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;;; gnus-ems.el --- functions for making Gnus work under different Emacsen
;; Copyright (C) 1995-2013 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
;;; 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 (featurep 'xemacs)
'("--**-" . "-----")
'("**" "--")))
(eval-and-compile
(autoload 'gnus-xmas-define "gnus-xmas")
(autoload 'gnus-xmas-redefine "gnus-xmas"))
(autoload 'gnus-get-buffer-create "gnus")
(autoload 'nnheader-find-etc-directory "nnheader")
(autoload 'smiley-region "smiley")
(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
(if (featurep 'xemacs)
(gnus-xmas-define)
(defvar gnus-mouse-face-prop 'mouse-face
"Property used for highlighting mouse regions.")))
(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")))))
;; Clone of `appt-select-lowest-window' in appt.el.
(defun gnus-select-lowest-window ()
"Select the lowest window on the frame."
(let ((lowest-window (selected-window))
(bottom-edge (nth 3 (window-edges))))
(walk-windows (lambda (w)
(let ((next-bottom-edge (nth 3 (window-edges w))))
(when (< bottom-edge next-bottom-edge)
(setq bottom-edge next-bottom-edge
lowest-window w)))))
(select-window lowest-window)))
(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.
(autoload 'gnus-alive-p "gnus-util")
(autoload 'mm-disable-multibyte "mm-util")
;;; 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))))
(ignore-errors
(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)
"Remove the image matching IMAGE and CATEGORY found first."
(let ((start (point-min))
val end)
(while (and (not end)
(or (setq val (get-text-property start 'display))
(and (setq start
(next-single-property-change start 'display))
(setq val (get-text-property start 'display)))))
(setq end (or (next-single-property-change start 'display)
(point-max)))
(if (and (equal val image)
(equal (get-text-property start 'gnus-image-category)
category))
(progn
(put-text-property start end 'display nil)
(when (get-text-property start 'gnus-image-text-deletable)
(delete-region start end)))
(unless (= end (point-max))
(setq start end
end nil))))))
(defmacro gnus-string-mark-left-to-right (string)
(if (fboundp 'bidi-string-mark-left-to-right)
`(bidi-string-mark-left-to-right ,string)
string))
(eval-and-compile
;; XEmacs does not have window-inside-pixel-edges
(defalias 'gnus-window-inside-pixel-edges
(if (fboundp 'window-inside-pixel-edges)
'window-inside-pixel-edges
'window-pixel-edges))
(if (fboundp 'set-process-plist)
(progn
(defalias 'gnus-set-process-plist 'set-process-plist)
(defalias 'gnus-process-plist 'process-plist)
(defalias 'gnus-process-get 'process-get)
(defalias 'gnus-process-put 'process-put))
(defun gnus-set-process-plist (process plist)
"Replace the plist of PROCESS with PLIST. Returns PLIST."
(put 'gnus-process-plist-internal process plist))
(defun gnus-process-plist (process)
"Return the plist of PROCESS."
;; This form works but can't prevent the plist data from
;; growing infinitely.
;;(get 'gnus-process-plist-internal process)
(let* ((plist (symbol-plist 'gnus-process-plist-internal))
(tem (memq process plist)))
(prog1
(cadr tem)
;; Remove it from the plist data.
(when tem
(if (eq plist tem)
(progn
(setcar plist (caddr plist))
(setcdr plist (or (cdddr plist) '(nil))))
(setcdr (nthcdr (- (length plist) (length tem) 1) plist)
(cddr tem)))))))
(defun gnus-process-get (process propname)
"Return the value of PROCESS' PROPNAME property.
This is the last value stored with `(gnus-process-put PROCESS PROPNAME VALUE)'."
(plist-get (gnus-process-plist process) propname))
(defun gnus-process-put (process propname value)
"Change PROCESS' PROPNAME property to VALUE.
It can be retrieved with `(gnus-process-get PROCESS PROPNAME)'."
(gnus-set-process-plist process
(plist-put (gnus-process-plist process)
propname value)))))
(provide 'gnus-ems)
;;; gnus-ems.el ends here
|
