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[emacs.git] / lisp / skeleton.el
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1 ;;; skeleton.el --- Lisp language extension for writing statement skeletons
3 ;; Copyright (C) 1993, 1994, 1995, 1996 by Free Software Foundation, Inc.
5 ;; Author: Daniel Pfeiffer <occitan@esperanto.org>
6 ;; Maintainer: FSF
7 ;; Keywords: extensions, abbrev, languages, tools
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software; you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation; either version 2, or (at your option)
14 ;; any later version.
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 ;; Boston, MA 02111-1307, USA.
26 ;;; Commentary:
28 ;; A very concise language extension for writing structured statement
29 ;; skeleton insertion commands for programming language modes. This
30 ;; originated in shell-script mode and was applied to ada-mode's
31 ;; commands which shrunk to one third. And these commands are now
32 ;; user configurable.
34 ;;; Code:
36 ;; page 1: statement skeleton language definition & interpreter
37 ;; page 2: paired insertion
38 ;; page 3: mirror-mode, an example for setting up paired insertion
41 (defvar skeleton-transformation 'identity
42 "*If non-nil, function applied to literal strings before they are inserted.
43 It should take strings and characters and return them transformed, or nil
44 which means no transformation.
45 Typical examples might be `upcase' or `capitalize'.")
47 ; this should be a fourth argument to defvar
48 (put 'skeleton-transformation 'variable-interactive
49 "aTransformation function: ")
52 (defvar skeleton-autowrap t
53 "Controls wrapping behaviour of functions created with `define-skeleton'.
54 When the region is visible (due to `transient-mark-mode' or marking a region
55 with the mouse) and this is non-`nil' and the function was called without an
56 explicit ARG, then the ARG defaults to -1, i.e. wrapping around the visible
57 region.
59 We will probably delete this variable in a future Emacs version
60 unless we get a substantial number of complaints about the auto-wrap
61 feature.")
63 (defvar skeleton-end-newline t
64 "If non-nil, make sure that the skeleton inserted ends with a newline.
65 This just influences the way the default `skeleton-end-hook' behaves.")
67 (defvar skeleton-end-hook
68 (lambda ()
69 (or (eolp) (not skeleton-end-newline) (newline-and-indent)))
70 "Hook called at end of skeleton but before going to point of interest.
71 By default this moves out anything following to next line,
72 unless `skeleton-end-newline' is set to nil.
73 The variables `v1' and `v2' are still set when calling this.")
76 ;;;###autoload
77 (defvar skeleton-filter 'identity
78 "Function for transforming a skeleton proxy's aliases' variable value.")
80 (defvar skeleton-untabify t
81 "When non-`nil' untabifies when deleting backwards with element -ARG.")
83 (defvar skeleton-newline-indent-rigidly nil
84 "When non-`nil', indent rigidly under current line for element `\\n'.
85 Else use mode's `indent-line-function'.")
87 (defvar skeleton-further-elements ()
88 "A buffer-local varlist (see `let') of mode specific skeleton elements.
89 These variables are bound while interpreting a skeleton. Their value may
90 in turn be any valid skeleton element if they are themselves to be used as
91 skeleton elements.")
92 (make-variable-buffer-local 'skeleton-further-elements)
95 (defvar skeleton-subprompt
96 (substitute-command-keys
97 "RET, \\<minibuffer-local-map>\\[abort-recursive-edit] or \\[help-command]")
98 "*Replacement for %s in prompts of recursive subskeletons.")
101 (defvar skeleton-abbrev-cleanup nil
102 "Variable used to delete the character that led to abbrev expansion.")
105 (defvar skeleton-debug nil
106 "*If non-nil `define-skeleton' will override previous definition.")
108 (defvar skeleton-positions nil
109 "List of positions marked with @, after skeleton insertion.
110 The list describes the most recent skeleton insertion, and its elements
111 are integer buffer positions in the reverse order of the insertion order.")
113 ;; reduce the number of compiler warnings
114 (defvar skeleton)
115 (defvar skeleton-modified)
116 (defvar skeleton-point)
117 (defvar skeleton-regions)
119 ;;;###autoload
120 (defmacro define-skeleton (command documentation &rest skeleton)
121 "Define a user-configurable COMMAND that enters a statement skeleton.
122 DOCUMENTATION is that of the command, while the variable of the same name,
123 which contains the skeleton, has a documentation to that effect.
124 INTERACTOR and ELEMENT ... are as defined under `skeleton-insert'."
125 (if skeleton-debug
126 (set command skeleton))
127 `(progn
128 (defun ,command (&optional str arg)
129 ,(concat documentation
130 (if (string-match "\n\\>" documentation)
131 "" "\n")
132 "\n"
133 "This is a skeleton command (see `skeleton-insert').
134 Normally the skeleton text is inserted at point, with nothing \"inside\".
135 If there is a highlighted region, the skeleton text is wrapped
136 around the region text.
138 A prefix argument ARG says to wrap the skeleton around the next ARG words.
139 A prefix argument of -1 says to wrap around region, even if not highlighted.
140 A prefix argument of zero says to wrap around zero words---that is, nothing.
141 This is a way of overriding the use of a highlighted region.")
142 (interactive "*P\nP")
143 (skeleton-proxy-new ',skeleton str arg))))
145 ;;;###autoload
146 (defun skeleton-proxy-new (skeleton &optional str arg)
147 "Insert skeleton defined by variable of same name (see `skeleton-insert').
148 Prefix ARG allows wrapping around words or regions (see `skeleton-insert').
149 If no ARG was given, but the region is visible, ARG defaults to -1 depending
150 on `skeleton-autowrap'. An ARG of M-0 will prevent this just for once.
151 This command can also be an abbrev expansion (3rd and 4th columns in
152 \\[edit-abbrevs] buffer: \"\" command-name).
154 When called as a function, optional first argument STR may also be a string
155 which will be the value of `str' whereas the skeleton's interactor is then
156 ignored."
157 (interactive "*P\nP")
158 (setq skeleton (funcall skeleton-filter skeleton))
159 (if (not skeleton)
160 (if (memq this-command '(self-insert-command
161 skeleton-pair-insert-maybe
162 expand-abbrev))
163 (setq buffer-undo-list (primitive-undo 1 buffer-undo-list)))
164 (skeleton-insert skeleton
165 (if (setq skeleton-abbrev-cleanup
166 (or (eq this-command 'self-insert-command)
167 (eq this-command
168 'skeleton-pair-insert-maybe)))
170 ;; Pretend C-x a e passed its prefix arg to us
171 (if (or arg current-prefix-arg)
172 (prefix-numeric-value (or arg
173 current-prefix-arg))
174 (and skeleton-autowrap
175 (or (eq last-command 'mouse-drag-region)
176 (and transient-mark-mode mark-active))
177 -1)))
178 (if (stringp str)
179 str))
180 (and skeleton-abbrev-cleanup
181 (setq skeleton-abbrev-cleanup (point))
182 (add-hook 'post-command-hook 'skeleton-abbrev-cleanup nil t))))
184 ;; This command isn't meant to be called, only its aliases with meaningful
185 ;; names are.
186 ;;;###autoload
187 (defun skeleton-proxy (&optional str arg)
188 "Insert skeleton defined by variable of same name (see `skeleton-insert').
189 Prefix ARG allows wrapping around words or regions (see `skeleton-insert').
190 If no ARG was given, but the region is visible, ARG defaults to -1 depending
191 on `skeleton-autowrap'. An ARG of M-0 will prevent this just for once.
192 This command can also be an abbrev expansion (3rd and 4th columns in
193 \\[edit-abbrevs] buffer: \"\" command-name).
195 When called as a function, optional first argument STR may also be a string
196 which will be the value of `str' whereas the skeleton's interactor is then
197 ignored."
198 (interactive "*P\nP")
199 (let ((function (nth 1 (backtrace-frame 1))))
200 (if (eq function 'nth) ; uncompiled Lisp function
201 (setq function (nth 1 (backtrace-frame 5)))
202 (if (eq function 'byte-code) ; tracing byte-compiled function
203 (setq function (nth 1 (backtrace-frame 2)))))
204 (if (not (setq function (funcall skeleton-filter (symbol-value function))))
205 (if (memq this-command '(self-insert-command
206 skeleton-pair-insert-maybe
207 expand-abbrev))
208 (setq buffer-undo-list (primitive-undo 1 buffer-undo-list)))
209 (skeleton-insert function
210 (if (setq skeleton-abbrev-cleanup
211 (or (eq this-command 'self-insert-command)
212 (eq this-command
213 'skeleton-pair-insert-maybe)))
215 ;; Pretend C-x a e passed its prefix arg to us
216 (if (or arg current-prefix-arg)
217 (prefix-numeric-value (or arg
218 current-prefix-arg))
219 (and skeleton-autowrap
220 (or (eq last-command 'mouse-drag-region)
221 (and transient-mark-mode mark-active))
222 -1)))
223 (if (stringp str)
224 str))
225 (and skeleton-abbrev-cleanup
226 (setq skeleton-abbrev-cleanup (point))
227 (add-hook 'post-command-hook 'skeleton-abbrev-cleanup nil t)))))
230 (defun skeleton-abbrev-cleanup (&rest list)
231 "Value for `post-command-hook' to remove char that expanded abbrev."
232 (if (integerp skeleton-abbrev-cleanup)
233 (progn
234 (delete-region skeleton-abbrev-cleanup (point))
235 (setq skeleton-abbrev-cleanup)
236 (remove-hook 'post-command-hook 'skeleton-abbrev-cleanup t))))
239 ;;;###autoload
240 (defun skeleton-insert (skeleton &optional regions str)
241 "Insert the complex statement skeleton SKELETON describes very concisely.
243 With optional second argument REGIONS, wrap first interesting point
244 \(`_') in skeleton around next REGIONS words, if REGIONS is positive.
245 If REGIONS is negative, wrap REGIONS preceding interregions into first
246 REGIONS interesting positions \(successive `_'s) in skeleton.
248 An interregion is the stretch of text between two contiguous marked
249 points. If you marked A B C [] (where [] is the cursor) in
250 alphabetical order, the 3 interregions are simply the last 3 regions.
251 But if you marked B A [] C, the interregions are B-A, A-[], []-C.
253 The optional third argument STR, if specified, is the value for the
254 variable `str' within the skeleton. When this is non-nil, the
255 interactor gets ignored, and this should be a valid skeleton element.
257 SKELETON is made up as (INTERACTOR ELEMENT ...). INTERACTOR may be nil if
258 not needed, a prompt-string or an expression for complex read functions.
260 If ELEMENT is a string or a character it gets inserted (see also
261 `skeleton-transformation'). Other possibilities are:
263 \\n go to next line and indent according to mode
264 _ interesting point, interregion here
265 > indent line (or interregion if > _) according to major mode
266 @ add position to `skeleton-positions'
267 & do next ELEMENT iff previous moved point
268 | do next ELEMENT iff previous didn't move point
269 -num delete num preceding characters (see `skeleton-untabify')
270 resume: skipped, continue here if quit is signaled
271 nil skipped
273 After termination, point will be positioned at the first occurrence
274 of _ or @ or at the end of the inserted text.
276 Further elements can be defined via `skeleton-further-elements'. ELEMENT may
277 itself be a SKELETON with an INTERACTOR. The user is prompted repeatedly for
278 different inputs. The SKELETON is processed as often as the user enters a
279 non-empty string. \\[keyboard-quit] terminates skeleton insertion, but
280 continues after `resume:' and positions at `_' if any. If INTERACTOR in such
281 a subskeleton is a prompt-string which contains a \".. %s ..\" it is
282 formatted with `skeleton-subprompt'. Such an INTERACTOR may also be a list of
283 strings with the subskeleton being repeated once for each string.
285 Quoted Lisp expressions are evaluated for their side-effects.
286 Other Lisp expressions are evaluated and the value treated as above.
287 Note that expressions may not return `t' since this implies an
288 endless loop. Modes can define other symbols by locally setting them
289 to any valid skeleton element. The following local variables are
290 available:
292 str first time: read a string according to INTERACTOR
293 then: insert previously read string once more
294 help help-form during interaction with the user or `nil'
295 input initial input (string or cons with index) while reading str
296 v1, v2 local variables for memorizing anything you want
298 When done with skeleton, but before going back to `_'-point call
299 `skeleton-end-hook' if that is non-`nil'."
300 (let ((skeleton-regions regions))
301 (and skeleton-regions
302 (setq skeleton-regions
303 (if (> skeleton-regions 0)
304 (list (copy-marker (point) t)
305 (save-excursion (forward-word skeleton-regions)
306 (point-marker)))
307 (setq skeleton-regions (- skeleton-regions))
308 ;; copy skeleton-regions - 1 elements from `mark-ring'
309 (let ((l1 (cons (mark-marker) mark-ring))
310 (l2 (list (copy-marker (point) t))))
311 (while (and l1 (> skeleton-regions 0))
312 (push (copy-marker (pop l1) t) l2)
313 (setq skeleton-regions (1- skeleton-regions)))
314 (sort l2 '<))))
315 (goto-char (car skeleton-regions))
316 (setq skeleton-regions (cdr skeleton-regions)))
317 (let ((beg (point))
318 skeleton-modified skeleton-point resume: help input v1 v2)
319 (setq skeleton-positions nil)
320 (unwind-protect
321 (eval `(let ,skeleton-further-elements
322 (skeleton-internal-list skeleton str)))
323 (run-hooks 'skeleton-end-hook)
324 (sit-for 0)
325 (or (pos-visible-in-window-p beg)
326 (progn
327 (goto-char beg)
328 (recenter 0)))
329 (if skeleton-point
330 (goto-char skeleton-point))))))
332 (defun skeleton-read (prompt &optional initial-input recursive)
333 "Function for reading a string from the minibuffer within skeletons.
335 PROMPT must be a string or a form that evaluates to a string.
336 It may contain a `%s' which will be replaced by `skeleton-subprompt'.
337 If non-`nil' second arg INITIAL-INPUT or variable `input' is a string or
338 cons with index to insert before reading. If third arg RECURSIVE is non-`nil'
339 i.e. we are handling the iterator of a subskeleton, returns empty string if
340 user didn't modify input.
341 While reading, the value of `minibuffer-help-form' is variable `help' if that
342 is non-nil or a default string."
343 (let ((minibuffer-help-form (or (if (boundp 'help) (symbol-value 'help))
344 (if recursive "\
345 As long as you provide input you will insert another subskeleton.
347 If you enter the empty string, the loop inserting subskeletons is
348 left, and the current one is removed as far as it has been entered.
350 If you quit, the current subskeleton is removed as far as it has been
351 entered. No more of the skeleton will be inserted, except maybe for a
352 syntactically necessary termination."
354 You are inserting a skeleton. Standard text gets inserted into the buffer
355 automatically, and you are prompted to fill in the variable parts.")))
356 (eolp (eolp)))
357 ;; since Emacs doesn't show main window's cursor, do something noticeable
358 (or eolp
359 (open-line 1))
360 (unwind-protect
361 (setq prompt (if (stringp prompt)
362 (read-string (format prompt skeleton-subprompt)
363 (setq initial-input
364 (or initial-input
365 (symbol-value 'input))))
366 (eval prompt)))
367 (or eolp
368 (delete-char 1))))
369 (if (and recursive
370 (or (null prompt)
371 (string= prompt "")
372 (equal prompt initial-input)
373 (equal prompt (car-safe initial-input))))
374 (signal 'quit t)
375 prompt))
377 (defun skeleton-internal-list (skeleton &optional str recursive)
378 (let* ((start (save-excursion (beginning-of-line) (point)))
379 (column (current-column))
380 (line (buffer-substring start (line-end-position)))
381 opoint)
382 (or str
383 (setq str `(setq str (skeleton-read ',(car skeleton) nil ,recursive))))
384 (when (and (eq (cadr skeleton) '\n) (not recursive)
385 (save-excursion (skip-chars-backward " \t") (bolp)))
386 (setq skeleton (cons nil (cons '> (cddr skeleton)))))
387 (while (setq skeleton-modified (eq opoint (point))
388 opoint (point)
389 skeleton (cdr skeleton))
390 (condition-case quit
391 (skeleton-internal-1 (car skeleton))
392 (quit
393 (if (eq (cdr quit) 'recursive)
394 (setq recursive 'quit
395 skeleton (memq 'resume: skeleton))
396 ;; Remove the subskeleton as far as it has been shown
397 ;; the subskeleton shouldn't have deleted outside current line.
398 (end-of-line)
399 (delete-region start (point))
400 (insert line)
401 (move-to-column column)
402 (if (cdr quit)
403 (setq skeleton ()
404 recursive nil)
405 (signal 'quit 'recursive)))))))
406 ;; maybe continue loop or go on to next outer resume: section
407 (if (eq recursive 'quit)
408 (signal 'quit 'recursive)
409 recursive))
411 (defun skeleton-internal-1 (element &optional literal)
412 (cond
413 ((char-or-string-p element)
414 (if (and (integerp element) ; -num
415 (< element 0))
416 (if skeleton-untabify
417 (backward-delete-char-untabify (- element))
418 (delete-backward-char (- element)))
419 (insert (if (and skeleton-transformation
420 (not literal))
421 (funcall skeleton-transformation element)
422 element))))
423 ((or (eq element '\n) ; actually (eq '\n 'n)
424 ;; The sequence `> \n' is handled specially so as to indent the first
425 ;; line after inserting the newline (to get the proper indentation).
426 (and (eq element '>) (eq (nth 1 skeleton) '\n) (pop skeleton)))
427 (let ((pos (if (eq element '>) (point))))
428 (cond
429 ((and skeleton-regions (eq (nth 1 skeleton) '_))
430 (or (eolp) (newline))
431 (if pos (save-excursion (goto-char pos) (indent-according-to-mode)))
432 (indent-region (line-beginning-position)
433 (car skeleton-regions) nil))
434 ;; \n as last element only inserts \n if not at eol.
435 ((and (null (cdr skeleton)) (not recursive) (eolp))
436 (if pos (indent-according-to-mode)))
437 (skeleton-newline-indent-rigidly
438 (let ((pt (point)))
439 (newline)
440 (indent-to (save-excursion
441 (goto-char pt)
442 (if pos (indent-according-to-mode))
443 (current-indentation)))))
444 (t (if pos (reindent-then-newline-and-indent)
445 (newline)
446 (indent-according-to-mode))))))
447 ((eq element '>)
448 (if (and skeleton-regions (eq (nth 1 skeleton) '_))
449 (indent-region (line-beginning-position)
450 (car skeleton-regions) nil)
451 (indent-according-to-mode)))
452 ((eq element '_)
453 (if skeleton-regions
454 (progn
455 (goto-char (pop skeleton-regions))
456 (and (<= (current-column) (current-indentation))
457 (eq (nth 1 skeleton) '\n)
458 (end-of-line 0)))
459 (or skeleton-point
460 (setq skeleton-point (point)))))
461 ((eq element '&)
462 (when skeleton-modified (pop skeleton)))
463 ((eq element '|)
464 (unless skeleton-modified (pop skeleton)))
465 ((eq element '@)
466 (push (point) skeleton-positions)
467 (unless skeleton-point (setq skeleton-point (point))))
468 ((eq 'quote (car-safe element))
469 (eval (nth 1 element)))
470 ((or (stringp (car-safe element))
471 (consp (car-safe element)))
472 (if (symbolp (car-safe (car element)))
473 (while (skeleton-internal-list element nil t))
474 (setq literal (car element))
475 (while literal
476 (skeleton-internal-list element (car literal))
477 (setq literal (cdr literal)))))
478 ((null element))
479 (t (skeleton-internal-1 (eval element) t))))
481 ;; Maybe belongs into simple.el or elsewhere
482 ;; ;;;###autoload
483 ;; (define-skeleton local-variables-section
484 ;; "Insert a local variables section. Use current comment syntax if any."
485 ;; (completing-read "Mode: " obarray
486 ;; (lambda (symbol)
487 ;; (if (commandp symbol)
488 ;; (string-match "-mode$" (symbol-name symbol))))
489 ;; t)
490 ;; '(save-excursion
491 ;; (if (re-search-forward page-delimiter nil t)
492 ;; (error "Not on last page")))
493 ;; comment-start "Local Variables:" comment-end \n
494 ;; comment-start "mode: " str
495 ;; & -5 | '(kill-line 0) & -1 | comment-end \n
496 ;; ( (completing-read (format "Variable, %s: " skeleton-subprompt)
497 ;; obarray
498 ;; (lambda (symbol)
499 ;; (or (eq symbol 'eval)
500 ;; (user-variable-p symbol)))
501 ;; t)
502 ;; comment-start str ": "
503 ;; (read-from-minibuffer "Expression: " nil read-expression-map nil
504 ;; 'read-expression-history) | _
505 ;; comment-end \n)
506 ;; resume:
507 ;; comment-start "End:" comment-end \n)
509 ;; Variables and command for automatically inserting pairs like () or "".
511 (defvar skeleton-pair nil
512 "*If this is nil pairing is turned off, no matter what else is set.
513 Otherwise modes with `skeleton-pair-insert-maybe' on some keys
514 will attempt to insert pairs of matching characters.")
517 (defvar skeleton-pair-on-word nil
518 "*If this is nil, paired insertion is inhibited before or inside a word.")
521 (defvar skeleton-pair-filter (lambda () nil)
522 "Attempt paired insertion if this function returns nil, before inserting.
523 This allows for context-sensitive checking whether pairing is appropriate.")
526 (defvar skeleton-pair-alist ()
527 "An override alist of pairing partners matched against `last-command-char'.
528 Each alist element, which looks like (ELEMENT ...), is passed to
529 `skeleton-insert' with no interactor. Variable `str' does nothing.
531 Elements might be (?` ?` _ \"''\"), (?\\( ? _ \" )\") or (?{ \\n > _ \\n ?} >).")
534 ;;;###autoload
535 (defun skeleton-pair-insert-maybe (arg)
536 "Insert the character you type ARG times.
538 With no ARG, if `skeleton-pair' is non-nil, pairing can occur. If the region
539 is visible the pair is wrapped around it depending on `skeleton-autowrap'.
540 Else, if `skeleton-pair-on-word' is non-nil or we are not before or inside a
541 word, and if `skeleton-pair-filter' returns nil, pairing is performed.
542 Pairing is also prohibited if we are right after a quoting character
543 such as backslash.
545 If a match is found in `skeleton-pair-alist', that is inserted, else
546 the defaults are used. These are (), [], {}, <> and `' for the
547 symmetrical ones, and the same character twice for the others."
548 (interactive "*P")
549 (let ((mark (and skeleton-autowrap
550 (or (eq last-command 'mouse-drag-region)
551 (and transient-mark-mode mark-active))))
552 (skeleton-end-hook))
553 (if (or arg
554 (not skeleton-pair)
555 (memq (char-syntax (preceding-char)) '(?\\ ?/))
556 (and (not mark)
557 (or overwrite-mode
558 (if (not skeleton-pair-on-word) (looking-at "\\w"))
559 (funcall skeleton-pair-filter))))
560 (self-insert-command (prefix-numeric-value arg))
561 (setq last-command-char (logand last-command-char 255))
562 (or skeleton-abbrev-cleanup
563 (skeleton-insert
564 (cons nil (or (assq last-command-char skeleton-pair-alist)
565 (assq last-command-char '((?( _ ?))
566 (?[ _ ?])
567 (?{ _ ?})
568 (?< _ ?>)
569 (?` _ ?')))
570 `(,last-command-char _ ,last-command-char)))
571 (if mark -1))))))
574 ;; A more serious example can be found in sh-script.el
575 ;;; (defun mirror-mode ()
576 ;; "This major mode is an amusing little example of paired insertion.
577 ;;All printable characters do a paired self insert, while the other commands
578 ;;work normally."
579 ;; (interactive)
580 ;; (kill-all-local-variables)
581 ;; (make-local-variable 'skeleton-pair)
582 ;; (make-local-variable 'skeleton-pair-on-word)
583 ;; (make-local-variable 'skeleton-pair-filter)
584 ;; (make-local-variable 'skeleton-pair-alist)
585 ;; (setq major-mode 'mirror-mode
586 ;; mode-name "Mirror"
587 ;; skeleton-pair-on-word t
588 ;; ;; in the middle column insert one or none if odd window-width
589 ;; skeleton-pair-filter (lambda ()
590 ;; (if (>= (current-column)
591 ;; (/ (window-width) 2))
592 ;; ;; insert both on next line
593 ;; (next-line 1)
594 ;; ;; insert one or both?
595 ;; (= (* 2 (1+ (current-column)))
596 ;; (window-width))))
597 ;; ;; mirror these the other way round as well
598 ;; skeleton-pair-alist '((?) _ ?()
599 ;; (?] _ ?[)
600 ;; (?} _ ?{)
601 ;; (?> _ ?<)
602 ;; (?/ _ ?\\)
603 ;; (?\\ _ ?/)
604 ;; (?` ?` _ "''")
605 ;; (?' ?' _ "``"))
606 ;; ;; in this mode we exceptionally ignore the user, else it's no fun
607 ;; skeleton-pair t)
608 ;; (let ((map (make-vector 256 'skeleton-pair-insert-maybe))
609 ;; (i 0))
610 ;; (use-local-map `(keymap ,map))
611 ;; (while (< i ? )
612 ;; (aset map i nil)
613 ;; (aset map (+ i 128) nil)
614 ;; (setq i (1+ i))))
615 ;; (run-hooks 'mirror-mode-hook))
617 (provide 'skeleton)
619 ;;; skeleton.el ends here