Merge from gnulib
[emacs.git] / lisp / t-mouse.el
blob2ed2fcb466e7e637287177350beeee6a5cf6164a
1 ;;; t-mouse.el --- mouse support within the text terminal
3 ;; Author: Nick Roberts <nickrob@gnu.org>
4 ;; Maintainer: emacs-devel@gnu.org
5 ;; Keywords: mouse gpm linux
7 ;; Copyright (C) 1994-1995, 1998, 2006-2017 Free Software Foundation,
8 ;; Inc.
10 ;; This file is part of GNU Emacs.
12 ;; GNU Emacs is free software: you can redistribute it and/or modify
13 ;; it under the terms of the GNU General Public License as published by
14 ;; the Free Software Foundation, either version 3 of the License, or
15 ;; (at your option) any later version.
17 ;; GNU Emacs is distributed in the hope that it will be useful,
18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 ;; GNU General Public License for more details.
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
25 ;;; Commentary:
27 ;; This package provides access to mouse event as reported by the gpm-Linux
28 ;; package. It tries to reproduce the functionality offered by Emacs under X.
29 ;; The "gpm" server runs under Linux, so this package is rather
30 ;; Linux-dependent.
32 ;; The file, t-mouse.el was originally written by Alessandro Rubini and Ian T
33 ;; Zimmerman, and Emacs communicated with gpm through a client program called
34 ;; mev. Now the interface with gpm is directly through a Unix socket, so this
35 ;; file is reduced to a single minor mode macro call.
39 ;;; Code:
41 ;; Prevent warning when compiling in an Emacs without gpm support.
42 (declare-function gpm-mouse-start "term.c" ())
44 (defun gpm-mouse-enable ()
45 "Try to enable gpm mouse support on the current terminal."
46 (let ((activated nil))
47 (unwind-protect
48 (progn
49 (unless (fboundp 'gpm-mouse-start)
50 (error "Emacs must be built with Gpm to use this mode"))
51 (when gpm-mouse-mode
52 (gpm-mouse-start)
53 (set-terminal-parameter nil 'gpm-mouse-active t)
54 (setq activated t)))
55 ;; If something failed to turn it on, try to turn it off as well,
56 ;; just in case.
57 (unless activated (gpm-mouse-disable)))))
59 (defun gpm-mouse-disable ()
60 "Try to disable gpm mouse support on the current terminal."
61 (when (fboundp 'gpm-mouse-stop)
62 (gpm-mouse-stop))
63 (set-terminal-parameter nil 'gpm-mouse-active nil))
65 ;;;###autoload
66 (define-obsolete-function-alias 't-mouse-mode 'gpm-mouse-mode "23.1")
67 ;;;###autoload
68 (define-minor-mode gpm-mouse-mode
69 "Toggle mouse support in GNU/Linux consoles (GPM Mouse mode).
70 With a prefix argument ARG, enable GPM Mouse mode if ARG is
71 positive, and disable it otherwise. If called from Lisp, enable
72 the mode if ARG is omitted or nil.
74 This allows the use of the mouse when operating on a GNU/Linux console,
75 in the same way as you can use the mouse under X11.
76 It relies on the `gpm' daemon being activated.
78 Note that when `gpm-mouse-mode' is enabled, you cannot use the
79 mouse to transfer text between Emacs and other programs which use
80 GPM. This is due to limitations in GPM and the Linux kernel."
81 :global t :group 'mouse :init-value t
82 (dolist (terminal (terminal-list))
83 (when (and (eq t (terminal-live-p terminal))
84 (not (eq gpm-mouse-mode
85 (terminal-parameter terminal 'gpm-mouse-active))))
86 ;; Simulate selecting a terminal by selecting one of its frames ;-(
87 (with-selected-frame (car (frames-on-display-list terminal))
88 (if gpm-mouse-mode (gpm-mouse-enable) (gpm-mouse-disable))))))
90 (provide 't-mouse)
92 ;;; t-mouse.el ends here