Call imagemagick-register-types automatically.

* lisp/image.el (imagemagick--extension-regexp): New variable.
(imagemagick-register-types): Use it.
(imagemagick-types-inhibit): Add :set function.  Allow new value
of t to inhibit all types.

* lisp/loadup.el (fboundp): Preload regexp-opt, needed by
imagemagick-register-types.

* lisp/emacs-lisp/regexp-opt.el (regexp-opt-charset): Avoid cl macros,
so we can preload it.

5 files changed, 80 insertions, 39 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 56a0c9bf95d..03ec5405803 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -35,6 +35,14 @@ been adding them there, put them somewhere else, eg site-lisp.
 ** If your Emacs was built from a bzr checkout, the new variable
 `emacs-bzr-version' contains information about which bzr revision was used.
 
+** ImageMagick support, if available, is automatically enabled.
+It is no longer necessary to call `imagemagick-register-types'
+explicitly to install ImageMagick image types; that function is called
+automatically when setting `imagemagick-types-inhibit'.
+
+*** Setting `imagemagick-types-inhibit' to t now disables the use of
+ImageMagick to view images, set
+
 
 * Editing Changes in Emacs 24.2
 
diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index a21d5841346..f50af02a239 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,16 @@
+2012-04-16  Chong Yidong  <cyd@gnu.org>
+
+        * image.el (imagemagick--extension-regexp): New variable.
+        (imagemagick-register-types): Use it.
+        (imagemagick-types-inhibit): Add :set function.  Allow new value
+        of t to inhibit all types.
+
+        * emacs-lisp/regexp-opt.el (regexp-opt-charset): Avoid cl macros,
+        so we can preload it.
+
+        * loadup.el (fboundp): Preload regexp-opt, needed by
+        imagemagick-register-types.
+
 2012-04-15  Chong Yidong  <cyd@gnu.org>
 
         * frame.el (scrolling): Remove nearly unused customization group.
diff --git a/lisp/emacs-lisp/regexp-opt.el b/lisp/emacs-lisp/regexp-opt.el
index 6d12fe19277..72e3c398dc0 100644
--- a/lisp/emacs-lisp/regexp-opt.el
+++ b/lisp/emacs-lisp/regexp-opt.el
@@ -136,9 +136,6 @@ This means the number of non-shy regexp grouping constructs
 
 ;;; Workhorse functions.
 
-(eval-when-compile
-  (require 'cl))
-
 (defun regexp-opt-group (strings &optional paren lax)
   "Return a regexp to match a string in the sorted list STRINGS.
 If PAREN non-nil, output regexp parentheses around returned regexp.
@@ -248,15 +245,15 @@ Merges keywords to avoid backtracking in Emacs's regexp matcher."
     ;;
     ;; Make a character map but extract character set meta characters.
     (dolist (char chars)
-      (case char
-        (?\]
-         (setq bracket "]"))
-        (?^
-         (setq caret "^"))
-        (?-
-         (setq dash "-"))
-        (otherwise
-         (aset charmap char t))))
+      (cond
+       ((eq char ?\])
+        (setq bracket "]"))
+       ((eq char ?^)
+        (setq caret "^"))
+       ((eq char ?-)
+        (setq dash "-"))
+       (t
+        (aset charmap char t))))
     ;;
     ;; Make a character set from the map using ranges where applicable.
     (map-char-table
@@ -268,14 +265,14 @@ Merges keywords to avoid backtracking in Emacs's regexp matcher."
                    (setq charset (format "%s%c-%c" charset start end))
                  (while (>= end start)
                    (setq charset (format "%s%c" charset start))
-                   (incf start)))
+                   (setq start (1+ start))))
                (setq start (car c) end (cdr c)))
            (if (= (1- c) end) (setq end c)
              (if (> end (+ start 2))
                (setq charset (format "%s%c-%c" charset start end))
              (while (>= end start)
                (setq charset (format "%s%c" charset start))
-               (incf start)))
+               (setq start (1+ start))))
              (setq start c end c)))))
      charmap)
     (when (>= end start)
@@ -283,7 +280,7 @@ Merges keywords to avoid backtracking in Emacs's regexp matcher."
           (setq charset (format "%s%c-%c" charset start end))
         (while (>= end start)
           (setq charset (format "%s%c" charset start))
-          (incf start))))
+          (setq start (1+ start)))))
     ;;
     ;; Make sure a caret is not first and a dash is first or last.
     (if (and (string-equal charset "") (string-equal bracket ""))
diff --git a/lisp/image.el b/lisp/image.el
index b094f2464ec..348c208781e 100644
--- a/lisp/image.el
+++ b/lisp/image.el
@@ -685,26 +685,16 @@ The minimum delay between successive frames is 0.01s."
                       image n count time-elapsed limit))))
 
 
-(defcustom imagemagick-types-inhibit
-  '(C HTML HTM TXT PDF)
-  "ImageMagick types that should not be visited in Image mode.
-This should be a list of symbols, each of which should be one of
-the ImageMagick types listed in `imagemagick-types'.  These image
-types are not registered by `imagemagick-register-types'.
-
-If Emacs is compiled without ImageMagick support, this variable
-has no effect."
-  :type '(choice (const :tag "Let ImageMagick handle all types it can" nil)
-                 (repeat symbol))
-  ;; Ideally, would have a :set function that checks if we already did
-  ;; imagemagick-register-types, and if so undoes it, then redoes it.
-  :version "24.1"
-  :group 'image)
+(defvar imagemagick--file-regexp nil
+  "File extension regexp for ImageMagick files, if any.
+This is the extension installed into `auto-mode-alist' and
+`image-type-file-name-regexps' by `imagemagick-register-types'.")
 
 ;;;###autoload
 (defun imagemagick-register-types ()
   "Register file types that can be handled by ImageMagick.
-This registers the ImageMagick types listed in `imagemagick-types',
+This function is called at startup, after loading the init file.
+It registers the ImageMagick types listed in `imagemagick-types',
 excluding those listed in `imagemagick-types-inhibit'.
 
 Registered image types are added to `auto-mode-alist', so that
@@ -714,14 +704,45 @@ recognizes these files as having image type `imagemagick'.
 
 If Emacs is compiled without ImageMagick support, do nothing."
   (when (fboundp 'imagemagick-types)
-    (let ((im-types '()))
-      (dolist (im-type (imagemagick-types))
-        (unless (memq im-type imagemagick-types-inhibit)
-          (push (downcase (symbol-name im-type)) im-types)))
-      (let ((extension (concat "\\." (regexp-opt im-types) "\\'")))
-        (push (cons extension 'image-mode) auto-mode-alist)
-        (push (cons extension 'imagemagick)
-              image-type-file-name-regexps)))))
+    (let ((re (if (eq imagemagick-types-inhibit t)
+                  ;; Use a bogus regexp to inhibit matches.
+                  "\\'a"
+                (let ((types))
+                  (dolist (type (imagemagick-types))
+                    (unless (memq type imagemagick-types-inhibit)
+                      (push (downcase (symbol-name type)) types)))
+                  (concat "\\." (regexp-opt types) "\\'"))))
+          (ama-elt (car (member (cons imagemagick--file-regexp 'image-mode)
+                                auto-mode-alist)))
+          (itfnr-elt (car (member (cons imagemagick--file-regexp 'imagemagick)
+                                  image-type-file-name-regexps))))
+      (if ama-elt
+          (setcar ama-elt re)
+        (push (cons re 'image-mode) auto-mode-alist))
+      (if itfnr-elt
+          (setcar itfnr-elt re)
+        (push (cons re 'imagemagick) image-type-file-name-regexps))
+      (setq imagemagick--file-regexp re))))
+
+(defcustom imagemagick-types-inhibit
+  '(C HTML HTM TXT PDF)
+  "List of ImageMagick types that should not be treated as images.
+This should be a list of symbols, each of which should be one of
+the ImageMagick types listed in `imagemagick-types'.  The listed
+image types are not registered by `imagemagick-register-types'.
+
+If the value is t, inhibit the use of ImageMagick for images.
+
+If Emacs is compiled without ImageMagick support, this variable
+has no effect."
+  :type '(choice (const :tag "Support all ImageMagick types" nil)
+                 (const :tag "Disable all ImageMagick types" t)
+                 (repeat symbol))
+  :set (lambda (symbol value)
+         (set-default symbol value)
+         (imagemagick-register-types))
+  :version "24.1"
+  :group 'image)
 
 (provide 'image)
 
diff --git a/lisp/loadup.el b/lisp/loadup.el
index 2ba24c8fe37..f7ffa27a9ed 100644
--- a/lisp/loadup.el
+++ b/lisp/loadup.el
@@ -193,6 +193,8 @@
 (if (fboundp 'x-create-frame)
     (progn
       (load "fringe")
+      ;; Needed by `imagemagick-register-types'
+      (load "emacs-lisp/regexp-opt")
       (load "image")
       (load "international/fontset")
       (load "dnd")