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[patch] 21.3 dired.el direx-aux.el dired-read-shell-command and default

From: Jari Aalto+mail.linux
Subject: [patch] 21.3 dired.el direx-aux.el dired-read-shell-command and default values
Date: Sat, 07 Feb 2004 16:30:15 +0200

In regard to this mail, here are patches for generally framework
of this kind. The command offered depends on file extension.

    From: Dan Jacobson <jidanni <AT> jidanni.org>
    Subject: make .pod trigger perldoc
    Newsgroups: gnu.emacs.bug
    To: bug-gnu-emacs <AT> gnu.org
    Date: 2004-02-04 06:07 ke EET
    Message-ID: <mailman.2008.1076101438.928.bug-gnu-emacs <AT> gnu.org>

    Make perldoc the default dired-do-shell-command when encountering
    .pod files.

2004-02-07 Sat  Jari Aalto  <jari.aalto <AT> poboxes.com>

        * dired.el (dired-shell-command-list): New user variable.

        * dired-aux.el (dired-read-shell-command-default-command): New.
        (dired-read-shell-command): Consult
        `dired-read-shell-command-default-command' and offer default if

Index: dired.el
RCS file: 
retrieving revision 1.1
retrieving revision 1.2
diff -u -IId: -u -b -w -r1.1 -r1.2
--- dired.el    26 Jun 2003 18:06:08 -0000      1.1
+++ dired.el    7 Feb 2004 10:45:50 -0000       1.2
@@ -169,6 +169,24 @@
   :type 'string
   :group 'dired)
+(defcustom dired-shell-command-list
+  (list
+   '("man$" "nroff -man")
+   '("pod$" "perldoc")
+   (cond
+    ((and (not (memq system-type '(windows-nt ms-dos)))
+                   (executable-find "xpdf"))
+     (list "pdf$" "xpdf"))))
+  "*In `dired-do-shell-command' if filename extension matches REGEXP, offer 
+The format is: '((FILE-EXTENSION-REGEXP COMMAND) (... ...) ...)
+Notice that the FILE-EXTENSION-REGEXP is matched against result of
+`file-name-extension' whose return value does not include dot character."
+  :type '(repeat
+          (list
+           (string :tag "file extension regexp")
+           (string :tag "command to run")))
+  :group 'dired)
 ;;; Hook variables
 (defvar dired-load-hook nil

Index: dired-aux.el
RCS file: 
retrieving revision 1.1
retrieving revision 1.2
diff -u -IId: -u -b -w -r1.1 -r1.2
--- dired-aux.el        26 Jun 2003 18:06:08 -0000      1.1
+++ dired-aux.el        7 Feb 2004 14:05:08 -0000       1.2
@@ -296,6 +296,22 @@
 ;;; Shell commands
+(defun dired-read-shell-command-default-command (files)
+  "From FILES, guess default command for `dired-read-shell-command'.
+Return nil or command."
+  (let (ext-list)
+    (dolist (file files)
+      (pushnew (file-name-extension (file-name-nondirectory file))
+               ext-list))
+    (when (eq 1 (length ext-list))
+      ;;  All have the same extension
+      (dolist (elt dired-shell-command-list)
+        (multiple-value-bind (regexp command) elt
+          (when (and (stringp regexp)
+                     (stringp command)
+                     (string-match regexp (car ext-list)))
+            (return command)))))))
 (defun dired-read-shell-command (prompt arg files)
 ;;  "Read a dired shell command prompting with PROMPT (using read-string).
 ;;ARG is the prefix arg and may be used to indicate in the prompt which
@@ -305,7 +321,8 @@
    nil 'shell files
    (function read-string)
    (format prompt (dired-mark-prompt arg files))
-   nil 'shell-command-history))
+   (dired-read-shell-command-default-command files)
+   'shell-command-history))
 ;; The in-background argument is only needed in Emacs 18 where
 ;; shell-command doesn't understand an appended ampersand `&'.
@@ -334,7 +351,8 @@
 output files usually are created there instead of in a subdir.
 In a noninteractive call (from Lisp code), you must specify
-the list of file names explicitly with the FILE-LIST argument."
+the list of file names explicitly with the FILE-LIST argument.
+See also variable `dired-shell-command-list'."
 ;;Functions dired-run-shell-command and dired-shell-stuff-it do the
 ;;actual work and can be redefined for customization.

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