lisp/gnus/gnus-ems.el

   1 ;;; gnus-ems.el --- functions for making Gnus work under different Emacsen
   2 ;; Copyright (C) 1995, 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 ;;; Function aliases later to be redefined for XEmacs usage.
  32
  33 (defvar gnus-mouse-2 [mouse-2])
  34 (defvar gnus-down-mouse-3 [down-mouse-3])
  35 (defvar gnus-down-mouse-2 [down-mouse-2])
  36 (defvar gnus-widget-button-keymap nil)
  37 (defvar gnus-mode-line-modified
  38   (if (or (featurep 'xemacs)
  39           (< emacs-major-version 20))
  40       '("--**-" . "-----")
  41     '("**" "--")))
  42
  43 (eval-and-compile
  44   (autoload 'gnus-xmas-define "gnus-xmas")
  45   (autoload 'gnus-xmas-redefine "gnus-xmas")
  46   (autoload 'appt-select-lowest-window "appt"))
  47
  48 (if (featurep 'xemacs)
  49     (autoload 'gnus-smiley-display "smiley")
  50   (autoload 'gnus-smiley-display "smiley-ems") ; override XEmacs version
  51 )
  52
  53 (defun gnus-kill-all-overlays ()
  54   "Delete all overlays in the current buffer."
  55   (let* ((overlayss (overlay-lists))
  56          (buffer-read-only nil)
  57          (overlays (delq nil (nconc (car overlayss) (cdr overlayss)))))
  58     (while overlays
  59       (delete-overlay (pop overlays)))))
  60
  61 ;;; Mule functions.
  62
  63 (defun gnus-mule-max-width-function (el max-width)
  64   `(let* ((val (eval (, el)))
  65           (valstr (if (numberp val)
  66                       (int-to-string val) val)))
  67      (if (> (length valstr) ,max-width)
  68          (truncate-string-to-width valstr ,max-width)
  69        valstr)))
  70
  71 (eval-and-compile
  72   (if (featurep 'xemacs)
  73       (gnus-xmas-define)
  74     (defvar gnus-mouse-face-prop 'mouse-face
  75       "Property used for highlighting mouse regions.")))
  76
  77 (eval-and-compile
  78   (let ((case-fold-search t))
  79     (cond
  80      ((string-match "windows-nt\\|os/2\\|emx\\|cygwin32"
  81                     (symbol-name system-type))
  82       (setq nnheader-file-name-translation-alist
  83             (append nnheader-file-name-translation-alist
  84                     (mapcar (lambda (c) (cons c ?_))
  85                             '(?: ?* ?\" ?< ?> ??))
  86                     '((?+ . ?-))))))))
  87
  88 (defvar gnus-tmp-unread)
  89 (defvar gnus-tmp-replied)
  90 (defvar gnus-tmp-score-char)
  91 (defvar gnus-tmp-indentation)
  92 (defvar gnus-tmp-opening-bracket)
  93 (defvar gnus-tmp-lines)
  94 (defvar gnus-tmp-name)
  95 (defvar gnus-tmp-closing-bracket)
  96 (defvar gnus-tmp-subject-or-nil)
  97
  98 (defun gnus-ems-redefine ()
  99   (cond
 100    ((featurep 'xemacs)
 101     (gnus-xmas-redefine))
 102
 103    ((featurep 'mule)
 104     ;; Mule and new Emacs definitions
 105
 106     ;; [Note] Now there are three kinds of mule implementations,
 107     ;; original MULE, XEmacs/mule and Emacs 20+ including
 108     ;; MULE features.  Unfortunately these API are different.  In
 109     ;; particular, Emacs (including original MULE) and XEmacs are
 110     ;; quite different.  Howvere, this version of Gnus doesn't support
 111     ;; anything other than XEmacs 20+ and Emacs 20.3+.
 112
 113     ;; Predicates to check are following:
 114     ;; (boundp 'MULE) is t only if MULE (original; anything older than
 115     ;;                     Mule 2.3) is running.
 116     ;; (featurep 'mule) is t when every mule variants are running.
 117
 118     ;; It is possible to detect XEmacs/mule by (featurep 'mule) and
 119     ;; checking `emacs-version'.  In this case, the implementation for
 120     ;; XEmacs/mule may be shareable between XEmacs and XEmacs/mule.
 121
 122     (defvar gnus-summary-display-table nil
 123       "Display table used in summary mode buffers.")
 124     (defalias 'gnus-max-width-function 'gnus-mule-max-width-function)
 125
 126     (when (boundp 'gnus-check-before-posting)
 127       (setq gnus-check-before-posting
 128             (delq 'long-lines
 129                   (delq 'control-chars gnus-check-before-posting))))
 130
 131     (defun gnus-summary-line-format-spec ()
 132       (insert gnus-tmp-unread gnus-tmp-replied
 133               gnus-tmp-score-char gnus-tmp-indentation)
 134       (put-text-property
 135        (point)
 136        (progn
 137          (insert
 138           gnus-tmp-opening-bracket
 139           (format "%4d: %-20s"
 140                   gnus-tmp-lines
 141                   (if (> (length gnus-tmp-name) 20)
 142                       (truncate-string-to-width gnus-tmp-name 20)
 143                     gnus-tmp-name))
 144           gnus-tmp-closing-bracket)
 145          (point))
 146        gnus-mouse-face-prop gnus-mouse-face)
 147       (insert " " gnus-tmp-subject-or-nil "\n")))))
 148
 149 (defun gnus-region-active-p ()
 150   "Say whether the region is active."
 151   (and (boundp 'transient-mark-mode)
 152        transient-mark-mode
 153        (boundp 'mark-active)
 154        mark-active))
 155
 156 (if (fboundp 'add-minor-mode)
 157     (defalias 'gnus-add-minor-mode 'add-minor-mode)
 158   (defun gnus-add-minor-mode (mode name map &rest rest)
 159     (set (make-local-variable mode) t)
 160     (unless (assq mode minor-mode-alist)
 161       (push `(,mode ,name) minor-mode-alist))
 162     (unless (assq mode minor-mode-map-alist)
 163       (push (cons mode map)
 164             minor-mode-map-alist))))
 165
 166 (defun gnus-x-splash ()
 167   "Show a splash screen using a pixmap in the current buffer."
 168   (let ((dir (nnheader-find-etc-directory "gnus"))
 169         pixmap file height beg i)
 170     (save-excursion
 171       (switch-to-buffer (gnus-get-buffer-create gnus-group-buffer))
 172       (let ((buffer-read-only nil)
 173             width height)
 174         (erase-buffer)
 175         (when (and dir
 176                    (file-exists-p (setq file
 177                                         (expand-file-name "x-splash" dir))))
 178           (with-temp-buffer
 179             (insert-file-contents file)
 180             (goto-char (point-min))
 181             (ignore-errors
 182               (setq pixmap (read (current-buffer))))))
 183         (when pixmap
 184           (make-face 'gnus-splash)
 185           (setq height (/ (car pixmap) (frame-char-height))
 186                 width (/ (cadr pixmap) (frame-char-width)))
 187           (set-face-foreground 'gnus-splash "Brown")
 188           (set-face-stipple 'gnus-splash pixmap)
 189           (insert-char ?\n (* (/ (window-height) 2 height) height))
 190           (setq i height)
 191           (while (> i 0)
 192             (insert-char ?\  (* (/ (window-width) 2 width) width))
 193             (setq beg (point))
 194             (insert-char ?\  width)
 195             (set-text-properties beg (point) '(face gnus-splash))
 196             (insert ?\n)
 197             (decf i))
 198           (goto-char (point-min))
 199           (sit-for 0))))))
 200
 201 (defvar gnus-article-xface-ring-internal nil
 202   "Cache for face data.")
 203
 204 ;; Worth customizing?
 205 (defvar gnus-article-xface-ring-size 6
 206   "Length of the ring used for `gnus-article-xface-ring-internal'.")
 207
 208 (defvar gnus-article-compface-xbm
 209   (eq 0 (string-match "#define" (shell-command-to-string "uncompface -X")))
 210   "Non-nil means the compface program supports the -X option.
 211 That produces XBM output.")
 212
 213 (defun gnus-article-display-xface (beg end)
 214   "Display an XFace header from between BEG and END in the current article.
 215 Requires support for images in your Emacs and the external programs
 216 `uncompface', and `icontopbm'.  On a GNU/Linux system these
 217 might be in packages with names like `compface' or `faces-xface' and
 218 `netpbm' or `libgr-progs', for instance.  See also
 219 `gnus-article-compface-xbm'.
 220
 221 This function is for Emacs 21+.  See `gnus-xmas-article-display-xface'
 222 for XEmacs."
 223   ;; It might be worth converting uncompface's output in Lisp.
 224
 225   (when (if (fboundp 'display-graphic-p)
 226             (display-graphic-p))
 227     (unless gnus-article-xface-ring-internal ; Only load ring when needed.
 228       (setq gnus-article-xface-ring-internal
 229             (make-ring gnus-article-xface-ring-size)))
 230     (save-excursion
 231       (let* ((cur (current-buffer))
 232              (data (buffer-substring beg end))
 233              (image (cdr-safe (assoc data (ring-elements
 234                                            gnus-article-xface-ring-internal))))
 235              default-enable-multibyte-characters)
 236         (unless image
 237           (with-temp-buffer
 238             (insert data)
 239             (and (eq 0 (apply #'call-process-region (point-min) (point-max)
 240                               "uncompface"
 241                               'delete '(t nil) nil
 242                               (if gnus-article-compface-xbm
 243                                   '("-X"))))
 244                  (if gnus-article-compface-xbm
 245                      t
 246                    (goto-char (point-min))
 247                    (progn (insert "/* Width=48, Height=48 */\n") t)
 248                    (eq 0 (call-process-region (point-min) (point-max)
 249                                               "icontopbm"
 250                                               'delete '(t nil))))
 251                  ;; Miles Bader says that faces don't look right as
 252                  ;; light on dark.
 253                  (if (eq 'dark (cdr-safe (assq 'background-mode
 254                                                (frame-parameters))))
 255                      (setq image (create-image (buffer-string)
 256                                                (if gnus-article-compface-xbm
 257                                                    'xbm
 258                                                  'pbm)
 259                                                t
 260                                                :ascent 'center
 261                                                :foreground "black"
 262                                                :background "white"))
 263                    (setq image (create-image (buffer-string)
 264                                              (if gnus-article-compface-xbm
 265                                                  'xbm
 266                                                'pbm)
 267                                              t
 268                                              :ascent 'center)))))
 269           (ring-insert gnus-article-xface-ring-internal (cons data image)))
 270         (when image
 271           (goto-char (point-min))
 272           (re-search-forward "^From:" nil 'move)
 273           (insert-image image))))))
 274
 275 (provide 'gnus-ems)
 276
 277 ;;; gnus-ems.el ends here