;;; openwith.el --- Open files with external programs
;; Copyright (C) 2007 Markus Triska
;; Author: Markus Triska <firstname.lastname@example.org>
;; Keywords: files, processes
;; This file 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.
;; This file 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., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;; This lets you associate external applications with files so that
;; you can open them via C-x C-f, with RET in dired, etc.
;; Copy openwith.el to your load-path and add to your .emacs:
;; (require 'openwith)
;; (openwith-mode t)
;; To customize associations etc., use:
;; M-x customize-group RET openwith RET
(defconst openwith-version "0.8f")
(defgroup openwith nil
"Associate external applications with file name patterns."
'(("\\.pdf\\'" "acroread" (file))
("\\.mp3\\'" "xmms" (file))
("\\.\\(?:mpe?g\\|avi\\|wmv\\)\\'" "mplayer" ("-idx" file))
("\\.\\(?:jp?g\\|png\\)\\'" "display" (file)))
"Associations of file patterns to external programs.
File pattern is a regular expression describing the files to
associate with a program. The program arguments are a list of
strings and symbols and are passed to the program on invocation,
where the symbol 'file' is replaced by the file to be opened."
:type '(repeat (list (regexp :tag "Files")
(string :tag "Program")
(sexp :tag "Parameters"))))
(defcustom openwith-confirm-invocation nil
"Ask for confirmation before invoking external programs."
(defun openwith-make-extension-regexp (strings)
"Make a regexp that matches a string that starts with a '.',
has any of the supplied STRINGS, and is at the end of the
(concat "\\." (regexp-opt extension-strings) "$"))
(defun openwith-open (command arglist)
"Run external command COMMAND, in such a way that it is
disowned from the parent Emacs process. If Emacs dies, the
process spawned here lives on. ARGLIST is a list of strings,
each an argument to COMMAND."
(let ((shell-file-name "/bin/sh"))
(mapcar 'shell-quote-argument arglist)
(defun openwith-file-handler (operation &rest args)
"Open file with external program, if an association is configured."
(when (and openwith-mode (not (buffer-modified-p)) (zerop (buffer-size)))
(let ((assocs openwith-associations)
(file (car args))
;; do not use `dolist' here, since some packages (like cl)
;; temporarily unbind it
(setq oa (car assocs)
assocs (cdr assocs))
(when (save-match-data (string-match (car oa) file))
(let ((params (mapcar (lambda (x) (if (eq x 'file) file x))
(nth 2 oa))))
(when (or (not openwith-confirm-invocation)
(y-or-n-p (format "%s %s? " (cadr oa)
(mapconcat #'identity params " "))))
(openwith-open (cadr oa) params)
(when (featurep 'recentf)
;; inhibit further actions
(error "Opened %s in external program"
;; when no association was found, relay the operation to other handlers
(and (eq inhibit-file-name-operation operation)
(apply operation args)))
"Automatically open files with external programs."
;; register `openwith-file-handler' for all files
(put 'openwith-file-handler 'safe-magic t)
(put 'openwith-file-handler 'operations '(insert-file-contents))
(add-to-list 'file-name-handler-alist '("" . openwith-file-handler)))
(delete '("" . openwith-file-handler) file-name-handler-alist))))
;;; openwith.el ends here