1 ;;; gnus-spec.el --- format spec functions for Gnus
2 ;; Copyright (C) 1996 Free Software Foundation, Inc.
4 ;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
7 ;; This file is part of GNU Emacs.
9 ;; GNU Emacs is free software; you can redistribute it and/or modify
10 ;; it under the terms of the GNU General Public License as published by
11 ;; the Free Software Foundation; either version 2, or (at your option)
14 ;; GNU Emacs is distributed in the hope that it will be useful,
15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 ;; GNU General Public License for more details.
19 ;; You should have received a copy of the GNU General Public License
20 ;; along with GNU Emacs; see the file COPYING. If not, write to the
21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 ;; Boston, MA 02111-1307, USA.
31 ;;; Internal variables.
33 (defvar gnus-summary-mark-positions nil)
34 (defvar gnus-group-mark-positions nil)
35 (defvar gnus-group-indentation "")
37 ;; Format specs. The chunks below are the machine-generated forms
38 ;; that are to be evaled as the result of the default format strings.
39 ;; We write them in here to get them byte-compiled. That way the
40 ;; default actions will be quite fast, while still retaining the full
41 ;; flexibility of the user-defined format specs.
43 ;; First we have lots of dummy defvars to let the compiler know these
44 ;; are really dynamic variables.
46 (defvar gnus-tmp-unread)
47 (defvar gnus-tmp-replied)
48 (defvar gnus-tmp-score-char)
49 (defvar gnus-tmp-indentation)
50 (defvar gnus-tmp-opening-bracket)
51 (defvar gnus-tmp-lines)
52 (defvar gnus-tmp-name)
53 (defvar gnus-tmp-closing-bracket)
54 (defvar gnus-tmp-subject-or-nil)
55 (defvar gnus-tmp-subject)
56 (defvar gnus-tmp-marked)
57 (defvar gnus-tmp-marked-mark)
58 (defvar gnus-tmp-subscribed)
59 (defvar gnus-tmp-process-marked)
60 (defvar gnus-tmp-number-of-unread)
61 (defvar gnus-tmp-group-name)
62 (defvar gnus-tmp-group)
63 (defvar gnus-tmp-article-number)
64 (defvar gnus-tmp-unread-and-unselected)
65 (defvar gnus-tmp-news-method)
66 (defvar gnus-tmp-news-server)
67 (defvar gnus-tmp-article-number)
68 (defvar gnus-mouse-face)
69 (defvar gnus-mouse-face-prop)
71 (defun gnus-summary-line-format-spec ()
72 (insert gnus-tmp-unread gnus-tmp-replied
73 gnus-tmp-score-char gnus-tmp-indentation)
74 (gnus-put-text-property
78 gnus-tmp-opening-bracket
81 (if (> (length gnus-tmp-name) 20)
82 (substring gnus-tmp-name 0 20)
84 gnus-tmp-closing-bracket)
86 gnus-mouse-face-prop gnus-mouse-face)
87 (insert " " gnus-tmp-subject-or-nil "\n"))
89 (defvar gnus-summary-line-format-spec
90 (gnus-byte-code 'gnus-summary-line-format-spec))
92 (defun gnus-summary-dummy-line-format-spec ()
94 (gnus-put-text-property
99 gnus-mouse-face-prop gnus-mouse-face)
100 (insert " " gnus-tmp-subject "\n"))
102 (defvar gnus-summary-dummy-line-format-spec
103 (gnus-byte-code 'gnus-summary-dummy-line-format-spec))
105 (defun gnus-group-line-format-spec ()
106 (insert gnus-tmp-marked-mark gnus-tmp-subscribed
107 gnus-tmp-process-marked
108 gnus-group-indentation
109 (format "%5s: " gnus-tmp-number-of-unread))
110 (gnus-put-text-property
113 (insert gnus-tmp-group "\n")
115 gnus-mouse-face-prop gnus-mouse-face))
116 (defvar gnus-group-line-format-spec
117 (gnus-byte-code 'gnus-group-line-format-spec))
119 (defvar gnus-format-specs
120 `((version . ,emacs-version)
121 (group "%M\%S\%p\%P\%5y: %(%g%)%l\n" ,gnus-group-line-format-spec)
122 (summary-dummy "* %(: :%) %S\n"
123 ,gnus-summary-dummy-line-format-spec)
124 (summary "%U\%R\%z\%I\%(%[%4L: %-20,20n%]%) %s\n"
125 ,gnus-summary-line-format-spec))
126 "Alist of format specs.")
128 (defvar gnus-article-mode-line-format-spec nil)
129 (defvar gnus-summary-mode-line-format-spec nil)
130 (defvar gnus-group-mode-line-format-spec nil)
132 ;;; Phew. All that gruft is over, fortunately.
135 (defun gnus-update-format (var)
136 "Update the format specification near point."
141 ;; Find the end of the current word.
142 (re-search-forward "[ \t\n]" nil t)
144 (when (re-search-backward "\\(gnus-[-a-z]+-line-format\\)" nil t)
146 (let* ((type (intern (progn (string-match "gnus-\\([-a-z]+\\)-line" var)
147 (match-string 1 var))))
148 (entry (assq type gnus-format-specs))
151 (setq gnus-format-specs (delq entry gnus-format-specs)))
153 (intern (format "%s-spec" var))
154 (gnus-parse-format (setq value (symbol-value (intern var)))
155 (symbol-value (intern (format "%s-alist" var)))
156 (not (string-match "mode" var))))
157 (setq spec (symbol-value (intern (format "%s-spec" var))))
158 (push (list type value spec) gnus-format-specs)
160 (pop-to-buffer "*Gnus Format*")
162 (lisp-interaction-mode)
163 (insert (pp-to-string spec))))
165 (defun gnus-update-format-specifications (&optional force &rest types)
166 "Update all (necessary) format specifications."
167 ;; Make the indentation array.
168 ;; See whether all the stored info needs to be flushed.
170 (not (equal emacs-version
171 (cdr (assq 'version gnus-format-specs)))))
172 (setq gnus-format-specs nil))
174 ;; Go through all the formats and see whether they need updating.
175 (let (new-format entry type val)
176 (while (setq type (pop types))
177 ;; Jump to the proper buffer to find out the value of
178 ;; the variable, if possible. (It may be buffer-local.)
180 (let ((buffer (intern (format "gnus-%s-buffer" type)))
182 (when (and (boundp buffer)
183 (setq val (symbol-value buffer))
185 (buffer-name (get-buffer val)))
186 (set-buffer (get-buffer val)))
187 (setq new-format (symbol-value
188 (intern (format "gnus-%s-line-format" type))))))
189 (setq entry (cdr (assq type gnus-format-specs)))
191 (equal (car entry) new-format))
192 ;; Use the old format.
193 (set (intern (format "gnus-%s-line-format-spec" type))
195 ;; This is a new format.
197 (if (not (stringp new-format))
198 ;; This is a function call or something.
200 ;; This is a "real" format.
204 (intern (format "gnus-%s-line-format-alist"
205 (if (eq type 'article-mode)
206 'summary-mode type))))
207 (not (string-match "mode$" (symbol-name type))))))
208 ;; Enter the new format spec into the list.
211 (setcar (cdr entry) val)
212 (setcar entry new-format))
213 (push (list type new-format val) gnus-format-specs))
214 (set (intern (format "gnus-%s-line-format-spec" type)) val))))
216 (unless (assq 'version gnus-format-specs)
217 (push (cons 'version emacs-version) gnus-format-specs)))
219 (defvar gnus-mouse-face-0 'highlight)
220 (defvar gnus-mouse-face-1 'highlight)
221 (defvar gnus-mouse-face-2 'highlight)
222 (defvar gnus-mouse-face-3 'highlight)
223 (defvar gnus-mouse-face-4 'highlight)
225 (defun gnus-mouse-face-function (form type)
226 `(gnus-put-text-property
227 (point) (progn ,@form (point))
231 `(quote ,(symbol-value (intern (format "gnus-mouse-face-%d" type)))))))
233 (defvar gnus-face-0 'bold)
234 (defvar gnus-face-1 'italic)
235 (defvar gnus-face-2 'bold-italic)
236 (defvar gnus-face-3 'bold)
237 (defvar gnus-face-4 'bold)
239 (defun gnus-face-face-function (form type)
240 `(gnus-put-text-property
241 (point) (progn ,@form (point))
242 'face ',(symbol-value (intern (format "gnus-face-%d" type)))))
244 (defun gnus-tilde-max-form (el max-width)
245 "Return a form that limits EL to MAX-WIDTH."
246 (let ((max (abs max-width)))
248 `(if (> (length ,el) ,max)
250 `(substring ,el (- (length el) ,max))
251 `(substring ,el 0 ,max))
253 `(let ((val (eval ,el)))
254 (if (> (length val) ,max)
256 `(substring val (- (length val) ,max))
257 `(substring val 0 ,max))
260 (defun gnus-tilde-cut-form (el cut-width)
261 "Return a form that cuts CUT-WIDTH off of EL."
262 (let ((cut (abs cut-width)))
264 `(if (> (length ,el) ,cut)
266 `(substring ,el 0 (- (length el) ,cut))
267 `(substring ,el ,cut))
269 `(let ((val (eval ,el)))
270 (if (> (length val) ,cut)
272 `(substring val 0 (- (length val) ,cut))
273 `(substring val ,cut))
276 (defun gnus-tilde-ignore-form (el ignore-value)
277 "Return a form that is blank when EL is IGNORE-VALUE."
279 `(if (equal ,el ,ignore-value)
281 `(let ((val (eval ,el)))
282 (if (equal val ,ignore-value)
285 (defun gnus-parse-format (format spec-alist &optional insert)
286 ;; This function parses the FORMAT string with the help of the
287 ;; SPEC-ALIST and returns a list that can be eval'ed to return the
288 ;; string. If the FORMAT string contains the specifiers %( and %)
289 ;; the text between them will have the mouse-face text property.
291 "\\`\\(.*\\)%[0-9]?[{(]\\(.*\\)%[0-9]?[})]\\(.*\n?\\)\\'"
293 (gnus-parse-complex-format format spec-alist)
294 ;; This is a simple format.
295 (gnus-parse-simple-format format spec-alist insert)))
297 (defun gnus-parse-complex-format (format spec-alist)
299 (gnus-set-work-buffer)
301 (goto-char (point-min))
302 (while (re-search-forward "\"" nil t)
303 (replace-match "\\\"" nil t))
304 (goto-char (point-min))
306 (while (re-search-forward "%\\([0-9]+\\)?\\([{}()]\\)" nil t)
307 (let ((number (if (match-beginning 1)
308 (match-string 1) "0"))
309 (delim (aref (match-string 2) 0)))
310 (if (or (= delim ?\() (= delim ?\{))
311 (replace-match (concat "\"(" (if (= delim ?\() "mouse" "face")
313 (replace-match "\")\""))))
314 (goto-char (point-max))
316 (goto-char (point-min))
317 (let ((form (read (current-buffer))))
318 (cons 'progn (gnus-complex-form-to-spec form spec-alist)))))
320 (defun gnus-complex-form-to-spec (form spec-alist)
325 (gnus-parse-simple-format sform spec-alist t)
326 (funcall (intern (format "gnus-%s-face-function" (car sform)))
327 (gnus-complex-form-to-spec (cddr sform) spec-alist)
331 (defun gnus-parse-simple-format (format spec-alist &optional insert)
332 ;; This function parses the FORMAT string with the help of the
333 ;; SPEC-ALIST and returns a list that can be eval'ed to return a
336 spec flist fstring elem result dontinsert user-defined
337 type value pad-width spec-beg cut-width ignore-value
338 tilde-form tilde elem-type)
340 (gnus-set-work-buffer)
342 (goto-char (point-min))
343 (while (re-search-forward "%" nil t)
344 (setq user-defined nil
351 (setq spec-beg (1- (point)))
353 ;; Parse this spec fully.
356 ((looking-at "\\([-.0-9]+\\)\\(,[-0-9]+\\)?")
357 (setq pad-width (string-to-number (match-string 1)))
358 (when (match-beginning 2)
359 (setq max-width (string-to-number (buffer-substring
360 (1+ (match-beginning 2))
362 (goto-char (match-end 0)))
365 (setq tilde (read (current-buffer))
369 ((memq type '(pad pad-left))
370 (setq pad-width value))
371 ((eq type 'pad-right)
372 (setq pad-width (- value)))
373 ((memq type '(max-right max))
374 (setq max-width value))
376 (setq max-width (- value)))
377 ((memq type '(cut cut-left))
378 (setq cut-width value))
379 ((eq type 'cut-right)
380 (setq cut-width (- value)))
383 (if (stringp value) value (format "%s" value))))
385 (setq tilde-form value))
387 (error "Unknown tilde type: %s" tilde)))
391 ;; User-defined spec -- find the spec name.
392 (when (= (setq spec (following-char)) ?u)
394 (setq user-defined (following-char)))
396 (delete-region spec-beg (point))
398 ;; Now we have all the relevant data on this spec, so
399 ;; we start doing stuff.
402 ;; "%%" just results in a "%".
407 (setq elem (list tilde-form ?s)))
408 ;; Treat user defined format specifiers specially.
412 (list (intern (format "gnus-user-format-function-%c"
414 'gnus-tmp-header) ?s)))
415 ;; Find the specification from `spec-alist'.
416 ((setq elem (cdr (assq spec spec-alist))))
418 (setq elem '("*" ?s))))
419 (setq elem-type (cadr elem))
420 ;; Insert the new format elements.
422 (insert (number-to-string pad-width)))
423 ;; Create the form to be evaled.
424 (if (or max-width cut-width ignore-value)
427 (let ((el (car elem)))
428 (cond ((= (cadr elem) ?c)
429 (setq el (list 'char-to-string el)))
431 (setq el (list 'int-to-string el))))
433 (setq el (gnus-tilde-ignore-form el ignore-value)))
435 (setq el (gnus-tilde-cut-form el cut-width)))
437 (setq el (gnus-tilde-max-form el max-width)))
440 (push (car elem) flist))))
441 (setq fstring (buffer-string)))
443 ;; Do some postprocessing to increase efficiency.
448 ((string= fstring "")
450 ;; Not a format string.
451 ((not (string-match "%" fstring))
453 ;; A format string with just a single string spec.
454 ((string= fstring "%s")
456 ;; A single character.
457 ((string= fstring "%c")
460 ((string= fstring "%d")
463 (list `(princ ,(car flist)))
464 (list `(int-to-string ,(car flist)))))
465 ;; Just lots of chars and strings.
466 ((string-match "\\`\\(%[cs]\\)+\\'" fstring)
468 ;; A single string spec at the beginning of the spec.
469 ((string-match "\\`%[sc][^%]+\\'" fstring)
470 (list (car flist) (substring fstring 2)))
471 ;; A single string spec in the middle of the spec.
472 ((string-match "\\`\\([^%]+\\)%[sc]\\([^%]+\\)\\'" fstring)
473 (list (match-string 1 fstring) (car flist) (match-string 2 fstring)))
474 ;; A single string spec in the end of the spec.
475 ((string-match "\\`\\([^%]+\\)%[sc]\\'" fstring)
476 (list (match-string 1 fstring) (car flist)))
477 ;; A more complex spec.
479 (list (cons 'format (cons fstring (nreverse flist)))))))
485 (cons 'insert result)))
486 (cond ((stringp result)
489 (cons 'concat result))
492 (defun gnus-eval-format (format &optional alist props)
493 "Eval the format variable FORMAT, using ALIST.
494 If PROPS, insert the result."
495 (let ((form (gnus-parse-format format alist props)))
497 (gnus-add-text-properties (point) (progn (eval form) (point)) props)
500 (defun gnus-compile ()
501 "Byte-compile the user-defined format specs."
503 (let ((entries gnus-format-specs)
504 (byte-compile-warnings '(unresolved callargs redefine))
507 (gnus-message 7 "Compiling format specs...")
510 (setq entry (pop entries))
511 (if (eq (car entry) 'version)
512 (setq gnus-format-specs (delq entry gnus-format-specs))
513 (when (and (listp (caddr entry))
514 (not (eq 'byte-code (caaddr entry))))
515 (fset 'gnus-tmp-func `(lambda () ,(caddr entry)))
516 (byte-compile 'gnus-tmp-func)
517 (setcar (cddr entry) (gnus-byte-code 'gnus-tmp-func)))))
519 (push (cons 'version emacs-version) gnus-format-specs)
520 ;; Mark the .newsrc.eld file as "dirty".
521 (gnus-dribble-enter " ")
522 (gnus-message 7 "Compiling user specs...done"))))
526 ;;; gnus-spec.el ends here