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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 | ||
4 | ;; Copyright (C) 1995, 1996, 1997 Ralph Schleicher. | |
5 | ||
6 | ;; Author: Ralph Schleicher <rs@purple.UL.BaWue.DE> | |
7 | ;; Keywords: help languages | |
8 | ||
9 | ;; This file is part of GNU Emacs. | |
10 | ||
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. | |
15 | ||
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. | |
20 | ||
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. | |
25 | ||
26 | ;;; Code: | |
27 | ||
28 | (require 'info) | |
29 | ||
30 | (defvar info-lookup-mode nil | |
31 | "*Symbol of the current buffer's help mode. | |
32 | Provide help according to the buffer's major mode if value is nil. | |
33 | Automatically becomes buffer local when set in any fashion.") | |
34 | (make-variable-buffer-local 'info-lookup-mode) | |
35 | ||
36 | (defvar info-lookup-other-window-flag t | |
37 | "*Non-nil means pop up the Info buffer in another window.") | |
38 | ||
39 | (defvar info-lookup-highlight-face 'highlight | |
40 | "*Face for highlighting looked up help items. | |
41 | Setting this variable to nil disables highlighting.") | |
42 | ||
43 | (defvar info-lookup-highlight-overlay nil | |
44 | "Overlay object used for highlighting.") | |
45 | ||
46 | (defvar info-lookup-history nil | |
47 | "History of previous input lines.") | |
48 | ||
49 | (defvar info-lookup-alist '((symbol . info-lookup-symbol-alist) | |
50 | (file . info-lookup-file-alist)) | |
51 | "*Alist of known help topics. | |
52 | Cons cells are of the form | |
53 | ||
54 | (HELP-TOPIC . VARIABLE) | |
55 | ||
56 | HELP-TOPIC is the symbol of a help topic. | |
57 | VARIABLE is a variable storing HELP-TOPIC's public data. | |
58 | Value is an alist with elements of the form | |
59 | ||
60 | (HELP-MODE REGEXP IGNORE-CASE DOC-SPEC PARSE-RULE OTHER-MODES) | |
61 | ||
62 | HELP-MODE is a mode's symbol. | |
63 | REGEXP is a regular expression matching those help items whose | |
64 | documentation can be looked up via DOC-SPEC. | |
65 | IGNORE-CASE is non-nil if help items are case insensitive. | |
66 | DOC-SPEC is a list of documentation specifications of the form | |
67 | ||
68 | (INFO-NODE TRANS-FUNC PREFIX SUFFIX) | |
69 | ||
70 | INFO-NODE is the name (including file name part) of an Info index. | |
71 | TRANS-FUNC is a function translating index entries into help items; | |
72 | nil means add only those index entries matching REGEXP, a string | |
73 | means prepend string to the first word of all index entries. | |
74 | PREFIX and SUFFIX are parts of a regular expression. If one of | |
75 | them is non-nil then search the help item's Info node for the | |
76 | first occurrence of the regular expression `PREFIX ITEM SUFFIX'. | |
77 | ITEM will be highlighted with `info-lookup-highlight-face' if this | |
78 | variable is not nil. | |
79 | PARSE-RULE is either the symbol name of a function or a regular | |
80 | expression for guessing the default help item at point. Fuzzy | |
81 | regular expressions like \"[_a-zA-Z0-9]+\" do a better job if | |
82 | there are no clear delimiters; do not try to write too complex | |
83 | expressions. PARSE-RULE defaults to REGEXP. | |
84 | OTHER-MODES is a list of cross references to other help modes.") | |
85 | ||
86 | (defsubst info-lookup->topic-value (topic) | |
87 | (symbol-value (cdr (assoc topic info-lookup-alist)))) | |
88 | ||
89 | (defsubst info-lookup->mode-value (topic mode) | |
90 | (assoc mode (info-lookup->topic-value topic))) | |
91 | ||
92 | (defsubst info-lookup->regexp (topic mode) | |
93 | (nth 1 (info-lookup->mode-value topic mode))) | |
94 | ||
95 | (defsubst info-lookup->ignore-case (topic mode) | |
96 | (nth 2 (info-lookup->mode-value topic mode))) | |
97 | ||
98 | (defsubst info-lookup->doc-spec (topic mode) | |
99 | (nth 3 (info-lookup->mode-value topic mode))) | |
100 | ||
101 | (defsubst info-lookup->parse-rule (topic mode) | |
102 | (nth 4 (info-lookup->mode-value topic mode))) | |
103 | ||
104 | (defsubst info-lookup->other-modes (topic mode) | |
105 | (nth 5 (info-lookup->mode-value topic mode))) | |
106 | ||
107 | (defvar info-lookup-cache nil | |
108 | "Cache storing data maintained automatically by the program. | |
109 | Value is an alist with cons cell of the form | |
110 | ||
111 | (HELP-TOPIC . ((HELP-MODE INITIALIZED COMPLETIONS REFER-MODES) ...)) | |
112 | ||
113 | HELP-TOPIC is the symbol of a help topic. | |
114 | HELP-MODE is a mode's symbol. | |
115 | INITIALIZED is nil if HELP-MODE is uninitialized, t if | |
116 | HELP-MODE is initialized, and `0' means HELP-MODE is | |
117 | initialized but void. | |
118 | COMPLETIONS is an alist of documented help items. | |
119 | REFER-MODES is a list of other help modes to use.") | |
120 | ||
121 | (defsubst info-lookup->cache (topic) | |
122 | (or (assoc topic info-lookup-cache) | |
123 | (car (setq info-lookup-cache | |
124 | (cons (cons topic nil) | |
125 | info-lookup-cache))))) | |
126 | ||
127 | (defsubst info-lookup->topic-cache (topic) | |
128 | (cdr (info-lookup->cache topic))) | |
129 | ||
130 | (defsubst info-lookup->mode-cache (topic mode) | |
131 | (assoc mode (info-lookup->topic-cache topic))) | |
132 | ||
133 | (defsubst info-lookup->initialized (topic mode) | |
134 | (nth 1 (info-lookup->mode-cache topic mode))) | |
135 | ||
136 | (defsubst info-lookup->completions (topic mode) | |
137 | (or (info-lookup->initialized topic mode) | |
138 | (info-lookup-setup-mode topic mode)) | |
139 | (nth 2 (info-lookup->mode-cache topic mode))) | |
140 | ||
141 | (defsubst info-lookup->refer-modes (topic mode) | |
142 | (or (info-lookup->initialized topic mode) | |
143 | (info-lookup-setup-mode topic mode)) | |
144 | (nth 3 (info-lookup->mode-cache topic mode))) | |
145 | ||
146 | (defsubst info-lookup->all-modes (topic mode) | |
147 | (cons mode (info-lookup->refer-modes topic mode))) | |
148 | ||
149 | (defvar info-lookup-symbol-alist | |
150 | '((autoconf-mode | |
151 | "A[CM]_[_A-Z0-9]+" nil | |
152 | (("(autoconf)Macro Index" "AC_" | |
153 | "^[ \t]+- \\(Macro\\|Variable\\): .*\\<" "\\>") | |
154 | ("(automake)Index" nil | |
155 | "^[ \t]*`" "'")) | |
156 | ;; Autoconf symbols are M4 macros. Thus use M4's parser. | |
157 | ignore | |
158 | (m4-mode)) | |
159 | (bison-mode | |
160 | "[:;|]\\|%\\([%{}]\\|[_a-z]+\\)\\|YY[_A-Z]+\\|yy[_a-z]+" nil | |
161 | (("(bison)Index" nil | |
162 | "`" "'")) | |
163 | "[:;|]\\|%\\([%{}]\\|[_a-zA-Z][_a-zA-Z0-9]*\\)" | |
164 | (c-mode)) | |
165 | (c-mode | |
166 | "\\(struct \\|union \\|enum \\)?[_a-zA-Z][_a-zA-Z0-9]*" nil | |
167 | (("(libc)Function Index" nil | |
168 | "^[ \t]+- \\(Function\\|Macro\\): .*\\<" "\\>") | |
169 | ("(libc)Variable Index" nil | |
170 | "^[ \t]+- \\(Variable\\|Macro\\): .*\\<" "\\>") | |
171 | ("(libc)Type Index" nil | |
172 | "^[ \t]+- Data Type: \\<" "\\>") | |
173 | ("(termcap)Var Index" nil | |
174 | "^[ \t]*`" "'")) | |
175 | info-lookup-guess-c-symbol) | |
176 | (m4-mode | |
177 | "[_a-zA-Z][_a-zA-Z0-9]*" nil | |
178 | (("(m4)Macro index")) | |
179 | "[_a-zA-Z0-9]+") | |
180 | (makefile-mode | |
181 | "\\$[^({]\\|\\.[_A-Z]*\\|[_a-zA-Z][_a-zA-Z0-9-]*" nil | |
182 | (("(make)Name Index" nil | |
183 | "^[ \t]*`" "'")) | |
184 | "\\$[^({]\\|\\.[_A-Z]*\\|[_a-zA-Z0-9-]+") | |
185 | (texinfo-mode | |
186 | "@\\([a-zA-Z]+\\|[^a-zA-Z]\\)" nil | |
187 | (("(texinfo)Command and Variable Index" | |
188 | ;; Ignore Emacs commands and prepend a `@'. | |
189 | (lambda (item) | |
190 | (if (string-match "^\\([a-zA-Z]+\\|[^a-zA-Z]\\)\\( .*\\)?$" item) | |
191 | (concat "@" (match-string 1 item)))) | |
192 | "`" "'")))) | |
193 | "*Alist of help specifications for symbol names. | |
194 | See the documentation of the variable `info-lookup-alist' for more details.") | |
195 | ||
196 | (defvar info-lookup-file-alist | |
197 | '((c-mode | |
198 | "[_a-zA-Z0-9./+-]+" nil | |
199 | (("(libc)File Index")))) | |
200 | "*Alist of help specifications for file names. | |
201 | See the documentation of the variable `info-lookup-alist' for more details.") | |
202 | ||
203 | ;;;###autoload | |
204 | (defun info-lookup-reset () | |
205 | "Throw away all cached data. | |
206 | This command is useful if the user wants to start at the beginning without | |
207 | quitting Emacs, for example, after some Info documents were updated on the | |
208 | system." | |
209 | (interactive) | |
210 | (setq info-lookup-cache nil)) | |
211 | ||
212 | ;;;###autoload | |
213 | (defun info-lookup-symbol (symbol &optional mode) | |
214 | "Display the documentation of a symbol. | |
215 | If called interactively, SYMBOL will be read from the mini-buffer. | |
216 | Prefix argument means unconditionally insert the default symbol name | |
217 | into the mini-buffer so that it can be edited. | |
218 | The default symbol is the one found at point." | |
219 | (interactive | |
220 | (info-lookup-interactive-arguments 'symbol)) | |
221 | (info-lookup 'symbol symbol mode)) | |
222 | ||
223 | ;;;###autoload | |
224 | (defun info-lookup-file (file &optional mode) | |
225 | "Display the documentation of a file. | |
226 | If called interactively, FILE will be read from the mini-buffer. | |
227 | Prefix argument means unconditionally insert the default file name | |
228 | into the mini-buffer so that it can be edited. | |
229 | The default file name is the one found at point." | |
230 | (interactive | |
231 | (info-lookup-interactive-arguments 'file)) | |
232 | (info-lookup 'file file mode)) | |
233 | ||
234 | (defun info-lookup-interactive-arguments (topic) | |
235 | "Return default value and help mode for help topic TOPIC." | |
236 | (let* ((mode (if (info-lookup->mode-value | |
237 | topic (or info-lookup-mode major-mode)) | |
238 | (or info-lookup-mode major-mode) | |
239 | (info-lookup-change-mode topic))) | |
240 | (completions (info-lookup->completions topic mode)) | |
241 | (default (info-lookup-guess-default topic mode)) | |
242 | (input (if (or current-prefix-arg (not (assoc default completions))) | |
243 | default)) | |
244 | (completion-ignore-case (info-lookup->ignore-case topic mode)) | |
245 | (enable-recursive-minibuffers t) | |
246 | (value (completing-read | |
247 | (if (and default (not input)) | |
248 | (format "Describe %s (default %s): " topic default) | |
249 | (format "Describe %s: " topic)) | |
250 | completions nil nil input 'info-lookup-history))) | |
251 | (list (if (equal value "") default value) mode))) | |
252 | ||
253 | (defun info-lookup-change-mode (topic) | |
254 | (let* ((completions (mapcar (lambda (arg) | |
255 | (cons (symbol-name (car arg)) (car arg))) | |
256 | (info-lookup->topic-value topic))) | |
257 | (mode (completing-read | |
258 | (format "Use %s help mode: " topic) | |
259 | completions nil t nil 'info-lookup-history))) | |
260 | (or (setq mode (cdr (assoc mode completions))) | |
261 | (error "No %s help available" topic)) | |
262 | (or (info-lookup->mode-value topic mode) | |
263 | (error "No %s help available for `%s'" topic mode)) | |
264 | (setq info-lookup-mode mode))) | |
265 | ||
266 | (defun info-lookup (topic item mode) | |
267 | "Display the documentation of a help item." | |
268 | (if (not mode) | |
269 | (setq mode (or info-lookup-mode major-mode))) | |
270 | (or (info-lookup->mode-value topic mode) | |
271 | (error "No %s help available for `%s'" topic mode)) | |
272 | (let ((entry (or (assoc (if (info-lookup->ignore-case topic mode) | |
273 | (downcase item) item) | |
274 | (info-lookup->completions topic mode)) | |
275 | (error "Not documented as a %s: %s" topic (or item "")))) | |
276 | (modes (info-lookup->all-modes topic mode)) | |
277 | (window (selected-window)) | |
278 | found doc-spec node prefix suffix) | |
279 | (if (not info-lookup-other-window-flag) | |
280 | (info) | |
281 | (save-window-excursion (info)) | |
282 | (switch-to-buffer-other-window "*info*")) | |
283 | (while (and (not found) modes) | |
284 | (setq doc-spec (info-lookup->doc-spec topic (car modes))) | |
285 | (while (and (not found) doc-spec) | |
286 | (setq node (nth 0 (car doc-spec)) | |
287 | prefix (nth 2 (car doc-spec)) | |
288 | suffix (nth 3 (car doc-spec))) | |
289 | (condition-case nil | |
290 | (progn | |
291 | (Info-goto-node node) | |
292 | (Info-menu (or (cdr entry) item)) | |
293 | (setq found t) | |
294 | (if (or prefix suffix) | |
295 | (let ((case-fold-search | |
296 | (info-lookup->ignore-case topic (car modes))) | |
297 | (buffer-read-only nil)) | |
298 | (goto-char (point-min)) | |
299 | (re-search-forward | |
300 | (concat prefix (regexp-quote item) suffix)) | |
301 | (goto-char (match-beginning 0)) | |
302 | (and window-system info-lookup-highlight-face | |
303 | ;; Search again for ITEM so that the first | |
304 | ;; occurence of ITEM will be highlighted. | |
305 | (re-search-forward (regexp-quote item)) | |
306 | (let ((start (match-beginning 0)) | |
307 | (end (match-end 0))) | |
308 | (if (overlayp info-lookup-highlight-overlay) | |
309 | (move-overlay info-lookup-highlight-overlay | |
310 | start end (current-buffer)) | |
311 | (setq info-lookup-highlight-overlay | |
312 | (make-overlay start end)))) | |
313 | (overlay-put info-lookup-highlight-overlay | |
314 | 'face info-lookup-highlight-face))))) | |
315 | (error nil)) | |
316 | (setq doc-spec (cdr doc-spec))) | |
317 | (setq modes (cdr modes))) | |
318 | ;; Don't leave the Info buffer if the help item couldn't be looked up. | |
319 | (if (and info-lookup-other-window-flag found) | |
320 | (select-window window)))) | |
321 | ||
322 | (defun info-lookup-setup-mode (topic mode) | |
323 | "Initialize the internal data structure." | |
324 | (or (info-lookup->initialized topic mode) | |
325 | (let (cell data (initialized 0) completions refer-modes) | |
326 | (if (not (info-lookup->mode-value topic mode)) | |
327 | (message "No %s help available for `%s'" topic mode) | |
328 | ;; Recursively setup cross references. | |
329 | ;; But refer only to non-void modes. | |
330 | (mapcar (lambda (arg) | |
331 | (or (info-lookup->initialized topic arg) | |
332 | (info-lookup-setup-mode topic arg)) | |
333 | (and (eq (info-lookup->initialized topic arg) t) | |
334 | (setq refer-modes (cons arg refer-modes)))) | |
335 | (info-lookup->other-modes topic mode)) | |
336 | (setq refer-modes (nreverse refer-modes)) | |
337 | ;; Build the full completion alist. | |
338 | (setq completions | |
339 | (nconc (info-lookup-make-completions topic mode) | |
340 | (apply 'append | |
341 | (mapcar (lambda (arg) | |
342 | (info-lookup->completions topic arg)) | |
343 | refer-modes)))) | |
344 | (setq initialized t)) | |
345 | ;; Update `info-lookup-cache'. | |
346 | (setq cell (info-lookup->mode-cache topic mode) | |
347 | data (list initialized completions refer-modes)) | |
348 | (if (not cell) | |
349 | (setcdr (info-lookup->cache topic) | |
350 | (cons (cons mode data) (info-lookup->topic-cache topic))) | |
351 | (setcdr cell data)) | |
352 | initialized))) | |
353 | ||
354 | (defun info-lookup-make-completions (topic mode) | |
355 | "Create a unique alist from all index entries." | |
356 | (condition-case nil | |
357 | (let ((doc-spec (info-lookup->doc-spec topic mode)) | |
358 | (regexp (concat "^\\(" (info-lookup->regexp topic mode) | |
359 | "\\)\\([ \t].*\\)?$")) | |
360 | node trans entry item prefix result) | |
361 | (save-window-excursion | |
362 | (info) | |
363 | (while doc-spec | |
364 | (setq node (nth 0 (car doc-spec)) | |
365 | trans (cond ((eq (nth 1 (car doc-spec)) nil) | |
366 | (lambda (arg) | |
367 | (if (string-match regexp arg) | |
368 | (match-string 1 arg)))) | |
369 | ((stringp (nth 1 (car doc-spec))) | |
370 | (setq prefix (nth 1 (car doc-spec))) | |
371 | (lambda (arg) | |
372 | (if (string-match "^\\([^: \t\n]+\\)" arg) | |
373 | (concat prefix (match-string 1 arg))))) | |
374 | (t (nth 1 (car doc-spec))))) | |
375 | (message "Processing Info node \"%s\"..." node) | |
376 | (Info-goto-node node) | |
377 | (goto-char (point-min)) | |
378 | (and (search-forward "\n* Menu:" nil t) | |
379 | (while (re-search-forward "\n\\* \\([^:\t\n]*\\):" nil t) | |
380 | (setq entry (match-string 1) | |
381 | item (funcall trans entry)) | |
382 | (and (info-lookup->ignore-case topic mode) | |
383 | (setq item (downcase item))) | |
384 | (and (string-equal entry item) | |
385 | (setq entry nil)) | |
386 | (or (assoc item result) | |
387 | (setq result (cons (cons item entry) result))))) | |
388 | (message "Processing Info node \"%s\"... done" node) | |
389 | (setq doc-spec (cdr doc-spec))) | |
390 | (Info-directory)) | |
391 | result) | |
392 | (error nil))) | |
393 | ||
394 | (defun info-lookup-guess-default (topic mode) | |
395 | "Pick up default item at point (with favor to look back). | |
396 | Return nil if there is nothing appropriate." | |
397 | (let ((modes (info-lookup->all-modes topic mode)) | |
398 | (start (point)) guess whitespace) | |
399 | (while (and (not guess) modes) | |
400 | (setq guess (info-lookup-guess-default* topic (car modes)) | |
401 | modes (cdr modes)) | |
402 | (goto-char start)) | |
403 | ;; Collapse whitespace characters. | |
404 | (and guess (concat (delete nil (mapcar (lambda (ch) | |
405 | (if (or (char-equal ch ? ) | |
406 | (char-equal ch ?\t) | |
407 | (char-equal ch ?\n)) | |
408 | (if (not whitespace) | |
409 | (setq whitespace ? )) | |
410 | (setq whitespace nil) ch)) | |
411 | guess)))))) | |
412 | ||
413 | (defun info-lookup-guess-default* (topic mode) | |
414 | (let ((case-fold-search (info-lookup->ignore-case topic mode)) | |
415 | (rule (or (info-lookup->parse-rule topic mode) | |
416 | (info-lookup->regexp topic mode))) | |
417 | (start (point)) end regexp subexp result) | |
418 | (if (symbolp rule) | |
419 | (setq result (funcall rule)) | |
420 | (if (consp rule) | |
421 | (setq regexp (car rule) | |
422 | subexp (cdr rule)) | |
423 | (setq regexp rule | |
424 | subexp 0)) | |
425 | (skip-chars-backward " \t\n") (setq end (point)) | |
426 | (while (and (re-search-backward regexp nil t) | |
427 | (looking-at regexp) | |
428 | (>= (match-end 0) end)) | |
429 | (setq result (match-string subexp))) | |
430 | (if (not result) | |
431 | (progn | |
432 | (goto-char start) | |
433 | (skip-chars-forward " \t\n") | |
434 | (and (looking-at regexp) | |
435 | (setq result (match-string subexp)))))) | |
436 | result)) | |
437 | ||
438 | (defun info-lookup-guess-c-symbol () | |
439 | "Get the C symbol at point." | |
440 | (condition-case nil | |
441 | (progn | |
442 | (backward-sexp) | |
443 | (let ((start (point)) prefix name) | |
444 | ;; Test for a leading `struct', `union', or `enum' keyword | |
445 | ;; but ignore names like `foo_struct'. | |
446 | (setq prefix (and (< (skip-chars-backward " \t\n") 0) | |
447 | (< (skip-chars-backward "_a-zA-Z0-9") 0) | |
448 | (looking-at "\\(struct\\|union\\|enum\\)\\s ") | |
449 | (concat (match-string 1) " "))) | |
450 | (goto-char start) | |
451 | (and (looking-at "[_a-zA-Z][_a-zA-Z0-9]*") | |
452 | (setq name (match-string 0))) | |
453 | ;; Caveat! Look forward if point is at `struct' etc. | |
454 | (and (not prefix) | |
455 | (or (string-equal name "struct") | |
456 | (string-equal name "union") | |
457 | (string-equal name "enum")) | |
458 | (looking-at "[a-z]+\\s +\\([_a-zA-Z][_a-zA-Z0-9]*\\)") | |
459 | (setq prefix (concat name " ") | |
460 | name (match-string 1))) | |
461 | (and (or prefix name) | |
462 | (concat prefix name)))) | |
463 | (error nil))) | |
464 | ||
465 | ;;;###autoload | |
466 | (defun info-complete-symbol (&optional mode) | |
467 | "Perform completion on symbol preceding point." | |
82fb111c RS |
468 | (interactive) |
469 | (info-complete 'symbol | |
470 | (or mode | |
471 | (if (info-lookup->mode-value | |
472 | 'symbol (or info-lookup-mode major-mode)) | |
473 | (or info-lookup-mode major-mode) | |
474 | (info-lookup-change-mode 'symbol))))) | |
5a79736d RS |
475 | |
476 | ;;;###autoload | |
477 | (defun info-complete-file (&optional mode) | |
478 | "Perform completion on file preceding point." | |
479 | (interactive | |
480 | (list (if (info-lookup->mode-value | |
481 | 'file (or info-lookup-mode major-mode)) | |
482 | (or info-lookup-mode major-mode) | |
483 | (info-lookup-change-mode 'file)))) | |
484 | (info-complete 'file mode)) | |
485 | ||
486 | (defun info-complete (topic mode) | |
487 | "Try to complete a help item." | |
488 | (barf-if-buffer-read-only) | |
489 | (if (not mode) | |
490 | (setq mode (or info-lookup-mode major-mode))) | |
491 | (or (info-lookup->mode-value topic mode) | |
492 | (error "No %s completion available for `%s'" topic mode)) | |
493 | (let ((modes (info-lookup->all-modes topic mode)) | |
494 | (start (point)) try completion) | |
495 | (while (and (not try) modes) | |
496 | (setq mode (car modes) | |
497 | modes (cdr modes) | |
498 | try (info-lookup-guess-default* topic mode)) | |
499 | (goto-char start)) | |
500 | (and (not try) | |
501 | (error "Found no %s to complete" topic)) | |
502 | (setq completion (try-completion | |
503 | try (info-lookup->completions topic mode))) | |
504 | (cond ((not completion) | |
505 | (ding)) | |
506 | ((stringp completion) | |
507 | (delete-region (- start (length try)) start) | |
508 | (insert completion))))) | |
509 | ||
510 | (provide 'info-look) | |
511 | ||
512 | ;;; info-look.el ends here |