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;;; gnus-ems.el --- functions for making Gnus work under different Emacsen
;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
;; 2004, 2005, 2006 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Keywords: news
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;;; Code:
(eval-when-compile
(require 'cl)
(require 'ring))
;;; Function aliases later to be redefined for XEmacs usage.
(defvar gnus-mouse-2 [mouse-2])
(defvar gnus-down-mouse-3 [down-mouse-3])
(defvar gnus-down-mouse-2 [down-mouse-2])
(defvar gnus-widget-button-keymap nil)
(defvar gnus-mode-line-modified
(if (or (featurep 'xemacs)
(< emacs-major-version 20))
'("--**-" . "-----")
'("**" "--")))
(eval-and-compile
(autoload 'gnus-xmas-define "gnus-xmas")
(autoload 'gnus-xmas-redefine "gnus-xmas")
(autoload 'appt-select-lowest-window "appt")
(autoload 'gnus-get-buffer-create "gnus")
(autoload 'nnheader-find-etc-directory "nnheader"))
(autoload 'smiley-region "smiley")
;; Fixme: shouldn't require message
(autoload 'message-text-with-property "message")
(defun gnus-kill-all-overlays ()
"Delete all overlays in the current buffer."
(let* ((overlayss (overlay-lists))
(buffer-read-only nil)
(overlays (delq nil (nconc (car overlayss) (cdr overlayss)))))
(while overlays
(delete-overlay (pop overlays)))))
;;; Mule functions.
(defun gnus-mule-max-width-function (el max-width)
`(let* ((val (eval (, el)))
(valstr (if (numberp val)
(int-to-string val) val)))
(if (> (length valstr) ,max-width)
(truncate-string-to-width valstr ,max-width)
valstr)))
(eval-and-compile
(defalias 'gnus-char-width
(if (fboundp 'char-width)
'char-width
(lambda (ch) 1)))) ;; A simple hack.
(eval-and-compile
(if (featurep 'xemacs)
(gnus-xmas-define)
(defvar gnus-mouse-face-prop 'mouse-face
"Property used for highlighting mouse regions.")))
(eval-when-compile
(defvar gnus-tmp-unread)
(defvar gnus-tmp-replied)
(defvar gnus-tmp-score-char)
(defvar gnus-tmp-indentation)
(defvar gnus-tmp-opening-bracket)
(defvar gnus-tmp-lines)
(defvar gnus-tmp-name)
(defvar gnus-tmp-closing-bracket)
(defvar gnus-tmp-subject-or-nil)
(defvar gnus-check-before-posting)
(defvar gnus-mouse-face)
(defvar gnus-group-buffer))
(defun gnus-ems-redefine ()
(cond
((featurep 'xemacs)
(gnus-xmas-redefine))
((featurep 'mule)
;; Mule and new Emacs definitions
;; [Note] Now there are three kinds of mule implementations,
;; original MULE, XEmacs/mule and Emacs 20+ including
;; MULE features. Unfortunately these APIs are different. In
;; particular, Emacs (including original Mule) and XEmacs are
;; quite different. However, this version of Gnus doesn't support
;; anything other than XEmacs 20+ and Emacs 20.3+.
;; Predicates to check are following:
;; (boundp 'MULE) is t only if Mule (original; anything older than
;; Mule 2.3) is running.
;; (featurep 'mule) is t when other mule variants are running.
;; It is possible to detect XEmacs/mule by (featurep 'mule) and
;; (featurep 'xemacs). In this case, the implementation for
;; XEmacs/mule may be shareable between XEmacs and XEmacs/mule.
(defvar gnus-summary-display-table nil
"Display table used in summary mode buffers.")
(defalias 'gnus-max-width-function 'gnus-mule-max-width-function)
(when (boundp 'gnus-check-before-posting)
(setq gnus-check-before-posting
(delq 'long-lines
(delq 'control-chars gnus-check-before-posting))))
(defun gnus-summary-line-format-spec ()
(insert gnus-tmp-unread gnus-tmp-replied
gnus-tmp-score-char gnus-tmp-indentation)
(put-text-property
(point)
(progn
(insert
gnus-tmp-opening-bracket
(format "%4d: %-20s"
gnus-tmp-lines
(if (> (length gnus-tmp-name) 20)
(truncate-string-to-width gnus-tmp-name 20)
gnus-tmp-name))
gnus-tmp-closing-bracket)
(point))
gnus-mouse-face-prop gnus-mouse-face)
(insert " " gnus-tmp-subject-or-nil "\n")))))
(defun gnus-region-active-p ()
"Say whether the region is active."
(and (boundp 'transient-mark-mode)
transient-mark-mode
(boundp 'mark-active)
mark-active))
(defun gnus-mark-active-p ()
"Non-nil means the mark and region are currently active in this buffer."
mark-active) ; aliased to region-exists-p in XEmacs.
(if (fboundp 'add-minor-mode)
(defalias 'gnus-add-minor-mode 'add-minor-mode)
(defun gnus-add-minor-mode (mode name map &rest rest)
(set (make-local-variable mode) t)
(unless (assq mode minor-mode-alist)
(push `(,mode ,name) minor-mode-alist))
(unless (assq mode minor-mode-map-alist)
(push (cons mode map)
minor-mode-map-alist))))
(defun gnus-x-splash ()
"Show a splash screen using a pixmap in the current buffer."
(let ((dir (nnheader-find-etc-directory "gnus"))
pixmap file height beg i)
(save-excursion
(switch-to-buffer (gnus-get-buffer-create gnus-group-buffer))
(let ((buffer-read-only nil)
width height)
(erase-buffer)
(when (and dir
(file-exists-p (setq file
(expand-file-name "x-splash" dir))))
(let ((coding-system-for-read 'raw-text)
default-enable-multibyte-characters)
(with-temp-buffer
(insert-file-contents file)
(goto-char (point-min))
(ignore-errors
(setq pixmap (read (current-buffer)))))))
(when pixmap
(make-face 'gnus-splash)
(setq height (/ (car pixmap) (frame-char-height))
width (/ (cadr pixmap) (frame-char-width)))
(set-face-foreground 'gnus-splash "Brown")
(set-face-stipple 'gnus-splash pixmap)
(insert-char ?\n (* (/ (window-height) 2 height) height))
(setq i height)
(while (> i 0)
(insert-char ?\ (* (/ (window-width) 2 width) width))
(setq beg (point))
(insert-char ?\ width)
(set-text-properties beg (point) '(face gnus-splash))
(insert ?\n)
(decf i))
(goto-char (point-min))
(sit-for 0))))))
;;; Image functions.
(defun gnus-image-type-available-p (type)
(and (fboundp 'image-type-available-p)
(image-type-available-p type)
(if (fboundp 'display-images-p)
(display-images-p)
t)))
(defun gnus-create-image (file &optional type data-p &rest props)
(let ((face (plist-get props :face)))
(when face
(setq props (plist-put props :foreground (face-foreground face)))
(setq props (plist-put props :background (face-background face))))
(apply 'create-image file type data-p props)))
(defun gnus-put-image (glyph &optional string category)
(let ((point (point)))
(insert-image glyph (or string " "))
(put-text-property point (point) 'gnus-image-category category)
(unless string
(put-text-property (1- (point)) (point)
'gnus-image-text-deletable t))
glyph))
(defun gnus-remove-image (image &optional category)
(dolist (position (message-text-with-property 'display))
(when (and (equal (get-text-property position 'display) image)
(equal (get-text-property position 'gnus-image-category)
category))
(put-text-property position (1+ position) 'display nil)
(when (get-text-property position 'gnus-image-text-deletable)
(delete-region position (1+ position))))))
(provide 'gnus-ems)
;;; arch-tag: e7360b45-14b5-4171-aa39-69a44aed3cdb
;;; gnus-ems.el ends here
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