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dired-open.el
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dired-open.el
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;;; dired-open.el --- Open files from dired using using custom actions
;; Copyright (C) 2014-2015 Matúš Goljer
;; Author: Matúš Goljer <matus.goljer@gmail.com>
;; Maintainer: Matúš Goljer <matus.goljer@gmail.com>
;; Keywords: files
;; Version: 0.0.1
;; Created: 14th February 2014
;; Package-Requires: ((dash "2.5.0") (dired-hacks-utils "0.0.1") (emacs "24"))
;; URL: https://github.com/Fuco1/dired-hacks
;; This program 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 3 of the License, or
;; (at your option) any later version.
;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; While Emacs already has the `auto-mode-alist', this is often
;; insufficient. Many times, you want to open media files, pdfs or
;; other documents with an external application. There's remedy for
;; that too, namely `dired-guess-shell-alist-user', but that is still
;; not as convenient as just hitting enter.
;; This package adds a mechanism to add "hooks" to `dired-find-file'
;; that will run before Emacs tries its own mechanisms to open the
;; file, thus enabling you to launch other application or code and
;; suspend the default behaviour.
;; By default, two additional methods are enabled,
;; `dired-open-by-extension' and `dired-open-subdir'.
;; This package also provides other convenient hooks:
;;
;; * `dired-open-xdg' - try to open the file using `xdg-open'
;; * `dired-open-guess-shell-alist' - try to open the file by
;; launching applications from `dired-guess-shell-alist-user'
;; * `dired-open-call-function-by-extension' - call an elisp function
;; based on extension.
;;
;; These are not used by default.
;; You can customize the list of functions to try by customizing
;; `dired-open-functions'.
;; To fall back to the default `dired-find-file', you can provide the
;; prefix argument (usually C-u) to the `dired-open-file' function.
;; This is useful for example when you configure html files to be
;; opened in browser and you want to edit the file instead of view it.
;; Note also that this package can handle calls when point is not on a
;; line representing a file---an example hook is provided to open a
;; subdirectory under point if point is on the subdir line, see
;; `dired-open-subdir'.
;; If you write your own handler, make sure they do *not* throw errors
;; but instead return nil if they can't proceed.
;; See https://github.com/Fuco1/dired-hacks for the entire collection.
;;; Code:
(require 'dired-x)
(require 'dired-hacks-utils)
(require 'dash)
(defgroup dired-open ()
"Open files from dired using using custom actions."
:group 'dired-hacks
:prefix "dired-open-")
(defcustom dired-open-functions '(dired-open-by-extension dired-open-subdir)
"List of functions to try to open a file.
Each function should accept no arguments and should retrieve the
filename and/or other context by itself. Each function should
return non-nil value if it succeeded in opening the file."
:type 'hook
:group 'dired-open)
(defcustom dired-open-find-file-function #'dired-find-file
"A function that will be used if none of the `dired-open-functions' succeeded."
:type 'function
:group 'dired-open)
(defcustom dired-open-extensions nil
"Alist of extensions mapping to a programs to run them in.
The filename is appended after the program."
:type '(alist
:key-type (string :tag "Extension")
:value-type (string :tag "Program"))
:group 'dired-open)
(defcustom dired-open-extensions-elisp nil
"Alist of extensions mapping to an elisp function to be called.
The filename is passed as the only argument to the function."
:type '(alist
:key-type (string :tag "Extension")
:value-type (function :tag "Function"))
:group 'dired-open)
(defcustom dired-open-use-nohup t
"If non-nil, use nohup to keep external processes alive.
See man page `nohup(1)'.
This only affects the built-in handlers."
:type 'boolean
:group 'dired-open)
(defcustom dired-open-query-before-exit t
"If non-nil, ask the user if they want to kill any external
processes started by `dired-open-file' when they exit Emacs.
This only affects the built-in handlers."
:type 'boolean
:group 'dired-open)
(defun dired-open--start-process (file command)
"Open FILE with COMMAND.
FILE is string, path to the file you want to open. It is
resolved with `file-truename'.
Note that FILE should not be \"shell escaped\", that is handled
by this function if the shell is invoked.
COMMAND is a string representing the command to run. If you want
to call it with any switches, these should be included in this
string as well."
(let ((process
(apply 'start-process "dired-open" nil
(if dired-open-use-nohup
(list "sh" "-c"
(concat
"nohup "
command
" "
(shell-quote-argument (file-truename file))
" 2>&1 >/dev/null"))
(append (split-string command " ")
(list (file-truename file)))))))
(when (and process
(not dired-open-query-before-exit))
(set-process-query-on-exit-flag process nil))
process))
;;; file opening procedures
(defun dired-open-xdg ()
"Try to run `xdg-open' to open the file under point."
(interactive)
(if (executable-find "xdg-open")
(let ((file (ignore-errors (dired-get-file-for-visit))))
(call-process-shell-command (concat "xdg-open '" (file-truename file) "'"))
nil)))
(defun dired-open-by-extension ()
"Open a file according to its extension.
The mappings from extensions to applications is specified by
`dired-open-extensions'."
(interactive)
(let ((file (ignore-errors (dired-get-file-for-visit)))
process)
(when (and file
(not (file-directory-p file)))
(--each-while dired-open-extensions (not process)
(when (string-match-p (concat "\\." (regexp-quote (car it)) "\\'") file)
(setq process (dired-open--start-process file (cdr it)))))
process)))
(defun dired-open-guess-shell-alist ()
"Open the file under point in an application suggested by
`dired-guess-shell-alist-user'."
(interactive)
(let ((file (ignore-errors (dired-get-file-for-visit)))
process)
(when (and file
(not (file-directory-p file)))
(--each-while dired-guess-shell-alist-user (not process)
(when (string-match-p (car it) file)
(setq process (dired-open--start-process file (eval (cadr it)))))))
process))
(defun dired-open-call-function-by-extension ()
"Call an elisp function on file according to its extension.
The mappings from extensions to applications is specified by
`dired-open-extensions-elisp'."
(interactive)
(-when-let (file (dired-utils-get-filename))
(when (not (file-directory-p file))
(--when-let (dired-utils-match-filename-extension file dired-open-extensions-elisp)
(funcall (cdr it) file)
it))))
;;; non-file opening procedures
(defun dired-open-subdir ()
"If point is on a subdir line, open the directory under point
in a new buffer.
For example, if the point is on line
/home/us|er/downloads
the directory /home/user is opened in new buffer."
(interactive)
(-when-let (subdir (dired-get-subdir))
(if (or (bolp) (eolp))
(find-file subdir)
(-when-let (end (save-excursion (re-search-forward "[/:]" (line-end-position) t)))
(let ((path (buffer-substring-no-properties
(+ 2 (line-beginning-position))
(1- end))))
(find-file path))))))
;;; main
;;;###autoload
(defun dired-open-file (&optional arg)
"Try `dired-open-functions' to open the thing under point.
That can be either file or any other line of dired listing.
If no function succeeded, run `dired-find-file' normally.
With \\[universal-argument], run `dired-find-file' normally."
(interactive "P")
(when (or arg
(not (run-hook-with-args-until-success 'dired-open-functions)))
(funcall dired-open-find-file-function)))
(define-key dired-mode-map [remap dired-find-file] 'dired-open-file)
(provide 'dired-open)
;;; dired-open.el ends here