Merge from origin/emacs-25

2e2a806 Fix copyright years by hand
5badc81 Update copyright year to 2017

1 files changed, 266 insertions, 0 deletions

diff --git a/lisp/gnus/gnus-ems.el b/lisp/gnus/gnus-ems.el
new file mode 100644
index 00000000000..5067fa43cd3
--- /dev/null
+++ b/lisp/gnus/gnus-ems.el
@@ -0,0 +1,266 @@
+;;; gnus-ems.el --- functions for making Gnus work under different Emacsen
+
+;; Copyright (C) 1995-2017 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)
+       (if (fboundp 'display-images-p)
+	   (display-images-p)
+	 t)
+       (image-type-available-p type)))
+
+(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 (or (featurep 'emacs) (fboundp 'set-process-plist))
+      (progn				; these exist since Emacs 22.1
+	(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