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5a79736d RS |
1 | ;;; info-look.el --- major-mode-sensitive Info index lookup facility. |
2 | ;; An older version of this was known as libc.el. | |
3 | ||
d2c2b883 | 4 | ;; Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc. |
5a79736d RS |
5 | |
6 | ;; Author: Ralph Schleicher <rs@purple.UL.BaWue.DE> | |
ba20f077 | 7 | ;; Maintainers: FSF (unless Schleicher can be found) |
5a79736d RS |
8 | ;; Keywords: help languages |
9 | ||
10 | ;; This file is part of GNU Emacs. | |
11 | ||
12 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
13 | ;; it under the terms of the GNU General Public License as published by | |
14 | ;; the Free Software Foundation; either version 2, or (at your option) | |
15 | ;; any later version. | |
16 | ||
17 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;; GNU General Public License for more details. | |
21 | ||
22 | ;; You should have received a copy of the GNU General Public License | |
23 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
24 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
25 | ;; Boston, MA 02111-1307, USA. | |
26 | ||
27 | ;;; Code: | |
28 | ||
29 | (require 'info) | |
d2c2b883 RS |
30 | (eval-and-compile |
31 | (condition-case nil | |
32 | (require 'custom) | |
33 | (error | |
34 | (defmacro defgroup (&rest arg) | |
35 | nil) | |
36 | (defmacro defcustom (symbol value doc &rest arg) | |
37 | `(defvar ,symbol ,value ,doc ,@arg))))) | |
38 | ||
39 | (defgroup info-lookup nil | |
40 | "Major mode sensitive help agent." | |
41 | :group 'help :group 'languages) | |
5a79736d RS |
42 | |
43 | (defvar info-lookup-mode nil | |
d2c2b883 RS |
44 | "Symbol of the current buffer's help mode. |
45 | Help is provided according to the buffer's major mode if value is nil. | |
5a79736d RS |
46 | Automatically becomes buffer local when set in any fashion.") |
47 | (make-variable-buffer-local 'info-lookup-mode) | |
48 | ||
d2c2b883 RS |
49 | (defcustom info-lookup-other-window-flag t |
50 | "Non-nil means pop up the Info buffer in another window." | |
51 | :group 'info-lookup :type 'boolean) | |
5a79736d | 52 | |
d2c2b883 RS |
53 | (defcustom info-lookup-highlight-face 'highlight |
54 | "Face for highlighting looked up help items. | |
55 | Setting this variable to nil disables highlighting." | |
56 | :group 'info-lookup :type 'face) | |
5a79736d RS |
57 | |
58 | (defvar info-lookup-highlight-overlay nil | |
59 | "Overlay object used for highlighting.") | |
60 | ||
9d37318d KH |
61 | (defcustom info-lookup-file-name-alist |
62 | '(("\\`configure\\.in\\'" . autoconf-mode) | |
63 | ("\\`aclocal\\.m4\\'" . autoconf-mode) | |
64 | ("\\`acsite\\.m4\\'" . autoconf-mode) | |
65 | ("\\`acinclude\\.m4\\'" . autoconf-mode)) | |
66 | "Alist of file names handled specially. | |
67 | List elements are cons cells of the form | |
68 | ||
69 | (REGEXP . MODE) | |
70 | ||
71 | If a file name matches REGEXP, then use help mode MODE instead of the | |
72 | buffer's major mode." | |
73 | :group 'info-lookup :type '(repeat (cons (string :tag "Regexp") | |
74 | (symbol :tag "Mode")))) | |
75 | ||
5a79736d RS |
76 | (defvar info-lookup-history nil |
77 | "History of previous input lines.") | |
78 | ||
d2c2b883 RS |
79 | (defvar info-lookup-alist nil |
80 | "Alist of known help topics. | |
5a79736d RS |
81 | Cons cells are of the form |
82 | ||
d2c2b883 | 83 | (HELP-TOPIC . HELP-DATA) |
5a79736d RS |
84 | |
85 | HELP-TOPIC is the symbol of a help topic. | |
d2c2b883 | 86 | HELP-DATA is a HELP-TOPIC's public data set. |
5a79736d RS |
87 | Value is an alist with elements of the form |
88 | ||
89 | (HELP-MODE REGEXP IGNORE-CASE DOC-SPEC PARSE-RULE OTHER-MODES) | |
90 | ||
91 | HELP-MODE is a mode's symbol. | |
92 | REGEXP is a regular expression matching those help items whose | |
93 | documentation can be looked up via DOC-SPEC. | |
94 | IGNORE-CASE is non-nil if help items are case insensitive. | |
95 | DOC-SPEC is a list of documentation specifications of the form | |
96 | ||
97 | (INFO-NODE TRANS-FUNC PREFIX SUFFIX) | |
98 | ||
99 | INFO-NODE is the name (including file name part) of an Info index. | |
100 | TRANS-FUNC is a function translating index entries into help items; | |
101 | nil means add only those index entries matching REGEXP, a string | |
102 | means prepend string to the first word of all index entries. | |
103 | PREFIX and SUFFIX are parts of a regular expression. If one of | |
104 | them is non-nil then search the help item's Info node for the | |
105 | first occurrence of the regular expression `PREFIX ITEM SUFFIX'. | |
106 | ITEM will be highlighted with `info-lookup-highlight-face' if this | |
107 | variable is not nil. | |
108 | PARSE-RULE is either the symbol name of a function or a regular | |
109 | expression for guessing the default help item at point. Fuzzy | |
110 | regular expressions like \"[_a-zA-Z0-9]+\" do a better job if | |
111 | there are no clear delimiters; do not try to write too complex | |
112 | expressions. PARSE-RULE defaults to REGEXP. | |
113 | OTHER-MODES is a list of cross references to other help modes.") | |
114 | ||
115 | (defsubst info-lookup->topic-value (topic) | |
d2c2b883 | 116 | (cdr (assoc topic info-lookup-alist))) |
5a79736d RS |
117 | |
118 | (defsubst info-lookup->mode-value (topic mode) | |
119 | (assoc mode (info-lookup->topic-value topic))) | |
120 | ||
121 | (defsubst info-lookup->regexp (topic mode) | |
122 | (nth 1 (info-lookup->mode-value topic mode))) | |
123 | ||
124 | (defsubst info-lookup->ignore-case (topic mode) | |
125 | (nth 2 (info-lookup->mode-value topic mode))) | |
126 | ||
127 | (defsubst info-lookup->doc-spec (topic mode) | |
128 | (nth 3 (info-lookup->mode-value topic mode))) | |
129 | ||
130 | (defsubst info-lookup->parse-rule (topic mode) | |
131 | (nth 4 (info-lookup->mode-value topic mode))) | |
132 | ||
133 | (defsubst info-lookup->other-modes (topic mode) | |
134 | (nth 5 (info-lookup->mode-value topic mode))) | |
135 | ||
d2c2b883 RS |
136 | (eval-and-compile |
137 | (mapcar (lambda (keyword) | |
138 | (or (boundp keyword) | |
139 | (set keyword keyword))) | |
140 | '(:topic :mode :regexp :ignore-case | |
141 | :doc-spec :parse-rule :other-modes))) | |
142 | ||
143 | (defun info-lookup-add-help (&rest arg) | |
144 | "Add or update a help specification. | |
145 | Function arguments are one or more options of the form | |
146 | ||
147 | KEYWORD ARGUMENT | |
148 | ||
149 | KEYWORD is either `:topic', `:mode', `:regexp', `:ignore-case', | |
150 | `:doc-spec', `:parse-rule', or `:other-modes'. | |
151 | ARGUMENT has a value as explained in the documentation of the | |
152 | variable `info-lookup-alist'. | |
153 | ||
154 | If no topic or mode option has been specified, then the help topic defaults | |
155 | to `symbol', and the help mode defaults to the current major mode." | |
156 | (apply 'info-lookup-add-help* nil arg)) | |
157 | ||
158 | (defun info-lookup-maybe-add-help (&rest arg) | |
159 | "Add a help specification iff no one is defined. | |
160 | See the documentation of the function `info-lookup-add-help' | |
161 | for more details." | |
162 | (apply 'info-lookup-add-help* t arg)) | |
163 | ||
164 | (defun info-lookup-add-help* (maybe &rest arg) | |
165 | (let (topic mode regexp ignore-case doc-spec | |
166 | parse-rule other-modes keyword value) | |
167 | (setq topic 'symbol | |
168 | mode major-mode | |
169 | regexp "\\w+") | |
170 | (while arg | |
171 | (setq keyword (car arg)) | |
172 | (or (symbolp keyword) | |
173 | (error "Junk in argument list \"%S\"" arg)) | |
174 | (setq arg (cdr arg)) | |
175 | (and (null arg) | |
176 | (error "Keyword \"%S\" is missing an argument" keyword)) | |
177 | (setq value (car arg) | |
178 | arg (cdr arg)) | |
179 | (cond ((eq keyword :topic) | |
180 | (setq topic value)) | |
181 | ((eq keyword :mode) | |
182 | (setq mode value)) | |
183 | ((eq keyword :regexp) | |
184 | (setq regexp value)) | |
185 | ((eq keyword :ignore-case) | |
186 | (setq ignore-case value)) | |
187 | ((eq keyword :doc-spec) | |
188 | (setq doc-spec value)) | |
189 | ((eq keyword :parse-rule) | |
190 | (setq parse-rule value)) | |
191 | ((eq keyword :other-modes) | |
192 | (setq other-modes value)) | |
193 | (t | |
194 | (error "Unknown keyword \"%S\"" keyword)))) | |
195 | (or (and maybe (info-lookup->mode-value topic mode)) | |
196 | (let* ((data (list regexp ignore-case doc-spec parse-rule other-modes)) | |
197 | (topic-cell (or (assoc topic info-lookup-alist) | |
198 | (car (setq info-lookup-alist | |
199 | (cons (cons topic nil) | |
200 | info-lookup-alist))))) | |
201 | (mode-cell (assoc mode topic-cell))) | |
202 | (if (null mode-cell) | |
203 | (setcdr topic-cell (cons (cons mode data) (cdr topic-cell))) | |
204 | (setcdr mode-cell data)))) | |
205 | nil)) | |
206 | ||
5a79736d RS |
207 | (defvar info-lookup-cache nil |
208 | "Cache storing data maintained automatically by the program. | |
209 | Value is an alist with cons cell of the form | |
210 | ||
211 | (HELP-TOPIC . ((HELP-MODE INITIALIZED COMPLETIONS REFER-MODES) ...)) | |
212 | ||
213 | HELP-TOPIC is the symbol of a help topic. | |
214 | HELP-MODE is a mode's symbol. | |
215 | INITIALIZED is nil if HELP-MODE is uninitialized, t if | |
216 | HELP-MODE is initialized, and `0' means HELP-MODE is | |
217 | initialized but void. | |
218 | COMPLETIONS is an alist of documented help items. | |
219 | REFER-MODES is a list of other help modes to use.") | |
220 | ||
221 | (defsubst info-lookup->cache (topic) | |
222 | (or (assoc topic info-lookup-cache) | |
223 | (car (setq info-lookup-cache | |
224 | (cons (cons topic nil) | |
225 | info-lookup-cache))))) | |
226 | ||
0c10ee28 | 227 | (defun info-lookup->topic-cache (topic) |
5a79736d RS |
228 | (cdr (info-lookup->cache topic))) |
229 | ||
0c10ee28 | 230 | (defun info-lookup->mode-cache (topic mode) |
5a79736d RS |
231 | (assoc mode (info-lookup->topic-cache topic))) |
232 | ||
0c10ee28 | 233 | (defun info-lookup->initialized (topic mode) |
5a79736d RS |
234 | (nth 1 (info-lookup->mode-cache topic mode))) |
235 | ||
0c10ee28 | 236 | (defun info-lookup->completions (topic mode) |
5a79736d RS |
237 | (or (info-lookup->initialized topic mode) |
238 | (info-lookup-setup-mode topic mode)) | |
239 | (nth 2 (info-lookup->mode-cache topic mode))) | |
240 | ||
0c10ee28 | 241 | (defun info-lookup->refer-modes (topic mode) |
5a79736d RS |
242 | (or (info-lookup->initialized topic mode) |
243 | (info-lookup-setup-mode topic mode)) | |
244 | (nth 3 (info-lookup->mode-cache topic mode))) | |
245 | ||
0c10ee28 | 246 | (defun info-lookup->all-modes (topic mode) |
5a79736d RS |
247 | (cons mode (info-lookup->refer-modes topic mode))) |
248 | ||
0c10ee28 RS |
249 | (defun info-lookup-quick-all-modes (topic mode) |
250 | (cons mode (info-lookup->other-modes topic mode))) | |
251 | ||
5a79736d RS |
252 | ;;;###autoload |
253 | (defun info-lookup-reset () | |
254 | "Throw away all cached data. | |
255 | This command is useful if the user wants to start at the beginning without | |
256 | quitting Emacs, for example, after some Info documents were updated on the | |
257 | system." | |
258 | (interactive) | |
259 | (setq info-lookup-cache nil)) | |
260 | ||
261 | ;;;###autoload | |
262 | (defun info-lookup-symbol (symbol &optional mode) | |
3481a5c0 KH |
263 | "Display the definition of SYMBOL, as found in the relevant manual. |
264 | When this command is called interactively, it reads SYMBOL from the minibuffer. | |
265 | In the minibuffer, use M-n to yank the default argument value | |
266 | into the minibuffer so you can edit it. | |
b108eac2 KH |
267 | The default symbol is the one found at point. |
268 | ||
269 | With prefix arg a query for the symbol help mode is offered." | |
5a79736d | 270 | (interactive |
b108eac2 | 271 | (info-lookup-interactive-arguments 'symbol current-prefix-arg)) |
5a79736d RS |
272 | (info-lookup 'symbol symbol mode)) |
273 | ||
274 | ;;;###autoload | |
275 | (defun info-lookup-file (file &optional mode) | |
276 | "Display the documentation of a file. | |
3481a5c0 KH |
277 | When this command is called interactively, it reads FILE from the minibuffer. |
278 | In the minibuffer, use M-n to yank the default file name | |
279 | into the minibuffer so you can edit it. | |
b108eac2 KH |
280 | The default file name is the one found at point. |
281 | ||
282 | With prefix arg a query for the file help mode is offered." | |
5a79736d | 283 | (interactive |
b108eac2 | 284 | (info-lookup-interactive-arguments 'file current-prefix-arg)) |
5a79736d RS |
285 | (info-lookup 'file file mode)) |
286 | ||
b108eac2 KH |
287 | (defun info-lookup-interactive-arguments (topic &optional query) |
288 | "Read and return argument value (and help mode) for help topic TOPIC. | |
289 | If optional argument QUERY is non-nil, query for the help mode." | |
290 | (let* ((mode (cond (query | |
291 | (info-lookup-change-mode topic)) | |
292 | ((info-lookup->mode-value topic (info-lookup-select-mode)) | |
293 | info-lookup-mode) | |
294 | ((info-lookup-change-mode topic)))) | |
5a79736d RS |
295 | (completions (info-lookup->completions topic mode)) |
296 | (default (info-lookup-guess-default topic mode)) | |
5a79736d RS |
297 | (completion-ignore-case (info-lookup->ignore-case topic mode)) |
298 | (enable-recursive-minibuffers t) | |
299 | (value (completing-read | |
3481a5c0 | 300 | (if default |
5a79736d RS |
301 | (format "Describe %s (default %s): " topic default) |
302 | (format "Describe %s: " topic)) | |
3481a5c0 | 303 | completions nil nil nil 'info-lookup-history default))) |
5a79736d RS |
304 | (list (if (equal value "") default value) mode))) |
305 | ||
9d37318d KH |
306 | (defun info-lookup-select-mode () |
307 | (when (and (not info-lookup-mode) (buffer-file-name)) | |
308 | (let ((file-name (file-name-nondirectory (buffer-file-name))) | |
309 | (file-name-alist info-lookup-file-name-alist)) | |
310 | (while (and (not info-lookup-mode) file-name-alist) | |
311 | (when (string-match (caar file-name-alist) file-name) | |
312 | (setq info-lookup-mode (cdar file-name-alist))) | |
313 | (setq file-name-alist (cdr file-name-alist))))) | |
314 | (or info-lookup-mode (setq info-lookup-mode major-mode))) | |
315 | ||
5a79736d RS |
316 | (defun info-lookup-change-mode (topic) |
317 | (let* ((completions (mapcar (lambda (arg) | |
318 | (cons (symbol-name (car arg)) (car arg))) | |
319 | (info-lookup->topic-value topic))) | |
320 | (mode (completing-read | |
321 | (format "Use %s help mode: " topic) | |
322 | completions nil t nil 'info-lookup-history))) | |
323 | (or (setq mode (cdr (assoc mode completions))) | |
324 | (error "No %s help available" topic)) | |
325 | (or (info-lookup->mode-value topic mode) | |
326 | (error "No %s help available for `%s'" topic mode)) | |
327 | (setq info-lookup-mode mode))) | |
328 | ||
329 | (defun info-lookup (topic item mode) | |
330 | "Display the documentation of a help item." | |
9d37318d | 331 | (or mode (setq mode (info-lookup-select-mode))) |
5a79736d RS |
332 | (or (info-lookup->mode-value topic mode) |
333 | (error "No %s help available for `%s'" topic mode)) | |
334 | (let ((entry (or (assoc (if (info-lookup->ignore-case topic mode) | |
335 | (downcase item) item) | |
336 | (info-lookup->completions topic mode)) | |
337 | (error "Not documented as a %s: %s" topic (or item "")))) | |
338 | (modes (info-lookup->all-modes topic mode)) | |
339 | (window (selected-window)) | |
1d010333 | 340 | found doc-spec node prefix suffix doc-found) |
b108eac2 KH |
341 | (if (or (not info-lookup-other-window-flag) |
342 | (eq (current-buffer) (get-buffer "*info*"))) | |
5a79736d RS |
343 | (info) |
344 | (save-window-excursion (info)) | |
345 | (switch-to-buffer-other-window "*info*")) | |
346 | (while (and (not found) modes) | |
347 | (setq doc-spec (info-lookup->doc-spec topic (car modes))) | |
348 | (while (and (not found) doc-spec) | |
349 | (setq node (nth 0 (car doc-spec)) | |
350 | prefix (nth 2 (car doc-spec)) | |
351 | suffix (nth 3 (car doc-spec))) | |
1d010333 RS |
352 | (when (condition-case error-data |
353 | (progn | |
354 | (Info-goto-node node) | |
355 | (setq doc-found t)) | |
356 | (error | |
357 | (message "Cannot access Info node %s" node) | |
358 | (sit-for 1) | |
359 | nil)) | |
360 | (condition-case nil | |
361 | (progn | |
362 | (Info-menu (or (cdr entry) item)) | |
363 | (setq found t) | |
364 | (if (or prefix suffix) | |
365 | (let ((case-fold-search | |
366 | (info-lookup->ignore-case topic (car modes))) | |
367 | (buffer-read-only nil)) | |
368 | (goto-char (point-min)) | |
369 | (re-search-forward | |
370 | (concat prefix (regexp-quote item) suffix)) | |
371 | (goto-char (match-beginning 0)) | |
372 | (and window-system info-lookup-highlight-face | |
373 | ;; Search again for ITEM so that the first | |
374 | ;; occurence of ITEM will be highlighted. | |
375 | (re-search-forward (regexp-quote item)) | |
376 | (let ((start (match-beginning 0)) | |
377 | (end (match-end 0))) | |
378 | (if (overlayp info-lookup-highlight-overlay) | |
379 | (move-overlay info-lookup-highlight-overlay | |
380 | start end (current-buffer)) | |
381 | (setq info-lookup-highlight-overlay | |
382 | (make-overlay start end)))) | |
383 | (overlay-put info-lookup-highlight-overlay | |
384 | 'face info-lookup-highlight-face))))) | |
385 | (error nil))) | |
5a79736d RS |
386 | (setq doc-spec (cdr doc-spec))) |
387 | (setq modes (cdr modes))) | |
1d010333 RS |
388 | (or doc-found |
389 | (error "Info documentation for lookup was not found")) | |
5a79736d RS |
390 | ;; Don't leave the Info buffer if the help item couldn't be looked up. |
391 | (if (and info-lookup-other-window-flag found) | |
392 | (select-window window)))) | |
393 | ||
394 | (defun info-lookup-setup-mode (topic mode) | |
395 | "Initialize the internal data structure." | |
396 | (or (info-lookup->initialized topic mode) | |
397 | (let (cell data (initialized 0) completions refer-modes) | |
398 | (if (not (info-lookup->mode-value topic mode)) | |
399 | (message "No %s help available for `%s'" topic mode) | |
400 | ;; Recursively setup cross references. | |
401 | ;; But refer only to non-void modes. | |
402 | (mapcar (lambda (arg) | |
403 | (or (info-lookup->initialized topic arg) | |
404 | (info-lookup-setup-mode topic arg)) | |
405 | (and (eq (info-lookup->initialized topic arg) t) | |
406 | (setq refer-modes (cons arg refer-modes)))) | |
407 | (info-lookup->other-modes topic mode)) | |
408 | (setq refer-modes (nreverse refer-modes)) | |
409 | ;; Build the full completion alist. | |
410 | (setq completions | |
e12fcc41 KH |
411 | (nconc (condition-case nil |
412 | (info-lookup-make-completions topic mode) | |
413 | (error nil)) | |
5a79736d RS |
414 | (apply 'append |
415 | (mapcar (lambda (arg) | |
416 | (info-lookup->completions topic arg)) | |
417 | refer-modes)))) | |
418 | (setq initialized t)) | |
419 | ;; Update `info-lookup-cache'. | |
420 | (setq cell (info-lookup->mode-cache topic mode) | |
421 | data (list initialized completions refer-modes)) | |
422 | (if (not cell) | |
423 | (setcdr (info-lookup->cache topic) | |
424 | (cons (cons mode data) (info-lookup->topic-cache topic))) | |
425 | (setcdr cell data)) | |
426 | initialized))) | |
427 | ||
428 | (defun info-lookup-make-completions (topic mode) | |
429 | "Create a unique alist from all index entries." | |
1eff0ba1 RS |
430 | (let ((doc-spec (info-lookup->doc-spec topic mode)) |
431 | (regexp (concat "^\\(" (info-lookup->regexp topic mode) | |
432 | "\\)\\([ \t].*\\)?$")) | |
1d010333 | 433 | node trans entry item prefix result doc-found |
1eff0ba1 RS |
434 | (buffer (get-buffer-create " temp-info-look"))) |
435 | (with-current-buffer buffer | |
436 | (Info-mode)) | |
437 | (while doc-spec | |
438 | (setq node (nth 0 (car doc-spec)) | |
439 | trans (cond ((eq (nth 1 (car doc-spec)) nil) | |
440 | (lambda (arg) | |
441 | (if (string-match regexp arg) | |
442 | (match-string 1 arg)))) | |
443 | ((stringp (nth 1 (car doc-spec))) | |
444 | (setq prefix (nth 1 (car doc-spec))) | |
445 | (lambda (arg) | |
446 | (if (string-match "^\\([^: \t\n]+\\)" arg) | |
447 | (concat prefix (match-string 1 arg))))) | |
448 | (t (nth 1 (car doc-spec))))) | |
1d010333 RS |
449 | (with-current-buffer buffer |
450 | (message "Processing Info node `%s'..." node) | |
451 | (when (condition-case error-data | |
452 | (progn | |
453 | (Info-goto-node node) | |
454 | (setq doc-found t)) | |
455 | (error | |
456 | (message "Cannot access Info node `%s'" node) | |
457 | (sit-for 1) | |
458 | nil)) | |
459 | (condition-case nil | |
460 | (progn | |
461 | (goto-char (point-min)) | |
462 | (and (search-forward "\n* Menu:" nil t) | |
463 | (while (re-search-forward "\n\\* \\([^:\t\n]*\\):" nil t) | |
464 | (setq entry (match-string 1) | |
465 | item (funcall trans entry)) | |
6480a693 DL |
466 | ;; `trans' can return nil if the regexp doesn't match. |
467 | (when (and item | |
468 | ;; Sometimes there's more than one Menu: | |
469 | (not (string= entry "Menu"))) | |
470 | (and (info-lookup->ignore-case topic mode) | |
471 | (setq item (downcase item))) | |
472 | (and (string-equal entry item) | |
473 | (setq entry nil)) | |
474 | (and (or (assoc item result) | |
475 | (setq result (cons (cons item entry) | |
476 | result)))))))) | |
1d010333 | 477 | (error nil)))) |
1eff0ba1 RS |
478 | (message "Processing Info node `%s'...done" node) |
479 | (setq doc-spec (cdr doc-spec))) | |
1d010333 RS |
480 | (or doc-found |
481 | (error "Info documentation for lookup was not found")) | |
1eff0ba1 | 482 | result)) |
5a79736d RS |
483 | |
484 | (defun info-lookup-guess-default (topic mode) | |
ce288cb6 KH |
485 | "Return a guess for a symbol to look up, based on text around point. |
486 | Try all related modes applicable to TOPIC and MODE. | |
487 | Return nil if there is nothing appropriate in the buffer near point." | |
5a79736d | 488 | (let ((modes (info-lookup->all-modes topic mode)) |
ce288cb6 | 489 | guess) |
5a79736d RS |
490 | (while (and (not guess) modes) |
491 | (setq guess (info-lookup-guess-default* topic (car modes)) | |
ce288cb6 | 492 | modes (cdr modes))) |
5a79736d | 493 | ;; Collapse whitespace characters. |
ce288cb6 KH |
494 | (when guess |
495 | (let ((pos 0)) | |
496 | (while (string-match "[ \t\n]+" guess pos) | |
497 | (setq pos (1+ (match-beginning 0))) | |
498 | (setq guess (replace-match " " t t guess))))) | |
499 | guess)) | |
5a79736d RS |
500 | |
501 | (defun info-lookup-guess-default* (topic mode) | |
502 | (let ((case-fold-search (info-lookup->ignore-case topic mode)) | |
503 | (rule (or (info-lookup->parse-rule topic mode) | |
504 | (info-lookup->regexp topic mode))) | |
505 | (start (point)) end regexp subexp result) | |
ce288cb6 KH |
506 | (save-excursion |
507 | (if (symbolp rule) | |
508 | (setq result (funcall rule)) | |
509 | (if (consp rule) | |
510 | (setq regexp (car rule) | |
511 | subexp (cdr rule)) | |
512 | (setq regexp rule | |
513 | subexp 0)) | |
514 | (skip-chars-backward " \t\n") (setq end (point)) | |
515 | (while (and (re-search-backward regexp nil t) | |
516 | (looking-at regexp) | |
517 | (>= (match-end 0) end)) | |
518 | (setq result (match-string subexp))) | |
519 | (if (not result) | |
520 | (progn | |
521 | (goto-char start) | |
522 | (skip-chars-forward " \t\n") | |
523 | (and (looking-at regexp) | |
524 | (setq result (match-string subexp))))))) | |
5a79736d RS |
525 | result)) |
526 | ||
527 | (defun info-lookup-guess-c-symbol () | |
528 | "Get the C symbol at point." | |
529 | (condition-case nil | |
530 | (progn | |
ce288cb6 | 531 | (skip-syntax-backward "w_") |
5a79736d RS |
532 | (let ((start (point)) prefix name) |
533 | ;; Test for a leading `struct', `union', or `enum' keyword | |
534 | ;; but ignore names like `foo_struct'. | |
535 | (setq prefix (and (< (skip-chars-backward " \t\n") 0) | |
536 | (< (skip-chars-backward "_a-zA-Z0-9") 0) | |
537 | (looking-at "\\(struct\\|union\\|enum\\)\\s ") | |
538 | (concat (match-string 1) " "))) | |
539 | (goto-char start) | |
540 | (and (looking-at "[_a-zA-Z][_a-zA-Z0-9]*") | |
541 | (setq name (match-string 0))) | |
542 | ;; Caveat! Look forward if point is at `struct' etc. | |
543 | (and (not prefix) | |
544 | (or (string-equal name "struct") | |
545 | (string-equal name "union") | |
546 | (string-equal name "enum")) | |
547 | (looking-at "[a-z]+\\s +\\([_a-zA-Z][_a-zA-Z0-9]*\\)") | |
548 | (setq prefix (concat name " ") | |
549 | name (match-string 1))) | |
550 | (and (or prefix name) | |
551 | (concat prefix name)))) | |
552 | (error nil))) | |
553 | ||
554 | ;;;###autoload | |
555 | (defun info-complete-symbol (&optional mode) | |
556 | "Perform completion on symbol preceding point." | |
82fb111c RS |
557 | (interactive) |
558 | (info-complete 'symbol | |
559 | (or mode | |
560 | (if (info-lookup->mode-value | |
9d37318d KH |
561 | 'symbol (info-lookup-select-mode)) |
562 | info-lookup-mode | |
82fb111c | 563 | (info-lookup-change-mode 'symbol))))) |
5a79736d RS |
564 | |
565 | ;;;###autoload | |
566 | (defun info-complete-file (&optional mode) | |
567 | "Perform completion on file preceding point." | |
a1fee1bc KH |
568 | (interactive) |
569 | (info-complete 'file | |
570 | (or mode | |
571 | (if (info-lookup->mode-value | |
9d37318d KH |
572 | 'file (info-lookup-select-mode)) |
573 | info-lookup-mode | |
a1fee1bc | 574 | (info-lookup-change-mode 'file))))) |
5a79736d RS |
575 | |
576 | (defun info-complete (topic mode) | |
577 | "Try to complete a help item." | |
578 | (barf-if-buffer-read-only) | |
9d37318d | 579 | (or mode (setq mode (info-lookup-select-mode))) |
5a79736d RS |
580 | (or (info-lookup->mode-value topic mode) |
581 | (error "No %s completion available for `%s'" topic mode)) | |
0c10ee28 RS |
582 | (let ((modes (info-lookup-quick-all-modes topic mode)) |
583 | (start (point)) | |
584 | try) | |
5a79736d RS |
585 | (while (and (not try) modes) |
586 | (setq mode (car modes) | |
587 | modes (cdr modes) | |
588 | try (info-lookup-guess-default* topic mode)) | |
589 | (goto-char start)) | |
590 | (and (not try) | |
d2c2b883 | 591 | (error "Found no %S to complete" topic)) |
0c10ee28 RS |
592 | (let ((completions (info-lookup->completions topic mode)) |
593 | (completion-ignore-case (info-lookup->ignore-case topic mode)) | |
594 | completion) | |
595 | (setq completion (try-completion try completions)) | |
596 | (cond ((not completion) | |
597 | (ding) | |
598 | (message "No match")) | |
599 | ((stringp completion) | |
600 | (or (assoc completion completions) | |
601 | (setq completion (completing-read | |
602 | (format "Complete %S: " topic) | |
603 | completions nil t completion | |
604 | info-lookup-history))) | |
605 | (delete-region (- start (length try)) start) | |
606 | (insert completion)) | |
607 | (t | |
608 | (message "%s is complete" | |
609 | (capitalize (prin1-to-string topic)))))))) | |
d2c2b883 RS |
610 | |
611 | \f | |
d2c2b883 RS |
612 | ;;; Initialize some common modes. |
613 | ||
614 | (info-lookup-maybe-add-help | |
615 | :mode 'c-mode :topic 'symbol | |
616 | :regexp "\\(struct \\|union \\|enum \\)?[_a-zA-Z][_a-zA-Z0-9]*" | |
617 | :doc-spec '(("(libc)Function Index" nil | |
618 | "^[ \t]+- \\(Function\\|Macro\\): .*\\<" "\\>") | |
619 | ("(libc)Variable Index" nil | |
620 | "^[ \t]+- \\(Variable\\|Macro\\): .*\\<" "\\>") | |
621 | ("(libc)Type Index" nil | |
622 | "^[ \t]+- Data Type: \\<" "\\>") | |
623 | ("(termcap)Var Index" nil | |
624 | "^[ \t]*`" "'")) | |
625 | :parse-rule 'info-lookup-guess-c-symbol) | |
626 | ||
627 | (info-lookup-maybe-add-help | |
628 | :mode 'c-mode :topic 'file | |
629 | :regexp "[_a-zA-Z0-9./+-]+" | |
630 | :doc-spec '(("(libc)File Index"))) | |
631 | ||
632 | (info-lookup-maybe-add-help | |
633 | :mode 'bison-mode | |
634 | :regexp "[:;|]\\|%\\([%{}]\\|[_a-z]+\\)\\|YY[_A-Z]+\\|yy[_a-z]+" | |
635 | :doc-spec '(("(bison)Index" nil | |
636 | "`" "'")) | |
637 | :parse-rule "[:;|]\\|%\\([%{}]\\|[_a-zA-Z][_a-zA-Z0-9]*\\)" | |
638 | :other-modes '(c-mode)) | |
639 | ||
640 | (info-lookup-maybe-add-help | |
641 | :mode 'makefile-mode | |
642 | :regexp "\\$[^({]\\|\\.[_A-Z]*\\|[_a-zA-Z][_a-zA-Z0-9-]*" | |
643 | :doc-spec '(("(make)Name Index" nil | |
644 | "^[ \t]*`" "'")) | |
645 | :parse-rule "\\$[^({]\\|\\.[_A-Z]*\\|[_a-zA-Z0-9-]+") | |
646 | ||
647 | (info-lookup-maybe-add-help | |
648 | :mode 'texinfo-mode | |
649 | :regexp "@\\([a-zA-Z]+\\|[^a-zA-Z]\\)" | |
650 | :doc-spec '(("(texinfo)Command and Variable Index" | |
651 | ;; Ignore Emacs commands and prepend a `@'. | |
652 | (lambda (item) | |
653 | (if (string-match "^\\([a-zA-Z]+\\|[^a-zA-Z]\\)\\( .*\\)?$" item) | |
654 | (concat "@" (match-string 1 item)))) | |
655 | "`" "'"))) | |
656 | ||
657 | (info-lookup-maybe-add-help | |
658 | :mode 'm4-mode | |
659 | :regexp "[_a-zA-Z][_a-zA-Z0-9]*" | |
660 | :doc-spec '(("(m4)Macro index")) | |
661 | :parse-rule "[_a-zA-Z0-9]+") | |
662 | ||
663 | (info-lookup-maybe-add-help | |
664 | :mode 'autoconf-mode | |
665 | :regexp "A[CM]_[_A-Z0-9]+" | |
666 | :doc-spec '(("(autoconf)Macro Index" "AC_" | |
667 | "^[ \t]+- \\(Macro\\|Variable\\): .*\\<" "\\>") | |
668 | ("(automake)Index" nil | |
669 | "^[ \t]*`" "'")) | |
670 | ;; Autoconf symbols are M4 macros. Thus use M4's parser. | |
671 | :parse-rule 'ignore | |
672 | :other-modes '(m4-mode)) | |
673 | ||
674 | (info-lookup-maybe-add-help | |
675 | :mode 'awk-mode | |
676 | :regexp "[_a-zA-Z]+" | |
677 | :doc-spec '(("(gawk)Index" | |
678 | (lambda (item) | |
679 | (let ((case-fold-search nil)) | |
680 | (cond | |
681 | ;; `BEGIN' and `END'. | |
682 | ((string-match "^\\([A-Z]+\\) special pattern\\b" item) | |
683 | (match-string 1 item)) | |
684 | ;; `if', `while', `do', ... | |
685 | ((string-match "^\\([a-z]+\\) statement\\b" item) | |
686 | (if (not (string-equal (match-string 1 item) "control")) | |
687 | (match-string 1 item))) | |
688 | ;; `NR', `NF', ... | |
689 | ((string-match "^[A-Z]+$" item) | |
690 | item) | |
691 | ;; Built-in functions (matches to many entries). | |
692 | ((string-match "^[a-z]+$" item) | |
693 | item)))) | |
694 | "`" "\\([ \t]*([^)]*)\\)?'"))) | |
695 | ||
696 | (info-lookup-maybe-add-help | |
697 | :mode 'perl-mode | |
698 | :regexp "[$@%][^a-zA-Z]\\|\\$\\^[A-Z]\\|[$@%]?[a-zA-Z][_a-zA-Z0-9]*" | |
699 | :doc-spec '(("(perl5)Function Index" | |
700 | (lambda (item) | |
701 | (if (string-match "^\\([a-zA-Z0-9]+\\)" item) | |
702 | (match-string 1 item))) | |
703 | "^" "\\b") | |
704 | ("(perl5)Variable Index" | |
705 | (lambda (item) | |
706 | ;; Work around bad formatted array variables. | |
707 | (let ((sym (cond ((or (string-match "^\\$\\(.\\|@@\\)$" item) | |
708 | (string-match "^\\$\\^[A-Z]$" item)) | |
709 | item) | |
710 | ((string-match | |
711 | "^\\([$%@]\\|@@\\)?[_a-zA-Z0-9]+" item) | |
712 | (match-string 0 item)) | |
713 | (t "")))) | |
714 | (if (string-match "@@" sym) | |
715 | (setq sym (concat (substring sym 0 (match-beginning 0)) | |
716 | (substring sym (1- (match-end 0)))))) | |
717 | (if (string-equal sym "") nil sym))) | |
718 | "^" "\\b")) | |
719 | :parse-rule "[$@%]?\\([_a-zA-Z0-9]+\\|[^a-zA-Z]\\)") | |
720 | ||
721 | (info-lookup-maybe-add-help | |
722 | :mode 'latex-mode | |
723 | :regexp "\\\\\\([a-zA-Z]+\\|[^a-zA-Z]\\)" | |
e12fcc41 | 724 | :doc-spec '(("(latex)Command Index" nil |
d2c2b883 RS |
725 | "`" "\\({[^}]*}\\)?'"))) |
726 | ||
727 | (info-lookup-maybe-add-help | |
728 | :mode 'emacs-lisp-mode | |
729 | :regexp "[^()' \t\n]+" | |
730 | :doc-spec '(("(emacs)Command Index") | |
a1fee1bc KH |
731 | ("(emacs)Variable Index") |
732 | ("(elisp)Index" | |
733 | (lambda (item) | |
734 | (let ((sym (intern-soft item))) | |
735 | (cond ((null sym) | |
736 | (if (string-equal item "nil") item)) | |
737 | ((or (boundp sym) (fboundp sym)) | |
738 | item)))) | |
739 | "^[ \t]+- [^:]+:[ \t]*" "\\b"))) | |
d2c2b883 RS |
740 | |
741 | (info-lookup-maybe-add-help | |
742 | :mode 'lisp-interaction-mode | |
743 | :regexp "[^()' \t\n]+" | |
744 | :parse-rule 'ignore | |
745 | :other-modes '(emacs-lisp-mode)) | |
746 | ||
0c10ee28 RS |
747 | (info-lookup-maybe-add-help |
748 | :mode 'lisp-mode | |
749 | :regexp "[^()' \t\n]+" | |
750 | :parse-rule 'ignore | |
751 | :other-modes '(emacs-lisp-mode)) | |
752 | ||
9d37318d KH |
753 | (info-lookup-maybe-add-help |
754 | :mode 'scheme-mode | |
755 | :regexp "[^()' \t\n]+" | |
756 | :ignore-case t | |
6480a693 | 757 | ;; Aubrey Jaffer's rendition from <URL:ftp://ftp-swiss.ai.mit.edu/pub/scm> |
9d37318d KH |
758 | :doc-spec '(("(r5rs)Index" nil |
759 | "^[ \t]+- [^:]+:[ \t]*" "\\b"))) | |
760 | ||
054e5c20 SE |
761 | (info-lookup-maybe-add-help |
762 | :mode 'octave-mode | |
763 | :regexp "[_a-zA-Z0-9]+" | |
764 | :doc-spec '(("(octave)Function Index" nil "^ - [^:]+:[ ]+" nil) | |
765 | ("(octave)Variable Index" nil "^ - [^:]+:[ ]+" nil) | |
766 | ;; Catch lines of the form "xyz statement" | |
767 | ("(octave)Concept Index" | |
768 | (lambda (item) | |
769 | (cond | |
770 | ((string-match "^\\([A-Z]+\\) statement\\b" item) | |
771 | (match-string 1 item)) | |
772 | (t nil))) | |
773 | nil; "^ - [^:]+:[ ]+" don't think this prefix is useful here. | |
774 | nil))) | |
d2c2b883 | 775 | \f |
5a79736d RS |
776 | (provide 'info-look) |
777 | ||
778 | ;;; info-look.el ends here |