lisp/gnus/gnus-spec.el

   1 ;;; gnus-spec.el --- format spec functions for Gnus  -*- coding: iso-latin-1 -*-
   2 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000
   3 ;;        Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;; Keywords: news
   7
   8 ;; This file is part of GNU Emacs.
   9
  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)
  13 ;; any later version.
  14
  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.
  19
  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.
  24
  25 ;;; Commentary:
  26
  27 ;;; Code:
  28
  29 (eval-when-compile (require 'cl))
  30
  31 (require 'gnus)
  32
  33 ;;; Internal variables.
  34
  35 (defvar gnus-summary-mark-positions nil)
  36 (defvar gnus-group-mark-positions nil)
  37 (defvar gnus-group-indentation "")
  38
  39 ;; Format specs.  The chunks below are the machine-generated forms
  40 ;; that are to be evaled as the result of the default format strings.
  41 ;; We write them in here to get them byte-compiled.  That way the
  42 ;; default actions will be quite fast, while still retaining the full
  43 ;; flexibility of the user-defined format specs.
  44
  45 ;; First we have lots of dummy defvars to let the compiler know these
  46 ;; are really dynamic variables.
  47
  48 (defvar gnus-tmp-unread)
  49 (defvar gnus-tmp-replied)
  50 (defvar gnus-tmp-score-char)
  51 (defvar gnus-tmp-indentation)
  52 (defvar gnus-tmp-opening-bracket)
  53 (defvar gnus-tmp-lines)
  54 (defvar gnus-tmp-name)
  55 (defvar gnus-tmp-closing-bracket)
  56 (defvar gnus-tmp-subject-or-nil)
  57 (defvar gnus-tmp-subject)
  58 (defvar gnus-tmp-marked)
  59 (defvar gnus-tmp-marked-mark)
  60 (defvar gnus-tmp-subscribed)
  61 (defvar gnus-tmp-process-marked)
  62 (defvar gnus-tmp-number-of-unread)
  63 (defvar gnus-tmp-group-name)
  64 (defvar gnus-tmp-group)
  65 (defvar gnus-tmp-article-number)
  66 (defvar gnus-tmp-unread-and-unselected)
  67 (defvar gnus-tmp-news-method)
  68 (defvar gnus-tmp-news-server)
  69 (defvar gnus-tmp-article-number)
  70 (defvar gnus-mouse-face)
  71 (defvar gnus-mouse-face-prop)
  72
  73 (defun gnus-summary-line-format-spec ()
  74   (insert gnus-tmp-unread gnus-tmp-replied
  75           gnus-tmp-score-char gnus-tmp-indentation)
  76   (gnus-put-text-property
  77    (point)
  78    (progn
  79      (insert
  80       gnus-tmp-opening-bracket
  81       (format "%4d: %-20s"
  82               gnus-tmp-lines
  83               (if (> (length gnus-tmp-name) 20)
  84                   (substring gnus-tmp-name 0 20)
  85                 gnus-tmp-name))
  86       gnus-tmp-closing-bracket)
  87      (point))
  88    gnus-mouse-face-prop gnus-mouse-face)
  89   (insert " " gnus-tmp-subject-or-nil "\n"))
  90
  91 (defvar gnus-summary-line-format-spec
  92   (gnus-byte-code 'gnus-summary-line-format-spec))
  93
  94 (defun gnus-summary-dummy-line-format-spec ()
  95   (insert "*  ")
  96   (gnus-put-text-property
  97    (point)
  98    (progn
  99      (insert ":                          :")
 100      (point))
 101    gnus-mouse-face-prop gnus-mouse-face)
 102   (insert " " gnus-tmp-subject "\n"))
 103
 104 (defvar gnus-summary-dummy-line-format-spec
 105   (gnus-byte-code 'gnus-summary-dummy-line-format-spec))
 106
 107 (defun gnus-group-line-format-spec ()
 108   (insert gnus-tmp-marked-mark gnus-tmp-subscribed
 109           gnus-tmp-process-marked
 110           gnus-group-indentation
 111           (format "%5s: " gnus-tmp-number-of-unread))
 112   (gnus-put-text-property
 113    (point)
 114    (progn
 115      (insert gnus-tmp-group "\n")
 116      (1- (point)))
 117    gnus-mouse-face-prop gnus-mouse-face))
 118 (defvar gnus-group-line-format-spec
 119   (gnus-byte-code 'gnus-group-line-format-spec))
 120
 121 (defvar gnus-format-specs
 122   `((version . ,emacs-version)
 123     (group "%M\%S\%p\%P\%5y: %(%g%)%l\n" ,gnus-group-line-format-spec)
 124     (summary-dummy "*  %(:                          :%) %S\n"
 125                    ,gnus-summary-dummy-line-format-spec)
 126     (summary "%U\%R\%z\%I\%(%[%4L: %-20,20n%]%) %s\n"
 127              ,gnus-summary-line-format-spec))
 128   "Alist of format specs.")
 129
 130 (defvar gnus-article-mode-line-format-spec nil)
 131 (defvar gnus-summary-mode-line-format-spec nil)
 132 (defvar gnus-group-mode-line-format-spec nil)
 133
 134 ;;; Phew.  All that gruft is over, fortunately.
 135
 136 ;;;###autoload
 137 (defun gnus-update-format (var)
 138   "Update the format specification near point."
 139   (interactive
 140    (list
 141     (save-excursion
 142       (eval-defun nil)
 143       ;; Find the end of the current word.
 144       (re-search-forward "[ \t\n]" nil t)
 145       ;; Search backward.
 146       (when (re-search-backward "\\(gnus-[-a-z]+-line-format\\)" nil t)
 147         (match-string 1)))))
 148   (let* ((type (intern (progn (string-match "gnus-\\([-a-z]+\\)-line" var)
 149                               (match-string 1 var))))
 150          (entry (assq type gnus-format-specs))
 151          value spec)
 152     (when entry
 153       (setq gnus-format-specs (delq entry gnus-format-specs)))
 154     (set
 155      (intern (format "%s-spec" var))
 156      (gnus-parse-format (setq value (symbol-value (intern var)))
 157                         (symbol-value (intern (format "%s-alist" var)))
 158                         (not (string-match "mode" var))))
 159     (setq spec (symbol-value (intern (format "%s-spec" var))))
 160     (push (list type value spec) gnus-format-specs)
 161
 162     (pop-to-buffer "*Gnus Format*")
 163     (erase-buffer)
 164     (lisp-interaction-mode)
 165     (insert (pp-to-string spec))))
 166
 167 (defun gnus-update-format-specifications (&optional force &rest types)
 168   "Update all (necessary) format specifications."
 169   ;; Make the indentation array.
 170   ;; See whether all the stored info needs to be flushed.
 171   (when (or force
 172             (not (equal emacs-version
 173                         (cdr (assq 'version gnus-format-specs)))))
 174     (setq gnus-format-specs nil))
 175
 176   ;; Go through all the formats and see whether they need updating.
 177   (let (new-format entry type val)
 178     (while (setq type (pop types))
 179       ;; Jump to the proper buffer to find out the value of
 180       ;; the variable, if possible.  (It may be buffer-local.)
 181       (save-excursion
 182         (let ((buffer (intern (format "gnus-%s-buffer" type)))
 183               val)
 184           (when (and (boundp buffer)
 185                      (setq val (symbol-value buffer))
 186                      (gnus-buffer-exists-p val))
 187             (set-buffer val))
 188           (setq new-format (symbol-value
 189                             (intern (format "gnus-%s-line-format" type)))))
 190         (setq entry (cdr (assq type gnus-format-specs)))
 191         (if (and (car entry)
 192                  (equal (car entry) new-format))
 193             ;; Use the old format.
 194             (set (intern (format "gnus-%s-line-format-spec" type))
 195                  (cadr entry))
 196           ;; This is a new format.
 197           (setq val
 198                 (if (not (stringp new-format))
 199                     ;; This is a function call or something.
 200                     new-format
 201                   ;; This is a "real" format.
 202                   (gnus-parse-format
 203                    new-format
 204                    (symbol-value
 205                     (intern (format "gnus-%s-line-format-alist" type)))
 206                    (not (string-match "mode$" (symbol-name type))))))
 207           ;; Enter the new format spec into the list.
 208           (if entry
 209               (progn
 210                 (setcar (cdr entry) val)
 211                 (setcar entry new-format))
 212             (push (list type new-format val) gnus-format-specs))
 213           (set (intern (format "gnus-%s-line-format-spec" type)) val)))))
 214
 215   (unless (assq 'version gnus-format-specs)
 216     (push (cons 'version emacs-version) gnus-format-specs)))
 217
 218 (defvar gnus-mouse-face-0 'highlight)
 219 (defvar gnus-mouse-face-1 'highlight)
 220 (defvar gnus-mouse-face-2 'highlight)
 221 (defvar gnus-mouse-face-3 'highlight)
 222 (defvar gnus-mouse-face-4 'highlight)
 223
 224 (defun gnus-mouse-face-function (form type)
 225   `(gnus-put-text-property
 226     (point) (progn ,@form (point))
 227     gnus-mouse-face-prop
 228     ,(if (equal type 0)
 229          'gnus-mouse-face
 230        `(quote ,(symbol-value (intern (format "gnus-mouse-face-%d" type)))))))
 231
 232 (defvar gnus-face-0 'bold)
 233 (defvar gnus-face-1 'italic)
 234 (defvar gnus-face-2 'bold-italic)
 235 (defvar gnus-face-3 'bold)
 236 (defvar gnus-face-4 'bold)
 237
 238 (defun gnus-face-face-function (form type)
 239   `(gnus-add-text-properties
 240     (point) (progn ,@form (point))
 241     '(gnus-face t face ,(symbol-value (intern (format "gnus-face-%d" type))))))
 242
 243 (defun gnus-balloon-face-function (form type)
 244   `(gnus-put-text-property
 245     (point) (progn ,@form (point))
 246     'balloon-help
 247     ,(intern (format "gnus-balloon-face-%d" type))))
 248
 249 (defun gnus-tilde-max-form (el max-width)
 250   "Return a form that limits EL to MAX-WIDTH."
 251   (let ((max (abs max-width)))
 252     (if (symbolp el)
 253         `(if (> (length ,el) ,max)
 254              ,(if (< max-width 0)
 255                   `(substring ,el (- (length el) ,max))
 256                 `(substring ,el 0 ,max))
 257            ,el)
 258       `(let ((val (eval ,el)))
 259          (if (> (length val) ,max)
 260              ,(if (< max-width 0)
 261                   `(substring val (- (length val) ,max))
 262                 `(substring val 0 ,max))
 263            val)))))
 264
 265 (defun gnus-tilde-cut-form (el cut-width)
 266   "Return a form that cuts CUT-WIDTH off of EL."
 267   (let ((cut (abs cut-width)))
 268     (if (symbolp el)
 269         `(if (> (length ,el) ,cut)
 270              ,(if (< cut-width 0)
 271                   `(substring ,el 0 (- (length el) ,cut))
 272                 `(substring ,el ,cut))
 273            ,el)
 274       `(let ((val (eval ,el)))
 275          (if (> (length val) ,cut)
 276              ,(if (< cut-width 0)
 277                   `(substring val 0 (- (length val) ,cut))
 278                 `(substring val ,cut))
 279            val)))))
 280
 281 (defun gnus-tilde-ignore-form (el ignore-value)
 282   "Return a form that is blank when EL is IGNORE-VALUE."
 283   (if (symbolp el)
 284       `(if (equal ,el ,ignore-value)
 285            "" ,el)
 286     `(let ((val (eval ,el)))
 287        (if (equal val ,ignore-value)
 288            "" val))))
 289
 290 (defun gnus-parse-format (format spec-alist &optional insert)
 291   ;; This function parses the FORMAT string with the help of the
 292   ;; SPEC-ALIST and returns a list that can be eval'ed to return the
 293   ;; string.  If the FORMAT string contains the specifiers %( and %)
 294   ;; the text between them will have the mouse-face text property.
 295   ;; If the FORMAT string contains the specifiers %[ and %], the text between
 296   ;; them will have the balloon-help text property.
 297   (if (string-match
 298        "\\`\\(.*\\)%[0-9]?[{(«]\\(.*\\)%[0-9]?[»})]\\(.*\n?\\)\\'"
 299        format)
 300       (gnus-parse-complex-format format spec-alist)
 301     ;; This is a simple format.
 302     (gnus-parse-simple-format format spec-alist insert)))
 303
 304 (defun gnus-parse-complex-format (format spec-alist)
 305   (save-excursion
 306     (gnus-set-work-buffer)
 307     (insert format)
 308     (goto-char (point-min))
 309     (while (re-search-forward "\"" nil t)
 310       (replace-match "\\\"" nil t))
 311     (goto-char (point-min))
 312     (insert "(\"")
 313     (while (re-search-forward "%\\([0-9]+\\)?\\([«»{}()]\\)" nil t)
 314       (let ((number (if (match-beginning 1)
 315                         (match-string 1) "0"))
 316             (delim (aref (match-string 2) 0)))
 317         (if (or (= delim ?\()
 318                 (= delim ?\{)
 319                 (= delim ?\«))
 320             (replace-match (concat "\"("
 321                                    (cond ((= delim ?\() "mouse")
 322                                          ((= delim ?\{) "face")
 323                                          (t "balloon"))
 324                                    " " number " \""))
 325           (replace-match "\")\""))))
 326     (goto-char (point-max))
 327     (insert "\")")
 328     (goto-char (point-min))
 329     (let ((form (read (current-buffer))))
 330       (cons 'progn (gnus-complex-form-to-spec form spec-alist)))))
 331
 332 (defun gnus-complex-form-to-spec (form spec-alist)
 333   (delq nil
 334         (mapcar
 335          (lambda (sform)
 336            (if (stringp sform)
 337                (gnus-parse-simple-format sform spec-alist t)
 338              (funcall (intern (format "gnus-%s-face-function" (car sform)))
 339                       (gnus-complex-form-to-spec (cddr sform) spec-alist)
 340                       (nth 1 sform))))
 341          form)))
 342
 343 (defun gnus-parse-simple-format (format spec-alist &optional insert)
 344   ;; This function parses the FORMAT string with the help of the
 345   ;; SPEC-ALIST and returns a list that can be eval'ed to return a
 346   ;; string.
 347   (let ((max-width 0)
 348         spec flist fstring elem result dontinsert user-defined
 349         type value pad-width spec-beg cut-width ignore-value
 350         tilde-form tilde elem-type)
 351     (save-excursion
 352       (gnus-set-work-buffer)
 353       (insert format)
 354       (goto-char (point-min))
 355       (while (re-search-forward "%" nil t)
 356         (setq user-defined nil
 357               spec-beg nil
 358               pad-width nil
 359               max-width nil
 360               cut-width nil
 361               ignore-value nil
 362               tilde-form nil)
 363         (setq spec-beg (1- (point)))
 364
 365         ;; Parse this spec fully.
 366         (while
 367             (cond
 368              ((looking-at "\\([-.0-9]+\\)\\(,[-0-9]+\\)?")
 369               (setq pad-width (string-to-number (match-string 1)))
 370               (when (match-beginning 2)
 371                 (setq max-width (string-to-number (buffer-substring
 372                                                    (1+ (match-beginning 2))
 373                                                    (match-end 2)))))
 374               (goto-char (match-end 0)))
 375              ((looking-at "~")
 376               (forward-char 1)
 377               (setq tilde (read (current-buffer))
 378                     type (car tilde)
 379                     value (cadr tilde))
 380               (cond
 381                ((memq type '(pad pad-left))
 382                 (setq pad-width value))
 383                ((eq type 'pad-right)
 384                 (setq pad-width (- value)))
 385                ((memq type '(max-right max))
 386                 (setq max-width value))
 387                ((eq type 'max-left)
 388                 (setq max-width (- value)))
 389                ((memq type '(cut cut-left))
 390                 (setq cut-width value))
 391                ((eq type 'cut-right)
 392                 (setq cut-width (- value)))
 393                ((eq type 'ignore)
 394                 (setq ignore-value
 395                       (if (stringp value) value (format "%s" value))))
 396                ((eq type 'form)
 397                 (setq tilde-form value))
 398                (t
 399                 (error "Unknown tilde type: %s" tilde)))
 400               t)
 401              (t
 402               nil)))
 403         ;; User-defined spec -- find the spec name.
 404         (when (eq (setq spec (char-after)) ?u)
 405           (forward-char 1)
 406           (setq user-defined (char-after)))
 407         (forward-char 1)
 408         (delete-region spec-beg (point))
 409
 410         ;; Now we have all the relevant data on this spec, so
 411         ;; we start doing stuff.
 412         (insert "%")
 413         (if (eq spec ?%)
 414             ;; "%%" just results in a "%".
 415             (insert "%")
 416           (cond
 417            ;; Do tilde forms.
 418            ((eq spec ?@)
 419             (setq elem (list tilde-form ?s)))
 420            ;; Treat user defined format specifiers specially.
 421            (user-defined
 422             (setq elem
 423                   (list
 424                    (list (intern (format "gnus-user-format-function-%c"
 425                                          user-defined))
 426                          'gnus-tmp-header)
 427                    ?s)))
 428            ;; Find the specification from `spec-alist'.
 429            ((setq elem (cdr (assq spec spec-alist))))
 430            (t
 431             (setq elem '("*" ?s))))
 432           (setq elem-type (cadr elem))
 433           ;; Insert the new format elements.
 434           (when pad-width
 435             (insert (number-to-string pad-width)))
 436           ;; Create the form to be evaled.
 437           (if (or max-width cut-width ignore-value)
 438               (progn
 439                 (insert ?s)
 440                 (let ((el (car elem)))
 441                   (cond ((= (cadr elem) ?c)
 442                          (setq el (list 'char-to-string el)))
 443                         ((= (cadr elem) ?d)
 444                          (setq el (list 'int-to-string el))))
 445                   (when ignore-value
 446                     (setq el (gnus-tilde-ignore-form el ignore-value)))
 447                   (when cut-width
 448                     (setq el (gnus-tilde-cut-form el cut-width)))
 449                   (when max-width
 450                     (setq el (gnus-tilde-max-form el max-width)))
 451                   (push el flist)))
 452             (insert elem-type)
 453             (push (car elem) flist))))
 454       (setq fstring (buffer-string)))
 455
 456     ;; Do some postprocessing to increase efficiency.
 457     (setq
 458      result
 459      (cond
 460       ;; Emptyness.
 461       ((string= fstring "")
 462        nil)
 463       ;; Not a format string.
 464       ((not (string-match "%" fstring))
 465        (list fstring))
 466       ;; A format string with just a single string spec.
 467       ((string= fstring "%s")
 468        (list (car flist)))
 469       ;; A single character.
 470       ((string= fstring "%c")
 471        (list (car flist)))
 472       ;; A single number.
 473       ((string= fstring "%d")
 474        (setq dontinsert)
 475        (if insert
 476            (list `(princ ,(car flist)))
 477          (list `(int-to-string ,(car flist)))))
 478       ;; Just lots of chars and strings.
 479       ((string-match "\\`\\(%[cs]\\)+\\'" fstring)
 480        (nreverse flist))
 481       ;; A single string spec at the beginning of the spec.
 482       ((string-match "\\`%[sc][^%]+\\'" fstring)
 483        (list (car flist) (substring fstring 2)))
 484       ;; A single string spec in the middle of the spec.
 485       ((string-match "\\`\\([^%]+\\)%[sc]\\([^%]+\\)\\'" fstring)
 486        (list (match-string 1 fstring) (car flist) (match-string 2 fstring)))
 487       ;; A single string spec in the end of the spec.
 488       ((string-match "\\`\\([^%]+\\)%[sc]\\'" fstring)
 489        (list (match-string 1 fstring) (car flist)))
 490       ;; A more complex spec.
 491       (t
 492        (list (cons 'format (cons fstring (nreverse flist)))))))
 493
 494     (if insert
 495         (when result
 496           (if dontinsert
 497               result
 498             (cons 'insert result)))
 499       (cond ((stringp result)
 500              result)
 501             ((consp result)
 502              (cons 'concat result))
 503             (t "")))))
 504
 505 (defun gnus-eval-format (format &optional alist props)
 506   "Eval the format variable FORMAT, using ALIST.
 507 If PROPS, insert the result."
 508   (let ((form (gnus-parse-format format alist props)))
 509     (if props
 510         (gnus-add-text-properties (point) (progn (eval form) (point)) props)
 511       (eval form))))
 512
 513 (defun gnus-compile ()
 514   "Byte-compile the user-defined format specs."
 515   (interactive)
 516   (require 'bytecomp)
 517   (let ((entries gnus-format-specs)
 518         (byte-compile-warnings '(unresolved callargs redefine))
 519         entry gnus-tmp-func)
 520     (save-excursion
 521       (gnus-message 7 "Compiling format specs...")
 522
 523       (while entries
 524         (setq entry (pop entries))
 525         (if (eq (car entry) 'version)
 526             (setq gnus-format-specs (delq entry gnus-format-specs))
 527           (let ((form (caddr entry)))
 528             (when (and (listp form)
 529                        ;; Under GNU Emacs, it's (byte-code ...)
 530                        (not (eq 'byte-code (car form)))
 531                        ;; Under XEmacs, it's (funcall #<compiled-function ...>)
 532                        (not (and (eq 'funcall (car form))
 533                                  (byte-code-function-p (cadr form)))))
 534               (fset 'gnus-tmp-func `(lambda () ,form))
 535               (byte-compile 'gnus-tmp-func)
 536               (setcar (cddr entry) (gnus-byte-code 'gnus-tmp-func))))))
 537
 538       (push (cons 'version emacs-version) gnus-format-specs)
 539       ;; Mark the .newsrc.eld file as "dirty".
 540       (gnus-dribble-touch)
 541       (gnus-message 7 "Compiling user specs...done"))))
 542
 543 (defun gnus-set-format (type &optional insertable)
 544   (set (intern (format "gnus-%s-line-format-spec" type))
 545        (gnus-parse-format
 546         (symbol-value (intern (format "gnus-%s-line-format" type)))
 547         (symbol-value (intern (format "gnus-%s-line-format-alist" type)))
 548         insertable)))
 549
 550 (provide 'gnus-spec)
 551
 552 ;; Local Variables:
 553 ;; coding: iso-8859-1
 554 ;; End:
 555
 556 ;;; arch-tag: a4328fa1-1f84-4b09-97ad-4b5767cfd50f
 557 ;;; gnus-spec.el ends here