summary refs log blame commit diff stats
path: root/doc/ranger.1
blob: 968e601badeb08ab2fc64bfee0b59c1166dc6985 (plain) (tree)
1
2
3
4
5
6
7
8
9
                         
        
                            





                                            






                                                                              


















                                                                            
                
                                                                        
                                                                    
   
                                 

                                                            










                                                                              
                       


















                                                                            





                 


                                     












































                                                                         






                                                                           
      

                 






                                                                    


































                                                                           
                                         
                                                             





                                                                    
                                                          

                                                                       
                                                            
























                                                                    

                                                                

                                                     
.TH RANGER 1 ranger-1.3.0
.SH NAME
ranger - visual file manager
.\"-----------------------------------------
.SH SYNOPSIS
.B ranger
.R [OPTIONS] [FILE]
.\"-----------------------------------------
.SH DESCRIPTION
Ranger is a file manager with an ncurses frontend written in Python.
.P
It is designed to give you a broader overview of the file system by displaying
previews and backviews, dividing the screen into several columns.
The keybindings are similar to those of other console programs like
.BR vim ", " mutt " or " ncmpcpp
so the usage will be intuitive and efficient.
.\"-----------------------------------------
.SH OPTIONS
.TP
--version
Print the version and exit.
.TP
-h, --help
Print a list of options and exit.
.TP
-d, --debug
Activate the debug mode:  Whenever an error occurs, ranger will exit and
print a full backtrace.  The default behaviour is to merely print the
name of the exception in the statusbar/log and to try to keep running.
.TP
-c, --clean
Activate the clean mode:  Ranger will not access or create any configuration
files nor will it leave any traces on your system.  This is useful when
your configuration is broken, when you want to avoid clutter, etc.
.TP
--fail-unless-cd
Return the exit code 1 if ranger is used to run a file, for example with
`ranger --fail-unless-cd filename`.  This can be useful for scripts.
.TP
-r \fIdir\fR, --confdir=\fIdir\fR
Define a different configuration directory.  The default is
$XDG_CONFIG_HOME/ranger (which defaults to ~/.config/ranger)
.TP
-m \fIn\fR, --mode=\fIn\fR
When a filename is supplied, make it run in mode \fIn\fR. Check the
documentation for more information on modes.
.TP
-f \fIflags\fR, --flags=\fIflags\fR
When a filename is supplied, make it run with the flags \fIflags\fR. Check the
documentation for more information on flags.
.\"-----------------------------------------
.SH USAGE
.\"-----------------------------------------
.SS General Keybindings
Many keybindings take an additional numeric argument.  Type \fI5j\fR to move
down 5 lines, \fI10<Space>\fR to mark 10 files or \fI3?\fR to read the
third chapter of the documentation.
.TP
h, j, k, l
Move left, down, up, right
.TP
^D or J, ^U or K
Move a half page down, up
.TP
H, L
Move back and forward in the history
.TP
gg
Move to the top
.TP
G
Move to the bottom
.TP
^R
Reload everything
.TP
^L
Redraw the screen
.TP
S
Open a shell in the current directory
.TP
yy
Yank the selection.  (mark the files as copied)
.TP
dd
Cut the selection
.TP
pp
Paste the copied/cut files.  By default, this will not overwrite existing
files.  To overwrite them, use \fBpo\fR.
.TP
m\fIX\fR
Create a bookmark with the name \fIX\fR
.TP
`\fIX\fR
Move to the bookmark with the name \fIX\fR
.TP
n, N
Find the next file, the previous file.  You can define what to look for
by typing c\fIX\fR.  If nothing is specified, pressing n will get you to
the newest file in the directory.
.TP
o\fIX\fR
Change the sort method (like in mutt)
.TP
z\fIX\fR
Change settings
.TP
f
Quickly navigate by entering a part of the filename
.TP
Space
Mark a file
.TP
v, V
Toggle the mark-status of all files, unmark all files
.TP
/
Open the search console
.TP
:
Open the command console
.TP
?
Opens the help screen with more keybindings and documentation
.\"-----------------------------------------
.SS Keybindings for using Tabs
Tabs are used to work in different directories in the same Ranger instance.
.TP
g\fIN\fR
Open a tab. N has to be a number from 0 to 9. If the tab doesn't exist yet,
it will be created.
.TP
gn, ^N
Create a new tab.
.TP
gt, gT
Go to the next or previous tab.  You can also use TAB and SHIFT+TAB.
.TP
gc, ^W
Close the current tab.  The last tab cannot be closed.
.P
.\"-----------------------------------------
.SS Mouse Usage
.TP
Left Mouse Button
Click on something and you'll move there.
To run a file, "enter" it, like a directory, by clicking on the preview.
.TP
Right Mouse Button
Enter a directory
.TP
Scroll Wheel
Scroll
.\"-----------------------------------------
.SS Commands
.TP
:delete
Destroy all files in the selection with a roundhouse kick.  Ranger will
ask for a confirmation if you attempt to delete multiple (marked) files or
non-empty directories.
.TP
:rename \fInewname\fR
Rename the current file.  Also try the keybinding A for appending something
to a file name.
.TP
:quit
Quit ranger.  The current directory will be bookmarked as ' so you can
re-enter it by typing `` or '' the next time you start ranger.
.\"-----------------------------------------
.SH TIPS
.SS
Change the directory after exit
A script like this in your bashrc would make you change the directory
of your parent shell after exiting ranger:
.nf

ranger() {
    command ranger --fail-unless-cd $@ &&
    cd "$(grep \\^\\' ~/.config/ranger/bookmarks | cut -b3-)"
}
.\"-----------------------------------------
.SH CONFIGURATION
The files in
.B ranger/defaults/
can be copied into your configuration directory (by default, this is
~/.config/ranger) and customized according to your wishes.
Most files don't have to be copied completely though: Just define those
settings you want to add or change and they will override the defauls.
Colorschemes can be placed in ~/.config/ranger/colorschemes.
.P
All configuration is done in Python.
Each configuration file should contain sufficient documentation.
.\"-----------------------------------------
.SH COPYRIGHT
Copyright \(co
2009, 2010
Roman Zimbelmann
.P
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

There is NO warranty;
not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
.\"-----------------------------------------
.SH SEE ALSO
The project page:
.RB < http://savannah.nongnu.org/projects/ranger >
.P
The mailing list:
.RB < http://savannah.nongnu.org/mail/?group=ranger >
.\"-----------------------------------------
.SH BUGS
Please report them here and include as much relevant information
as possible:
.P
.RB < http://savannah.nongnu.org/bugs/?group=ranger >
a>
c98d4b1c ^
b31455f8 ^


71eb22a5 ^
7a583220 ^
33352536 ^

ee9a9237 ^
33352536 ^









6030d7e2 ^
71eb22a5 ^
33352536 ^
71eb22a5 ^
33352536 ^
71eb22a5 ^
33352536 ^
9d27e966 ^
33352536 ^
6030d7e2 ^
33352536 ^

cf02c20b ^
ee9a9237 ^
33352536 ^



7a583220 ^
33352536 ^

6030d7e2 ^
b31455f8 ^
6030d7e2 ^

33352536 ^


6030d7e2 ^
33352536 ^

6030d7e2 ^

33352536 ^


6030d7e2 ^
33352536 ^

6030d7e2 ^

33352536 ^

b31455f8 ^
9d27e966 ^
b31455f8 ^

fdf84d43 ^
6030d7e2 ^
ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
33352536 ^
38ef68b2 ^
ee9a9237 ^
38ef68b2 ^
ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
33352536 ^
6030d7e2 ^
ee9a9237 ^
6030d7e2 ^

ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
33352536 ^

ee9a9237 ^
38ef68b2 ^
6030d7e2 ^
ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
33352536 ^

ee9a9237 ^
22fb844b ^
6030d7e2 ^
33352536 ^
ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
33352536 ^
38ef68b2 ^
ee9a9237 ^
6030d7e2 ^
ddd2e989 ^
38ef68b2 ^
ee9a9237 ^
ddd2e989 ^
ee9a9237 ^
33352536 ^
6030d7e2 ^

b31455f8 ^

9d27e966 ^
6030d7e2 ^
ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
33352536 ^
38ef68b2 ^
ee9a9237 ^
38ef68b2 ^
ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
33352536 ^
6030d7e2 ^
ee9a9237 ^
6030d7e2 ^

ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
33352536 ^
38ef68b2 ^
ee9a9237 ^
38ef68b2 ^
6030d7e2 ^
ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
33352536 ^
6030d7e2 ^
ee9a9237 ^
6030d7e2 ^

ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
33352536 ^
38ef68b2 ^
ee9a9237 ^
38ef68b2 ^
6030d7e2 ^
ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
33352536 ^
38ef68b2 ^
ee9a9237 ^
6030d7e2 ^
ddd2e989 ^
38ef68b2 ^
ee9a9237 ^
ddd2e989 ^
ee9a9237 ^
33352536 ^
6030d7e2 ^

b31455f8 ^

9d27e966 ^


ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
33352536 ^
38ef68b2 ^
ee9a9237 ^
38ef68b2 ^
ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
33352536 ^
9d27e966 ^
ee9a9237 ^
6030d7e2 ^

ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
33352536 ^
9d27e966 ^
38ef68b2 ^
ee9a9237 ^
38ef68b2 ^
6030d7e2 ^
ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
33352536 ^
9d27e966 ^
38ef68b2 ^
ee9a9237 ^
38ef68b2 ^
6030d7e2 ^
ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
33352536 ^

ee9a9237 ^
6030d7e2 ^

33352536 ^
ee9a9237 ^
6030d7e2 ^
ee9a9237 ^
33352536 ^
6030d7e2 ^

b31455f8 ^


f1eade72 ^
6030d7e2 ^
9b16f190 ^
6030d7e2 ^
9b16f190 ^


6030d7e2 ^

6ee77ba7 ^
ee9a9237 ^
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










































                                                                              


                                                                                                                                                 
 
                                                                                      
                

                                                                                                                                                                       
                                                                                                                       
                                                                                                                                                                        
                                       
                   

                                                                                                                                                                      
              
                         
                      
                                                                                                                                                                  

                            
           
                                                   
                      






                                                                                                                                                                             
                                                                            
                                 


                                                                                                                                                                              
                                


                                                                                                                                                                              
                                  


                                                                                                                                                                              
                                 


                                                                                                                                                                              
              
                             
                      




                                                                                                                                                                           
                         

                 
          
                

                                                                                                                                                                       
             
 
           
 


                                                                                               
                                                                                      
                

                                                                                                                                                                       
                      

                                                                    
                                  



                                                                                                                                                                             
                          

                                                                                                                                                                         
                     
                                                                                                                                                                      
                  
                                                                                                                                                                     


                             
                                                                                                                                                                  

                         
                 
                

                                                                                                                                                                       


                               
                                                                                                  
                

                                                                                                                                                                       
                      














                                                                                                                                                                             

                            
                                                                                                                                                                            
                                           
                                                                          
                                                                                                                                                                            
                                           
                

                                                                                                                                                                               
                          
                    
          
                    
           
                    


                                  




                 
                

                                                                                                                                                                       

             
                                                                                  


                                                                        
                                                                   
                

                                                                                                                                                                       
                      









                                                                                                                                                                             
                                                                 
                 
                                                                                                                                                                            
                                        
                                                                                                                                                                              
                                          
                                                                                                                                                                             
                 
                                
                         

                                                                                                                                                                       
           
                         



                 
                

                                                                                                                                                                       
             
 

                               


                         
                   

                              

          


                         
                   

                                 

                                                                               

                                                                             
 
         

                 
                                                                     
                                
                   
                               
              
                                
                      
                                                                                                                                                                  
                                    
                   
                                   
              
                                
                      
                                                                                                                                                                  
                               
                   

                               
              
                         
                      

                                                                                                                                                                  
                   
                                   
                               
              
                        
                      

                                                                                                                                                                  
                   
                                                       
                    
               
              
                                    
                      
                                                                                                                                                                  
                                                     
                   
                                         
                       
                                   
              
                                      
                      
                                                                                                                                                                  

             

                      
                                                                         
                                
                   
                               
              
                                
                      
                                                                                                                                                                  
                                    
                   
                                   
              
                                
                      
                                                                                                                                                                  
                              
                   

                               
              
                         
                      
                                                                                                                                                                  
                                          
                   
                                   
                               
              
                        
                      
                                                                                                                                                                  
                              
                   

                               
              
                         
                      
                                                                                                                                                                  
                                          
                   
                                   
                               
              
                        
                      
                                                                                                                                                                  
                                                     
                   
                                              
                       
                                   
              
                                      
                      
                                                                                                                                                                  

             

                                   


                                                              
                   
                               
              
                                
                      
                                                                                                                                                                  
                                      
                   
                                   
              
                                
                      
                                                                                                                                                                  
                                 
                   

                               
              
                         
                      
                                                                                                                                                                  
                                    
                                            
                   
                                   
                               
              
                        
                      
                                                                                                                                                                  
                 
                                            
                   
                                   
                               
              
                        
                      

                                                                                                                                                                  
                   

                                                           
               
              
                                    
                      
                                                                                                                                                                  

             


       
                                  
                         
           
                        


            

                                      
 
                            
# read: analogously to write, support reading from in-memory streams in
# addition to file descriptors.
#
# We can pass it either a file descriptor or an address to a stream. If a
# file descriptor is passed in, we _read from it using the right syscall. If a
# stream is passed in (a fake file descriptor), we read from it instead. This
# lets us initialize input for tests.
#
# A little counter-intuitively, the output of 'read' ends up in.. a stream. So
# tests end up doing a redundant copy. Why? Well, consider the alternatives:
#
#   a) Reading into a string, and returning a pointer to the end of the read
#   region, or a count of bytes written. Now this count or end pointer must be
#   managed separately by the caller, which can be error-prone.
#
#   b) Having 'read' return a buffer that it allocates. But there's no way to
#   know in advance how large to make the buffer. If you read less than the
#   size of the buffer you again end up needing to manage initialized vs
#   uninitialized memory.
#
#   c) Creating more helpful variants like 'read-byte' or 'read-until' which
#   also can take a file descriptor or stream, just like 'write'. But such
#   primitives don't exist in the Linux kernel, so we'd be implementing them
#   somehow, either with more internal buffering or by making multiple
#   syscalls.
#
# Reading into a stream avoids these problems. The buffer is externally
# provided and the caller has control over where it's allocated, its lifetime,
# and so on. The buffer's read and write pointers are internal to it so it's
# easier to keep in a consistent state. And it can now be passed directly to
# helpers like 'read-byte' or 'read-until' that only need to support streams,
# never file descriptors.
#
# Like with 'write', we assume our data segment will never begin at an address
# shorter than 0x08000000, so any smaller arguments are assumed to be real
# file descriptors.
#
# As a reminder, a stream looks like this:
#   write: int  # index at which to write to next
#   read: int  # index at which to read next
#   data: (array byte)  # prefixed by length as usual

== code
#   instruction                     effective address                                                   register    displacement    immediate
# . op          subop               mod             rm32          base        index         scale       r32
# . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes

read:  # f: fd or (addr stream byte), s: (addr stream byte) -> num-bytes-read/eax: int
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # if (f < 0x08000000) return _read(f, s)  # f can't be a user-mode address, so treat it as a kernel file descriptor
    81          7/subop/compare     1/mod/*+disp8   5/rm32/ebp    .           .             .           .           8/disp8         0x08000000/imm32  # compare *(ebp+8)
    73/jump-if-addr>=  $read:fake/disp8
    # . . push args
    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0xc/disp8       .                 # push *(ebp+12)
    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           8/disp8         .                 # push *(ebp+8)
    # . . call
    e8/call  _read/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # return
    eb/jump  $read:end/disp8
$read:fake:
    # otherwise, treat 'f' as a stream to scan from
    # . save registers
    56/push-esi
    57/push-edi
    # esi = f
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           6/r32/esi   8/disp8         .                 # copy *(ebp+8) to esi
    # edi = s
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           7/r32/edi   0xc/disp8       .                 # copy *(ebp+12) to esi
    # eax = _buffer-4(out = &s->data[s->write], outend = &s->data[s->length],
    #                 in  = &f->data[f->read],  inend  = &f->data[f->write])
    # . . push &f->data[f->write]
    8b/copy                         0/mod/indirect  6/rm32/esi    .           .             .           0/r32/eax   .               .                 # copy *esi to eax
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    6/base/esi  0/index/eax   .           0/r32/eax   0xc/disp8       .                 # copy esi+eax+12 to eax
    50/push-eax
    # . . push &f->data[f->read]
    8b/copy                         1/mod/*+disp8   6/rm32/esi    .           .             .           0/r32/eax   4/disp8         .                 # copy *(esi+4) to eax
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    6/base/esi  0/index/eax   .           0/r32/eax   0xc/disp8       .                 # copy esi+eax+12 to eax
    50/push-eax
    # . . push &s->data[s->length]
    8b/copy                         1/mod/*+disp8   7/rm32/edi    .           .             .           0/r32/eax   8/disp8         .                 # copy *(edi+8) to eax
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    7/base/edi  0/index/eax   .           0/r32/eax   0xc/disp8       .                 # copy edi+eax+12 to eax
    50/push-eax
    # . . push &s->data[s->write]
    8b/copy                         0/mod/indirect  7/rm32/edi    .           .             .           0/r32/eax   .               .                 # copy *edi to eax
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    7/base/edi  0/index/eax   .           0/r32/eax   0xc/disp8       .                 # copy edi+eax+12 to eax
    50/push-eax
    # . . call
    e8/call  _buffer-4/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0x10/imm32        # add to esp
    # s->write += eax
    01/add                          0/mod/indirect  7/rm32/edi    .           .             .           0/r32/eax   .               .                 # add eax to *edi
    # f->read += eax
    01/add                          1/mod/*+disp8   6/rm32/esi    .           .             .           0/r32/eax   4/disp8         .                 # add eax to *(esi+4)
    # . restore registers
    5f/pop-to-edi
    5e/pop-to-esi
$read:end:
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

# - helpers

# '_buffer' is like '_append', but silently stops instead of aborting when it runs out of space

# 3-argument variant of _buffer
_buffer-3:  # out: address, outend: address, s: (array byte) -> num_bytes_buffered/eax
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    51/push-ecx
    # eax = _buffer-4(out, outend, &s->data[0], &s->data[s->length])
    # . . push &s->data[s->length]
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .                         0/r32/eax   0x10/disp8      .                 # copy *(ebp+16) to eax
    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
    51/push-ecx
    # . . push &s->data[0]
    8d/copy-address                 1/mod/*+disp8   0/rm32/eax    .           .             .           1/r32/ecx   4/disp8         .                 # copy eax+4 to ecx
    51/push-ecx
    # . . push outend
    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           0xc/disp8       .                 # push *(ebp+12)
    # . . push out
    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           8/disp8         .                 # push *(ebp+8)
    # . . call
    e8/call  _buffer-4/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0x10/imm32        # add to esp
$_buffer-3:end:
    # . restore registers
    59/pop-to-ecx
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

# 4-argument variant of _buffer
_buffer-4:  # out: address, outend: address, in: address, inend: address -> num_bytes_buffered/eax
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    51/push-ecx
    52/push-edx
    53/push-ebx
    56/push-esi
    57/push-edi
    # eax/num_bytes_buffered = 0
    b8/copy-to-eax  0/imm32
    # edi = out
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           7/r32/edi   8/disp8         .                 # copy *(ebp+8) to edi
    # edx = outend
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           2/r32/edx   0xc/disp8       .                 # copy *(ebp+12) to edx
    # esi = in
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           6/r32/esi   0x10/disp8      .                 # copy *(ebp+16) to esi
    # ecx = inend
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           1/r32/ecx   0x14/disp8      .                 # copy *(ebp+20) to ecx
$_buffer-4:loop:
    # if (in >= inend) break
    39/compare                      3/mod/direct    6/rm32/esi    .           .             .           1/r32/ecx   .               .                 # compare esi with ecx
    73/jump-if-addr>=  $_buffer-4:end/disp8
    # if (out >= outend) break  # for now silently ignore filled up buffer
    39/compare                      3/mod/direct    7/rm32/edi    .           .             .           2/r32/edx   .               .                 # compare edi with edx
    73/jump-if-addr>=  $_buffer-4:end/disp8
    # *out = *in
    8a/copy-byte                    0/mod/indirect  6/rm32/esi    .           .             .           3/r32/BL    .               .                 # copy byte at *esi to BL
    88/copy-byte                    0/mod/indirect  7/rm32/edi    .           .             .           3/r32/BL    .               .                 # copy byte at BL to *edi
    # ++num_bytes_buffered
    40/increment-eax
    # ++in
    46/increment-esi
    # ++out
    47/increment-edi
    eb/jump  $_buffer-4:loop/disp8
$_buffer-4:end:
    # . restore registers
    5f/pop-to-edi
    5e/pop-to-esi
    5b/pop-to-ebx
    5a/pop-to-edx
    59/pop-to-ecx
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

# idea: a clear-if-empty method on streams that clears only if f->read == f->write
# Unclear how I'd use it, though. Callers seem to need the check anyway.
# Maybe a better helper would be 'empty-stream?'

_read:  # fd: int, s: (addr stream byte) -> num-bytes-read/eax: int
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    51/push-ecx
    52/push-edx
    53/push-ebx
    56/push-esi
    # esi = s
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           6/r32/esi   0xc/disp8       .                 # copy *(ebp+12) to esi
    # eax = s->write
    8b/copy                         0/mod/indirect  6/rm32/esi    .           .             .           0/r32/eax   .               .                 # copy *esi to eax
    # edx = s->length
    8b/copy                         1/mod/*+disp8   6/rm32/esi    .           .             .           2/r32/edx   8/disp8         .                 # copy *(esi+8) to edx
    # syscall(read, fd, &s->data[s->write], s->length - s->write)
    # . . fd: ebx
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           3/r32/ebx   8/disp8         .                 # copy *(ebp+8) to ebx
    # . . data: ecx = &s->data[s->write]
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    6/base/esi  0/index/eax   .           1/r32/ecx   0xc/disp8       .                 # copy esi+eax+12 to ecx
    # . . size: edx = s->length - s->write
    29/subtract                     3/mod/direct    2/rm32/edx    .           .             .           0/r32/eax   .               .                 # subtract eax from edx
    # . . syscall
    b8/copy-to-eax  3/imm32/read
    cd/syscall  0x80/imm8
    # add the result eax to s->write
    01/add                          0/mod/indirect  6/rm32/esi    .           .             .           0/r32/eax   .               .                 # add eax to *esi
$_read:end:
    # . restore registers
    5e/pop-to-esi
    5b/pop-to-ebx
    5a/pop-to-edx
    59/pop-to-ecx
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

    # Two options:
    #   1 (what we have above):
    #     ecx = s
    #     eax = s->write
    #     edx = s->length
    #     # syscall
    #     ecx = lea ecx+eax+12
    #     edx = sub edx eax
    #
    #   2:
    #     ecx = s
    #     edx = s->length
    #     ecx = &s->data
    #     # syscall
    #     ecx = add ecx, s->write
    #     edx = sub edx, s->write
    #
    # Not much to choose between the two? Option 2 performs a duplicate load to
    # use one less register, but doesn't increase the amount of spilling (ecx
    # and edx must be used, and eax must be clobbered anyway).

# - tests

test-read-single:
    # - write a single character into _test-stream, then read from it
    # clear-stream(_test-stream)
    # . . push args
    68/push  _test-stream/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # clear-stream(_test-tmp-stream)
    # . . push args
    68/push  _test-tmp-stream/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # write(_test-stream, "Ab")
    # . . push args
    68/push  "Ab"/imm32
    68/push  _test-stream/imm32
    # . . call
    e8/call  write/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # eax = read(_test-stream, _test-tmp-stream)
    # . . push args
    68/push  _test-tmp-stream/imm32
    68/push  _test-stream/imm32
    # . . call
    e8/call  read/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 2, msg)
    # . . push args
    68/push  "F - test-read-single: return value"/imm32
    68/push  2/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # check-stream-equal(_test-tmp-stream, "Ab", msg)
    # . . push args
    68/push  "F - test-read-single"/imm32
    68/push  "Ab"/imm32
    68/push  _test-tmp-stream/imm32
    # . . call
    e8/call  check-stream-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # end
    c3/return

test-read-is-stateful:
    # - make two consecutive reads, check that their results are appended
    # clear-stream(_test-stream)
    # . . push args
    68/push  _test-stream/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # clear-stream(_test-tmp-stream)
    # . . push args
    68/push  _test-tmp-stream/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # write(_test-stream, "C")
    # . . push args
    68/push  "C"/imm32
    68/push  _test-stream/imm32
    # . . call
    e8/call  write/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # read(_test-stream, _test-tmp-stream)
    # . . push args
    68/push  _test-tmp-stream/imm32
    68/push  _test-stream/imm32
    # . . call
    e8/call  read/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # write(_test-stream, "D")
    # . . push args
    68/push  "D"/imm32
    68/push  _test-stream/imm32
    # . . call
    e8/call  write/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # read(_test-stream, _test-tmp-stream)
    # . . push args
    68/push  _test-tmp-stream/imm32
    68/push  _test-stream/imm32
    # . . call
    e8/call  read/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-stream-equal(_test-tmp-stream, "CD", msg)
    # . . push args
    68/push  "F - test-read-is-stateful"/imm32
    68/push  "CD"/imm32
    68/push  _test-tmp-stream/imm32
    # . . call
    e8/call  check-stream-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # end
    c3/return

test-read-returns-0-on-end-of-file:
    # - read after hitting end-of-file, check that result is 0
    # setup
    # . clear-stream(_test-stream)
    # . . push args
    68/push  _test-stream/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # . clear-stream(_test-tmp-stream)
    # . . push args
    68/push  _test-tmp-stream/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # . write(_test-stream, "Ab")
    # . . push args
    68/push  "Ab"/imm32
    68/push  _test-stream/imm32
    # . . call
    e8/call  write/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # first read gets to end-of-file
    # . read(_test-stream, _test-tmp-stream)
    # . . push args
    68/push  _test-tmp-stream/imm32
    68/push  _test-stream/imm32
    # . . call
    e8/call  read/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # second read
    # . read(_test-stream, _test-tmp-stream)
    # . . push args
    68/push  _test-tmp-stream/imm32
    68/push  _test-stream/imm32
    # . . call
    e8/call  read/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-read-returns-0-on-end-of-file"/imm32
    68/push  0/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # end
    c3/return

== data

_test-tmp-stream:  # (stream byte)
    # current write index
    0/imm32
    # current read index
    0/imm32
    # length
    8/imm32
    # data
    00 00 00 00 00 00 00 00  # 8 bytes

# . . vim:nowrap:textwidth=0