773 </span>  assume-resources [
<span id="L774" class="LineNr"> 774 </span>  ]
<span id="L775" class="LineNr"> 775 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[]</span>
<span id="L776" class="LineNr"> 776 </span>  <a href='004-programming-environment.mu.html#L402'>render-all</a> <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L777" class="LineNr"> 777 </span>  assume-console [
<span id="L778" class="LineNr"> 778 </span>    <span class="Comment"># add a line</span>
<span id="L779" class="LineNr"> 779 </span>    press enter
<span id="L780" class="LineNr"> 780 </span>    <span class="Comment"># cursor back to top line</span>
<span id="L781" class="LineNr"> 781 </span>    press up-arrow
<span id="L782" class="LineNr"> 782 </span>    <span class="Comment"># try to scroll</span>
<span id="L783" class="LineNr"> 783 </span>    press <a href='003-shortcuts.mu.html#L3610'>page-down</a>  <span class="Comment"># or ctrl-f</span>
<span id="L784" class="LineNr"> 784 </span>  ]
<span id="L785" class="LineNr"> 785 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L786" class="LineNr"> 786 </span>  <span class="Comment"># no scroll, and cursor remains at top line</span>
<span id="L787" class="LineNr"> 787 </span>  screen-should-contain [
<span id="L788" class="LineNr"> 788 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L789" class="LineNr"> 789 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L790" class="LineNr"> 790 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L791" class="LineNr"> 791 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
<span id="L792" class="LineNr"> 792 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L793" class="LineNr"> 793 </span>  ]
<span id="L794" class="LineNr"> 794 </span>]
<span id="L795" class="LineNr"> 795 </span>
<span id="L796" class="LineNr"> 796 </span><span class="muScenario">scenario</span> scrolling-down-past-bottom-of-recipe-editor-3 [
<span id="L797" class="LineNr"> 797 </span>  <span class="Constant">local-scope</span>
<span id="L798" class="LineNr"> 798 </span>  trace-until <span class="Constant">100/app</span>
<span id="L799" class="LineNr"> 799 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
<span id="L800" class="LineNr"> 800 </span>  assume-resources [
<span id="L801" class="LineNr"> 801 </span>  ]
<span id="L802" class="LineNr"> 802 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[ab</span>
<span id="L803" class="LineNr"> 803 </span><span class="Constant">cd]</span>
<span id="L804" class="LineNr"> 804 </span>  <a href='004-programming-environment.mu.html#L402'>render-all</a> <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L805" class="LineNr"> 805 </span>  assume-console [
<span id="L806" class="LineNr"> 806 </span>    <span class="Comment"># add a line</span>
<span id="L807" class="LineNr"> 807 </span>    press enter
<span id="L808" class="LineNr"> 808 </span>    <span class="Comment"># switch to sandbox</span>
<span id="L809" class="LineNr"> 809 </span>    press ctrl-n
<span id="L810" class="LineNr"> 810 </span>    <span class="Comment"># move cursor</span>
<span id="L811" class="LineNr"> 811 </span>    press down-arrow
<span id="L812" class="LineNr"> 812 </span>  ]
<span id="L813" class="LineNr"> 813 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L814" class="LineNr"> 814 </span>  cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
<span id="L815" class="LineNr"> 815 </span>  print <a href='../081print.mu.html#L16'>screen</a>, cursor
<span id="L816" class="LineNr"> 816 </span>  <span class="Comment"># no scroll on recipe side, cursor moves on sandbox side</span>
<span id="L817" class="LineNr"> 817 </span>  screen-should-contain [
<span id="L818" class="LineNr"> 818 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L819" class="LineNr"> 819 </span>   <span class="Constant"> .                                                  ╎ab                                               .</span>
<span id="L820" class="LineNr"> 820 </span>   <span class="Constant"> .                                                  ╎␣d                                               .</span>
<span id="L821" class="LineNr"> 821 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
<span id="L822" class="LineNr"> 822 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L823" class="LineNr"> 823 </span>  ]
<span id="L824" class="LineNr"> 824 </span>]
<span id="L825" class="LineNr"> 825 </span>
<span id="L826" class="LineNr"> 826 </span><span class="Comment"># scrolling through sandboxes</span>
<span id="L827" class="LineNr"> 827 </span>
<span id="L828" class="LineNr"> 828 </span><span class="muScenario">scenario</span> scrolling-down-past-bottom-of-sandbox-editor [
<span id="L829" class="LineNr"> 829 </span>  <span class="Constant">local-scope</span>
<span id="L830" class="LineNr"> 830 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
<span id="L831" class="LineNr"> 831 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
<span id="L832" class="LineNr"> 832 </span>  <span class="Comment"># initialize</span>
<span id="L833" class="LineNr"> 833 </span>  assume-resources [
<span id="L834" class="LineNr"> 834 </span>  ]
<span id="L835" class="LineNr"> 835 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[add 2, 2]</span>
<span id="L836" class="LineNr"> 836 </span>  <a href='004-programming-environment.mu.html#L402'>render-all</a> <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L837" class="LineNr"> 837 </span>  assume-console [
<span id="L838" class="LineNr"> 838 </span>    <span class="Comment"># create a sandbox</span>
<span id="L839" class="LineNr"> 839 </span>    press F4
<span id="L840" class="LineNr"> 840 </span>  ]
<span id="L841" class="LineNr"> 841 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L842" class="LineNr"> 842 </span>  screen-should-contain [
<span id="L843" class="LineNr"> 843 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L844" class="LineNr"> 844 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L845" class="LineNr"> 845 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
<span id="L846" class="LineNr"> 846 </span>   <span class="Constant"> .                                                  ╎0   edit       copy       to recipe    delete    .</span>
<span id="L847" class="LineNr"> 847 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
<span id="L848" class="LineNr"> 848 </span>  ]
<span id="L849" class="LineNr"> 849 </span>  <span class="Comment"># switch to sandbox window and hit 'page-down'</span>
<span id="L850" class="LineNr"> 850 </span>  assume-console [
<span id="L851" class="LineNr"> 851 </span>    press ctrl-n
<span id="L852" class="LineNr"> 852 </span>    press <a href='003-shortcuts.mu.html#L3610'>page-down</a>
<span id="L853" class="LineNr"> 853 </span>  ]
<span id="L854" class="LineNr"> 854 </span>  run [
<span id="L855" class="LineNr"> 855 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L856" class="LineNr"> 856 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
<span id="L857" class="LineNr"> 857 </span>    print <a href='../081print.mu.html#L16'>screen</a>, cursor
<span id="L858" class="LineNr"> 858 </span>  ]
<span id="L859" class="LineNr"> 859 </span>  <span class="Comment"># sandbox editor hidden; first sandbox displayed</span>
<span id="L860" class="LineNr"> 860 </span>  <span class="Comment"># cursor moves to first sandbox</span>
<span id="L861" class="LineNr"> 861 </span>  screen-should-contain [
<span id="L862" class="LineNr"> 862 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L863" class="LineNr"> 863 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L864" class="LineNr"> 864 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎␣   edit       copy       to recipe    delete    .</span>
<span id="L865" class="LineNr"> 865 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
<span id="L866" class="LineNr"> 866 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
<span id="L867" class="LineNr"> 867 </span>  ]
<span id="L868" class="LineNr"> 868 </span>  <span class="Comment"># hit 'page-up'</span>
<span id="L869" class="LineNr"> 869 </span>  assume-console [
<span id="L870" class="LineNr"> 870 </span>    press <a href='003-shortcuts.mu.html#L3833'>page-up</a>
<span id="L871" class="LineNr"> 871 </span>  ]
<span id="L872" class="LineNr"> 872 </span>  run [
<span id="L873" class="LineNr"> 873 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L874" class="LineNr"> 874 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
<span id="L875" class="LineNr"> 875 </span>    print <a href='../081print.mu.html#L16'>screen</a>, cursor
<span id="L876" class="LineNr"> 876 </span>  ]
<span id="L877" class="LineNr"> 877 </span>  <span class="Comment"># sandbox editor displays again, cursor is in editor</span>
<span id="L878" class="LineNr"> 878 </span>  screen-should-contain [
<span id="L879" class="LineNr"> 879 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L880" class="LineNr"> 880 </span>   <span class="Constant"> .                                                  ╎␣                                                .</span>
<span id="L881" class="LineNr"> 881 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
<span id="L882" class="LineNr"> 882 </span>   <span class="Constant"> .                                                  ╎0   edit       copy       to recipe    delete    .</span>
<span id="L883" class="LineNr"> 883 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
<span id="L884" class="LineNr"> 884 </span>  ]
<span id="L885" class="LineNr"> 885 </span>]
<span id="L886" class="LineNr"> 886 </span>
<span id="L887" class="LineNr"> 887 </span><span class="Comment"># page-down on sandbox side updates render-from to scroll sandboxes</span>
<span id="L888" class="LineNr"> 888 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L62'>&lt;global-keypress&gt;</a></span> [
<span id="L889" class="LineNr"> 889 </span>  <span class="Delimiter">{</span>
<span id="L890" class="LineNr"> 890 </span>    <span class="muControl">break-unless</span> sandbox-in-focus?
<span id="L891" class="LineNr"> 891 </span>    page-down?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65518/page-down</span>
<span id="L892" class="LineNr"> 892 </span>    <span class="muControl">break-unless</span> page-down?
<span id="L893" class="LineNr"> 893 </span>    sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
<span id="L894" class="LineNr"> 894 </span>    <span class="muControl">break-unless</span> sandbox
<span id="L895" class="LineNr"> 895 </span>    <span class="Comment"># slide down if possible</span>
<span id="L896" class="LineNr"> 896 </span>    <span class="Delimiter">{</span>
<span id="L897" class="LineNr"> 897 </span>      render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
<span id="L898" class="LineNr"> 898 </span>      number-of-sandboxes:num <span class="Special">&lt;-</span> get *env, <span class="Constant">number-of-sandboxes:offset</span>
<span id="L899" class="LineNr"> 899 </span>      max:num <span class="Special">&lt;-</span> subtract number-of-sandboxes,<span class="Constant"> 1</span>
<span id="L900" class="LineNr"> 900 </span>      at-end?:bool <span class="Special">&lt;-</span> greater-or-equal render-from, max
<span id="L901" class="LineNr"> 901 </span>      <span class="muControl">loop-if</span> at-end?, <span class="Constant">+next-event</span>  <span class="Comment"># render nothing</span>
<span id="L902" class="LineNr"> 902 </span>      render-from <span class="Special">&lt;-</span> add render-from,<span class="Constant"> 1</span>
<span id="L903" class="LineNr"> 903 </span>      *env <span class="Special">&lt;-</span> put *env, <span class="Constant">render-from:offset</span>, render-from
<span id="L904" class="LineNr"> 904 </span>    <span class="Delimiter">}</span>
<span id="L905" class="LineNr"> 905 </span>    <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L906" class="LineNr"> 906 </span>    <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L468'>update-cursor</a> <a href='../081print.mu.html#L16'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
<span id="L907" class="LineNr"> 907 </span>   <span class="muControl"> loop</span> <span class="Constant">+next-event</span>
<span id="L908" class="LineNr"> 908 </span>  <span class="Delimiter">}</span>
<span id="L909" class="LineNr"> 909 </span>]
<span id="L910" class="LineNr"> 910 </span>
<span id="L911" class="LineNr"> 911 </span><span class="Comment"># update-cursor takes render-from into account</span>
<span id="L912" class="LineNr"> 912 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L471'>&lt;update-cursor-special-cases&gt;</a></span> [
<span id="L913" class="LineNr"> 913 </span>  <span class="Delimiter">{</span>
<span id="L914" class="LineNr"> 914 </span>    <span class="muControl">break-unless</span> sandbox-in-focus?
<span id="L915" class="LineNr"> 915 </span>    render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
<span id="L916" class="LineNr"> 916 </span>    scrolling?:bool <span class="Special">&lt;-</span> greater-or-equal render-from,<span class="Constant"> 0</span>
<span id="L917" class="LineNr"> 917 </span>    <span class="muControl">break-unless</span> scrolling?
<span id="L918" class="LineNr"> 918 </span>    cursor-column:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
<span id="L919" class="LineNr"> 919 </span>    <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> move-cursor <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">2/row</span>, cursor-column  <span class="Comment"># highlighted sandbox will always start at row 2</span>
<span id="L920" class="LineNr"> 920 </span>   <span class="muControl"> return</span>
<span id="L921" class="LineNr"> 921 </span>  <span class="Delimiter">}</span>
<span id="L922" class="LineNr"> 922 </span>]
<span id="L923" class="LineNr"> 923 </span>
<span id="L924" class="LineNr"> 924 </span><span class="Comment"># 'page-up' on sandbox side is like 'page-down': updates render-from when necessary</span>
<span id="L925" class="LineNr"> 925 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L62'>&lt;global-keypress&gt;</a></span> [
<span id="L926" class="LineNr"> 926 </span>  <span class="Delimiter">{</span>
<span id="L927" class="LineNr"> 927 </span>    <span class="muControl">break-unless</span> sandbox-in-focus?
<span id="L928" class="LineNr"> 928 </span>    page-up?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65519/page-up</span>
<span id="L929" class="LineNr"> 929 </span>    <span class="muControl">break-unless</span> page-up?
<span id="L930" class="LineNr"> 930 </span>    render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
<span id="L931" class="LineNr"> 931 </span>    at-beginning?:bool <span class="Special">&lt;-</span> equal render-from,<span class="Constant"> -1</span>
<span id="L932" class="LineNr"> 932 </span>    <span class="muControl">break-if</span> at-beginning?
<span id="L933" class="LineNr"> 933 </span>    render-from <span class="Special">&lt;-</span> subtract render-from,<span class="Constant"> 1</span>
<span id="L934" class="LineNr"> 934 </span>    *env <span class="Special">&lt;-</span> put *env, <span class="Constant">render-from:offset</span>, render-from
<span id="L935" class="LineNr"> 935 </span>    <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L936" class="LineNr"> 936 </span>    <a href='../081print.mu.html#L16'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L468'>update-cursor</a> <a href='../081print.mu.html#L16'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
<span id="L937" class="LineNr"> 937 </span>   <span class="muControl"> loop</span> <span class="Constant">+next-event</span>
<span id="L938" class="LineNr"> 938 </span>  <span class="Delimiter">}</span>
<span id="L939" class="LineNr"> 939 </span>]
<span id="L940" class="LineNr"> 940 </span>
<span id="L941" class="LineNr"> 941 </span><span class="Comment"># sandbox belonging to 'env' whose next-sandbox is 'in'</span>
<span id="L942" class="LineNr"> 942 </span><span class="Comment"># return null if there's no such sandbox, either because 'in' doesn't exist in 'env', or because it's the first sandbox</span>
<span id="L943" class="LineNr"> 943 </span><span class="muRecipe">def</span> <a href='005-sandbox.mu.html#L943'>previous-sandbox</a> env:&amp;:environment, in:&amp;:sandbox<span class="muRecipe"> -&gt; </span>out:&amp;:sandbox [
<span id="L944" class="LineNr"> 944 </span>  <span class="Constant">local-scope</span>
<span id="L945" class="LineNr"> 945 </span>  <span class="Constant">load-inputs</span>
<span id="L946" class="LineNr"> 946 </span>  curr:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
<span id="L947" class="LineNr"> 947 </span>  <span class="muControl">return-unless</span> curr,<span class="Constant"> null</span>
<span id="L948" class="LineNr"> 948 </span>  <a href='../065duplex_list.mu.html#L31'>next</a>:&amp;:sandbox <span class="Special">&lt;-</span> get *curr, <span class="Constant">next-sandbox:offset</span>
<span id="L949" class="LineNr"> 949 </span>  <span class="Delimiter">{</span>
<span id="L950" class="LineNr"> 950 </span>    <span class="muControl">return-unless</span> <a href='../065duplex_list.mu.html#L31'>next</a>,<span class="Constant"> null</span>
<span id="L951" class="LineNr"> 951 </span>    found?:bool <span class="Special">&lt;-</span> equal <a href='../065duplex_list.mu.html#L31'>next</a>, in
<span id="L952" class="LineNr"> 952 </span>    <span class="muControl">break-if</span> found?
<span id="L953" class="LineNr"> 953 </span>    curr <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L31'>next</a>
<span id="L954" class="LineNr"> 954 </span>    <a href='../065duplex_list.mu.html#L31'>next</a> <span class="Special">&lt;-</span> get *curr, <span class="Constant">next-sandbox:offset</span>
<span id="L955" class="LineNr"> 955 </span>   <span class="muControl"> loop</span>
<span id="L956" class="LineNr"> 956 </span>  <span class="Delimiter">}</span>
<span id="L957" class="LineNr"> 957 </span> <span class="muControl"> return</span> curr
<span id="L958" class="LineNr"> 958 </span>]
<span id="L959" class="LineNr"> 959 </span>
<span id="L960" class="LineNr"> 960 </span><span class="muScenario">scenario</span> scrolling-through-multiple-sandboxes [
<span id="L961" class="LineNr"> 961 </span>  <span class="Constant">local-scope</span>
<span id="L962" class="LineNr"> 962 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
<span id="L963" class="LineNr"> 963 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
<span id="L964" class="LineNr"> 964 </span>  <span class="Comment"># initialize environment</span>
<span id="L965" class="LineNr"> 965 </span>  assume-resources [
<span id="L966" class="LineNr"> 966 </span>  ]
<span id="L967" class="LineNr"> 967 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[]</span>
<span id="L968" class="LineNr"> 968 </span>  <a href='004-programming-environment.mu.html#L402'>render-all</a> <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L969" class="LineNr"> 969 </span>  <span class="Comment"># create 2 sandboxes</span>
<span id="L970" class="LineNr"> 970 </span>  assume-console [
<span id="L971" class="LineNr"> 971 </span>    press ctrl-n
<span id="L972" class="LineNr"> 972 </span>    type <span class="Constant">[add 2, 2]</span>
<span id="L973" class="LineNr"> 973 </span>    press F4
<span id="L974" class="LineNr"> 974 </span>    type <span class="Constant">[add 1, 1]</span>
<span id="L975" class="LineNr"> 975 </span>    press F4
<span id="L976" class="LineNr"> 976 </span>  ]
<span id="L977" class="LineNr"> 977 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L978" class="LineNr"> 978 </span>  cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
<span id="L979" class="LineNr"> 979 </span>  print <a href='../081print.mu.html#L16'>screen</a>, cursor
<span id="L980" class="LineNr"> 980 </span>  screen-should-contain [
<span id="L981" class="LineNr"> 981 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L982" class="LineNr"> 982 </span>   <span class="Constant"> .                                                  ╎␣                                                .</span>
<span id="L983" class="LineNr"> 983 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
<span id="L984" class="LineNr"> 984 </span>   <span class="Constant"> .                                                  ╎0   edit       copy       to recipe    delete    .</span>
<span id="L985" class="LineNr"> 985 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
<span id="L986" class="LineNr"> 986 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
<span id="L987" class="LineNr"> 987 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L988" class="LineNr"> 988 </span>   <span class="Constant"> .                                                  ╎1   edit       copy       to recipe    delete    .</span>
<span id="L989" class="LineNr"> 989 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
<span id="L990" class="LineNr"> 990 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
<span id="L991" class="LineNr"> 991 </span>  ]
<span id="L992" class="LineNr"> 992 </span>  <span class="Comment"># hit 'page-down'</span>
<span id="L993" class="LineNr"> 993 </span>  assume-console [
<span id="L994" class="LineNr"> 994 </span>    press <a href='003-shortcuts.mu.html#L3610'>page-down</a>
<span id="L995" class="LineNr"> 995 </span>  ]
<span id="L996" class="LineNr"> 996 </span>  run [
<span id="L997" class="LineNr"> 997 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L998" class="LineNr"> 998 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
<span id="L999" class="LineNr"> 999 </span>    print <a href='../081print.mu.html#L16'>screen</a>, cursor
<span id="L1000" class="LineNr">1000 </span>  ]
<span id="L1001" class="LineNr">1001 </span>  <span class="Comment"># sandbox editor hidden; first sandbox displayed</span>
<span id="L1002" class="LineNr">1002 </span>  <span class="Comment"># cursor moves to first sandbox</span>
<span id="L1003" class="LineNr">1003 </span>  screen-should-contain [
<span id="L1004" class="LineNr">1004 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L1005" class="LineNr">1005 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L1006" class="LineNr">1006 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎␣   edit       copy       to recipe    delete    .</span>
<span id="L1007" class="LineNr">1007 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
<span id="L1008" class="LineNr">1008 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
<span id="L1009" class="LineNr">1009 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L1010" class="LineNr">1010 </span>   <span class="Constant"> .                                                  ╎1   edit       copy       to recipe    delete    .</span>
<span id="L1011" class="LineNr">1011 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
<span id="L1012" class="LineNr">1012 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
<span id="L1013" class="LineNr">1013 </span>  ]
<span id="L1014" class="LineNr">1014 </span>  <span class="Comment"># hit 'page-down' again</span>
<span id="L1015" class="LineNr">1015 </span>  assume-console [
<span id="L1016" class="LineNr">1016 </span>    press <a href='003-shortcuts.mu.html#L3610'>page-down</a>
<span id="L1017" class="LineNr">1017 </span>  ]
<span id="L1018" class="LineNr">1018 </span>  run [
<span id="L1019" class="LineNr">1019 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L1020" class="LineNr">1020 </span>  ]
<span id="L1021" class="LineNr">1021 </span>  <span class="Comment"># just second sandbox displayed</span>
<span id="L1022" class="LineNr">1022 </span>  screen-should-contain [
<span id="L1023" class="LineNr">1023 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L1024" class="LineNr">1024 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L1025" class="LineNr">1025 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit       copy       to recipe    delete    .</span>
<span id="L1026" class="LineNr">1026 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
<span id="L1027" class="LineNr">1027 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
<span id="L1028" class="LineNr">1028 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L1029" class="LineNr">1029 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L1030" class="LineNr">1030 </span>  ]
<span id="L1031" class="LineNr">1031 </span>  <span class="Comment"># hit 'page-down' again</span>
<span id="L1032" class="LineNr">1032 </span>  assume-console [
<span id="L1033" class="LineNr">1033 </span>    press <a href='003-shortcuts.mu.html#L3610'>page-down</a>
<span id="L1034" class="LineNr">1034 </span>  ]
<span id="L1035" class="LineNr">1035 </span>  run [
<span id="L1036" class="LineNr">1036 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L1037" class="LineNr">1037 </span>  ]
<span id="L1038" class="LineNr">1038 </span>  <span class="Comment"># no change</span>
<span id="L1039" class="LineNr">1039 </span>  screen-should-contain [
<span id="L1040" class="LineNr">1040 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L1041" class="LineNr">1041 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L1042" class="LineNr">1042 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit       copy       to recipe    delete    .</span>
<span id="L1043" class="LineNr">1043 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
<span id="L1044" class="LineNr">1044 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
<span id="L1045" class="LineNr">1045 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L1046" class="LineNr">1046 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L1047" class="LineNr">1047 </span>  ]
<span id="L1048" class="LineNr">1048 </span>  <span class="Comment"># hit 'page-up'</span>
<span id="L1049" class="LineNr">1049 </span>  assume-console [
<span id="L1050" class="LineNr">1050 </span>    press <a href='003-shortcuts.mu.html#L3833'>page-up</a>
<span id="L1051" class="LineNr">1051 </span>  ]
<span id="L1052" class="LineNr">1052 </span>  run [
<span id="L1053" class="LineNr">1053 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L1054" class="LineNr">1054 </span>  ]
<span id="L1055" class="LineNr">1055 </span>  <span class="Comment"># back to displaying both sandboxes without editor</span>
<span id="L1056" class="LineNr">1056 </span>  screen-should-contain [
<span id="L1057" class="LineNr">1057 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L1058" class="LineNr">1058 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L1059" class="LineNr">1059 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit       copy       to recipe    delete    .</span>
<span id="L1060" class="LineNr">1060 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
<span id="L1061" class="LineNr">1061 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
<span id="L1062" class="LineNr">1062 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L1063" class="LineNr">1063 </span>   <span class="Constant"> .                                                  ╎1   edit       copy       to recipe    delete    .</span>
<span id="L1064" class="LineNr">1064 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
<span id="L1065" class="LineNr">1065 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
<span id="L1066" class="LineNr">1066 </span>  ]
<span id="L1067" class="LineNr">1067 </span>  <span class="Comment"># hit 'page-up' again</span>
<span id="L1068" class="LineNr">1068 </span>  assume-console [
<span id="L1069" class="LineNr">1069 </span>    press <a href='003-shortcuts.mu.html#L3833'>page-up</a>
<span id="L1070" class="LineNr">1070 </span>  ]
<span id="L1071" class="LineNr">1071 </span>  run [
<span id="L1072" class="LineNr">1072 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L1073" class="LineNr">1073 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
<span id="L1074" class="LineNr">1074 </span>    print <a href='../081print.mu.html#L16'>screen</a>, cursor
<span id="L1075" class="LineNr">1075 </span>  ]
<span id="L1076" class="LineNr">1076 </span>  <span class="Comment"># back to displaying both sandboxes as well as editor</span>
<span id="L1077" class="LineNr">1077 </span>  screen-should-contain [
<span id="L1078" class="LineNr">1078 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L1079" class="LineNr">1079 </span>   <span class="Constant"> .                                                  ╎␣                                                .</span>
<span id="L1080" class="LineNr">1080 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
<span id="L1081" class="LineNr">1081 </span>   <span class="Constant"> .                                                  ╎0   edit       copy       to recipe    delete    .</span>
<span id="L1082" class="LineNr">1082 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
<span id="L1083" class="LineNr">1083 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
<span id="L1084" class="LineNr">1084 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L1085" class="LineNr">1085 </span>   <span class="Constant"> .                                                  ╎1   edit       copy       to recipe    delete    .</span>
<span id="L1086" class="LineNr">1086 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
<span id="L1087" class="LineNr">1087 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
<span id="L1088" class="LineNr">1088 </span>  ]
<span id="L1089" class="LineNr">1089 </span>  <span class="Comment"># hit 'page-up' again</span>
<span id="L1090" class="LineNr">1090 </span>  assume-console [
<span id="L1091" class="LineNr">1091 </span>    press <a href='003-shortcuts.mu.html#L3833'>page-up</a>
<span id="L1092" class="LineNr">1092 </span>  ]
<span id="L1093" class="LineNr">1093 </span>  run [
<span id="L1094" class="LineNr">1094 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L1095" class="LineNr">1095 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
<span id="L1096" class="LineNr">1096 </span>    print <a href='../081print.mu.html#L16'>screen</a>, cursor
<span id="L1097" class="LineNr">1097 </span>  ]
<span id="L1098" class="LineNr">1098 </span>  <span class="Comment"># no change</span>
<span id="L1099" class="LineNr">1099 </span>  screen-should-contain [
<span id="L1100" class="LineNr">1100 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L1101" class="LineNr">1101 </span>   <span class="Constant"> .                                                  ╎␣                                                .</span>
<span id="L1102" class="LineNr">1102 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
<span id="L1103" class="LineNr">1103 </span>   <span class="Constant"> .                                                  ╎0   edit       copy       to recipe    delete    .</span>
<span id="L1104" class="LineNr">1104 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
<span id="L1105" class="LineNr">1105 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
<span id="L1106" class="LineNr">1106 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L1107" class="LineNr">1107 </span>   <span class="Constant"> .                                                  ╎1   edit       copy       to recipe    delete    .</span>
<span id="L1108" class="LineNr">1108 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
<span id="L1109" class="LineNr">1109 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
<span id="L1110" class="LineNr">1110 </span>  ]
<span id="L1111" class="LineNr">1111 </span>]
<span id="L1112" class="LineNr">1112 </span>
<span id="L1113" class="LineNr">1113 </span><span class="muScenario">scenario</span> scrolling-manages-sandbox-index-correctly [
<span id="L1114" class="LineNr">1114 </span>  <span class="Constant">local-scope</span>
<span id="L1115" class="LineNr">1115 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
<span id="L1116" class="LineNr">1116 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
<span id="L1117" class="LineNr">1117 </span>  <span class="Comment"># initialize environment</span>
<span id="L1118" class="LineNr">1118 </span>  assume-resources [
<span id="L1119" class="LineNr">1119 </span>  ]
<span id="L1120" class="LineNr">1120 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[]</span>
<span id="L1121" class="LineNr">1121 </span>  <a href='004-programming-environment.mu.html#L402'>render-all</a> <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L1122" class="LineNr">1122 </span>  <span class="Comment"># create a sandbox</span>
<span id="L1123" class="LineNr">1123 </span>  assume-console [
<span id="L1124" class="LineNr">1124 </span>    press ctrl-n
<span id="L1125" class="LineNr">1125 </span>    type <span class="Constant">[add 1, 1]</span>
<span id="L1126" class="LineNr">1126 </span>    press F4
<span id="L1127" class="LineNr">1127 </span>  ]
<span id="L1128" class="LineNr">1128 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L1129" class="LineNr">1129 </span>  screen-should-contain [
<span id="L1130" class="LineNr">1130 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L1131" class="LineNr">1131 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L1132" class="LineNr">1132 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
<span id="L1133" class="LineNr">1133 </span>   <span class="Constant"> .                                                  ╎0   edit       copy       to recipe    delete    .</span>
<span id="L1134" class="LineNr">1134 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
<span id="L1135" class="LineNr">1135 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
<span id="L1136" class="LineNr">1136 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L1137" class="LineNr">1137 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L1138" class="LineNr">1138 </span>  ]
<span id="L1139" class="LineNr">1139 </span>  <span class="Comment"># hit 'page-down' and 'page-up' a couple of times. sandbox index should be stable</span>
<span id="L1140" class="LineNr">1140 </span>  assume-console [
<span id="L1141" class="LineNr">1141 </span>    press <a href='003-shortcuts.mu.html#L3610'>page-down</a>
<span id="L1142" class="LineNr">1142 </span>  ]
<span id="L1143" class="LineNr">1143 </span>  run [
<span id="L1144" class="LineNr">1144 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L1145" class="LineNr">1145 </span>  ]
<span id="L1146" class="LineNr">1146 </span>  <span class="Comment"># sandbox editor hidden; first sandbox displayed</span>
<span id="L1147" class="LineNr">1147 </span>  <span class="Comment"># cursor moves to first sandbox</span>
<span id="L1148" class="LineNr">1148 </span>  screen-should-contain [
<span id="L1149" class="LineNr">1149 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L1150" class="LineNr">1150 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L1151" class="LineNr">1151 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit       copy       to recipe    delete    .</span>
<span id="L1152" class="LineNr">1152 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
<span id="L1153" class="LineNr">1153 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
<span id="L1154" class="LineNr">1154 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L1155" class="LineNr">1155 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L1156" class="LineNr">1156 </span>  ]
<span id="L1157" class="LineNr">1157 </span>  <span class="Comment"># hit 'page-up' again</span>
<span id="L1158" class="LineNr">1158 </span>  assume-console [
<span id="L1159" class="LineNr">1159 </span>    press <a href='003-shortcuts.mu.html#L3833'>page-up</a>
<span id="L1160" class="LineNr">1160 </span>  ]
<span id="L1161" class="LineNr">1161 </span>  run [
<span id="L1162" class="LineNr">1162 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L1163" class="LineNr">1163 </span>  ]
<span id="L1164" class="LineNr">1164 </span>  <span class="Comment"># back to displaying both sandboxes as well as editor</span>
<span id="L1165" class="LineNr">1165 </span>  screen-should-contain [
<span id="L1166" class="LineNr">1166 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L1167" class="LineNr">1167 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L1168" class="LineNr">1168 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
<span id="L1169" class="LineNr">1169 </span>   <span class="Constant"> .                                                  ╎0   edit       copy       to recipe    delete    .</span>
<span id="L1170" class="LineNr">1170 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
<span id="L1171" class="LineNr">1171 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
<span id="L1172" class="LineNr">1172 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L1173" class="LineNr">1173 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L1174" class="LineNr">1174 </span>  ]
<span id="L1175" class="LineNr">1175 </span>  <span class="Comment"># hit 'page-down'</span>
<span id="L1176" class="LineNr">1176 </span>  assume-console [
<span id="L1177" class="LineNr">1177 </span>    press <a href='003-shortcuts.mu.html#L3610'>page-down</a>
<span id="L1178" class="LineNr">1178 </span>  ]
<span id="L1179" class="LineNr">1179 </span>  run [
<span id="L1180" class="LineNr">1180 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L1181" class="LineNr">1181 </span>  ]
<span id="L1182" class="LineNr">1182 </span>  <span class="Comment"># sandbox editor hidden; first sandbox displayed</span>
<span id="L1183" class="LineNr">1183 </span>  <span class="Comment"># cursor moves to first sandbox</span>
<span id="L1184" class="LineNr">1184 </span>  screen-should-contain [
<span id="L1185" class="LineNr">1185 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
<span id="L1186" class="LineNr">1186 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L1187" class="LineNr">1187 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit       copy       to recipe    delete    .</span>
<span id="L1188" class="LineNr">1188 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
<span id="L1189" class="LineNr">1189 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
<span id="L1190" class="LineNr">1190 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
<span id="L1191" class="LineNr">1191 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
<span id="L1192" class="LineNr">1192 </span>  ]
<span id="L1193" class="LineNr">1193 </span>]
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->