1 ;;; gnus-spec.el --- format spec functions for Gnus
2 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
3 ;; Free Software Foundation, Inc.
5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 ;; Boston, MA 02111-1307, USA.
29 (eval-when-compile (require 'cl))
33 (defcustom gnus-use-correct-string-widths (featurep 'xemacs)
34 "*If non-nil, use correct functions for dealing with wide characters."
39 (defcustom gnus-make-format-preserve-properties (featurep 'xemacs)
40 "*If non-nil, use a replacement `format' function which preserves
41 text properties. This is only needed on XEmacs, as FSF Emacs does this anyway."
46 ;;; Internal variables.
48 (defvar gnus-summary-mark-positions nil)
49 (defvar gnus-group-mark-positions nil)
50 (defvar gnus-group-indentation "")
52 ;; Format specs. The chunks below are the machine-generated forms
53 ;; that are to be evaled as the result of the default format strings.
54 ;; We write them in here to get them byte-compiled. That way the
55 ;; default actions will be quite fast, while still retaining the full
56 ;; flexibility of the user-defined format specs.
58 ;; First we have lots of dummy defvars to let the compiler know these
59 ;; are really dynamic variables.
61 (defvar gnus-tmp-unread)
62 (defvar gnus-tmp-replied)
63 (defvar gnus-tmp-score-char)
64 (defvar gnus-tmp-indentation)
65 (defvar gnus-tmp-opening-bracket)
66 (defvar gnus-tmp-lines)
67 (defvar gnus-tmp-name)
68 (defvar gnus-tmp-closing-bracket)
69 (defvar gnus-tmp-subject-or-nil)
70 (defvar gnus-tmp-subject)
71 (defvar gnus-tmp-marked)
72 (defvar gnus-tmp-marked-mark)
73 (defvar gnus-tmp-subscribed)
74 (defvar gnus-tmp-process-marked)
75 (defvar gnus-tmp-number-of-unread)
76 (defvar gnus-tmp-group-name)
77 (defvar gnus-tmp-group)
78 (defvar gnus-tmp-article-number)
79 (defvar gnus-tmp-unread-and-unselected)
80 (defvar gnus-tmp-news-method)
81 (defvar gnus-tmp-news-server)
82 (defvar gnus-tmp-article-number)
83 (defvar gnus-mouse-face)
84 (defvar gnus-mouse-face-prop)
85 (defvar gnus-tmp-header)
86 (defvar gnus-tmp-from)
88 (defun gnus-summary-line-format-spec ()
89 (insert gnus-tmp-unread gnus-tmp-replied
90 gnus-tmp-score-char gnus-tmp-indentation)
91 (gnus-put-text-property
95 (format "%c%4s: %-23s%c" gnus-tmp-opening-bracket gnus-tmp-lines
98 (gnus-summary-from-or-to-or-newsgroups
99 gnus-tmp-header gnus-tmp-from))))
100 (if (> (length val) 23)
103 gnus-tmp-closing-bracket))
105 gnus-mouse-face-prop gnus-mouse-face)
106 (insert " " gnus-tmp-subject-or-nil "\n"))
108 (defvar gnus-summary-line-format-spec
109 (gnus-byte-code 'gnus-summary-line-format-spec))
111 (defun gnus-summary-dummy-line-format-spec ()
113 (gnus-put-text-property
118 gnus-mouse-face-prop gnus-mouse-face)
119 (insert " " gnus-tmp-subject "\n"))
121 (defvar gnus-summary-dummy-line-format-spec
122 (gnus-byte-code 'gnus-summary-dummy-line-format-spec))
124 (defun gnus-group-line-format-spec ()
125 (insert gnus-tmp-marked-mark gnus-tmp-subscribed
126 gnus-tmp-process-marked
127 gnus-group-indentation
128 (format "%5s: " gnus-tmp-number-of-unread))
129 (gnus-put-text-property
132 (insert gnus-tmp-group "\n")
134 gnus-mouse-face-prop gnus-mouse-face))
135 (defvar gnus-group-line-format-spec
136 (gnus-byte-code 'gnus-group-line-format-spec))
138 (defvar gnus-format-specs
139 `((version . ,emacs-version)
140 (gnus-version . ,(gnus-continuum-version))
141 (group "%M\%S\%p\%P\%5y: %(%g%)\n" ,gnus-group-line-format-spec)
142 (summary-dummy "* %(: :%) %S\n"
143 ,gnus-summary-dummy-line-format-spec)
144 (summary "%U%R%z%I%(%[%4L: %-23,23f%]%) %s\n"
145 ,gnus-summary-line-format-spec))
146 "Alist of format specs.")
148 (defvar gnus-default-format-specs gnus-format-specs)
150 (defvar gnus-article-mode-line-format-spec nil)
151 (defvar gnus-summary-mode-line-format-spec nil)
152 (defvar gnus-group-mode-line-format-spec nil)
154 ;;; Phew. All that gruft is over with, fortunately.
157 (defun gnus-update-format (var)
158 "Update the format specification near point."
163 ;; Find the end of the current word.
164 (re-search-forward "[ \t\n]" nil t)
166 (when (re-search-backward "\\(gnus-[-a-z]+-line-format\\)" nil t)
168 (let* ((type (intern (progn (string-match "gnus-\\([-a-z]+\\)-line" var)
169 (match-string 1 var))))
170 (entry (assq type gnus-format-specs))
173 (setq gnus-format-specs (delq entry gnus-format-specs)))
175 (intern (format "%s-spec" var))
176 (gnus-parse-format (setq value (symbol-value (intern var)))
177 (symbol-value (intern (format "%s-alist" var)))
178 (not (string-match "mode" var))))
179 (setq spec (symbol-value (intern (format "%s-spec" var))))
180 (push (list type value spec) gnus-format-specs)
182 (pop-to-buffer "*Gnus Format*")
184 (lisp-interaction-mode)
185 (insert (gnus-pp-to-string spec))))
187 (defun gnus-update-format-specifications (&optional force &rest types)
188 "Update all (necessary) format specifications.
189 Return a list of updated types."
190 ;; Make the indentation array.
191 ;; See whether all the stored info needs to be flushed.
193 (not gnus-newsrc-file-version)
194 (not (equal (gnus-continuum-version)
195 (gnus-continuum-version gnus-newsrc-file-version)))
196 (not (equal emacs-version
197 (cdr (assq 'version gnus-format-specs)))))
198 (setq gnus-format-specs nil))
199 ;; Flush the group format spec cache if there's the grouplens stuff.
200 (let ((spec (assq 'group gnus-format-specs)))
201 (when (and (memq 'group types)
202 (string-match " gnus-tmp-grouplens[ )]"
203 (gnus-prin1-to-string (cdr spec))))
204 (setq gnus-format-specs (delq spec gnus-format-specs))))
206 ;; Go through all the formats and see whether they need updating.
207 (let (new-format entry type val updated)
208 (while (setq type (pop types))
209 ;; Jump to the proper buffer to find out the value of the
210 ;; variable, if possible. (It may be buffer-local.)
212 (let ((buffer (intern (format "gnus-%s-buffer" type))))
213 (when (and (boundp buffer)
214 (setq val (symbol-value buffer))
215 (gnus-buffer-exists-p val))
217 (setq new-format (symbol-value
218 (intern (format "gnus-%s-line-format" type)))))
219 (setq entry (cdr (assq type gnus-format-specs)))
221 (equal (car entry) new-format))
222 ;; Use the old format.
223 (set (intern (format "gnus-%s-line-format-spec" type))
225 ;; This is a new format.
227 (if (not (stringp new-format))
228 ;; This is a function call or something.
230 ;; This is a "real" format.
234 (intern (format "gnus-%s-line-format-alist" type)))
235 (not (string-match "mode$" (symbol-name type))))))
236 ;; Enter the new format spec into the list.
239 (setcar (cdr entry) val)
240 (setcar entry new-format))
241 (push (list type new-format val) gnus-format-specs))
242 (set (intern (format "gnus-%s-line-format-spec" type)) val)
243 (push type updated))))
245 (unless (assq 'version gnus-format-specs)
246 (push (cons 'version emacs-version) gnus-format-specs))
249 (defvar gnus-mouse-face-0 'highlight)
250 (defvar gnus-mouse-face-1 'highlight)
251 (defvar gnus-mouse-face-2 'highlight)
252 (defvar gnus-mouse-face-3 'highlight)
253 (defvar gnus-mouse-face-4 'highlight)
255 (defun gnus-mouse-face-function (form type)
256 `(gnus-put-text-property
257 (point) (progn ,@form (point))
261 `(quote ,(symbol-value (intern (format "gnus-mouse-face-%d" type)))))))
263 (defvar gnus-face-0 'bold)
264 (defvar gnus-face-1 'italic)
265 (defvar gnus-face-2 'bold-italic)
266 (defvar gnus-face-3 'bold)
267 (defvar gnus-face-4 'bold)
269 (defun gnus-face-face-function (form type)
270 `(gnus-add-text-properties
271 (point) (progn ,@form (point))
272 '(gnus-face t face ,(symbol-value (intern (format "gnus-face-%d" type))))))
274 (defun gnus-balloon-face-function (form type)
275 `(gnus-put-text-property
276 (point) (progn ,@form (point))
277 ,(if (fboundp 'balloon-help-mode)
280 ,(intern (format "gnus-balloon-face-%d" type))))
282 (defun gnus-spec-tab (column)
284 `(insert-char ? (max (- ,column (current-column)) 0))
285 (let ((column (abs column)))
286 `(if (> (current-column) ,column)
288 (if (= (move-to-column ,column) ,column)
289 (delete-region (point) end)
290 (delete-region (1- (point)) end)
292 (insert-char ? (max (- ,column (current-column)) 0))))))
294 (defun gnus-correct-length (string)
295 "Return the correct width of STRING."
297 (mapcar (lambda (char) (incf length (char-width char))) string)
300 (defun gnus-correct-substring (string start &optional end)
305 (length (length string))
306 (string (concat string "\0")))
307 ;; Find the start position.
308 (while (and (< seek length)
310 (incf wseek (char-width (aref string seek)))
313 ;; Find the end position.
314 (while (and (<= seek length)
317 (incf wseek (char-width (aref string seek)))
320 (substring string wstart (1- wend))))
322 (defun gnus-string-width-function ()
324 (gnus-use-correct-string-widths
325 'gnus-correct-length)
326 ((fboundp 'string-width)
331 (defun gnus-substring-function ()
333 (gnus-use-correct-string-widths
334 'gnus-correct-substring)
335 ((fboundp 'string-width)
336 'gnus-correct-substring)
340 (defun gnus-tilde-max-form (el max-width)
341 "Return a form that limits EL to MAX-WIDTH."
342 (let ((max (abs max-width))
343 (length-fun (gnus-string-width-function))
344 (substring-fun (gnus-substring-function)))
346 `(if (> (,length-fun ,el) ,max)
348 `(,substring-fun ,el (- (,length-fun ,el) ,max))
349 `(,substring-fun ,el 0 ,max))
351 `(let ((val (eval ,el)))
352 (if (> (,length-fun val) ,max)
354 `(,substring-fun val (- (,length-fun val) ,max))
355 `(,substring-fun val 0 ,max))
358 (defun gnus-tilde-cut-form (el cut-width)
359 "Return a form that cuts CUT-WIDTH off of EL."
360 (let ((cut (abs cut-width))
361 (length-fun (gnus-string-width-function))
362 (substring-fun (gnus-substring-function)))
364 `(if (> (,length-fun ,el) ,cut)
366 `(,substring-fun ,el 0 (- (,length-fun ,el) ,cut))
367 `(,substring-fun ,el ,cut))
369 `(let ((val (eval ,el)))
370 (if (> (,length-fun val) ,cut)
372 `(,substring-fun val 0 (- (,length-fun val) ,cut))
373 `(,substring-fun val ,cut))
376 (defun gnus-tilde-ignore-form (el ignore-value)
377 "Return a form that is blank when EL is IGNORE-VALUE."
379 `(if (equal ,el ,ignore-value)
381 `(let ((val (eval ,el)))
382 (if (equal val ,ignore-value)
385 (defun gnus-pad-form (el pad-width)
386 "Return a form that pads EL to PAD-WIDTH accounting for multi-column
387 characters correctly. This is because `format' may pad to columns or to
388 characters when given a pad value."
389 (let ((pad (abs pad-width))
390 (side (< 0 pad-width))
391 (length-fun (gnus-string-width-function)))
393 `(let ((need (- ,pad (,length-fun ,el))))
395 (concat ,(when side '(make-string need ?\ ))
397 ,(when (not side) '(make-string need ?\ )))
399 `(let* ((val (eval ,el))
400 (need (- ,pad (,length-fun val))))
402 (concat ,(when side '(make-string need ?\ ))
404 ,(when (not side) '(make-string need ?\ )))
407 (defun gnus-parse-format (format spec-alist &optional insert)
408 ;; This function parses the FORMAT string with the help of the
409 ;; SPEC-ALIST and returns a list that can be eval'ed to return the
410 ;; string. If the FORMAT string contains the specifiers %( and %)
411 ;; the text between them will have the mouse-face text property.
412 ;; If the FORMAT string contains the specifiers %[ and %], the text between
413 ;; them will have the balloon-help text property.
414 (let ((case-fold-search nil))
416 "\\`\\(.*\\)%[0-9]?[{(«]\\(.*\\)%[0-9]?[»})]\\(.*\n?\\)\\'\\|%[-0-9]*=\\|%[-0-9]*\\*"
418 (gnus-parse-complex-format format spec-alist)
419 ;; This is a simple format.
420 (gnus-parse-simple-format format spec-alist insert))))
422 (defun gnus-parse-complex-format (format spec-alist)
423 (let ((cursor-spec nil))
425 (gnus-set-work-buffer)
427 (goto-char (point-min))
428 (while (re-search-forward "\"" nil t)
429 (replace-match "\\\"" nil t))
430 (goto-char (point-min))
432 ;; Convert all font specs into font spec lists.
433 (while (re-search-forward "%\\([0-9]+\\)?\\([«»{}()]\\)" nil t)
434 (let ((number (if (match-beginning 1)
435 (match-string 1) "0"))
436 (delim (aref (match-string 2) 0)))
437 (if (or (= delim ?\()
440 (replace-match (concat "\"("
441 (cond ((= delim ?\() "mouse")
442 ((= delim ?\{) "face")
446 (replace-match "\")\""))))
447 (goto-char (point-max))
449 ;; Convert point position commands.
450 (goto-char (point-min))
451 (let ((case-fold-search nil))
452 (while (re-search-forward "%\\([-0-9]+\\)?\\*" nil t)
453 (replace-match "\"(point)\"" t t)
454 (setq cursor-spec t)))
455 ;; Convert TAB commands.
456 (goto-char (point-min))
457 (while (re-search-forward "%\\([-0-9]+\\)=" nil t)
458 (replace-match (format "\"(tab %s)\"" (match-string 1)) t t))
459 ;; Convert the buffer into the spec.
460 (goto-char (point-min))
461 (let ((form (read (current-buffer))))
463 `(let (gnus-position)
464 ,@(gnus-complex-form-to-spec form spec-alist)
466 (gnus-put-text-property gnus-position (1+ gnus-position)
469 ,@(gnus-complex-form-to-spec form spec-alist)))))))
471 (defun gnus-complex-form-to-spec (form spec-alist)
477 (gnus-parse-simple-format sform spec-alist t))
478 ((eq (car sform) 'point)
479 '(setq gnus-position (point)))
480 ((eq (car sform) 'tab)
481 (gnus-spec-tab (cadr sform)))
483 (funcall (intern (format "gnus-%s-face-function" (car sform)))
484 (gnus-complex-form-to-spec (cddr sform) spec-alist)
489 (defun gnus-xmas-format (fstring &rest args)
490 "A version of `format' which preserves text properties.
492 Required for XEmacs, where the built in `format' function strips all text
493 properties from both the format string and any inserted strings.
495 Only supports the format sequence %s, and %% for inserting
496 literal % characters. A pad width and an optional - (to right pad)
497 are supported for %s."
498 (let ((re "%%\\|%\\(-\\)?\\([1-9][0-9]*\\)?s")
502 (goto-char (point-min))
503 (while (re-search-forward re nil t)
504 (goto-char (match-end 0))
506 ((string= (match-string 0) "%%")
510 (error 'wrong-number-of-arguments #'my-format n fstring))
511 (let* ((minlen (string-to-int (or (match-string 2) "")))
513 (str (if (stringp arg) arg (format "%s" arg)))
514 (lpad (null (match-string 1)))
515 (padlen (max 0 (- minlen (length str)))))
517 (if lpad (insert-char ?\ padlen))
519 (unless lpad (insert-char ?\ padlen))
520 (setq args (cdr args))))))
523 (defun gnus-parse-simple-format (format spec-alist &optional insert)
524 ;; This function parses the FORMAT string with the help of the
525 ;; SPEC-ALIST and returns a list that can be eval'ed to return a
528 spec flist fstring elem result dontinsert user-defined
529 type value pad-width spec-beg cut-width ignore-value
530 tilde-form tilde elem-type extended-spec)
532 (gnus-set-work-buffer)
534 (goto-char (point-min))
535 (while (re-search-forward "%" nil t)
536 (setq user-defined nil
544 (setq spec-beg (1- (point)))
546 ;; Parse this spec fully.
549 ((looking-at "\\([-.0-9]+\\)\\(,[-0-9]+\\)?")
550 (setq pad-width (string-to-number (match-string 1)))
551 (when (match-beginning 2)
552 (setq max-width (string-to-number (buffer-substring
553 (1+ (match-beginning 2))
555 (goto-char (match-end 0)))
558 (setq tilde (read (current-buffer))
562 ((memq type '(pad pad-left))
563 (setq pad-width value))
564 ((eq type 'pad-right)
565 (setq pad-width (- value)))
566 ((memq type '(max-right max))
567 (setq max-width value))
569 (setq max-width (- value)))
570 ((memq type '(cut cut-left))
571 (setq cut-width value))
572 ((eq type 'cut-right)
573 (setq cut-width (- value)))
576 (if (stringp value) value (format "%s" value))))
578 (setq tilde-form value))
580 (error "Unknown tilde type: %s" tilde)))
585 ;; User-defined spec -- find the spec name.
586 ((eq (setq spec (char-after)) ?u)
588 (when (and (eq (setq user-defined (char-after)) ?&)
589 (looking-at "&\\([^;]+\\);"))
590 (setq user-defined (match-string 1))
591 (goto-char (match-end 1))))
593 ((and (eq spec ?&) (looking-at "&\\([^;]+\\);"))
594 (setq extended-spec (intern (match-string 1)))
595 (goto-char (match-end 1))))
597 (delete-region spec-beg (point))
599 ;; Now we have all the relevant data on this spec, so
600 ;; we start doing stuff.
603 ;; "%%" just results in a "%".
608 (setq elem (list tilde-form ?s)))
609 ;; Treat user defined format specifiers specially.
613 (list (intern (format
614 (if (stringp user-defined)
615 "gnus-user-format-function-%s"
616 "gnus-user-format-function-%c")
620 ;; Find the specification from `spec-alist'.
621 ((setq elem (cdr (assq (or extended-spec spec) spec-alist))))
622 ;; We used to use "%l" for displaying the grouplens score.
624 (setq elem '("" ?s)))
626 (setq elem '("*" ?s))))
627 (setq elem-type (cadr elem))
628 ;; Insert the new format elements.
630 (not (and (featurep 'xemacs)
631 gnus-use-correct-string-widths)))
632 (insert (number-to-string pad-width)))
633 ;; Create the form to be evaled.
634 (if (or max-width cut-width ignore-value
635 (and (featurep 'xemacs)
636 gnus-use-correct-string-widths))
639 (let ((el (car elem)))
640 (cond ((= (cadr elem) ?c)
641 (setq el (list 'char-to-string el)))
643 (setq el (list 'int-to-string el))))
645 (setq el (gnus-tilde-ignore-form el ignore-value)))
647 (setq el (gnus-tilde-cut-form el cut-width)))
649 (setq el (gnus-tilde-max-form el max-width)))
651 (setq el (gnus-pad-form el pad-width)))
654 (push (car elem) flist))))
655 (setq fstring (buffer-substring-no-properties (point-min) (point-max))))
657 ;; Do some postprocessing to increase efficiency.
662 ((string= fstring "")
664 ;; Not a format string.
665 ((not (string-match "%" fstring))
667 ;; A format string with just a single string spec.
668 ((string= fstring "%s")
670 ;; A single character.
671 ((string= fstring "%c")
674 ((string= fstring "%d")
677 (list `(princ ,(car flist)))
678 (list `(int-to-string ,(car flist)))))
679 ;; Just lots of chars and strings.
680 ((string-match "\\`\\(%[cs]\\)+\\'" fstring)
682 ;; A single string spec at the beginning of the spec.
683 ((string-match "\\`%[sc][^%]+\\'" fstring)
684 (list (car flist) (substring fstring 2)))
685 ;; A single string spec in the middle of the spec.
686 ((string-match "\\`\\([^%]+\\)%[sc]\\([^%]+\\)\\'" fstring)
687 (list (match-string 1 fstring) (car flist) (match-string 2 fstring)))
688 ;; A single string spec in the end of the spec.
689 ((string-match "\\`\\([^%]+\\)%[sc]\\'" fstring)
690 (list (match-string 1 fstring) (car flist)))
691 ;; Only string (and %) specs (XEmacs only!)
692 ((and (featurep 'xemacs)
693 gnus-make-format-preserve-properties
695 "\\`\\([^%]*\\(%%\\|%-?\\([1-9][0-9]*\\)?s\\)\\)*[^%]*\\'"
697 (list (cons 'gnus-xmas-format (cons fstring (nreverse flist)))))
698 ;; A more complex spec.
700 (list (cons 'format (cons fstring (nreverse flist)))))))
706 (cons 'insert result)))
707 (cond ((stringp result)
710 (cons 'concat result))
713 (defun gnus-eval-format (format &optional alist props)
714 "Eval the format variable FORMAT, using ALIST.
715 If PROPS, insert the result."
716 (let ((form (gnus-parse-format format alist props)))
718 (gnus-add-text-properties (point) (progn (eval form) (point)) props)
721 (defun gnus-compile ()
722 "Byte-compile the user-defined format specs."
725 (let ((entries gnus-format-specs)
726 (byte-compile-warnings '(unresolved callargs redefine))
729 (gnus-message 7 "Compiling format specs...")
732 (setq entry (pop entries))
733 (if (memq (car entry) '(gnus-version version))
734 (setq gnus-format-specs (delq entry gnus-format-specs))
735 (let ((form (caddr entry)))
736 (when (and (listp form)
737 ;; Under GNU Emacs, it's (byte-code ...)
738 (not (eq 'byte-code (car form)))
739 ;; Under XEmacs, it's (funcall #<compiled-function ...>)
740 (not (and (eq 'funcall (car form))
741 (byte-code-function-p (cadr form)))))
742 (defalias 'gnus-tmp-func `(lambda () ,form))
743 (byte-compile 'gnus-tmp-func)
744 (setcar (cddr entry) (gnus-byte-code 'gnus-tmp-func))))))
746 (push (cons 'version emacs-version) gnus-format-specs)
747 ;; Mark the .newsrc.eld file as "dirty".
749 (gnus-message 7 "Compiling user specs...done"))))
751 (defun gnus-set-format (type &optional insertable)
752 (set (intern (format "gnus-%s-line-format-spec" type))
754 (symbol-value (intern (format "gnus-%s-line-format" type)))
755 (symbol-value (intern (format "gnus-%s-line-format-alist" type)))
761 ;; coding: iso-8859-1
764 ;;; arch-tag: a4328fa1-1f84-4b09-97ad-4b5767cfd50f
765 ;;; gnus-spec.el ends here