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+;;; gnus-ems.el --- functions for making Gnus work under different Emacsen
+;; Copyright (C) 1995,96,97 Free Software Foundation, Inc.
+
+;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
+;; 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., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;;; Code:
+
+(eval-when-compile (require 'cl))
+
+;;; Function aliases later to be redefined for XEmacs usage.
+
+(defvar gnus-xemacs (string-match "XEmacs\\|Lucid" emacs-version)
+  "Non-nil if running under XEmacs.")
+
+(defvar gnus-mouse-2 [mouse-2])
+(defvar gnus-down-mouse-2 [down-mouse-2])
+
+(eval-and-compile
+  (autoload 'gnus-xmas-define "gnus-xmas")
+  (autoload 'gnus-xmas-redefine "gnus-xmas")
+  (autoload 'appt-select-lowest-window "appt.el"))
+
+(or (fboundp 'mail-file-babyl-p)
+    (fset 'mail-file-babyl-p 'rmail-file-p))
+
+;;; Mule functions.
+
+(defun gnus-mule-cite-add-face (number prefix face)
+  ;; At line NUMBER, ignore PREFIX and add FACE to the rest of the line.
+  (when face
+    (let ((inhibit-point-motion-hooks t)
+	  from to)
+      (goto-line number)
+      (if (boundp 'MULE)
+	  (forward-char (chars-in-string prefix))
+	(forward-char (length prefix)))
+      (skip-chars-forward " \t")
+      (setq from (point))
+      (end-of-line 1)
+      (skip-chars-backward " \t")
+      (setq to (point))
+      (when (< from to)
+	(gnus-overlay-put (gnus-make-overlay from to) 'face face)))))
+
+(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 valstr (, max-width))
+	 valstr))))
+
+(eval-and-compile
+  (if (string-match "XEmacs\\|Lucid" emacs-version)
+      nil
+
+    (defvar gnus-mouse-face-prop 'mouse-face
+      "Property used for highlighting mouse regions.")
+
+    (defvar gnus-article-x-face-command
+      "{ echo '/* Width=48, Height=48 */'; uncompface; } | icontopbm | xv -quit -"
+      "String or function to be executed to display an X-Face header.
+If it is a string, the command will be executed in a sub-shell
+asynchronously.	 The compressed face will be piped to this command."))
+
+  (cond
+   ((string-match "XEmacs\\|Lucid" emacs-version)
+    (gnus-xmas-define))
+
+   ((or (not (boundp 'emacs-minor-version))
+	(< emacs-minor-version 30))
+    ;; Remove the `intangible' prop.
+    (let ((props (and (boundp 'gnus-hidden-properties)
+		      gnus-hidden-properties)))
+      (while (and props (not (eq (car (cdr props)) 'intangible)))
+	(setq props (cdr props)))
+      (when props
+	(setcdr props (cdr (cdr (cdr props))))))
+    (unless (fboundp 'buffer-substring-no-properties)
+      (defun buffer-substring-no-properties (beg end)
+	(format "%s" (buffer-substring beg end)))))
+
+   ((boundp 'MULE)
+    (provide 'gnusutil))))
+
+(eval-and-compile
+  (cond
+   ((not window-system)
+    (defun gnus-dummy-func (&rest args))
+    (let ((funcs '(mouse-set-point set-face-foreground
+				   set-face-background x-popup-menu)))
+      (while funcs
+	(unless (fboundp (car funcs))
+	  (fset (car funcs) 'gnus-dummy-func))
+	(setq funcs (cdr funcs))))))
+  (unless (fboundp 'file-regular-p)
+    (defun file-regular-p (file)
+      (and (not (file-directory-p file))
+	   (not (file-symlink-p file))
+	   (file-exists-p file))))
+  (unless (fboundp 'face-list)
+    (defun face-list (&rest args))))
+
+(eval-and-compile
+  (let ((case-fold-search t))
+    (cond
+     ((string-match "windows-nt\\|os/2\\|emx" (format "%s" system-type))
+      (setq nnheader-file-name-translation-alist
+	    (append nnheader-file-name-translation-alist
+		    '((?: . ?_)
+		      (?+ . ?-))))))))
+
+(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)
+
+(defun gnus-ems-redefine ()
+  (cond
+   ((string-match "XEmacs\\|Lucid" emacs-version)
+    (gnus-xmas-redefine))
+
+   ((featurep 'mule)
+    ;; Mule and new Emacs definitions
+
+    ;; [Note] Now there are three kinds of mule implementations,
+    ;; original MULE, XEmacs/mule and beta version of Emacs including
+    ;; some mule features. Unfortunately these API are different. In
+    ;; particular, Emacs (including original MULE) and XEmacs are
+    ;; quite different.
+    ;; 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 every mule variants are running.
+
+    ;; These implementations may be able to share between original
+    ;; MULE and beta version of new Emacs. In addition, it is able to
+    ;; detect XEmacs/mule by (featurep 'mule) and to check variable
+    ;; `emacs-version'. In this case, implementation for XEmacs/mule
+    ;; may be able to share between XEmacs and XEmacs/mule.
+
+    (defalias 'gnus-truncate-string 'truncate-string)
+
+    (defvar gnus-summary-display-table nil
+      "Display table used in summary mode buffers.")
+    (fset 'gnus-cite-add-face 'gnus-mule-cite-add-face)
+    (fset 'gnus-max-width-function 'gnus-mule-max-width-function)
+    (fset 'gnus-summary-set-display-table 'ignore)
+
+    (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 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))
+
+(provide 'gnus-ems)
+
+;; Local Variables:
+;; byte-compile-warnings: '(redefine callargs)
+;; End:
+
+;;; gnus-ems.el ends here