lisp/emacs-lisp/lucid.el

   1 ;;; lucid.el --- Emulate some Lucid Emacs functions.
   2
   3 ;; Copyright (C) 1993, 1995 Free Software Foundation, Inc.
   4
   5 ;; This file is part of GNU Emacs.
   6
   7 ;; GNU Emacs is free software; you can redistribute it and/or modify
   8 ;; it under the terms of the GNU General Public License as published by
   9 ;; the Free Software Foundation; either version 2, or (at your option)
  10 ;; any later version.
  11
  12 ;; GNU Emacs is distributed in the hope that it will be useful,
  13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;; GNU General Public License for more details.
  16
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  19 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20 ;; Boston, MA 02111-1307, USA.
  21
  22 ;;; Code:
  23
  24 ;; XEmacs autoloads CL so we might as well make use of it.
  25 (require 'cl)
  26
  27 (defalias 'current-time-seconds 'current-time)
  28
  29 (defun map-keymap (function keymap &optional sort-first)
  30   "Call FUNCTION for every binding in KEYMAP.
  31 This does not include bindings inherited from a parent keymap.
  32 FUNCTION receives two arguments each time it is called:
  33 the character (more generally, the event type) that is bound,
  34 and the binding it has.
  35
  36 Note that passing the event type directly to `define-key' does not work
  37 in Emacs 19.  We do not emulate that particular feature of Lucid Emacs.
  38 If your code does that, modify it to make a vector containing the event
  39 type that you get.  That will work in both versions of Emacs."
  40   (if sort-first
  41       (let (list)
  42         (cl-map-keymap (lambda (a b) (push (cons a b) list))
  43                        keymap)
  44         (setq list (sort list
  45                          (lambda (a b)
  46                            (setq a (car a) b (car b))
  47                            (if (integerp a)
  48                                (if (integerp b) (< a b)
  49                                  t)
  50                              (if (integerp b) t
  51                                (string< a b))))))
  52         (dolist (p list)
  53           (funcall function (car p) (cdr p))))
  54     (cl-map-keymap function keymap)))
  55
  56 (defun read-number (prompt &optional integers-only)
  57   "Read a number from the minibuffer.
  58 Keep reentering the minibuffer until we get suitable input.
  59 If optional argument INTEGERS-ONLY is non-nil, insist on an integer."
  60   (interactive)
  61   (let (success
  62         (number nil)
  63         (predicate (if integers-only 'integerp 'numberp)))
  64     (while (not success)
  65       (let ((input-string (read-string prompt)))
  66         (condition-case ()
  67             (setq number (read input-string))
  68           (error))
  69         (if (funcall predicate number)
  70             (setq success t)
  71           (let ((cursor-in-echo-area t))
  72             (message "Please type %s"
  73                      (if integers-only "an integer" "a number"))
  74             (sit-for 1)))))
  75     number))
  76
  77 (defun real-path-name (name &optional default)
  78   (file-truename (expand-file-name name default)))
  79
  80 ;; It's not clear what to return if the mouse is not in FRAME.
  81 (defun read-mouse-position (frame)
  82   (let ((pos (mouse-position)))
  83     (if (eq (car pos) frame)
  84         (cdr pos))))
  85
  86 (defun switch-to-other-buffer (arg)
  87   "Switch to the previous buffer.
  88 With a numeric arg N, switch to the Nth most recent buffer.
  89 With an arg of 0, buries the current buffer at the
  90 bottom of the buffer stack."
  91   (interactive "p")
  92   (if (eq arg 0)
  93       (bury-buffer (current-buffer)))
  94   (switch-to-buffer
  95    (if (<= arg 1) (other-buffer (current-buffer))
  96      (nth arg
  97           (apply 'nconc
  98                  (mapcar
  99                   (lambda (buf)
 100                     (if (= ?\  (string-to-char (buffer-name buf)))
 101                         nil
 102                       (list buf)))
 103                   (buffer-list)))))))
 104
 105 (defalias 'find-face 'internal-find-face)
 106 (defalias 'get-face 'internal-get-face)
 107 (defalias 'try-face-font 'internal-try-face-font)
 108
 109 (defalias 'exec-to-string 'shell-command-to-string)
 110 \f
 111 (defun make-extent (beg end &optional buffer)
 112   (make-overlay beg end buffer))
 113
 114 (defun extent-properties (extent) (overlay-properties extent))
 115 (unless (fboundp 'extent-property) (defalias 'extent-property 'overlay-get))
 116
 117 (defun extent-at (pos &optional object property before)
 118   (with-current-buffer (or object (current-buffer))
 119     (let ((overlays (overlays-at pos)))
 120       (when property
 121         (let (filtered)
 122           (while overlays
 123             (if (overlay-get (car overlays) property)
 124                 (setq filtered (cons (car overlays) filtered)))
 125             (setq overlays (cdr overlays)))
 126           (setq overlays filtered)))
 127       (setq overlays
 128             (sort overlays
 129                   (function (lambda (o1 o2)
 130                               (let ((p1 (or (overlay-get o1 'priority) 0))
 131                                     (p2 (or (overlay-get o2 'priority) 0)))
 132                                 (or (> p1 p2)
 133                                     (and (= p1 p2)
 134                                          (> (overlay-start o1) (overlay-start o2)))))))))
 135       (if before
 136           (nth 1 (memq before overlays))
 137         (car overlays)))))
 138
 139 (defun set-extent-property (extent prop value)
 140   ;; Make sure that separate adjacent extents
 141   ;; with the same mouse-face value
 142   ;; do not run together as one extent.
 143   (and (eq prop 'mouse-face)
 144        (symbolp value)
 145        (setq value (list value)))
 146   (if (eq prop 'duplicable)
 147       (cond ((and value (not (overlay-get extent prop)))
 148              ;; If becoming duplicable, copy all overlayprops to text props.
 149              (add-text-properties (overlay-start extent)
 150                                   (overlay-end extent)
 151                                   (overlay-properties extent)
 152                                   (overlay-buffer extent)))
 153             ;; If becoming no longer duplicable, remove these text props.
 154             ((and (not value) (overlay-get extent prop))
 155              (remove-text-properties (overlay-start extent)
 156                                      (overlay-end extent)
 157                                      (overlay-properties extent)
 158                                      (overlay-buffer extent))))
 159     ;; If extent is already duplicable, put this property
 160     ;; on the text as well as on the overlay.
 161     (if (overlay-get extent 'duplicable)
 162         (put-text-property  (overlay-start extent)
 163                             (overlay-end extent)
 164                             prop value (overlay-buffer extent))))
 165   (overlay-put extent prop value))
 166
 167 (defun set-extent-face (extent face)
 168   (set-extent-property extent 'face face))
 169
 170 (defun set-extent-end-glyph (extent glyph)
 171   (set-extent-property extent 'after-string glyph))
 172
 173 (defun delete-extent (extent)
 174   (set-extent-property extent 'duplicable nil)
 175   (delete-overlay extent))
 176 \f
 177 ;; Support the Lucid names with `screen' instead of `frame'.
 178
 179 (defalias 'current-screen-configuration 'current-frame-configuration)
 180 (defalias 'delete-screen 'delete-frame)
 181 (defalias 'find-file-new-screen 'find-file-other-frame)
 182 (defalias 'find-file-read-only-new-screen 'find-file-read-only-other-frame)
 183 (defalias 'find-tag-new-screen 'find-tag-other-frame)
 184 ;;(defalias 'focus-screen 'focus-frame)
 185 (defalias 'iconify-screen 'iconify-frame)
 186 (defalias 'mail-new-screen 'mail-other-frame)
 187 (defalias 'make-screen-invisible 'make-frame-invisible)
 188 (defalias 'make-screen-visible 'make-frame-visible)
 189 ;; (defalias 'minibuffer-screen-list 'minibuffer-frame-list)
 190 (defalias 'modify-screen-parameters 'modify-frame-parameters)
 191 (defalias 'next-screen 'next-frame)
 192 ;; (defalias 'next-multiscreen-window 'next-multiframe-window)
 193 ;; (defalias 'previous-multiscreen-window 'previous-multiframe-window)
 194 ;; (defalias 'redirect-screen-focus 'redirect-frame-focus)
 195 (defalias 'redraw-screen 'redraw-frame)
 196 ;; (defalias 'screen-char-height 'frame-char-height)
 197 ;; (defalias 'screen-char-width 'frame-char-width)
 198 ;; (defalias 'screen-configuration-to-register 'frame-configuration-to-register)
 199 ;; (defalias 'screen-focus 'frame-focus)
 200 (defalias 'screen-list 'frame-list)
 201 ;; (defalias 'screen-live-p 'frame-live-p)
 202 (defalias 'screen-parameters 'frame-parameters)
 203 (defalias 'screen-pixel-height 'frame-pixel-height)
 204 (defalias 'screen-pixel-width 'frame-pixel-width)
 205 (defalias 'screen-root-window 'frame-root-window)
 206 (defalias 'screen-selected-window 'frame-selected-window)
 207 (defalias 'lower-screen 'lower-frame)
 208 (defalias 'raise-screen 'raise-frame)
 209 (defalias 'screen-visible-p 'frame-visible-p)
 210 (defalias 'screenp 'framep)
 211 (defalias 'select-screen 'select-frame)
 212 (defalias 'selected-screen 'selected-frame)
 213 ;; (defalias 'set-screen-configuration 'set-frame-configuration)
 214 ;; (defalias 'set-screen-height 'set-frame-height)
 215 (defalias 'set-screen-position 'set-frame-position)
 216 (defalias 'set-screen-size 'set-frame-size)
 217 ;; (defalias 'set-screen-width 'set-frame-width)
 218 (defalias 'switch-to-buffer-new-screen 'switch-to-buffer-other-frame)
 219 ;; (defalias 'unfocus-screen 'unfocus-frame)
 220 (defalias 'visible-screen-list 'visible-frame-list)
 221 (defalias 'window-screen 'window-frame)
 222 (defalias 'x-create-screen 'x-create-frame)
 223 (defalias 'x-new-screen 'make-frame)
 224
 225 (provide 'lucid)
 226
 227 ;;; end of lucid.el