/
Mg.hs
618 lines (552 loc) · 18.5 KB
/
Mg.hs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
-- Copyright (c) 2005, 2008 Don Stewart - http://www.cse.unsw.edu.au/~dons
-- | An keymap that emulates @mg@, an emacs-like text editor. For more
-- information see <http://www.openbsd.org/cgi-bin/man.cgi?query=mg>
--
-- A quick summary:
--
-- > ^F Forward character
-- > ^B Backwards character
-- > ^N Next line
-- > ^P Previous line
-- > ^A Start of line
-- > ^E End of line
-- > ^D delete current character
-- > ^S interactive search forward
-- > ^R interactive search backwards
-- > ^O Open a new line at cursor position
-- > ^T transpose characters
-- > ^U Repeat next command 4 times (can be cascaded i.e. ^u^u^f will move
-- > 16 characters forward)
-- >
-- > ^K kill to end of line (placing into kill buffer)
-- > ^Y yank kill buffer into current location
-- > ^@ set mark
-- > ^W kill region (cuts from previously set mark to current location,
-- > into kill buffer)
-- > M-W copy region (into kill buffer)
-- >
-- > ^V Next page
-- > M-V Previous page
-- > M-< start of buffer
-- > M-> end of buffer
--
-- > ^X^C Quit (you will be asked if you want to save files)
-- > ^X-O Next window.
-- > ^X-N Next window.
-- > ^X-P Previous window.
-- > ^X-U Undo.
--
-- For more key bindings, type ``M-x describe-bindings''.
module Yi.Keymap.Mg (keymap) where
import Yi.Yi
import Yi.Char
import Numeric ( showOct )
import Data.Char ( ord, chr )
import Data.List ((\\), isPrefixOf)
import qualified Data.Map as M
import Control.Arrow
import Control.Exception ( try, evaluate )
import Control.Monad
import Control.Monad.Trans
import Yi.Debug
import Yi.Keymap.Emacs.Utils (findFile, isearchProcess, withMinibuffer, completeFileName)
import Yi.Keymap.Emacs.KillRing
import Yi.String (dropSpace)
------------------------------------------------------------------------
c_ :: Char -> Char
c_ = ctrlLowcase
m_ :: Char -> Char
m_ = setMeta
-- ---------------------------------------------------------------------
-- map extended names to corresponding actions
--
extended2action :: M.Map String MgMode
extended2action = M.fromList [ (ex,a) | (ex,_,a) <- globalTable ]
--
-- map keystrokes to extended names
--
keys2extended :: M.Map [Char] String
keys2extended = M.fromList [ (k,ex) | (ex,ks,_) <- globalTable, k <- ks ]
--
-- map chars to actions
--
keys2action :: [Char] -> MgMode
keys2action ks | Just ex <- M.lookup ks keys2extended
, Just a <- M.lookup ex extended2action = a
| otherwise = write $ errorEditor $ "No binding for "++ show ks
--
-- keystrokes only 1 character long
--
unitKeysList :: [Char]
unitKeysList = [ k | (_,ks,_) <- globalTable, [k] <- ks ]
--
-- C-x mappings
--
ctrlxKeysList :: [Char]
ctrlxKeysList = [ k | (_,ks,_) <- globalTable, ['\^X',k] <- ks ]
--
-- M-O mappings
--
metaoKeysList :: [Char]
metaoKeysList = [ k | (_,ks,_) <- globalTable, [m,k] <- ks, m == m_ 'O' ]
------------------------------------------------------------------------
--
-- global key/action/name map
--
globalTable :: [(String,[String],MgMode)]
globalTable = [
("apropos",
[[c_ 'h', 'a']],
write $ errorEditor "apropos unimplemented"),
("backward-char",
[[c_ 'b'], [m_ 'O', 'D'], [keyLeft]],
write $ leftB),
("backward-kill-word",
[[m_ '\127']],
write $ bkillWordB),
("backward-word",
[[m_ 'b']],
write $ prevWordB),
("beginning-of-buffer",
[[m_ '<']],
write $ topB),
("beginning-of-line",
[[c_ 'a'], [m_ 'O', 'H']],
write $ moveToSol),
("call-last-kbd-macro",
[[c_ 'x', 'e']],
write $ errorEditor "call-last-kbd-macro unimplemented"),
("capitalize-word",
[[m_ 'c']],
write $ capitaliseWordB),
("copy-region-as-kill",
[[m_ 'w']],
write $ errorEditor "copy-region-as-kill unimplemented"),
("delete-backward-char",
[['\127'], ['\BS'], [keyBackspace]],
write $ bdeleteB),
("delete-blank-lines",
[[c_ 'x', c_ 'o']],
write $ mgDeleteBlanks),
("delete-char",
[[c_ 'd']],
write $ deleteN 1),
("delete-horizontal-space",
[[m_ '\\']],
write $ mgDeleteHorizBlanks),
("delete-other-windows",
[[c_ 'x', '1']],
write $ closeOtherE),
("delete-window",
[[c_ 'x', '0']],
write $ closeWindow),
("describe-bindings",
[[c_ 'h', 'b']],
write $ describeBindings),
("describe-key-briefly",
[[c_ 'h', 'c']],
describeKeyMode),
("digit-argument",
[ [m_ d] | d <- ['0' .. '9'] ],
write $ errorEditor "digit-argument unimplemented"),
("dired",
[[c_ 'x', 'd']],
write $ errorEditor "dired unimplemented"),
("downcase-region",
[[c_ 'x', c_ 'l']],
write $ errorEditor "downcase-region unimplemented"),
("downcase-word",
[[m_ 'l']],
write $ lowercaseWordB),
("end-kbd-macro",
[[c_ 'x', ')']],
write $ errorEditor "end-kbd-macro unimplemented"),
("end-of-buffer",
[[m_ '>']],
write $ botB),
("end-of-line",
[[c_ 'e'], [m_ 'O', 'F']],
write $ moveToEol),
("enlarge-window",
[[c_ 'x', '^']],
write $ enlargeWinE),
("shrink-window", -- not in mg
[[c_ 'x', 'v']],
write $ shrinkWinE),
("exchange-point-and-mark",
[[c_ 'x', c_ 'x']],
write $ errorEditor "exchange-point-and-mark unimplemented"),
("execute-extended-command",
[[m_ 'x']],
metaXSwitch),
("fill-paragraph",
[[m_ 'q']],
write $ errorEditor "fill-paragraph unimplemented"),
("find-alternate-file",
[[c_ 'c', c_ 'v']],
write $ errorEditor "find-alternate-file unimplemented"),
("find-file",
[[c_ 'x', c_ 'f']],
findFile),
("find-file-other-window",
[[c_ 'x', '4', c_ 'f']],
write $ errorEditor "find-file-other-window unimplemented"),
("forward-char",
[[c_ 'f'], [m_ 'O', 'C'], [keyRight]],
write $ rightB),
("forward-paragraph",
[[m_ ']']],
write $ nextNParagraphs 1),
("forward-word",
[[m_ 'f']],
write $ nextWordB),
("goto-line",
[[c_ 'x', 'g']],
gotoMode),
("help-help",
[[c_ 'h', c_ 'h']],
write $ errorEditor "help-help unimplemented"),
("insert-file",
[[c_ 'x', 'i']],
write $ errorEditor "insert-file unimplemented"),
("isearch-backward",
[[c_ 'r']],
isearchProcess),
("isearch-forward",
[[c_ 's']],
isearchProcess),
("just-one-space",
[[m_ ' ']],
write $ insertN ' '),
("keyboard-quit",
[[c_ 'g'],
[c_ 'h', c_ 'g'],
[c_ 'x', c_ 'g'],
[c_ 'x', '4', c_ 'g'],
[m_ (c_ 'g')]
],
write $ msgEditor "Quit"),
("kill-buffer",
[[c_ 'x', 'k']],
killBufferMode),
("kill-line",
[[c_ 'k']],
write $ killLineE),
("kill-region",
[[c_ 'w']],
write $ errorEditor "kill-region unimplemented"),
("kill-word",
[[m_ 'd']],
write $ killWordB),
("list-buffers",
[[c_ 'x', c_ 'b']],
write $ mgListBuffers),
("negative-argument",
[[m_ '-']],
write $ errorEditor "negative-argument unimplemented"),
("newline",
[[c_ 'm']],
write $ insertN '\n'),
("newline-and-indent",
[],
write $ errorEditor "newline-and-indent unimplemented"),
("next-line",
[[c_ 'n'], [m_ 'O', 'B'], [keyDown]], -- doesn't remember goal column
write $ (execB Move VLine Forward)),
("not-modified",
[[m_ '~']],
write $ errorEditor "not-modified unimplemented"),
("open-line",
[[c_ 'o']],
write $ insertB '\n'),
("other-window",
[[c_ 'x', 'n'], [c_ 'x', 'o']],
write $ nextWinE),
("previous-line",
[[c_ 'p'], [m_ 'O', 'A'], [keyUp]],
write $ (execB Move VLine Backward)),
("previous-window",
[[c_ 'x', 'p']],
write $ prevWinE),
("query-replace",
[[m_ '%']],
write $ errorEditor "query-replace unimplemented"),
("quoted-insert",
[[c_ 'q']],
insertAnyMode),
("recenter",
[[c_ 'l']],
write $ errorEditor "recenter unimplemented"),
("save-buffer",
[[c_ 'x', c_ 's']],
write $ writeFileMode),
("save-buffers-kill-emacs",
[[c_ 'x', c_ 'c']],
write $ quitEditor), -- should ask to save buffers
("save-some-buffers",
[[c_ 'x', 's']],
write $ errorEditor "save-some-buffers unimplemented"),
("scroll-down",
[[m_ '[', '5', '~'], [m_ 'v'], [keyPPage]],
write $ upScreenB),
("scroll-other-window",
[[m_ (c_ 'v')]],
write $ errorEditor "scroll-other-window unimplemented"),
("scroll-up",
[[c_ 'v'], [m_ '[', '6', '~'], [keyNPage]],
write $ downScreenB),
("search-backward",
[[m_ 'r']],
write $ errorEditor "search-backward unimplemented"),
("search-forward",
[[m_ 's']],
write $ errorEditor "search-forward unimplemented"),
("set-fill-column",
[[c_ 'x', 'f']],
write $ errorEditor "set-fill-column unimplemented"),
("set-mark-command",
[['\NUL']],
write $ errorEditor "set-mark-command unimplemented"),
("split-window-vertically",
[[c_ 'x', '2']],
write $ splitE),
("start-kbd-macro",
[[c_ 'x', '(']],
write $ errorEditor "start-kbd-macro unimplemented"),
("suspend-emacs",
[[c_ 'z']],
write $ suspendEditor),
("switch-to-buffer",
[[c_ 'x', 'b']],
write $ errorEditor "switch-to-buffer unimplemented"),
("switch-to-buffer-other-window",
[[c_ 'x', '4', 'b']],
write $ errorEditor "switch-to-buffer-other-window unimplemented"),
("transpose-chars",
[[c_ 't']],
write $ swapB),
("undo",
[[c_ 'x', 'u'], ['\^_']],
write $ undoB),
("universal-argument",
[[c_ 'u']],
write $ errorEditor "universal-argument unimplemented"),
("upcase-region",
[[c_ 'x', c_ 'u']],
write $ errorEditor "upcase-region unimplemented"),
("upcase-word",
[[m_ 'u']],
write $ uppercaseWordB),
("what-cursor-position",
[[c_ 'x', '=']],
write $ whatCursorPos),
("write-file",
[[c_ 'x', c_ 'w']],
writeFileMode),
("yank",
[[c_ 'y']],
write $ getRegE >>= mapM_ insertN) ]
------------------------------------------------------------------------
type MgMode = Interact Char ()
keymap :: Keymap
keymap = comap eventToChar mode
------------------------------------------------------------------------
-- default bindings
mode :: MgMode
mode = command +++
ctrlxSwitch +++
metaSwitch +++
metaOSwitch +++
metaXSwitch +++ insert
------------------------------------------------------------------------
-- self insertion
insert :: MgMode
insert = do c <- satisfy (const True); write $ insertN c
-- C- commands
command :: MgMode
command = do c <- oneOf unitKeysList; keys2action [c]
------------------------------------------------------------------------
-- switch to ctrl-X submap
ctrlxSwitch :: MgMode
ctrlxSwitch = do event '\^X' ; write (msgEditor "C-x-"); ctrlxMode
-- ctrl x submap
ctrlxMode :: MgMode
ctrlxMode = do c <- oneOf ctrlxKeysList; keys2action ['\^X',c]; write msgClr
------------------------------------------------------------------------
--
-- on escape, we'd also like to switch to M- mode
--
-- switch to meta mode
metaSwitch :: MgMode
metaSwitch = do event '\ESC' ; write (msgEditor "ESC-"); metaMode -- hitting ESC also triggers a meta char
--
-- a fake mode. really just looking up the binding for: m_ c
--
metaMode :: MgMode
metaMode = do c <- oneOf ['\0' .. '\255'] -- not quite right
when ((m_ c) `elem` unitKeysList) $ keys2action [m_ c]
write msgClr
------------------------------------------------------------------------
-- switch to meta O mode
metaOSwitch :: MgMode
metaOSwitch = event (m_ 'O') >> write (msgEditor "ESC-O-") >> metaOMode
metaOMode :: MgMode
metaOMode = do c <- oneOf metaoKeysList; keys2action [m_ 'O',c]; write msgClr
-- ---------------------------------------------------------------------
-- build a generic line buffer editor, given a mode to transition to
--
echoMode :: String -> Interact Char (Maybe String)
echoMode prompt = do
write (logPutStrLn "echoMode")
result <- lineEdit []
write msgClr
return result
where lineEdit s =
do write $ msgEditor (prompt ++ s)
(do delete; lineEdit (take (length s - 1) s)
+++ do c <- anyButDelNlArrow; lineEdit (s++[c])
+++ do event '\^G'; return Nothing
+++ do enter; return (Just s))
anyButDelNlArrow = oneOf $ any' \\ (enter' ++ delete' ++ ['\ESC',keyUp,keyDown])
withLineEditor :: String -> (String -> MgMode) -> MgMode
withLineEditor prompt cont = do
s <- echoMode prompt
case s of
Nothing -> return ()
Just x -> cont x
------------------------------------------------------------------------
-- | execute an extended command
-- we ultimately map the command back to a
-- keystroke, and execute that.
metaXSwitch :: MgMode
metaXSwitch = do (event (m_ 'x') +++ event (m_ 'X')); withLineEditor "M-x " metaXEval
-- | M-x mode, evaluate a string entered after M-x
metaXEval :: String -> MgMode
metaXEval cmd = case M.lookup cmd extended2action of
Nothing -> write $ msgEditor "[No match]"
Just a -> a
-- metaXTab :: MgMode
------------------------------------------------------------------------
describeKeyMode :: MgMode
describeKeyMode = describeChar "Describe key briefly: " []
describeChar :: String -> String -> MgMode
describeChar prompt acc = do
c <- anything
let keys = acc ++ [c]
case M.lookup keys keys2extended of
Just ex -> write $ msgEditor $ (printable keys) ++ " runs the command " ++ ex
Nothing ->
-- only continue if this is the prefix of something in the table
if any (isPrefixOf keys) (M.keys keys2extended)
then do write $ msgEditor (prompt ++ keys)
describeChar prompt keys
else write $ msgEditor $ printable keys ++ " is not bound to any function"
-- ---------------------------------------------------------------------
-- | Writing a file
--
writeFileMode :: MgMode
writeFileMode = withMinibuffer "Write file: "
(completeFileName Nothing)
fwriteToE
-- ---------------------------------------------------------------------
-- | Killing a buffer by name
killBufferMode :: MgMode
killBufferMode = withLineEditor "Kill buffer: " $ \buf -> write $ do
closeBufferE buf
-- ---------------------------------------------------------------------
-- | Goto a line
--
gotoMode :: MgMode
gotoMode = withLineEditor "goto line: " $ \l -> write $ do
i <- lift $ try . evaluate . read $ l
case i of Left _ -> errorEditor "Invalid number"
Right i' -> gotoLn i'
-- | insert the first character, then switch back to normal mode
insertAnyMode :: MgMode
insertAnyMode = do c <- oneOf ['\0' .. '\255']; write (insertN c)
-- | translate a string into the Emacs encoding of that string
printable :: String -> String
printable = dropSpace . printable'
where
printable' ('\ESC':a:ta) = "M-" ++ [a] ++ printable' ta
printable' ('\ESC':ta) = "ESC " ++ printable' ta
printable' (a:ta)
| ord a < 32
= "C-" ++ [chr (ord a + 96)] ++ " " ++ printable' ta
| isMeta a
= "M-" ++ printable' (clrMeta a:ta)
| ord a >= 127
= bigChar a ++ " " ++ printable' ta
| otherwise = [a, ' '] ++ printable' ta
printable' [] = []
bigChar c
| c == keyDown = "<down"
| c == keyUp = "<up>"
| c == keyLeft = "<left>"
| c == keyRight = "<right>"
| c == keyNPage = "<pagedown>"
| c == keyPPage = "<pageup>"
| c == '\127' = "<delete>"
| otherwise = show c
------------------------------------------------------------------------
-- Mg-specific actions
whatCursorPos :: Action
whatCursorPos = do
bufInfo <- bufInfoB
let ln = bufInfoLineNo bufInfo
col = bufInfoColNo bufInfo
pt = bufInfoCharNo bufInfo
pct = bufInfoPercent bufInfo
c <- readB
msgEditor $ "Char: "++[c]++" (0"++showOct (ord c) ""++
") point="++show pt++
"("++pct++
") line="++show ln++
" row=? col="++ show col
describeBindings :: Action
describeBindings = newBufferE "*help*" s >> return ()
where
s = unlines [ let p = printable k
in p ++ replicate (17 - length p) ' ' ++ ex
| (ex,ks,_) <- globalTable
, k <- ks ]
-- bit of a hack, unfortunately
mgListBuffers :: Action
mgListBuffers = do
closeBufferE name -- close any previous buffer list buffer
newBufferE name [] -- new empty one
bs <- listBuffersE -- get current list
closeBufferE name -- close temporary one
newBufferE name (f bs) -- and finally display current one
return ()
where
name = "*Buffer List*"
f bs = unlines [ " "++(show i)++"\t"++(show n) | (n,i) <- bs ]
--
-- delete all blank lines from this point
mgDeleteBlanks :: Action
mgDeleteBlanks = do
p <- getSelectionMarkPointB
moveWhileE (== '\n') GoRight
q <- getSelectionMarkPointB
gotoPointE p
deleteNE (q - p)
-- not quite right, as it will delete, even if no blanks
mgDeleteHorizBlanks :: Action
mgDeleteHorizBlanks = do
p <- getSelectionMarkPointB
moveWhileE (\c -> c == ' ' || c == '\t') GoRight
q <- getSelectionMarkPointB
gotoPointE p
deleteNE (q - p)
------------------------------------------------------------------------
--
-- some regular expressions
any', enter', delete' :: [Char]
enter' = ['\n', '\r']
delete' = ['\BS', '\127', keyBackspace ]
any' = ['\0' .. '\255']
delete, enter, anything :: Interact Char Char
delete = oneOf delete'
enter = oneOf enter'
anything = oneOf any'