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1 ;;; lazy-shot.el --- Lazy font locking for XEmacs
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2
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3 ;; Copyright (C) 1997 Jan Vroonhof
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4
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5 ;; Author: Jan Vroonhof <vroonhof@math.ethz.ch>
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6 ;; Keywords: languages, faces
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7
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8 ;; This file is part of XEmacs
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the
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22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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23 ;; Boston, MA 02111-1307, USA.
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24
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25 ;;; Synched up with: Not synched.
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26
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27 ;;; Commentary:
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28
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29 ;; This versions has basic demand lock functionality. Somebody please
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30 ;; sync further with lazy-lock v2 from FSF, customize etc.
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31 ;;
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32 ;;
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33 ;; Idea for the stealth lock function:
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34 ;;
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35 ;;
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36 ;; On an Idle itimer
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37 ;; Loop over all buffers with lazy-lock set
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38 ;; mapcar-extent in the region (point) point-max for
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39 ;; one-shot-function property
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40 ;; If not found do the same for [point-min,point]
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41 ;; font-lock the found region and delete the extent
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42
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43 ;;; Code:
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44
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45 (require 'font-lock)
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46
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47 (defvar lazy-shot-mode nil)
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48
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49
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50 (defvar lazy-shot-step-size (* 1 124)) ;; Please test diffent sizes
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51
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52 ;;;###autoload
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53 (defun lazy-shot-mode (&optional arg)
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54 "Toggle Lazy Lock mode.
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55 With arg, turn Lazy Lock mode on if and only if arg is positive."
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56 (interactive "P")
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57 (set (make-local-variable 'lazy-shot-mode)
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58 (and (if arg (> (prefix-numeric-value arg) 0) (not lazy-shot-mode))))
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59 (cond ((and lazy-shot-mode (not font-lock-mode))
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60 ;; Turned on `lazy-shot-mode' rather than `font-lock-mode'.
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61 (let ((font-lock-support-mode 'lazy-shot-mode))
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62 (font-lock-mode t)))
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63 (lazy-shot-mode
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64 ;; Turn ourselves on.
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65 (lazy-shot-install))
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66 (t
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67 ;; Turn ourselves off.
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68 (lazy-shot-unstall))))
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69
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70 ;;;###autoload
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71 (defun turn-on-lazy-shot ()
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72 "Unconditionally turn on Lazy Lock mode."
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73 (lazy-shot-mode t))
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74
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75
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76 (defun lazy-shot-shot-function (extent)
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77 "Lazy lock the extent when it has become visisble"
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78 (let ((start (extent-start-position extent))
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79 (end (extent-end-position extent))
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80 (buffer (extent-buffer extent)))
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81 (delete-extent extent)
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82 (save-excursion
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83 ;; This magic should really go into font-lock-fonity-region
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84 (goto-char start)
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85 (unless (bolp)
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86 (beginning-of-line)
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87 (setq start (point)))
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88 (goto-char end)
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89 (unless (bolp)
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90 (forward-line)
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91 (setq end (point)))
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92 (message "Lazy-shot fontifying from %s to %s in %s" start end buffer)
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93 (save-match-data
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94 (font-lock-fontify-region start end)))))
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95
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96 (defun lazy-shot-install-extent (spos epos &optional buffer)
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97 "Make an extent that will lazy-shot if it is displayed"
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98 (let ((extent (make-extent spos epos buffer)))
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99 (when extent
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100 (set-extent-one-shot-function extent
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101 'lazy-shot-shot-function))
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102 extent))
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103
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104 (defun lazy-shot-install-extents (fontifying)
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105 ;;
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106 ;; Add hook if lazy-shot.el is deferring or is fontifying on scrolling.
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107 (when fontifying
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108 (let ((start (point-min)))
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109 (while (< start (point-max))
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110 (lazy-shot-install-extent start
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111 (min (point-max) (+ start lazy-shot-step-size)))
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112 (setq start (+ start lazy-shot-step-size))))))
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113
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114 (defun lazy-shot-install ()
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115 (make-local-variable 'font-lock-fontified)
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116 (setq font-lock-fontified t)
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117 (lazy-shot-install-extents font-lock-fontified))
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118
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119 (defun lazy-shot-unstall ()
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120 ;;
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121 ;; Remove the extents.
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122 (map-extents
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123 (lambda (e arg) (delete-extent e) nil)
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124 nil nil nil nil nil 'one-shot-function 'lazy-shot-shot-function)
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125 ;;
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126 ;; Remove the fontification hooks.
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127 (remove-hook 'after-change-functions 'lazy-shot-defer-after-change t)
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128 ;;
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129 ;; If Font Lock mode is still enabled, reinstall its hook.
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130 (when font-lock-mode
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131 (add-hook 'after-change-functions 'font-lock-after-change-function nil t)))
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132
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133
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134 (provide 'lazy-shot)
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135
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136 ;;; lazy-shot.el ends here
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