|
0
|
1 ;;!emacs
|
|
|
2 ;;
|
|
|
3 ;; FILE: hbdata.el
|
|
|
4 ;; SUMMARY: Hyperbole button attribute accessor methods.
|
|
|
5 ;; USAGE: GNU Emacs Lisp Library
|
|
|
6 ;; KEYWORDS: hypermedia
|
|
|
7 ;;
|
|
|
8 ;; AUTHOR: Bob Weiner
|
|
|
9 ;; ORG: Brown U.
|
|
|
10 ;;
|
|
|
11 ;; ORIG-DATE: 2-Apr-91
|
|
|
12 ;; LAST-MOD: 14-Apr-95 at 15:59:49 by Bob Weiner
|
|
|
13 ;;
|
|
|
14 ;; This file is part of Hyperbole.
|
|
|
15 ;; Available for use and distribution under the same terms as GNU Emacs.
|
|
|
16 ;;
|
|
|
17 ;; Copyright (C) 1991-1995, Free Software Foundation, Inc.
|
|
|
18 ;; Developed with support from Motorola Inc.
|
|
|
19 ;;
|
|
|
20 ;; DESCRIPTION:
|
|
|
21 ;;
|
|
|
22 ;; This module handles Hyperbole button data/attribute storage. In
|
|
|
23 ;; general, it should not be extended by anyone other than Hyperbole
|
|
|
24 ;; maintainers. If you alter the formats or accessors herein, you are
|
|
|
25 ;; likely to make your buttons incompatible with future releases.
|
|
|
26 ;; System developers should instead work with and extend the "hbut.el"
|
|
|
27 ;; module which provides much of the Hyperbole application programming
|
|
|
28 ;; interface and which hides the low level details handled by this
|
|
|
29 ;; module.
|
|
|
30 ;;
|
|
|
31 ;;
|
|
|
32 ;; Button data is typically stored within a file that holds the button
|
|
|
33 ;; data for all files within that directory. The name of this file is
|
|
|
34 ;; given by the variable 'hattr:filename,' usually it is ".hypb".
|
|
|
35 ;;
|
|
|
36 ;; Here is a sample from a Hyperbole V2 button data file. Each button
|
|
|
37 ;; data entry is a list of fields:
|
|
|
38 ;;
|
|
|
39 ;;
|
|
|
40 ;; "TO-DO"
|
|
|
41 ;; (Key Placeholders LinkType <arg-list> creator and modifier with times)
|
|
|
42 ;; ("alt.mouse.el" nil nil link-to-file ("./ell/alt-mouse.el") "zzz@cs.brown.edu" "19911027:09:19:26" "zzz" "19911027:09:31:36")
|
|
|
43 ;;
|
|
|
44 ;; which means: button \<(alt.mouse.el)> found in file "TO-DO" in the current
|
|
|
45 ;; directory provides a link to the local file "./ell/alt-mouse.el". It was
|
|
|
46 ;; created and last modified by zzz@cs.brown.edu.
|
|
|
47 ;;
|
|
|
48 ;; All link entries that originate from the same source file are stored
|
|
|
49 ;; contiguously, one per line, in reverse order of creation.
|
|
|
50 ;; Preceding all such entries is the source name (in the case of a file
|
|
|
51 ;; used as a source, no directory information is included, since only
|
|
|
52 ;; sources within the same directory as the button data file are used as
|
|
|
53 ;; source files within it.
|
|
|
54 ;;
|
|
|
55 ;; DESCRIP-END.
|
|
|
56
|
|
|
57 ;;; ************************************************************************
|
|
|
58 ;;; Other required Elisp libraries
|
|
|
59 ;;; ************************************************************************
|
|
|
60
|
|
|
61 (require 'hbmap)
|
|
|
62
|
|
|
63 ;;; ************************************************************************
|
|
|
64 ;;; Public functions
|
|
|
65 ;;; ************************************************************************
|
|
|
66
|
|
|
67 ;;; ------------------------------------------------------------------------
|
|
|
68 ;;; Button data accessor functions
|
|
|
69 ;;; ------------------------------------------------------------------------
|
|
|
70 (defun hbdata:action (hbdata)
|
|
|
71 "[Hyp V2] Returns action overriding button's action type or nil."
|
|
|
72 (nth 1 hbdata))
|
|
|
73
|
|
|
74 (defun hbdata:actype (hbdata)
|
|
|
75 "Returns the action type in HBDATA as a string."
|
|
|
76 (let ((nm (symbol-name (nth 3 hbdata))))
|
|
|
77 (and nm (if (or (= (length nm) 2) (string-match "::" nm))
|
|
|
78 nm (concat "actypes::" nm)))))
|
|
|
79
|
|
|
80 (defun hbdata:args (hbdata)
|
|
|
81 "Returns the list of any arguments given in HBDATA."
|
|
|
82 (nth 4 hbdata))
|
|
|
83
|
|
|
84 (defun hbdata:categ (hbdata)
|
|
|
85 "Returns the category of HBDATA's button."
|
|
|
86 'explicit)
|
|
|
87
|
|
|
88 (defun hbdata:creator (hbdata)
|
|
|
89 "Returns the user-id of the original creator of HBDATA's button."
|
|
|
90 (nth 5 hbdata))
|
|
|
91
|
|
|
92 (defun hbdata:create-time (hbdata)
|
|
|
93 "Returns the original creation time given for HBDATA's button."
|
|
|
94 (nth 6 hbdata))
|
|
|
95
|
|
|
96 (defun hbdata:key (hbdata)
|
|
|
97 "Returns the indexing key in HBDATA as a string."
|
|
|
98 (car hbdata))
|
|
|
99
|
|
|
100 (defun hbdata:loc-p (hbdata)
|
|
|
101 "[Hyp V1] Returns 'L iff HBDATA referent is within a local file system.
|
|
|
102 Returns 'R if remote and nil if irrelevant for button action type."
|
|
|
103 (nth 1 hbdata))
|
|
|
104
|
|
|
105 (defun hbdata:modifier (hbdata)
|
|
|
106 "Returns the user-id of the most recent modifier of HBDATA's button.
|
|
|
107 Nil is returned when button has not been modified."
|
|
|
108 (nth 7 hbdata))
|
|
|
109
|
|
|
110 (defun hbdata:mod-time (hbdata)
|
|
|
111 "Returns the time of the most recent change to HBDATA's button.
|
|
|
112 Nil is returned when button has not beened modified."
|
|
|
113 (nth 8 hbdata))
|
|
|
114
|
|
|
115 (defun hbdata:referent (hbdata)
|
|
|
116 "Returns the referent name in HBDATA."
|
|
|
117 (nth 2 hbdata))
|
|
|
118
|
|
|
119 (defun hbdata:search (buf label partial)
|
|
|
120 "Go to Hyperbole hbdata BUF and find LABEL whole or PARTIAL matches.
|
|
|
121 Search is case-insensitive. Returns list with elements:
|
|
|
122 (<button-src> <label-key1> ... <label-keyN>)."
|
|
|
123 (set-buffer buf)
|
|
|
124 (let ((case-fold-search t) (src-matches) (src) (matches) (end))
|
|
|
125 (goto-char (point-min))
|
|
|
126 (while (re-search-forward "^\^L\n\"\\([^\"]+\\)\"" nil t)
|
|
|
127 (setq src (buffer-substring (match-beginning 1)
|
|
|
128 (match-end 1))
|
|
|
129 matches nil)
|
|
|
130 (save-excursion
|
|
|
131 (setq end (if (re-search-forward "^\^L" nil t)
|
|
|
132 (1- (point)) (point-max))))
|
|
|
133 (while (re-search-forward
|
|
|
134 (concat "^(\"\\(" (if partial "[^\"]*")
|
|
|
135 (regexp-quote (ebut:label-to-key label))
|
|
|
136 (if partial "[^\"]*") "\\)\"") nil t)
|
|
|
137 (setq matches (cons
|
|
|
138 (buffer-substring (match-beginning 1)
|
|
|
139 (match-end 1))
|
|
|
140 matches)))
|
|
|
141 (if matches
|
|
|
142 (setq src-matches (cons (cons src matches) src-matches)))
|
|
|
143 (goto-char end))
|
|
|
144 src-matches))
|
|
|
145
|
|
|
146 ;;; ------------------------------------------------------------------------
|
|
|
147 ;;; Button data operators
|
|
|
148 ;;; ------------------------------------------------------------------------
|
|
|
149
|
|
|
150 (defun hbdata:build (&optional mod-lbl-key but-sym)
|
|
|
151 "Tries to construct button data from optional MOD-LBL-KEY and BUT-SYM.
|
|
|
152 MOD-LBL-KEY nil means create a new entry, otherwise modify existing one.
|
|
|
153 BUT-SYM nil means use 'hbut:current'. If successful, returns a cons of
|
|
|
154 (button-data . button-instance-str), else nil."
|
|
|
155 (let* ((but)
|
|
|
156 (b (hattr:copy (or but-sym 'hbut:current) 'but))
|
|
|
157 (l (hattr:get b 'loc))
|
|
|
158 (key (or mod-lbl-key (hattr:get b 'lbl-key)))
|
|
|
159 (new-key (if mod-lbl-key (hattr:get b 'lbl-key) key))
|
|
|
160 (lbl-instance) (creator) (create-time) (modifier) (mod-time)
|
|
|
161 (entry) loc dir)
|
|
|
162 (if (null l)
|
|
|
163 nil
|
|
|
164 (setq loc (if (bufferp l) l (file-name-nondirectory l))
|
|
|
165 dir (if (bufferp l) nil (file-name-directory l)))
|
|
|
166 (if (setq entry (hbdata:to-entry key loc dir (not mod-lbl-key)))
|
|
|
167 (if mod-lbl-key
|
|
|
168 (progn
|
|
|
169 (setq creator (hbdata:creator entry)
|
|
|
170 create-time (hbdata:create-time entry)
|
|
|
171 modifier (let* ((user (user-login-name))
|
|
|
172 (addr (concat user
|
|
|
173 hyperb:host-domain)))
|
|
|
174 (if (equal creator addr)
|
|
|
175 user addr))
|
|
|
176 mod-time (htz:date-sortable-gmt)
|
|
|
177 entry (cons new-key (cdr entry)))
|
|
|
178 (hbdata:delete-entry-at-point)
|
|
|
179 (if (setq lbl-instance (hbdata:instance-last new-key loc dir))
|
|
|
180 (progn
|
|
|
181 (setq lbl-instance (concat ebut:instance-sep
|
|
|
182 (1+ lbl-instance)))
|
|
|
183 ;; This line is needed to ensure that the highest
|
|
|
184 ;; numbered instance of a label appears before
|
|
|
185 ;; other instances, so 'hbdata:instance-last' will work.
|
|
|
186 (if (hbdata:to-entry-buf loc dir) (forward-line 1))))
|
|
|
187 )
|
|
|
188 (let ((inst-num (hbdata:instance-last new-key loc dir)))
|
|
|
189 (setq lbl-instance (if inst-num
|
|
|
190 (hbdata:instance-next
|
|
|
191 (concat new-key ebut:instance-sep
|
|
|
192 (int-to-string inst-num))))))
|
|
|
193 ))
|
|
|
194 (if (or entry (not mod-lbl-key))
|
|
|
195 (cons
|
|
|
196 (list (concat new-key lbl-instance)
|
|
|
197 (hattr:get b 'action)
|
|
|
198 ;; Hyperbole V1 referent compatibility, always nil in V2
|
|
|
199 (hattr:get b 'referent)
|
|
|
200 ;; Save actype without class prefix
|
|
|
201 (let ((actype (hattr:get b 'actype)))
|
|
|
202 (and actype (symbolp actype)
|
|
|
203 (setq actype (symbol-name actype))
|
|
|
204 (intern
|
|
|
205 (substring actype (if (string-match "::" actype)
|
|
|
206 (match-end 0) 0)))))
|
|
|
207 (let ((mail-dir (and (fboundp 'hmail:composing-dir)
|
|
|
208 (hmail:composing-dir l)))
|
|
|
209 (args (hattr:get b 'args)))
|
|
|
210 ;; Replace matches for Emacs Lisp directory variable
|
|
|
211 ;; values with their variable names in any pathname args.
|
|
|
212 (mapcar 'hpath:substitute-var
|
|
|
213 (if mail-dir
|
|
|
214 ;; Make pathname args absolute for outgoing mail and
|
|
|
215 ;; news messages.
|
|
|
216 (action:path-args-abs args mail-dir)
|
|
|
217 args)))
|
|
|
218 (or creator (concat (user-login-name) hyperb:host-domain))
|
|
|
219 (or create-time (htz:date-sortable-gmt))
|
|
|
220 modifier
|
|
|
221 mod-time)
|
|
|
222 lbl-instance)
|
|
|
223 ))))
|
|
|
224
|
|
|
225 (defun hbdata:get-entry (lbl-key key-src &optional directory)
|
|
|
226 "Returns button data entry given by LBL-KEY, KEY-SRC and optional DIRECTORY.
|
|
|
227 Returns nil if no matching entry is found.
|
|
|
228 A button data entry is a list of attribute values. Use methods from
|
|
|
229 class 'hbdata' to operate on the entry."
|
|
|
230 (hbdata:apply-entry
|
|
|
231 (function (lambda () (read (current-buffer))))
|
|
|
232 lbl-key key-src directory))
|
|
|
233
|
|
|
234 (defun hbdata:instance-next (lbl-key)
|
|
|
235 "Returns string for button instance number following LBL-KEY's.
|
|
|
236 nil if LBL-KEY is nil."
|
|
|
237 (and lbl-key
|
|
|
238 (if (string-match
|
|
|
239 (concat (regexp-quote ebut:instance-sep) "[0-9]+$") lbl-key)
|
|
|
240 (concat ebut:instance-sep
|
|
|
241 (int-to-string
|
|
|
242 (1+ (string-to-int
|
|
|
243 (substring lbl-key (1+ (match-beginning 0)))))))
|
|
|
244 ":2")))
|
|
|
245
|
|
|
246 (defun hbdata:instance-last (lbl-key key-src &optional directory)
|
|
|
247 "Returns highest instance number for repeated button label.
|
|
|
248 1 if not repeated, nil if no instance.
|
|
|
249 Takes arguments LBL-KEY, KEY-SRC and optional DIRECTORY."
|
|
|
250 (hbdata:apply-entry
|
|
|
251 (function (lambda ()
|
|
|
252 (if (looking-at "[0-9]+")
|
|
|
253 (string-to-int (buffer-substring (match-beginning 0)
|
|
|
254 (match-end 0)))
|
|
|
255 1)))
|
|
|
256 lbl-key key-src directory nil 'instance))
|
|
|
257
|
|
|
258 (defun hbdata:delete-entry (lbl-key key-src &optional directory)
|
|
|
259 "Deletes button data entry given by LBL-KEY, KEY-SRC and optional DIRECTORY.
|
|
|
260 Returns entry deleted (a list of attribute values) or nil.
|
|
|
261 Use methods from class 'hbdata' to operate on the entry."
|
|
|
262 (hbdata:apply-entry
|
|
|
263 (function
|
|
|
264 (lambda ()
|
|
|
265 (prog1 (read (current-buffer))
|
|
|
266 (let ((empty-file-entry "[ \t\n]*\\(\^L\\|\\'\\)")
|
|
|
267 (kill))
|
|
|
268 (beginning-of-line)
|
|
|
269 (hbdata:delete-entry-at-point)
|
|
|
270 (if (looking-at empty-file-entry)
|
|
|
271 (let ((end (point))
|
|
|
272 (empty-hbdata-file "[ \t\n]*\\'"))
|
|
|
273 (forward-line -1)
|
|
|
274 (if (= (following-char) ?\")
|
|
|
275 ;; Last button entry for filename, so del filename.
|
|
|
276 (progn (forward-line -1) (delete-region (point) end)))
|
|
|
277 (save-excursion
|
|
|
278 (goto-char (point-min))
|
|
|
279 (if (looking-at empty-hbdata-file)
|
|
|
280 (setq kill t)))
|
|
|
281 (if kill
|
|
|
282 (let ((fname buffer-file-name))
|
|
|
283 (erase-buffer) (save-buffer) (kill-buffer nil)
|
|
|
284 (hbmap:dir-remove (file-name-directory fname))
|
|
|
285 (call-process "rm" nil 0 nil "-f" fname)))))))))
|
|
|
286 lbl-key key-src directory))
|
|
|
287
|
|
|
288 (defun hbdata:delete-entry-at-point ()
|
|
|
289 (delete-region (point) (progn (forward-line 1) (point))))
|
|
|
290
|
|
|
291 (defun hbdata:to-entry (but-key key-src &optional directory instance)
|
|
|
292 "Returns button data entry indexed by BUT-KEY, KEY-SRC, optional DIRECTORY.
|
|
|
293 Returns nil if entry is not found. Leaves point at start of entry when
|
|
|
294 successful or where entry should be inserted if unsuccessful.
|
|
|
295 A button entry is a list. Use methods from class 'hbdata' to operate on the
|
|
|
296 entry. Optional INSTANCE non-nil means search for any button instance matching
|
|
|
297 but-key."
|
|
|
298 (let ((pos-entry-cons
|
|
|
299 (hbdata:apply-entry
|
|
|
300 (function
|
|
|
301 (lambda ()
|
|
|
302 (beginning-of-line)
|
|
|
303 (cons (point) (read (current-buffer)))))
|
|
|
304 but-key key-src directory 'create instance)))
|
|
|
305 (hbdata:to-entry-buf key-src directory)
|
|
|
306 (forward-line 1)
|
|
|
307 (if pos-entry-cons
|
|
|
308 (progn
|
|
|
309 (goto-char (car pos-entry-cons))
|
|
|
310 (cdr pos-entry-cons)))))
|
|
|
311
|
|
|
312 ;;; ************************************************************************
|
|
|
313 ;;; Private functions
|
|
|
314 ;;; ************************************************************************
|
|
|
315
|
|
|
316 (defun hbdata:apply-entry (function lbl-key key-src &optional directory
|
|
|
317 create instance)
|
|
|
318 "Invokes FUNCTION with point at hbdata entry given by LBL-KEY, KEY-SRC, optional DIRECTORY.
|
|
|
319 With optional CREATE, if no such line exists, inserts a new file entry at the
|
|
|
320 beginning of the hbdata file (which is created if necessary).
|
|
|
321 INSTANCE non-nil means search for any button instance matching LBL-KEY and
|
|
|
322 call FUNCTION with point right after any 'ebut:instance-sep' in match.
|
|
|
323 Returns value of evaluation when a matching entry is found or nil."
|
|
|
324 (let ((found)
|
|
|
325 (rtn)
|
|
|
326 (opoint)
|
|
|
327 (end-func))
|
|
|
328 (save-excursion
|
|
|
329 (unwind-protect
|
|
|
330 (progn
|
|
|
331 (if (not (bufferp key-src))
|
|
|
332 nil
|
|
|
333 (set-buffer key-src)
|
|
|
334 (cond ((hmail:editor-p)
|
|
|
335 (setq end-func (function (lambda ()
|
|
|
336 (hmail:msg-narrow)))))
|
|
|
337 ((and (hmail:lister-p)
|
|
|
338 (progn (rmail:summ-msg-to) (rmail:to)))
|
|
|
339 (setq opoint (point)
|
|
|
340 key-src (current-buffer)
|
|
|
341 end-func (function (lambda ()
|
|
|
342 (hmail:msg-narrow)
|
|
|
343 (goto-char opoint)
|
|
|
344 (lmail:to)))))
|
|
|
345 ((and (hnews:lister-p)
|
|
|
346 (progn (rnews:summ-msg-to) (rnews:to)))
|
|
|
347 (setq opoint (point)
|
|
|
348 key-src (current-buffer)
|
|
|
349 end-func (function (lambda ()
|
|
|
350 (hmail:msg-narrow)
|
|
|
351 (goto-char opoint)
|
|
|
352 (lnews:to)))))))
|
|
|
353 (setq found (hbdata:to-entry-buf key-src directory create)))
|
|
|
354 (if found
|
|
|
355 (let ((case-fold-search t)
|
|
|
356 (qkey (regexp-quote lbl-key))
|
|
|
357 (end (save-excursion (if (search-forward "\n\^L" nil t)
|
|
|
358 (point) (point-max)))))
|
|
|
359 (if (if instance
|
|
|
360 (re-search-forward
|
|
|
361 (concat "\n(\"" qkey "["
|
|
|
362 ebut:instance-sep "\"]") end t)
|
|
|
363 (search-forward (concat "\n(\"" lbl-key "\"") end t))
|
|
|
364 (progn
|
|
|
365 (or instance (beginning-of-line))
|
|
|
366 (let (buffer-read-only)
|
|
|
367 (setq rtn (funcall function)))))))
|
|
|
368 (if end-func (funcall end-func))))
|
|
|
369 rtn))
|
|
|
370
|
|
|
371 (defun hbdata:to-hbdata-buffer (dir &optional create)
|
|
|
372 "Reads in the file containing DIR's button data, if any, and returns buffer.
|
|
|
373 If it does not exist and optional CREATE is non-nil, creates a new
|
|
|
374 one and returns buffer, otherwise returns nil."
|
|
|
375 (let* ((file (expand-file-name hattr:filename (or dir default-directory)))
|
|
|
376 (existing-file (or (file-exists-p file) (get-file-buffer file)))
|
|
|
377 (buf (or (get-file-buffer file)
|
|
|
378 (and (or create existing-file)
|
|
|
379 (find-file-noselect file)))))
|
|
|
380 (if buf
|
|
|
381 (progn (set-buffer buf)
|
|
|
382 (or (verify-visited-file-modtime (get-file-buffer file))
|
|
|
383 (cond ((yes-or-no-p
|
|
|
384 "Hyperbole button data file has changed, read new contents? ")
|
|
|
385 (revert-buffer t t)
|
|
|
386 )))
|
|
|
387 (or (= (point-max) 1) (eq (char-after 1) ?\^L)
|
|
|
388 (error "File %s is not a valid Hyperbole button data table." file))
|
|
|
389 (or (equal (buffer-name) file) (rename-buffer file))
|
|
|
390 (setq buffer-read-only nil)
|
|
|
391 (or existing-file (hbmap:dir-add (file-name-directory file)))
|
|
|
392 buf))))
|
|
|
393
|
|
|
394
|
|
|
395 (defun hbdata:to-entry-buf (key-src &optional directory create)
|
|
|
396 "Moves point to end of line in but data buffer matching KEY-SRC.
|
|
|
397 Uses hbdata file in KEY-SRC's directory, or optional DIRECTORY or if nil, uses
|
|
|
398 default-directory.
|
|
|
399 With optional CREATE, if no such line exists, inserts a new file entry at the
|
|
|
400 beginning of the hbdata file (which is created if necessary).
|
|
|
401 Returns non-nil if KEY-SRC is found or created, else nil."
|
|
|
402 (let ((rtn) (ln-dir))
|
|
|
403 (if (bufferp key-src)
|
|
|
404 ;; Button buffer has no file attached
|
|
|
405 (progn (setq rtn (set-buffer key-src)
|
|
|
406 buffer-read-only nil)
|
|
|
407 (if (not (hmail:hbdata-to-p))
|
|
|
408 (insert "\n" hmail:hbdata-sep "\n"))
|
|
|
409 (backward-char 1)
|
|
|
410 )
|
|
|
411 (setq directory (or (file-name-directory key-src) directory))
|
|
|
412 (let ((ln-file) (link-p key-src))
|
|
|
413 (while (setq link-p (file-symlink-p link-p))
|
|
|
414 (setq ln-file link-p))
|
|
|
415 (if ln-file
|
|
|
416 (setq ln-dir (file-name-directory ln-file)
|
|
|
417 key-src (file-name-nondirectory ln-file))
|
|
|
418 (setq key-src (file-name-nondirectory key-src))))
|
|
|
419 (if (or (hbdata:to-hbdata-buffer directory create)
|
|
|
420 (and ln-dir (hbdata:to-hbdata-buffer ln-dir nil)
|
|
|
421 (setq create nil
|
|
|
422 directory ln-dir)))
|
|
|
423 (progn
|
|
|
424 (goto-char 1)
|
|
|
425 (cond ((search-forward (concat "\^L\n\"" key-src "\"")
|
|
|
426 nil t)
|
|
|
427 (setq rtn t))
|
|
|
428 (create
|
|
|
429 (setq rtn t)
|
|
|
430 (insert "\^L\n\"" key-src "\"\n")
|
|
|
431 (backward-char 1))
|
|
|
432 ))))
|
|
|
433 rtn
|
|
|
434 ))
|
|
|
435
|
|
|
436 (defun hbdata:write (&optional orig-lbl-key but-sym)
|
|
|
437 "Tries to write Hyperbole button data from optional ORIG-LBL-KEY and BUT-SYM.
|
|
|
438 ORIG-LBL-KEY nil means create a new entry, otherwise modify existing one.
|
|
|
439 BUT-SYM nil means use 'hbut:current'. If successful, returns
|
|
|
440 a button instance string to append to button label or t when first instance.
|
|
|
441 On failure, returns nil."
|
|
|
442 (let ((cns (hbdata:build orig-lbl-key but-sym))
|
|
|
443 entry lbl-instance)
|
|
|
444 (if (or (and buffer-file-name
|
|
|
445 (not (file-writable-p buffer-file-name)))
|
|
|
446 (null cns))
|
|
|
447 nil
|
|
|
448 (setq entry (car cns) lbl-instance (cdr cns))
|
|
|
449 (prin1 entry (current-buffer))
|
|
|
450 (terpri (current-buffer))
|
|
|
451 (or lbl-instance t)
|
|
|
452 )))
|
|
|
453
|
|
|
454
|
|
|
455 ;;; ************************************************************************
|
|
|
456 ;;; Private variables
|
|
|
457 ;;; ************************************************************************
|
|
|
458
|
|
|
459 (provide 'hbdata)
|
