X-Git-Url: http://cgit.sxemacs.org/?p=gnus;a=blobdiff_plain;f=lisp%2Fgnus-compat.el;h=1d8a2b3fbf53e9cc37018b063676389d208c18a6;hp=2cca394dedd0ab21fbd54be802a7b97a3103ab54;hb=2c5b608b32bc1236a906eb71517d161b48ff4747;hpb=c387d52af8371b1d4defdf23cc409ab6b21fb4eb

diff --git a/lisp/gnus-compat.el b/lisp/gnus-compat.el
index 2cca394de..1d8a2b3fb 100644
--- a/lisp/gnus-compat.el
+++ b/lisp/gnus-compat.el
@@ -1,6 +1,6 @@
 ;;; gnus-compat.el --- Compatability functions for Gnus
 
-;; Copyright (C) 2012 Free Software Foundation, Inc.
+;; Copyright (C) 2012-2015 Free Software Foundation, Inc.
 
 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
 ;; Keywords: compat
@@ -33,6 +33,7 @@
 (ignore-errors
   (require 'help-fns))
 
+;; XEmacs doesn't have this function.
 (when (and (not (fboundp 'help-function-arglist))
 	   (fboundp 'function-arglist))
   (defun help-function-arglist (def &optional preserve-names)
@@ -40,6 +41,24 @@
 PRESERVE-NAMES is ignored."
     (cdr (car (read-from-string (downcase (function-arglist def)))))))
 
+;; Modify this function on Emacs 23.1 and earlier to always return the
+;; right answer.
+(when (and (fboundp 'help-function-arglist)
+	   (eq (help-function-arglist 'car) t))
+  (defvar gnus-compat-original-help-function-arglist
+    (symbol-function 'help-function-arglist))
+  (defun help-function-arglist (def &optional preserve-names)
+    "Return a formal argument list for the function DEF.
+PRESERVE-NAMES is ignored."
+    (let ((orig (funcall gnus-compat-original-help-function-arglist def)))
+      (if (not (eq orig t))
+	  orig
+	;; Built-in subrs have the arglist hidden in the doc string.
+	(let ((doc (documentation def)))
+	  (when (and doc
+		     (string-match "\n\n\\((fn\\( .*\\)?)\\)\\'" doc))
+	    (cdr (car (read-from-string (downcase (match-string 1 doc)))))))))))
+
 (when (= (length (help-function-arglist 'delete-directory)) 1)
   (defvar gnus-compat-original-delete-directory
     (symbol-function 'delete-directory))
@@ -57,6 +76,83 @@ TRASH is ignored."
 	    (delete-file file))))
       (delete-directory directory))))
 
+;; Emacs 24.0.93
+(require 'url)
+(when (= (length (help-function-arglist 'url-retrieve)) 5)
+  (defvar gnus-compat-original-url-retrieve
+    (symbol-function 'url-retrieve))
+  (defun url-retrieve (url callback &optional cbargs silent inhibit-cookies)
+    "Retrieve URL asynchronously and call CALLBACK with CBARGS when finished."
+    (funcall gnus-compat-original-url-retrieve
+	     url callback cbargs silent)))
+
+;; XEmacs
+(when (and (not (fboundp 'timer-set-function))
+	   (fboundp 'set-itimer-function))
+  (defun timer-set-function (timer function &optional args)
+    "Make TIMER call FUNCTION with optional ARGS when triggering."
+    (lexical-let ((function function)
+		  (args args))
+      (set-itimer-function timer
+			   (lambda (process status)
+			     (apply function process status args))))))
+
+;; XEmacs 21.4
+(unless (fboundp 'bound-and-true-p)
+  (defmacro bound-and-true-p (var)
+    "Return the value of symbol VAR if it is bound, else nil."
+    (and (boundp var)
+	 (symbol-value var))))
+
+
+;; Emacs less than 24.3
+(unless (fboundp 'add-face)
+  (defun add-face (beg end face)
+    "Combine FACE BEG and END."
+    (let ((b beg))
+      (while (< b end)
+	(let ((oldval (get-text-property b 'face)))
+	  (put-text-property
+	   b (setq b (next-single-property-change b 'face nil end))
+	   'face (cond ((null oldval)
+			face)
+		       ((and (consp oldval)
+			     (not (keywordp (car oldval))))
+			(cons face oldval))
+		       (t
+			(list face oldval)))))))))
+
+(unless (fboundp 'move-beginning-of-line)
+  (defun move-beginning-of-line (arg)
+    (interactive "p")
+    (unless (= arg 1)
+      (forward-line arg))
+    (beginning-of-line)))
+
+(unless (fboundp 'delete-dups)
+  (defun delete-dups (list)
+    "Destructively remove `equal' duplicates from LIST.
+Store the result in LIST and return it.  LIST must be a proper list.
+Of several `equal' occurrences of an element in LIST, the first
+one is kept."
+    (let ((tail list))
+      (while tail
+	(setcdr tail (delete (car tail) (cdr tail)))
+	(setq tail (cdr tail))))
+    list))
+
+(unless (fboundp 'declare-function)
+  (defmacro declare-function (&rest r)))
+
+(unless (fboundp 'string-bytes)
+  (defun string-bytes (string)
+    (length (if (or (mm-coding-system-p 'utf-8)
+		    (ignore-errors
+		      (let (mucs-ignore-version-incompatibilities)
+			(require 'un-define))))
+		(mm-encode-coding-string string 'utf-8)
+	      string))))
+
 (provide 'gnus-compat)
 
 ;; gnus-compat.el ends here