Commit 20d385d6 authored by Nick Roberts's avatar Nick Roberts
Browse files

Reduce to a minor-mode macro call.

parent a7c03edb
;;; t-mouse.el --- mouse support within the text terminal
;; Authors: Alessandro Rubini and Ian T Zimmerman
;; Maintainer: Nick Roberts <>
;; Author: Nick Roberts <>
;; Maintainer: FSF
;; Keywords: mouse gpm linux
;; Copyright (C) 1994, 1995, 1998, 2006, 2007 Free Software Foundation, Inc.
......@@ -25,249 +25,20 @@
;;; Commentary:
;; This package provides access to mouse event as reported by the
;; gpm-Linux package. It uses the program "mev" to get mouse events.
;; It tries to reproduce the functionality offered by Emacs under X.
;; This package provides access to mouse event as reported by the gpm-Linux
;; package. It tries to reproduce the functionality offered by Emacs under X.
;; The "gpm" server runs under Linux, so this package is rather
;; Linux-dependent.
;; Modified by Nick Roberts for Emacs 22. In particular, the mode-line is
;; now position sensitive.
(defvar t-mouse-process nil
"Embeds the process which passes mouse events to Emacs.
It is used by the program t-mouse.")
(defvar t-mouse-filter-accumulator ""
"Accumulates input from the mouse reporting process.")
(defvar t-mouse-debug-buffer nil
"Events normally posted to command queue are printed here in debug mode.
See `t-mouse-start-debug'.")
(defvar t-mouse-current-xy '(0 . 0)
"Stores the last mouse position t-mouse has been told about.")
(defvar t-mouse-drag-start nil
"Whenever a drag starts in a special part of a window
\(not the text), the `translated' starting coordinates including the
window and part involved are saved here. This is necessary lest they
get re-translated when the button goes up, at which time window
configuration may have changed.")
(defvar t-mouse-prev-set-selection-function 'x-set-selection)
(defvar t-mouse-prev-get-selection-function 'x-get-selection)
(defvar t-mouse-swap-alt-keys nil
"When set, Emacs will handle mouse events with the right Alt
\(a.k.a. Alt-Ger) modifier, not with the regular left Alt modifier.
Useful for people who play strange games with their keyboard tables.")
(defvar t-mouse-fix-21 nil
"Enable brain-dead chords for 2 button mice.")
;; The file, t-mouse was originally written by Alessandro Rubini and Ian T
;; Zimmerman and communicated with Emacs through the client program mev. Now
;; the interface with gpm is directly through a Unix socket, so this file is
;; reduced to a minor mode macro call.
;;; Code:
;; get the number of the current virtual console
(defun t-mouse-tty ()
"Return number of virtual terminal Emacs is running on, as a string.
For example, \"2\" for /dev/tty2."
(call-process "ps" nil t nil "h" (format "%s" (emacs-pid)))
(goto-char (point-min))
(if (or
;; Many versions of "ps", all different....
(re-search-forward " +tty\\(.?[0-9a-f]\\)" nil t)
(re-search-forward "p \\([0-9a-f]\\)" nil t)
(re-search-forward "v0\\([0-9a-f]\\)" nil t)
(re-search-forward "[0-9]+ +\\([0-9]+\\)" nil t)
(re-search-forward "[\\t ]*[0-9]+[\\t ]+\\([0-9]+\\)" nil t)
(re-search-forward " +vc/\\(.?[0-9a-f]\\)" nil t)
(re-search-forward " +pts/\\(.?[0-9a-f]\\)" nil t))
(buffer-substring (match-beginning 1) (match-end 1)))))
;; due to a horrible kludge in Emacs' keymap handler
;; (read_key_sequence) mouse clicks on funny parts of windows generate
;; TWO events, the first being a dummy of the sort '(mode-line).
;; That's why Per Abrahamsen's code in xt-mouse.el doesn't work for
;; the modeline, for instance.
;; now get this: the Emacs C code that generates these fake events
;; depends on certain things done by the very lowest level input
;; handlers; namely the symbols for the events (for instance
;; 'C-S-double-mouse-2) must have an 'event-kind property, set to
;; 'mouse-click. Since events from unread-command-events do not pass
;; through the low level handlers, they don't get this property unless
;; I set it myself. I imagine this has caused innumerable attempts by
;; hackers to do things similar to t-mouse to lose.
;; The next page of code is devoted to fixing this ugly problem.
;; WOW! a fully general powerset generator
;; (C) Ian Zimmerman Mon Mar 23 12:00:16 PST 1998 :-)
(defun t-mouse-powerset (l)
(if (null l) '(nil)
(let ((l1 (t-mouse-powerset (cdr l)))
(first (nth 0 l)))
(mapcar (function (lambda (l) (cons first l))) l1) l1))))
;; and a slightly less general cartesian product
(defun t-mouse-cartesian (l1 l2)
(if (null l1) l2
(append (mapcar (function (lambda (x) (append (nth 0 l1) x))) l2)
(t-mouse-cartesian (cdr l1) l2))))
(let* ((modifier-sets (t-mouse-powerset '(control meta shift)))
(typed-sets (t-mouse-cartesian '((down) (drag))
'((mouse-1) (mouse-2) (mouse-3))))
(multipled-sets (t-mouse-cartesian '((double) (triple)) typed-sets))
(all-sets (t-mouse-cartesian modifier-sets multipled-sets)))
(while all-sets
(let ((event-sym (event-convert-list (nth 0 all-sets))))
(if (not (get event-sym 'event-kind))
(put event-sym 'event-kind 'mouse-click)))
(setq all-sets (cdr all-sets))))
(defun t-mouse-make-event-element (x-dot-y-avec-time)
(let* ((x-dot-y (nth 0 x-dot-y-avec-time))
(time (nth 1 x-dot-y-avec-time))
(x (car x-dot-y))
(y (cdr x-dot-y))
(w (window-at x y))
(ltrb (window-edges w))
(left (nth 0 ltrb))
(top (nth 1 ltrb))
(event (if w
(posn-at-x-y (- x left) (- y top) w t)
(append (list nil 'menu-bar)
(nthcdr 2 (posn-at-x-y x y))))))
(setcar (nthcdr 3 event) time)
;;; This fun is partly Copyright (C) 1994 Per Abrahamsen <>
(defun t-mouse-make-event ()
"Make a Lisp style event from the contents of mouse input accumulator.
Also trim the accumulator by all the data used to build the event."
(let (ob (ob-pos (condition-case nil
;; this test is just needed for Fedora Core 3
(if (string-match "STILL RUNNING_1\n"
(setq t-mouse-filter-accumulator
t-mouse-filter-accumulator (match-end 0))))
(read-from-string t-mouse-filter-accumulator))
(error nil))))
;; this test is just needed for Fedora Core 3
(if (or (eq (car ob-pos) 'STILL) (eq (car ob-pos) '***) (not ob-pos))
(setq ob (car ob-pos))
(if (string-match "mev:$" (prin1-to-string ob))
(error "Can't open mouse connection"))
(setq t-mouse-filter-accumulator
(substring t-mouse-filter-accumulator (cdr ob-pos)))
;;now the real work
(let ((event-type (nth 0 ob))
(current-xy-avec-time (nth 1 ob))
(type-switch (length ob)))
(if t-mouse-fix-21
;;Acquire the event's symbol's name.
((event-name-string (symbol-name event-type))
(if (string-match "-\\(21\\|\\12\\)$" event-name-string)
;;Transform the name to what it should have been.
(setq end-of-root-event-name (match-beginning 0))
(setq new-event-name-string
(concat (substring
event-name-string 0
end-of-root-event-name) "-3"))
;;Change the event to the symbol that corresponds to the
;;name we made. The proper symbol already exists.
(setq event-type
(intern new-event-name-string))))))
;;store current position for mouse-position
(setq t-mouse-current-xy (nth 0 current-xy-avec-time))
;;events have many types but fortunately they differ in length
((= type-switch 4) ;must be drag
(let ((count (nth 2 ob))
(or t-mouse-drag-start
(t-mouse-make-event-element (nth 3 ob))))
(t-mouse-make-event-element current-xy-avec-time)))
(setq t-mouse-drag-start nil)
(list event-type start-element end-element count)))
((= type-switch 3) ;down or up
(let ((count (nth 2 ob))
(t-mouse-make-event-element current-xy-avec-time)))
(if (and (not t-mouse-drag-start)
(symbolp (nth 1 element)))
;; OUCH! GOTCHA! emacs uses setc[ad]r on these!
(setq t-mouse-drag-start (copy-sequence element))
(setq t-mouse-drag-start nil))
(list event-type element count)))
((= type-switch 2) ;movement
(list (if (eq 'vertical-scroll-bar
(nth 1 t-mouse-drag-start)) 'scroll-bar-movement
(t-mouse-make-event-element current-xy-avec-time))))))))
(defun t-mouse-process-filter (proc string)
(setq t-mouse-filter-accumulator
(concat t-mouse-filter-accumulator string))
(let ((event (t-mouse-make-event)))
(while event
(if (or track-mouse
(not (eq 'mouse-movement (event-basic-type event))))
(setq unread-command-events
(nconc unread-command-events (list event))))
(if t-mouse-debug-buffer
(print unread-command-events t-mouse-debug-buffer))
(setq event (t-mouse-make-event)))))
(defun t-mouse-mouse-position-function (pos)
"Return the t-mouse-position unless running with a window system.
The (secret) scrollbar interface is not implemented yet."
(setcdr pos t-mouse-current-xy)
;; It should be possible to just send SIGTSTP to the inferior with
;; stop-process. That doesn't work; mev receives the signal fine but
;; is not really stopped: instead it returns from
;; kill(getpid(), SIGTSTP) immediately. I don't understand what's up
;; itz Tue Mar 24 14:27:38 PST 1998.
(add-hook 'suspend-hook
(function (lambda ()
(and t-mouse-process
;(stop-process t-mouse-process)
t-mouse-process "push -enone -dall -Mnone\n")))))
(add-hook 'suspend-resume-hook
(function (lambda ()
(and t-mouse-process
;(continue-process t-mouse-process)
(process-send-string t-mouse-process "pop\n")))))
(define-minor-mode t-mouse-mode
"Toggle t-mouse mode.
......@@ -277,30 +48,13 @@ Turn it on to use Emacs mouse commands, and off to use t-mouse commands."
nil " Mouse" nil :global t
(unless window-system
(if t-mouse-mode
;; Turn it on. Starts getting a stream of mouse events from an
;; asynchronous process. Only works if Emacs is running on a virtual
;; terminal without a window system.
(setq mouse-position-function #'t-mouse-mouse-position-function)
(let ((tty (t-mouse-tty))
(process-connection-type t))
(if (not (stringp tty))
(error "Cannot find a virtual terminal"))
(setq t-mouse-process
(start-process "t-mouse" nil
"mev" "-i" "-E" "-C" tty
(if t-mouse-swap-alt-keys
"-M-leftAlt" "-M-rightAlt")
"-dall" "-d-hard"
(setq t-mouse-filter-accumulator "")
(set-process-filter t-mouse-process 't-mouse-process-filter)
(set-process-query-on-exit-flag t-mouse-process nil))
;; Turn it off
(setq mouse-position-function nil)
(delete-process t-mouse-process)
(setq t-mouse-process nil))))
(unless (fboundp 'term-open-connection)
(error "Emacs must be built with Gpm to use this mode"))
(unless (term-open-connection)
(error "Can't open mouse connection")))
;; Turn it off
(provide 't-mouse)
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