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#| sawfish.wm.misc bootstrap
$Id: misc.jl,v 1.12 2002/10/04 06:33:23 jsh Exp $
Copyright (C) 1999 John Harper <john@dcs.warwick.ac.uk>
This file is part of sawmill.
sawmill 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.
sawmill 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 sawmill; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|#
(declare (in-module sawfish.wm.misc))
(open-structures '(rep
rep.regexp
rep.module-system
rep.io.files
sawfish.wm.windows.subrs
sawfish.wm.events))
(defvar *user-module* nil)
(defmacro with-server-grabbed (#!rest forms)
"Execute FORMS with the server grabbed."
`(progn
(grab-server)
(unwind-protect
(progn ,@forms)
(ungrab-server))))
(define (call-with-server-ungrabbed thunk)
"Return the result of calling the zero-parameter function THUNK. If the
server is currently grabbed, ungrab it first, restoring the original grab
status after the call to THUNK returns."
(let loop ((counter 0))
(if (server-grabbed-p)
(progn
(ungrab-server)
(loop (1+ counter)))
(unwind-protect
(thunk)
(do ((i 0 (1+ i)))
((= i counter))
(grab-server))))))
(define grab-counter 0)
(define (call-with-keyboard-grabbed thunk)
"Call the zero-parameter function THUNK with the keyboard grabbed. If unable
to grab the keyboard then THUNK won't be called."
(when (grab-keyboard)
(unwind-protect
(progn
(setq grab-counter (1+ grab-counter))
(thunk))
(when (zerop (setq grab-counter (1- grab-counter)))
(ungrab-keyboard)))))
(define (call-with-error-handler thunk)
(condition-case data
(thunk)
(error
(error-handler-function (car data) (cdr data)))))
(define (make-directory-recursively dir)
"Try to create dir and all nonexistent parent dirs (like mkdir -p)."
(while (not (file-exists-p dir))
(let ((tem dir))
(while (not (file-exists-p (expand-file-name ".." tem)))
(setq tem (expand-file-name ".." tem)))
(make-directory tem))))
(define (locate-file filename dirs)
"Search for a file called FILENAME in any of the directories named by the
list of strings DIRS."
(let loop ((rest dirs))
(cond ((null rest) nil)
((file-exists-p (expand-file-name filename (car rest)))
(expand-file-name filename (car rest)))
(t (loop (cdr rest))))))
(define (clamp x lower upper)
(cond ((< x lower) lower)
((> x upper) upper)
(t x)))
(define (clamp* x w lower upper)
(cond ((< x lower) lower)
((> (+ x w) upper) (- upper w))
(t x)))
(define (uniquify-list lst)
"Remove all duplicates from list, tests using eq, order is lost."
(let (out)
(mapc (lambda (x)
(unless (memq x out)
(setq out (cons x out)))) lst)
out))
(define (screen-dimensions)
"Return the screen dimensions in pixels as a cons cell `(WIDTH . HEIGHT)'."
(cons (screen-width) (screen-height)))
(define (pointer-head)
"Return the id of a head currently containing the mouse pointer."
(find-head (query-pointer)))
(define (current-head #!optional (w (input-focus)))
"Return the id of the `current' head."
(require 'sawfish.wm.windows)
(if (not (desktop-window-p w))
(or (and w (let ((point (window-position w))
(dims (window-dimensions w)))
(find-head (+ (car point) (quotient (car dims) 2))
(+ (cdr point) (quotient (cdr dims) 2)))))
(pointer-head))
(pointer-head)))
(define (current-head-dimensions #!optional (w (input-focus)))
"Return a cons-cell defining the size in pixels of the current head (that
containing the window W, or containing the window with input focus if W is
false). Returns the screen dimensions if no such head can be identified."
(or (and w (let ((head (current-head w)))
(if head
(head-dimensions head)
(screen-dimensions))))
(head-dimensions (pointer-head))))
(define (current-head-offset #!optional (w (input-focus)))
"Return a cons-cell defining the origin of the current head (that
containing the window W, or containing the window with input focus if W is
false). Returns '(0 . 0) if no such head can be identified."
(or (and w (let ((head (current-head w)))
(if head
(head-offset head)
(cons 0 0))))
(head-offset (pointer-head))))
(define (load-module name)
"Ensure that the module called NAME has been loaded. Note that this does
_not_ import its bindings (or even make them accessible)."
(intern-structure name))
(define (eval-in form struct-name)
"Evaluate FORM in the module called STRUCT-NAME."
(eval form (or (get-structure struct-name)
(error "Unknown module: %s" struct-name))))
(define (user-eval form)
"Evaluate FORM in the `user' module."
(eval form *user-module*))
(define (user-require feature)
"Require FEATURE in the `user' module."
(user-eval `(require ',feature)))
(define (quote-menu-item string)
"Escape any `_' characters in STRING such that the result can be used as
the label of a menu item."
(string-replace "_" "__" string))
(define (get-x-text-property w prop)
"Fetches the X property named PROP from window W and returns a
vector of strings representing the contents of the property."
(let ((value (get-x-property w prop)))
(when (and value (stringp (caddr value)))
(let ((string (caddr value)))
;; regexp code chokes on NUL bytes, so do this the long way..
(let loop ((start 0)
(point 0)
(out '()))
(cond ((= point (length string))
(apply vector (nreverse (cons (substring
string start point) out))))
((= (aref string point) 0)
(loop (1+ point) (1+ point)
(cons (substring string start point) out)))
(t (loop start (1+ point) out))))))))
(define (set-x-text-property w prop seq #!optional (encoding 'STRING))
"Set the X property named PROP on window W to the text property obtained
by concatenating the sequence of strings SEQ."
(set-x-property w prop (mapconcat identity seq 0) encoding 8))
;; exports
(export-bindings '(with-server-grabbed call-with-server-ungrabbed
call-with-keyboard-grabbed call-with-error-handler
make-directory-recursively locate-file
clamp clamp* uniquify-list screen-dimensions
pointer-head current-head current-head-dimensions
current-head-offset load-module eval-in
user-eval user-require quote-menu-item
get-x-text-property set-x-text-property))
|
