1 ## running code from the editor and creating sandboxes
   2 #
   3 # Running code in the sandbox editor prepends its contents to a list of
   4 # (non-editable) sandboxes below the editor, showing the result and maybe a
   5 # few other things (later layers).
   6 #
   7 # This layer draws the menubar buttons in non-editable sandboxes but they
   8 # don't do anything yet. Later layers implement each button.
   9 
  10 def! main [
  11   local-scope
  12   open-console
  13   env:&:environment <- new-programming-environment 0/filesystem, 0/screen
  14   env <- restore-sandboxes env
  15   render-all 0/screen, env, render
  16   event-loop 0/screen, 0/console, env, 0/filesystem
  17   # never gets here
  18 ]
  19 
  20 container environment [
  21   sandbox:&:sandbox  # list of sandboxes, from top to bottom. TODO: switch to &:list:sandbox
  22   render-from:num
  23   number-of-sandboxes:num
  24 ]
  25 
  26 after <programming-environment-initialization> [
  27   *result <- put *result, render-from:offset, -1
  28 ]
  29 
  30 container sandbox [
  31   data:text
  32   response:text
  33   # coordinates to track clicks
  34   # constraint: will be 0 for sandboxes at positions before env.render-from
  35   starting-row-on-screen:num
  36   code-ending-row-on-screen:num  # past end of code
  37   screen:&:screen  # prints in the sandbox go here
  38   next-sandbox:&:sandbox
  39 ]
  40 
  41 scenario run-and-show-results [
  42   local-scope
  43   trace-until 100/app  # trace too long
  44   assume-screen 100/width, 15/height
  45   # recipe editor is empty
  46   assume-resources [
  47   ]
  48   # sandbox editor contains an instruction without storing outputs
  49   env:&:environment <- new-programming-environment resources, screen, [divide-with-remainder 11, 3]
  50   # run the code in the editors
  51   assume-console [
  52   ¦ press F4
  53   ]
  54   run [
  55   ¦ event-loop screen, console, env, resources
  56   ]
  57   # check that screen prints the results
  58   screen-should-contain [
  59   ¦ .                                                                                 run (F4)           .
  60   ¦ .                                                  ╎                                                 .
  61   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.
  62   ¦ .                                                  ╎0   edit          copy            delete         .
  63   ¦ .                                                  ╎divide-with-remainder 11, 3                      .
  64   ¦ .                                                  ╎3                                                .
  65   ¦ .                                                  ╎2                                                .
  66   ¦ .                                                  ╎─────────────────────────────────────────────────.
  67   ¦ .                                                  ╎                                                 .
  68   ]
  69   screen-should-contain-in-color 7/white, [
  70   ¦ .                                                                                                    .
  71   ¦ .                                                                                                    .
  72   ¦ .                                                                                                    .
  73   ¦ .                                                                                                    .
  74   ¦ .                                                   divide-with-remainder 11, 3                      .
  75   ¦ .                                                                                                    .
  76   ¦ .                                                                                                    .
  77   ¦ .                                                                                                    .
  78   ¦ .                                                                                                    .
  79   ]
  80   screen-should-contain-in-color 245/grey, [
  81   ¦ .                                                                                                    .
  82   ¦ .                                                  ╎                                                 .
  83   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.
  84   ¦ .                                                  ╎                                                 .
  85   ¦ .                                                  ╎                                                 .
  86   ¦ .                                                  ╎3                                                .
  87   ¦ .                                                  ╎2                                                .
  88   ¦ .                                                  ╎─────────────────────────────────────────────────.
  89   ¦ .                                                  ╎                                                 .
  90   ]
  91   # sandbox menu in reverse video
  92   screen-should-contain-in-color 232/black, [
  93   ¦ .                                                                                                    .
  94   ¦ .                                                                                                    .
  95   ¦ .                                                                                                    .
  96   ¦ .                                                   0   edit          copy            delete         .
  97   ]
  98   # run another command
  99   assume-console [
 100   ¦ left-click 1, 80
 101   ¦ type [add 2, 2]
 102   ¦ press F4
 103   ]
 104   run [
 105   ¦ event-loop screen, console, env, resources
 106   ]
 107   # check that screen prints both sandboxes
 108   screen-should-contain [
 109   ¦ .                                                                                 run (F4)           .
 110   ¦ .                                                  ╎                                                 .
 111   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.
 112   ¦ .                                                  ╎0   edit          copy            delete         .
 113   ¦ .                                                  ╎add 2, 2                                         .
 114   ¦ .                                                  ╎4                                                .
 115   ¦ .                                                  ╎─────────────────────────────────────────────────.
 116   ¦ .                                                  ╎1   edit          copy            delete         .
 117   ¦ .                                                  ╎divide-with-remainder 11, 3                      .
 118   ¦ .                                                  ╎3                                                .
 119   ¦ .                                                  ╎2                                                .
 120   ¦ .                                                  ╎─────────────────────────────────────────────────.
 121   ¦ .                                                  ╎                                                 .
 122   ]
 123 ]
 124 
 125 after <global-keypress> [
 126   # F4? load all code and run all sandboxes.
 127   {
 128   ¦ do-run?:bool <- equal k, 65532/F4
 129   ¦ break-unless do-run?
 130   ¦ screen <- update-status screen, [running...       ], 245/grey
 131   ¦ error?:bool <- run-sandboxes env, resources, screen
 132   ¦ # F4 might update warnings and results on both sides
 133   ¦ screen <- render-all screen, env, render
 134   ¦ {
 135   ¦ ¦ break-if error?
 136   ¦ ¦ screen <- update-status screen, [                 ], 245/grey
 137   ¦ }
 138   ¦ screen <- update-cursor screen, recipes, current-sandbox, sandbox-in-focus?, env
 139   ¦ loop +next-event
 140   }
 141 ]
 142 
 143 def run-sandboxes env:&:environment, resources:&:resources, screen:&:screen -> errors-found?:bool, env:&:environment, resources:&:resources, screen:&:screen [
 144   local-scope
 145   load-ingredients
 146   errors-found?:bool <- update-recipes env, resources, screen
 147   jump-if errors-found?, +return
 148   # check contents of right editor (sandbox)
 149   <run-sandboxes-begin>
 150   current-sandbox:&:editor <- get *env, current-sandbox:offset
 151   {
 152   ¦ sandbox-contents:text <- editor-contents current-sandbox
 153   ¦ break-unless sandbox-contents
 154   ¦ # if contents exist, first save them
 155   ¦ # run them and turn them into a new sandbox
 156   ¦ new-sandbox:&:sandbox <- new sandbox:type
 157   ¦ *new-sandbox <- put *new-sandbox, data:offset, sandbox-contents
 158   ¦ # push to head of sandbox list
 159   ¦ dest:&:sandbox <- get *env, sandbox:offset
 160   ¦ *new-sandbox <- put *new-sandbox, next-sandbox:offset, dest
 161   ¦ *env <- put *env, sandbox:offset, new-sandbox
 162   ¦ # update sandbox count
 163   ¦ sandbox-count:num <- get *env, number-of-sandboxes:offset
 164   ¦ sandbox-count <- add sandbox-count, 1
 165   ¦ *env <- put *env, number-of-sandboxes:offset, sandbox-count
 166   ¦ # clear sandbox editor
 167   ¦ init:&:duplex-list:char <- push 167/§, 0/tail
 168   ¦ *current-sandbox <- put *current-sandbox, data:offset, init
 169   ¦ *current-sandbox <- put *current-sandbox, top-of-screen:offset, init
 170   }
 171   # save all sandboxes before running, just in case we die when running
 172   save-sandboxes env, resources
 173   # run all sandboxes
 174   curr:&:sandbox <- get *env, sandbox:offset
 175   idx:num <- copy 0
 176   {
 177   ¦ break-unless curr
 178   ¦ curr <- update-sandbox curr, env, idx
 179   ¦ curr <- get *curr, next-sandbox:offset
 180   ¦ idx <- add idx, 1
 181   ¦ loop
 182   }
 183   <run-sandboxes-end>
 184   +return
 185   {
 186   ¦ break-if resources  # ignore this in tests
 187   ¦ $system [./snapshot_lesson]
 188   }
 189 ]
 190 
 191 # load code from disk
 192 # replaced in a later layer (whereupon errors-found? will actually be set)
 193 def update-recipes env:&:environment, resources:&:resources, screen:&:screen -> errors-found?:bool, env:&:environment, resources:&:resources, screen:&:screen [
 194   local-scope
 195   load-ingredients
 196   recipes:&:editor <- get *env, recipes:offset
 197   in:text <- editor-contents recipes
 198   resources <- dump resources, [lesson/recipes.mu], in
 199   reload in
 200   errors-found? <- copy 0/false
 201 ]
 202 
 203 # replaced in a later layer
 204 def update-sandbox sandbox:&:sandbox, env:&:environment, idx:num -> sandbox:&:sandbox, env:&:environment [
 205   local-scope
 206   load-ingredients
 207   data:text <- get *sandbox, data:offset
 208   response:text, _, fake-screen:&:screen <- run-sandboxed data
 209   *sandbox <- put *sandbox, response:offset, response
 210   *sandbox <- put *sandbox, screen:offset, fake-screen
 211 ]
 212 
 213 def update-status screen:&:screen, msg:text, color:num -> screen:&:screen [
 214   local-scope
 215   load-ingredients
 216   screen <- move-cursor screen, 0, 2
 217   screen <- print screen, msg, color, 238/grey/background
 218 ]
 219 
 220 def save-sandboxes env:&:environment, resources:&:resources -> resources:&:resources [
 221   local-scope
 222   load-ingredients
 223   current-sandbox:&:editor <- get *env, current-sandbox:offset
 224   # first clear previous versions, in case we deleted some sandbox
 225   $system [rm lesson/[0-9]* >/dev/null 2>/dev/null]  # some shells can't handle '>&'
 226   curr:&:sandbox <- get *env, sandbox:offset
 227   idx:num <- copy 0
 228   {
 229   ¦ break-unless curr
 230   ¦ data:text <- get *curr, data:offset
 231   ¦ filename:text <- append [lesson/], idx
 232   ¦ resources <- dump resources, filename, data
 233   ¦ <end-save-sandbox>
 234   ¦ idx <- add idx, 1
 235   ¦ curr <- get *curr, next-sandbox:offset
 236   ¦ loop
 237   }
 238 ]
 239 
 240 def! render-sandbox-side screen:&:screen, env:&:environment, {render-editor: (recipe (address screen) (address editor) -> number number (address screen) (address editor))} -> screen:&:screen, env:&:environment [
 241   local-scope
 242   load-ingredients
 243   trace 11, [app], [render sandbox side]
 244   current-sandbox:&:editor <- get *env, current-sandbox:offset
 245   row:num, column:num <- copy 1, 0
 246   left:num <- get *current-sandbox, left:offset
 247   right:num <- get *current-sandbox, right:offset
 248   # render sandbox editor
 249   render-from:num <- get *env, render-from:offset
 250   {
 251   ¦ render-current-sandbox?:bool <- equal render-from, -1
 252   ¦ break-unless render-current-sandbox?
 253   ¦ row, column, screen, current-sandbox <- call render-editor, screen, current-sandbox
 254   ¦ clear-screen-from screen, row, column, left, right
 255   ¦ row <- add row, 1
 256   }
 257   # render sandboxes
 258   draw-horizontal screen, row, left, right
 259   sandbox:&:sandbox <- get *env, sandbox:offset
 260   row, screen <- render-sandboxes screen, sandbox, left, right, row, render-from
 261   clear-rest-of-screen screen, row, left, right
 262 ]
 263 
 264 def render-sandboxes screen:&:screen, sandbox:&:sandbox, left:num, right:num, row:num, render-from:num, idx:num -> row:num, screen:&:screen, sandbox:&:sandbox [
 265   local-scope
 266   load-ingredients
 267   return-unless sandbox
 268   screen-height:num <- screen-height screen
 269   at-bottom?:bool <- greater-or-equal row, screen-height
 270   return-if at-bottom?:bool
 271   hidden?:bool <- lesser-than idx, render-from
 272   {
 273   ¦ break-if hidden?
 274   ¦ # render sandbox menu
 275   ¦ row <- add row, 1
 276   ¦ screen <- move-cursor screen, row, left
 277   ¦ screen <- render-sandbox-menu screen, idx, left, right
 278   ¦ # save menu row so we can detect clicks to it later
 279   ¦ *sandbox <- put *sandbox, starting-row-on-screen:offset, row
 280   ¦ # render sandbox contents
 281   ¦ row <- add row, 1
 282   ¦ screen <- move-cursor screen, row, left
 283   ¦ sandbox-data:text <- get *sandbox, data:offset
 284   ¦ row, screen <- render-code screen, sandbox-data, left, right, row
 285   ¦ *sandbox <- put *sandbox, code-ending-row-on-screen:offset, row
 286   ¦ # render sandbox warnings, screen or response, in that order
 287   ¦ sandbox-response:text <- get *sandbox, response:offset
 288   ¦ <render-sandbox-results>
 289   ¦ {
 290   ¦ ¦ sandbox-screen:&:screen <- get *sandbox, screen:offset
 291   ¦ ¦ empty-screen?:bool <- fake-screen-is-empty? sandbox-screen
 292   ¦ ¦ break-if empty-screen?
 293   ¦ ¦ row, screen <- render-screen screen, sandbox-screen, left, right, row
 294   ¦ }
 295   ¦ {
 296   ¦ ¦ break-unless empty-screen?
 297   ¦ ¦ <render-sandbox-response>
 298   ¦ ¦ row, screen <- render-text screen, sandbox-response, left, right, 245/grey, row
 299   ¦ }
 300   ¦ +render-sandbox-end
 301   ¦ at-bottom?:bool <- greater-or-equal row, screen-height
 302   ¦ return-if at-bottom?
 303   ¦ # draw solid line after sandbox
 304   ¦ draw-horizontal screen, row, left, right
 305   }
 306   # if hidden, reset row attributes
 307   {
 308   ¦ break-unless hidden?
 309   ¦ *sandbox <- put *sandbox, starting-row-on-screen:offset, 0
 310   ¦ *sandbox <- put *sandbox, code-ending-row-on-screen:offset, 0
 311   ¦ <end-render-sandbox-reset-hidden>
 312   }
 313   # draw next sandbox
 314   next-sandbox:&:sandbox <- get *sandbox, next-sandbox:offset
 315   next-idx:num <- add idx, 1
 316   row, screen <- render-sandboxes screen, next-sandbox, left, right, row, render-from, next-idx
 317 ]
 318 
 319 def render-sandbox-menu screen:&:screen, sandbox-index:num, left:num, right:num -> screen:&:screen [
 320   local-scope
 321   load-ingredients
 322   move-cursor-to-column screen, left
 323   edit-button-left:num, edit-button-right:num, copy-button-left:num, copy-button-right:num, delete-button-left:num <- sandbox-menu-columns left, right
 324   print screen, sandbox-index, 232/dark-grey, 245/grey
 325   start-buttons:num <- subtract edit-button-left, 1
 326   clear-line-until screen, start-buttons, 245/grey
 327   print screen, [edit], 232/black, 94/background-orange
 328   clear-line-until screen, edit-button-right, 94/background-orange
 329   _, col:num <- cursor-position screen
 330   at-start-of-copy-button?:bool <- equal col, copy-button-left
 331   assert at-start-of-copy-button?, [aaa]
 332   print screen, [copy], 232/black, 58/background-green
 333   clear-line-until screen, copy-button-right, 58/background-green
 334   _, col:num <- cursor-position screen
 335   at-start-of-delete-button?:bool <- equal col, delete-button-left
 336   assert at-start-of-delete-button?, [bbb]
 337   print screen, [delete], 232/black, 52/background-red
 338   clear-line-until screen, right, 52/background-red
 339 ]
 340 
 341 # divide up the menu bar for a sandbox into 3 segments, for edit/copy/delete buttons
 342 # delete-button-right == right
 343 # all left/right pairs are inclusive
 344 def sandbox-menu-columns left:num, right:num -> edit-button-left:num, edit-button-right:num, copy-button-left:num, copy-button-right:num, delete-button-left:num [
 345   local-scope
 346   load-ingredients
 347   start-buttons:num <- add left, 4/space-for-sandbox-index
 348   buttons-space:num <- subtract right, start-buttons
 349   button-width:num <- divide-with-remainder buttons-space, 3  # integer division
 350   buttons-wide-enough?:bool <- greater-or-equal button-width, 8
 351   assert buttons-wide-enough?, [sandbox must be at least 30 or so characters wide]
 352   edit-button-left:num <- copy start-buttons
 353   copy-button-left:num <- add start-buttons, button-width
 354   edit-button-right:num <- subtract copy-button-left, 1
 355   delete-button-left:num <- subtract right, button-width
 356   copy-button-right:num <- subtract delete-button-left, 1
 357 ]
 358 
 359 # print a text 's' to 'editor' in 'color' starting at 'row'
 360 # clear rest of last line, move cursor to next line
 361 def render-text screen:&:screen, s:text, left:num, right:num, color:num, row:num -> row:num, screen:&:screen [
 362   local-scope
 363   load-ingredients
 364   return-unless s
 365   column:num <- copy left
 366   screen <- move-cursor screen, row, column
 367   screen-height:num <- screen-height screen
 368   i:num <- copy 0
 369   len:num <- length *s
 370   {
 371   ¦ +next-character
 372   ¦ done?:bool <- greater-or-equal i, len
 373   ¦ break-if done?
 374   ¦ done? <- greater-or-equal row, screen-height
 375   ¦ break-if done?
 376   ¦ c:char <- index *s, i
 377   ¦ {
 378   ¦ ¦ # at right? wrap.
 379   ¦ ¦ at-right?:bool <- equal column, right
 380   ¦ ¦ break-unless at-right?
 381   ¦ ¦ # print wrap icon
 382   ¦ ¦ wrap-icon:char <- copy 8617/loop-back-to-left
 383   ¦ ¦ print screen, wrap-icon, 245/grey
 384   ¦ ¦ column <- copy left
 385   ¦ ¦ row <- add row, 1
 386   ¦ ¦ screen <- move-cursor screen, row, column
 387   ¦ ¦ loop +next-character  # retry i
 388   ¦ }
 389   ¦ i <- add i, 1
 390   ¦ {
 391   ¦ ¦ # newline? move to left rather than 0
 392   ¦ ¦ newline?:bool <- equal c, 10/newline
 393   ¦ ¦ break-unless newline?
 394   ¦ ¦ # clear rest of line in this window
 395   ¦ ¦ {
 396   ¦ ¦ ¦ done?:bool <- greater-than column, right
 397   ¦ ¦ ¦ break-if done?
 398   ¦ ¦ ¦ space:char <- copy 32/space
 399   ¦ ¦ ¦ print screen, space
 400   ¦ ¦ ¦ column <- add column, 1
 401   ¦ ¦ ¦ loop
 402   ¦ ¦ }
 403   ¦ ¦ row <- add row, 1
 404   ¦ ¦ column <- copy left
 405   ¦ ¦ screen <- move-cursor screen, row, column
 406   ¦ ¦ loop +next-character
 407   ¦ }
 408   ¦ print screen, c, color
 409   ¦ column <- add column, 1
 410   ¦ loop
 411   }
 412   was-at-left?:bool <- equal column, left
 413   clear-line-until screen, right
 414   {
 415   ¦ break-if was-at-left?
 416   ¦ row <- add row, 1
 417   }
 418   move-cursor screen, row, left
 419 ]
 420 
 421 # assumes programming environment has no sandboxes; restores them from previous session
 422 def restore-sandboxes env:&:environment, resources:&:resources -> env:&:environment [
 423   local-scope
 424   load-ingredients
 425   # read all scenarios, pushing them to end of a list of scenarios
 426   idx:num <- copy 0
 427   curr:&:sandbox <- copy 0
 428   prev:&:sandbox <- copy 0
 429   {
 430   ¦ filename:text <- append [lesson/], idx
 431   ¦ contents:text <- slurp resources, filename
 432   ¦ break-unless contents  # stop at first error; assuming file didn't exist
 433   ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦      # todo: handle empty sandbox
 434   ¦ # create new sandbox for file
 435   ¦ curr <- new sandbox:type
 436   ¦ *curr <- put *curr, data:offset, contents
 437   ¦ <end-restore-sandbox>
 438   ¦ {
 439   ¦ ¦ break-if idx
 440   ¦ ¦ *env <- put *env, sandbox:offset, curr
 441   ¦ }
 442   ¦ {
 443   ¦ ¦ break-unless idx
 444   ¦ ¦ *prev <- put *prev, next-sandbox:offset, curr
 445   ¦ }
 446   ¦ idx <- add idx, 1
 447   ¦ prev <- copy curr
 448   ¦ loop
 449   }
 450   # update sandbox count
 451   *env <- put *env, number-of-sandboxes:offset, idx
 452 ]
 453 
 454 # print the fake sandbox screen to 'screen' with appropriate delimiters
 455 # leave cursor at start of next line
 456 def render-screen screen:&:screen, sandbox-screen:&:screen, left:num, right:num, row:num -> row:num, screen:&:screen [
 457   local-scope
 458   load-ingredients
 459   return-unless sandbox-screen
 460   # print 'screen:'
 461   row <- render-text screen, [screen:], left, right, 245/grey, row
 462   screen <- move-cursor screen, row, left
 463   # start printing sandbox-screen
 464   column:num <- copy left
 465   s-width:num <- screen-width sandbox-screen
 466   s-height:num <- screen-height sandbox-screen
 467   buf:&:@:screen-cell <- get *sandbox-screen, data:offset
 468   stop-printing:num <- add left, s-width, 3
 469   max-column:num <- min stop-printing, right
 470   i:num <- copy 0
 471   len:num <- length *buf
 472   screen-height:num <- screen-height screen
 473   {
 474   ¦ done?:bool <- greater-or-equal i, len
 475   ¦ break-if done?
 476   ¦ done? <- greater-or-equal row, screen-height
 477   ¦ break-if done?
 478   ¦ column <- copy left
 479   ¦ screen <- move-cursor screen, row, column
 480   ¦ # initial leader for each row: two spaces and a '.'
 481   ¦ space:char <- copy 32/space
 482   ¦ print screen, space, 245/grey
 483   ¦ print screen, space, 245/grey
 484   ¦ full-stop:char <- copy 46/period
 485   ¦ print screen, full-stop, 245/grey
 486   ¦ column <- add left, 3
 487   ¦ {
 488   ¦ ¦ # print row
 489   ¦ ¦ row-done?:bool <- greater-or-equal column, max-column
 490   ¦ ¦ break-if row-done?
 491   ¦ ¦ curr:screen-cell <- index *buf, i
 492   ¦ ¦ c:char <- get curr, contents:offset
 493   ¦ ¦ color:num <- get curr, color:offset
 494   ¦ ¦ {
 495   ¦ ¦ ¦ # damp whites down to grey
 496   ¦ ¦ ¦ white?:bool <- equal color, 7/white
 497   ¦ ¦ ¦ break-unless white?
 498   ¦ ¦ ¦ color <- copy 245/grey
 499   ¦ ¦ }
 500   ¦ ¦ print screen, c, color
 501   ¦ ¦ column <- add column, 1
 502   ¦ ¦ i <- add i, 1
 503   ¦ ¦ loop
 504   ¦ }
 505   ¦ # print final '.'
 506   ¦ print screen, full-stop, 245/grey
 507   ¦ column <- add column, 1
 508   ¦ {
 509   ¦ ¦ # clear rest of current line
 510   ¦ ¦ line-done?:bool <- greater-than column, right
 511   ¦ ¦ break-if line-done?
 512   ¦ ¦ print screen, space
 513   ¦ ¦ column <- add column, 1
 514   ¦ ¦ loop
 515   ¦ }
 516   ¦ row <- add row, 1
 517   ¦ loop
 518   }
 519 ]
 520 
 521 scenario run-updates-results [
 522   local-scope
 523   trace-until 100/app  # trace too long
 524   assume-screen 100/width, 12/height
 525   # define a recipe (no indent for the 'add' line below so column numbers are more obvious)
 526   assume-resources [
 527   ¦ [lesson/recipes.mu] <- [
 528   ¦ ¦ ||
 529   ¦ ¦ |recipe foo [|
 530   ¦ ¦ |  local-scope|
 531   ¦ ¦ |  z:num <- add 2, 2|
 532   ¦ ¦ |  reply z|
 533   ¦ ¦ |]|
 534   ¦ ]
 535   ]
 536   # sandbox editor contains an instruction without storing outputs
 537   env:&:environment <- new-programming-environment resources, screen, [foo]  # contents of sandbox editor
 538   # run the code in the editors
 539   assume-console [
 540   ¦ press F4
 541   ]
 542   event-loop screen, console, env, resources
 543   screen-should-contain [
 544   ¦ .                                                                                 run (F4)           .
 545   ¦ .                                                  ╎                                                 .
 546   ¦ .recipe foo [                                      ╎─────────────────────────────────────────────────.
 547   ¦ .  local-scope                                     ╎0   edit          copy            delete         .
 548   ¦ .  z:num <- add 2, 2                               ╎foo                                              .
 549   ¦ .  reply z                                         ╎4                                                .
 550   ¦ .]                                                 ╎─────────────────────────────────────────────────.
 551   ¦ .                                                  ╎                                                 .
 552   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .
 553   ¦ .                                                  ╎                                                 .
 554   ]
 555   # make a change (incrementing one of the args to 'add'), then rerun
 556   assume-console [
 557   ¦ left-click 4, 28  # one past the value of the second arg
 558   ¦ press backspace
 559   ¦ type [3]
 560   ¦ press F4
 561   ]
 562   run [
 563   ¦ event-loop screen, console, env, resources
 564   ]
 565   # check that screen updates the result on the right
 566   screen-should-contain [
 567   ¦ .                                                                                 run (F4)           .
 568   ¦ .                                                  ╎                                                 .
 569   ¦ .recipe foo [                                      ╎─────────────────────────────────────────────────.
 570   ¦ .  local-scope                                     ╎0   edit          copy            delete         .
 571   ¦ .  z:num <- add 2, 3                               ╎foo                                              .
 572   ¦ .  reply z                                         ╎5                                                .
 573   ¦ .]                                                 ╎─────────────────────────────────────────────────.
 574   ¦ .                                                  ╎                                                 .
 575   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .
 576   ¦ .                                                  ╎                                                 .
 577   ]
 578 ]
 579 
 580 scenario run-instruction-manages-screen-per-sandbox [
 581   local-scope
 582   trace-until 100/app  # trace too long
 583   assume-screen 100/width, 20/height
 584   # empty recipes
 585   assume-resources [
 586   ]
 587   # sandbox editor contains an instruction
 588   env:&:environment <- new-programming-environment resources, screen, [print screen, 4]  # contents of sandbox editor
 589   # run the code in the editor
 590   assume-console [
 591   ¦ press F4
 592   ]
 593   run [
 594   ¦ event-loop screen, console, env, resources
 595   ]
 596   # check that it prints a little toy screen
 597   screen-should-contain [
 598   ¦ .                                                                                 run (F4)           .
 599   ¦ .                                                  ╎                                                 .
 600   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.
 601   ¦ .                                                  ╎0   edit          copy            delete         .
 602   ¦ .                                                  ╎print screen, 4                                  .
 603   ¦ .                                                  ╎screen:                                          .
 604   ¦ .                                                  ╎  .4                             .               .
 605   ¦ .                                                  ╎  .                              .               .
 606   ¦ .                                                  ╎  .                              .               .
 607   ¦ .                                                  ╎  .                              .               .
 608   ¦ .                                                  ╎  .                              .               .
 609   ¦ .                                                  ╎─────────────────────────────────────────────────.
 610   ¦ .                                                  ╎                                                 .
 611   ]
 612 ]
 613 
 614 def editor-contents editor:&:editor -> result:text [
 615   local-scope
 616   load-ingredients
 617   buf:&:buffer <- new-buffer 80
 618   curr:&:duplex-list:char <- get *editor, data:offset
 619   # skip § sentinel
 620   assert curr, [editor without data is illegal; must have at least a sentinel]
 621   curr <- next curr
 622   return-unless curr, 0
 623   {
 624   ¦ break-unless curr
 625   ¦ c:char <- get *curr, value:offset
 626   ¦ buf <- append buf, c
 627   ¦ curr <- next curr
 628   ¦ loop
 629   }
 630   result <- buffer-to-array buf
 631 ]
 632 
 633 scenario editor-provides-edited-contents [
 634   local-scope
 635   assume-screen 10/width, 5/height
 636   e:&:editor <- new-editor [abc], 0/left, 10/right
 637   assume-console [
 638   ¦ left-click 1, 2
 639   ¦ type [def]
 640   ]
 641   run [
 642   ¦ editor-event-loop screen, console, e
 643   ¦ s:text <- editor-contents e
 644   ¦ 1:@:char/raw <- copy *s
 645   ]
 646   memory-should-contain [
 647   ¦ 1:array:character <- [abdefc]
 648   ]
 649 ]
 650 
 651 # keep the bottom of recipes from scrolling off the screen
 652 
 653 scenario scrolling-down-past-bottom-of-recipe-editor [
 654   local-scope
 655   trace-until 100/app
 656   assume-screen 100/width, 10/height
 657   assume-resources [
 658   ]
 659   env:&:environment <- new-programming-environment resources, screen, []
 660   render-all screen, env, render
 661   assume-console [
 662   ¦ press enter
 663   ¦ press down-arrow
 664   ]
 665   event-loop screen, console, env, resources
 666   # no scroll
 667   screen-should-contain [
 668   ¦ .                                                                                 run (F4)           .
 669   ¦ .                                                  ╎                                                 .
 670   ¦ .                                                  ╎─────────────────────────────────────────────────.
 671   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .
 672   ¦ .                                                  ╎                                                 .
 673   ]
 674 ]
 675 
 676 scenario cursor-down-in-recipe-editor [
 677   local-scope
 678   trace-until 100/app
 679   assume-screen 100/width, 10/height
 680   assume-resources [
 681   ]
 682   env:&:environment <- new-programming-environment resources, screen, []
 683   render-all screen, env, render
 684   assume-console [
 685   ¦ press enter
 686   ¦ press up-arrow
 687   ¦ press down-arrow  # while cursor isn't at bottom
 688   ]
 689   event-loop screen, console, env, resources
 690   cursor:char <- copy 9251/␣
 691   print screen, cursor
 692   # cursor moves back to bottom
 693   screen-should-contain [
 694   ¦ .                                                                                 run (F4)           .
 695   ¦ .                                                  ╎                                                 .
 696   ¦ .␣                                                 ╎─────────────────────────────────────────────────.
 697   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .
 698   ¦ .                                                  ╎                                                 .
 699   ]
 700 ]
 701 
 702 # we'll not use the recipe-editor's 'bottom' element directly, because later
 703 # layers will add other stuff to the left side below the editor (error messages)
 704 
 705 container environment [
 706   recipe-bottom:num
 707 ]
 708 
 709 after <render-recipe-components-end> [
 710   *env <- put *env, recipe-bottom:offset, row
 711 ]
 712 
 713 after <global-keypress> [
 714   {
 715   ¦ break-if sandbox-in-focus?
 716   ¦ down-arrow?:bool <- equal k, 65516/down-arrow
 717   ¦ break-unless down-arrow?
 718   ¦ recipe-editor:&:editor <- get *env, recipes:offset
 719   ¦ recipe-cursor-row:num <- get *recipe-editor, cursor-row:offset
 720   ¦ recipe-editor-bottom:num <- get *recipe-editor, bottom:offset
 721   ¦ at-bottom-of-editor?:bool <- greater-or-equal recipe-cursor-row, recipe-editor-bottom
 722   ¦ break-unless at-bottom-of-editor?
 723   ¦ more-to-scroll?:bool <- more-to-scroll? env, screen
 724   ¦ break-if more-to-scroll?
 725   ¦ loop +next-event
 726   }
 727   {
 728   ¦ break-if sandbox-in-focus?
 729   ¦ page-down?:bool <- equal k, 65518/page-down
 730   ¦ break-unless page-down?
 731   ¦ more-to-scroll?:bool <- more-to-scroll? env, screen
 732   ¦ break-if more-to-scroll?
 733   ¦ loop +next-event
 734   }
 735 ]
 736 
 737 after <global-type> [
 738   {
 739   ¦ break-if sandbox-in-focus?
 740   ¦ page-down?:bool <- equal k, 6/ctrl-f
 741   ¦ break-unless page-down?
 742   ¦ more-to-scroll?:bool <- more-to-scroll? env, screen
 743   ¦ break-if more-to-scroll?
 744   ¦ loop +next-event
 745   }
 746 ]
 747 
 748 def more-to-scroll? env:&:environment, screen:&:screen -> result:bool [
 749   local-scope
 750   load-ingredients
 751   recipe-bottom:num <- get *env, recipe-bottom:offset
 752   height:num <- screen-height screen
 753   result <- greater-or-equal recipe-bottom, height
 754 ]
 755 
 756 scenario scrolling-down-past-bottom-of-recipe-editor-2 [
 757   local-scope
 758   trace-until 100/app
 759   assume-screen 100/width, 10/height
 760   assume-resources [
 761   ]
 762   env:&:environment <- new-programming-environment resources, screen, []
 763   render-all screen, env, render
 764   assume-console [
 765   ¦ # add a line
 766   ¦ press enter
 767   ¦ # cursor back to top line
 768   ¦ press up-arrow
 769   ¦ # try to scroll
 770   ¦ press page-down  # or ctrl-f
 771   ]
 772   event-loop screen, console, env, resources
 773   # no scroll, and cursor remains at top line
 774   screen-should-contain [
 775   ¦ .                                                                                 run (F4)           .
 776   ¦ .                                                  ╎                                                 .
 777   ¦ .                                                  ╎─────────────────────────────────────────────────.
 778   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .
 779   ¦ .                                                  ╎                                                 .
 780   ]
 781 ]
 782 
 783 scenario scrolling-down-past-bottom-of-recipe-editor-3 [
 784   local-scope
 785   trace-until 100/app
 786   assume-screen 100/width, 10/height
 787   assume-resources [
 788   ]
 789   env:&:environment <- new-programming-environment resources, screen, [ab
 790 cd]
 791   render-all screen, env, render
 792   assume-console [
 793   ¦ # add a line
 794   ¦ press enter
 795   ¦ # switch to sandbox
 796   ¦ press ctrl-n
 797   ¦ # move cursor
 798   ¦ press down-arrow
 799   ]
 800   event-loop screen, console, env, resources
 801   cursor:char <- copy 9251/␣
 802   print screen, cursor
 803   # no scroll on recipe side, cursor moves on sandbox side
 804   screen-should-contain [
 805   ¦ .                                                                                 run (F4)           .
 806   ¦ .                                                  ╎ab                                               .
 807   ¦ .                                                  ╎␣d                                               .
 808   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.
 809   ¦ .                                                  ╎                                                 .
 810   ]
 811 ]
 812 
 813 # scrolling through sandboxes
 814 
 815 scenario scrolling-down-past-bottom-of-sandbox-editor [
 816   local-scope
 817   trace-until 100/app  # trace too long
 818   assume-screen 100/width, 10/height
 819   # initialize
 820   assume-resources [
 821   ]
 822   env:&:environment <- new-programming-environment resources, screen, [add 2, 2]
 823   render-all screen, env, render
 824   assume-console [
 825   ¦ # create a sandbox
 826   ¦ press F4
 827   ]
 828   event-loop screen, console, env, resources
 829   screen-should-contain [
 830   ¦ .                                                                                 run (F4)           .
 831   ¦ .                                                  ╎                                                 .
 832   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.
 833   ¦ .                                                  ╎0   edit          copy            delete         .
 834   ¦ .                                                  ╎add 2, 2                                         .
 835   ]
 836   # switch to sandbox window and hit 'page-down'
 837   assume-console [
 838   ¦ press ctrl-n
 839   ¦ press page-down
 840   ]
 841   run [
 842   ¦ event-loop screen, console, env, resources
 843   ¦ cursor:char <- copy 9251/␣
 844   ¦ print screen, cursor
 845   ]
 846   # sandbox editor hidden; first sandbox displayed
 847   # cursor moves to first sandbox
 848   screen-should-contain [
 849   ¦ .                                                                                 run (F4)           .
 850   ¦ .                                                  ╎─────────────────────────────────────────────────.
 851   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎␣   edit          copy            delete         .
 852   ¦ .                                                  ╎add 2, 2                                         .
 853   ¦ .                                                  ╎4                                                .
 854   ]
 855   # hit 'page-up'
 856   assume-console [
 857   ¦ press page-up
 858   ]
 859   run [
 860   ¦ event-loop screen, console, env, resources
 861   ¦ cursor:char <- copy 9251/␣
 862   ¦ print screen, cursor
 863   ]
 864   # sandbox editor displays again, cursor is in editor
 865   screen-should-contain [
 866   ¦ .                                                                                 run (F4)           .
 867   ¦ .                                                  ╎␣                                                .
 868   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.
 869   ¦ .                                                  ╎0   edit          copy            delete         .
 870   ¦ .                                                  ╎add 2, 2                                         .
 871   ]
 872 ]
 873 
 874 # page-down on sandbox side updates render-from to scroll sandboxes
 875 after <global-keypress> [
 876   {
 877   ¦ break-unless sandbox-in-focus?
 878   ¦ page-down?:bool <- equal k, 65518/page-down
 879   ¦ break-unless page-down?
 880   ¦ sandbox:&:sandbox <- get *env, sandbox:offset
 881   ¦ break-unless sandbox
 882   ¦ # slide down if possible
 883   ¦ {
 884   ¦ ¦ render-from:num <- get *env, render-from:offset
 885   ¦ ¦ number-of-sandboxes:num <- get *env, number-of-sandboxes:offset
 886   ¦ ¦ max:num <- subtract number-of-sandboxes, 1
 887   ¦ ¦ at-end?:bool <- greater-or-equal render-from, max
 888   ¦ ¦ jump-if at-end?, +finish-event  # render nothing
 889   ¦ ¦ render-from <- add render-from, 1
 890   ¦ ¦ *env <- put *env, render-from:offset, render-from
 891   ¦ }
 892   ¦ hide-screen screen
 893   ¦ screen <- render-sandbox-side screen, env, render
 894   ¦ show-screen screen
 895   ¦ jump +finish-event
 896   }
 897 ]
 898 
 899 # update-cursor takes render-from into account
 900 after <update-cursor-special-cases> [
 901   {
 902   ¦ break-unless sandbox-in-focus?
 903   ¦ render-from:num <- get *env, render-from:offset
 904   ¦ scrolling?:bool <- greater-or-equal render-from, 0
 905   ¦ break-unless scrolling?
 906   ¦ cursor-column:num <- get *current-sandbox, left:offset
 907   ¦ screen <- move-cursor screen, 2/row, cursor-column  # highlighted sandbox will always start at row 2
 908   ¦ return
 909   }
 910 ]
 911 
 912 # 'page-up' on sandbox side is like 'page-down': updates render-from when necessary
 913 after <global-keypress> [
 914   {
 915   ¦ break-unless sandbox-in-focus?
 916   ¦ page-up?:bool <- equal k, 65519/page-up
 917   ¦ break-unless page-up?
 918   ¦ render-from:num <- get *env, render-from:offset
 919   ¦ at-beginning?:bool <- equal render-from, -1
 920   ¦ break-if at-beginning?
 921   ¦ render-from <- subtract render-from, 1
 922   ¦ *env <- put *env, render-from:offset, render-from
 923   ¦ hide-screen screen
 924   ¦ screen <- render-sandbox-side screen, env, render
 925   ¦ show-screen screen
 926   ¦ jump +finish-event
 927   }
 928 ]
 929 
 930 # sandbox belonging to 'env' whose next-sandbox is 'in'
 931 # return 0 if there's no such sandbox, either because 'in' doesn't exist in 'env', or because it's the first sandbox
 932 def previous-sandbox env:&:environment, in:&:sandbox -> out:&:sandbox [
 933   local-scope
 934   load-ingredients
 935   curr:&:sandbox <- get *env, sandbox:offset
 936   return-unless curr, 0/nil
 937   next:&:sandbox <- get *curr, next-sandbox:offset
 938   {
 939   ¦ return-unless next, 0/nil
 940   ¦ found?:bool <- equal next, in
 941   ¦ break-if found?
 942   ¦ curr <- copy next
 943   ¦ next <- get *curr, next-sandbox:offset
 944   ¦ loop
 945   }
 946   return curr
 947 ]
 948 
 949 scenario scrolling-down-past-bottom-on-recipe-side [
 950   local-scope
 951   trace-until 100/app  # trace too long
 952   assume-screen 100/width, 10/height
 953   # initialize sandbox side and create a sandbox
 954   assume-resources [
 955   ¦ [lesson/recipes.mu] <- [
 956   ¦ ¦ ||  # file containing just a newline
 957   ¦ ]
 958   ]
 959   # create a sandbox
 960   env:&:environment <- new-programming-environment resources, screen, [add 2, 2]
 961   render-all screen, env, render
 962   assume-console [
 963   ¦ press F4
 964   ]
 965   event-loop screen, console, env, resources
 966   # hit 'down' in recipe editor
 967   assume-console [
 968   ¦ press page-down
 969   ]
 970   run [
 971   ¦ event-loop screen, console, env, resources
 972   ¦ cursor:char <- copy 9251/␣
 973   ¦ print screen, cursor
 974   ]
 975   # cursor doesn't move when the end is already on-screen
 976   screen-should-contain [
 977   ¦ .                                                                                 run (F4)           .
 978   ¦ .␣                                                 ╎                                                 .
 979   ¦ .                                                  ╎─────────────────────────────────────────────────.
 980   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .
 981   ¦ .                                                  ╎add 2, 2                                         .
 982   ]
 983 ]
 984 
 985 scenario scrolling-through-multiple-sandboxes [
 986   local-scope
 987   trace-until 100/app  # trace too long
 988   assume-screen 100/width, 10/height
 989   # initialize environment
 990   assume-resources [
 991   ]
 992   env:&:environment <- new-programming-environment resources, screen, []
 993   render-all screen, env, render
 994   # create 2 sandboxes
 995   assume-console [
 996   ¦ press ctrl-n
 997   ¦ type [add 2, 2]
 998   ¦ press F4
 999   ¦ type [add 1, 1]
1000   ¦ press F4
1001   ]
1002   event-loop screen, console, env, resources
1003   cursor:char <- copy 9251/␣
1004   print screen, cursor
1005   screen-should-contain [
1006   ¦ .                                                                                 run (F4)           .
1007   ¦ .                                                  ╎␣                                                .
1008   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.
1009   ¦ .                                                  ╎0   edit          copy            delete         .
1010   ¦ .                                                  ╎add 1, 1                                         .
1011   ¦ .                                                  ╎2                                                .
1012   ¦ .                                                  ╎─────────────────────────────────────────────────.
1013   ¦ .                                                  ╎1   edit          copy            delete         .
1014   ¦ .                                                  ╎add 2, 2                                         .
1015   ¦ .                                                  ╎4                                                .
1016   ]
1017   # hit 'page-down'
1018   assume-console [
1019   ¦ press page-down
1020   ]
1021   run [
1022   ¦ event-loop screen, console, env, resources
1023   ¦ cursor:char <- copy 9251/␣
1024   ¦ print screen, cursor
1025   ]
1026   # sandbox editor hidden; first sandbox displayed
1027   # cursor moves to first sandbox
1028   screen-should-contain [
1029   ¦ .                                                                                 run (F4)           .
1030   ¦ .                                                  ╎─────────────────────────────────────────────────.
1031   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎␣   edit          copy            delete         .
1032   ¦ .                                                  ╎add 1, 1                                         .
1033   ¦ .                                                  ╎2                                                .
1034   ¦ .                                                  ╎─────────────────────────────────────────────────.
1035   ¦ .                                                  ╎1   edit          copy            delete         .
1036   ¦ .                                                  ╎add 2, 2                                         .
1037   ¦ .                                                  ╎4                                                .
1038   ]
1039   # hit 'page-down' again
1040   assume-console [
1041   ¦ press page-down
1042   ]
1043   run [
1044   ¦ event-loop screen, console, env, resources
1045   ]
1046   # just second sandbox displayed
1047   screen-should-contain [
1048   ¦ .                                                                                 run (F4)           .
1049   ¦ .                                                  ╎─────────────────────────────────────────────────.
1050   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit          copy            delete         .
1051   ¦ .                                                  ╎add 2, 2                                         .
1052   ¦ .                                                  ╎4                                                .
1053   ¦ .                                                  ╎─────────────────────────────────────────────────.
1054   ¦ .                                                  ╎                                                 .
1055   ]
1056   # hit 'page-down' again
1057   assume-console [
1058   ¦ press page-down
1059   ]
1060   run [
1061   ¦ event-loop screen, console, env, resources
1062   ]
1063   # no change
1064   screen-should-contain [
1065   ¦ .                                                                                 run (F4)           .
1066   ¦ .                                                  ╎─────────────────────────────────────────────────.
1067   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit          copy            delete         .
1068   ¦ .                                                  ╎add 2, 2                                         .
1069   ¦ .                                                  ╎4                                                .
1070   ¦ .                                                  ╎─────────────────────────────────────────────────.
1071   ¦ .                                                  ╎                                                 .
1072   ]
1073   # hit 'page-up'
1074   assume-console [
1075   ¦ press page-up
1076   ]
1077   run [
1078   ¦ event-loop screen, console, env, resources
1079   ]
1080   # back to displaying both sandboxes without editor
1081   screen-should-contain [
1082   ¦ .                                                                                 run (F4)           .
1083   ¦ .                                                  ╎─────────────────────────────────────────────────.
1084   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .
1085   ¦ .                                                  ╎add 1, 1                                         .
1086   ¦ .                                                  ╎2                                                .
1087   ¦ .                                                  ╎─────────────────────────────────────────────────.
1088   ¦ .                                                  ╎1   edit          copy            delete         .
1089   ¦ .                                                  ╎add 2, 2                                         .
1090   ¦ .                                                  ╎4                                                .
1091   ]
1092   # hit 'page-up' again
1093   assume-console [
1094   ¦ press page-up
1095   ]
1096   run [
1097   ¦ event-loop screen, console, env, resources
1098   ¦ cursor:char <- copy 9251/␣
1099   ¦ print screen, cursor
1100   ]
1101   # back to displaying both sandboxes as well as editor
1102   screen-should-contain [
1103   ¦ .                                                                                 run (F4)           .
1104   ¦ .                                                  ╎␣                                                .
1105   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.
1106   ¦ .                                                  ╎0   edit          copy            delete         .
1107   ¦ .                                                  ╎add 1, 1                                         .
1108   ¦ .                                                  ╎2                                                .
1109   ¦ .                                                  ╎─────────────────────────────────────────────────.
1110   ¦ .                                                  ╎1   edit          copy            delete         .
1111   ¦ .                                                  ╎add 2, 2                                         .
1112   ¦ .                                                  ╎4                                                .
1113   ]
1114   # hit 'page-up' again
1115   assume-console [
1116   ¦ press page-up
1117   ]
1118   run [
1119   ¦ event-loop screen, console, env, resources
1120   ¦ cursor:char <- copy 9251/␣
1121   ¦ print screen, cursor
1122   ]
1123   # no change
1124   screen-should-contain [
1125   ¦ .                                                                                 run (F4)           .
1126   ¦ .                                                  ╎␣                                                .
1127   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.
1128   ¦ .                                                  ╎0   edit          copy            delete         .
1129   ¦ .                                                  ╎add 1, 1                                         .
1130   ¦ .                                                  ╎2                                                .
1131   ¦ .                                                  ╎─────────────────────────────────────────────────.
1132   ¦ .                                                  ╎1   edit          copy            delete         .
1133   ¦ .                                                  ╎add 2, 2                                         .
1134   ¦ .                                                  ╎4                                                .
1135   ]
1136 ]
1137 
1138 scenario scrolling-manages-sandbox-index-correctly [
1139   local-scope
1140   trace-until 100/app  # trace too long
1141   assume-screen 100/width, 10/height
1142   # initialize environment
1143   assume-resources [
1144   ]
1145   env:&:environment <- new-programming-environment resources, screen, []
1146   render-all screen, env, render
1147   # create a sandbox
1148   assume-console [
1149   ¦ press ctrl-n
1150   ¦ type [add 1, 1]
1151   ¦ press F4
1152   ]
1153   event-loop screen, console, env, resources
1154   screen-should-contain [
1155   ¦ .                                                                                 run (F4)           .
1156   ¦ .                                                  ╎                                                 .
1157   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.
1158   ¦ .                                                  ╎0   edit          copy            delete         .
1159   ¦ .                                                  ╎add 1, 1                                         .
1160   ¦ .                                                  ╎2                                                .
1161   ¦ .                                                  ╎─────────────────────────────────────────────────.
1162   ¦ .                                                  ╎                                                 .
1163   ]
1164   # hit 'page-down' and 'page-up' a couple of times. sandbox index should be stable
1165   assume-console [
1166   ¦ press page-down
1167   ]
1168   run [
1169   ¦ event-loop screen, console, env, resources
1170   ]
1171   # sandbox editor hidden; first sandbox displayed
1172   # cursor moves to first sandbox
1173   screen-should-contain [
1174   ¦ .                                                                                 run (F4)           .
1175   ¦ .                                                  ╎─────────────────────────────────────────────────.
1176   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .
1177   ¦ .                                                  ╎add 1, 1                                         .
1178   ¦ .                                                  ╎2                                                .
1179   ¦ .                                                  ╎─────────────────────────────────────────────────.
1180   ¦ .                                                  ╎                                                 .
1181   ]
1182   # hit 'page-up' again
1183   assume-console [
1184   ¦ press page-up
1185   ]
1186   run [
1187   ¦ event-loop screen, console, env, resources
1188   ]
1189   # back to displaying both sandboxes as well as editor
1190   screen-should-contain [
1191   ¦ .                                                                                 run (F4)           .
1192   ¦ .                                                  ╎                                                 .
1193   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.
1194   ¦ .                                                  ╎0   edit          copy            delete         .
1195   ¦ .                                                  ╎add 1, 1                                         .
1196   ¦ .                                                  ╎2                                                .
1197   ¦ .                                                  ╎─────────────────────────────────────────────────.
1198   ¦ .                                                  ╎                                                 .
1199   ]
1200   # hit 'page-down'
1201   assume-console [
1202   ¦ press page-down
1203   ]
1204   run [
1205   ¦ event-loop screen, console, env, resources
1206   ]
1207   # sandbox editor hidden; first sandbox displayed
1208   # cursor moves to first sandbox
1209   screen-should-contain [
1210   ¦ .                                                                                 run (F4)           .
1211   ¦ .                                                  ╎─────────────────────────────────────────────────.
1212   ¦ .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .
1213   ¦ .                                                  ╎add 1, 1                                         .
1214   ¦ .                                                  ╎2                                                .
1215   ¦ .                                                  ╎─────────────────────────────────────────────────.
1216   ¦ .                                                  ╎                                                 .
1217   ]
1218 ]