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1 ;;; mic-paren.el --- highlight matching parenthesises.
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2 ;;; Version 1.3 - 97-02-25
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3 ;;; Copyright (C) 1997 Mikael Sjödin (mic@docs.uu.se)
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4 ;;;
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5 ;;; Author: Mikael Sjödin -- mic@docs.uu.se
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102
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6 ;;; Additional code by: Vinicius Jose Latorre <vinicius@cpqd.br>
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7 ;;; Steven L Baur <steve@altair.xemacs.org>
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8 ;;;
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9 ;;; Keywords: languages, faces
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10 ;;;
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11 ;;; This file is NOT part of GNU Emacs.
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12 ;;; You may however redistribute it and/or modify it under the terms of the GNU
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13 ;;; General Public License as published by the Free Software Foundation; either
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14 ;;; version 2, or (at your option) any later version.
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15 ;;;
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16 ;;; mic-paren is distributed in the hope that it will be useful,
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17 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 ;;; GNU General Public License for more details.
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20
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21 ;;; ----------------------------------------------------------------------
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22 ;;; Short Description:
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23 ;;;
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24 ;;; Load this file and Emacs will display highlighting on whatever
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25 ;;; parenthesis matches the one before or after point. This is an extension to
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26 ;;; the paren.el file distributed with Emacs. The default behaviour is similar
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27 ;;; to paren.el but try the authors favourite options:
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28 ;;; (setq paren-face 'bold)
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29 ;;; (setq paren-sexp-mode t)
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30
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31 ;;; ----------------------------------------------------------------------
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32 ;;; Installation:
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33 ;;;
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34 ;;; o Place this file in a directory in your 'load-path.
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35 ;;; o Put the following in your .emacs file:
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36 ;;; (if window-system
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37 ;;; (require 'mic-paren))
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38 ;;; o Restart your Emacs. mic-paren is now installed and activated!
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39 ;;; o To list the possible customisation enter `C-h f paren-activate'
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102
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40 ;;;
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41
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42 ;;; ----------------------------------------------------------------------
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43 ;;; Long Description:
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44 ;;;
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45 ;;; mic-paren.el is an extension to the packages paren.el and stig-paren.el for
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46 ;;; Emacs. When mic-paren is active (it is activated when loaded) Emacs normal
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47 ;;; parenthesis matching is deactivated. Instead parenthesis matching will be
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48 ;;; performed as soon as the cursor is positioned at a parenthesis. The
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49 ;;; matching parenthesis (or the entire expression between the parenthesises)
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50 ;;; is highlighted until the cursor is moved away from the parenthesis.
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51 ;;; Features include:
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52 ;;; o Both forward and backward parenthesis matching (simultaneously if
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53 ;;; cursor is between two expressions).
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54 ;;; o Indication of mismatched parenthesises.
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55 ;;; o Recognition of "escaped" parenthesises.
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56 ;;; o Option to select if only the matching parenthesis or the entire
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57 ;;; expression should be highlighted.
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58 ;;; o Message describing the match when the matching parenthesis is
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59 ;;; off-screen.
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60 ;;; o Optional delayed highlighting (useful on slow systems),
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61 ;;; o Functions to activate/deactivate mic-paren.el is provided.
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62 ;;; o Numerous options to control the behaviour and appearance of
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63 ;;; mic-paren.el.
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64 ;;;
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65 ;;; mic-paren.el is developed and tested under Emacs 19.28 - 19.34. It should
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66 ;;; work on earlier and forthcoming Emacs versions. XEmacs compatibility has
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67 ;;; been provided by Steven L Baur <steve@altair.xemacs.org>. Jan Dubois
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68 ;;; (jaduboi@ibm.net) provided help to get mic-paren to work in OS/2.
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69 ;;;
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70 ;;; This file can be obtained from http://www.docs.uu.se/~mic/emacs.html
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71
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72 ;;; ----------------------------------------------------------------------
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73 ;;; Versions:
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74 ;;;
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75 ;;; v1.3 Added code from Vinicius Jose Latorre <vinicius@cpqd.br> to
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76 ;;; highlight unmathced parenthesises (useful in minibuffer)
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77 ;;;
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78 ;;; v1.2.1 Fixed stuff to work with OS/2 emx-emacs
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79 ;;; - checks if x-display-color-p is bound before calling it
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80 ;;; - changed how X/Lucid Emacs is deteced
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81 ;;; Added automatic load of the timer-feature (+ variable to disable
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82 ;;; the loading)
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83
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84 ;;; ======================================================================
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85 ;;; User Options:
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86
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87 (defvar paren-priority nil
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88 "*Defines the behaviour of mic-paren when point is between a closing and an
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89 opening parenthesis.
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90
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91 A value of 'close means highlight the parenthesis matching the
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92 close-parenthesis before the point.
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93
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94 A value of 'open means highlight the parenthesis matching the open-parenthesis
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95 after the point.
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96
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97 Any other value means highlight both parenthesis matching the parenthesis
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98 beside the point.")
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99
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100
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101 ;;; ------------------------------
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102
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103 (defvar paren-sexp-mode nil
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104 "*If nil only the matching parenthesis is highlighted.
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105 If non-nil the whole s-expression between the matching parenthesis is
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106 highlighted.")
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107
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108 ;;; ------------------------------
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109
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110 (defvar paren-highlight-at-point t
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111 "*If non-nil and point is after a close parenthesis, both the close and
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112 open parenthesis is highlighted. If nil, only the open parenthesis is
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113 highlighted.")
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114
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115 ;;; ------------------------------
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116
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117 (defvar paren-highlight-offscreen nil
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118 "*If non-nil stig-paren will highlight text which is not visible in the
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119 current buffer.
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120
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121 This is useful if you regularly display the current buffer in multiple windows
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122 or frames. For instance if you use follow-mode (by andersl@csd.uu.se), however
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123 it may slow down your Emacs.
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124
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125 (This variable is ignored (treated as non-nil) if you set paren-sexp-mode to
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126 non-nil.)")
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127
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128 ;;; ------------------------------
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129
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130 (defvar paren-message-offscreen t
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131 "*Display message if matching parenthesis is off-screen.")
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132
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133 ;;; ------------------------------
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134
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135 (defvar paren-message-no-match t
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136 "*Display message if no matching parenthesis is found.")
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137
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138 ;;; ------------------------------
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139
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140 (defvar paren-ding-unmatched nil
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141 "*Make noise if the cursor is at an unmatched parenthesis or no matching
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142 parenthesis is found.
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143
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144 Even if nil, typing an unmatched parenthesis produces a ding.")
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145
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146 ;;; ------------------------------
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147
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148 (defvar paren-delay nil
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149 "*This variable controls when highlighting is done. The variable has
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150 different meaning in different versions of Emacs.
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151
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152 In Emacs 19.29 and below:
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153 This variable is ignored.
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154
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155 In Emacs 19.30:
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156 A value of nil will make highlighting happen immediately (this may slow down
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157 your Emacs if running on a slow system). Any non-nil value will delay
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158 highlighting for the time specified by post-command-idle-delay.
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159
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160 In Emacs 19.31 and above:
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161 A value of nil will make highlighting happen immediately (this may slow down
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162 your Emacs if running on a slow system). If not nil, the value should be a
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163 number (possible a floating point number if your Emacs support floating point
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164 numbers). The number is the delay before mic-paren performs highlighting.
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165
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166 If you change this variable when mic-paren is active you have to re-activate
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167 (with M-x paren-activate) mic-paren for the change to take effect.")
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168
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169
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170 ;;; ------------------------------
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171
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172 (defvar paren-dont-touch-blink nil
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173 "*If non-nil mic-paren will not change the value of blink-matching-paren when
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174 activated of deactivated.
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175
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176 If nil mic-paren turns of blinking when activated and turns on blinking when
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177 deactivated.")
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178
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179 ;;; ------------------------------
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180
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181 (defvar paren-dont-activate-on-load nil
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182 "*If non-nil mic-paren will not activate itself when loaded.")
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183
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184 ;;; ------------------------------
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185
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186 (defvar paren-dont-load-timer (not (string-match "XEmacs\\|Lucid"
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187 emacs-version))
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188 "*If non-nil mic-paren will not try to load the timer-feature when loaded.
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189
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190 (I have no idea why you'd ever want to set this to non-nil but I hate packages
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191 which loads/activates stuff I don't want to use so I provide this way to prevent
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192 the loading if someone doesn't want timers to be loaded.)")
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193
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194 ;;; ------------------------------
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195
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196 (defvar paren-face (if (and (fboundp 'x-display-color-p)
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197 (x-display-color-p))
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198 'highlight 'underline)
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199 "*Face to use for showing the matching parenthesis.")
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200
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201 ;;; ------------------------------
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202
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102
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203 (defvar paren-mismatch-face (if (and (fboundp 'x-display-color-p)
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204 (x-display-color-p))
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205 (let ((fn 'paren-mismatch-face))
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206 (copy-face 'default fn)
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207 (set-face-background fn "DeepPink")
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208 fn)
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209 'modeline)
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210 "*Face to use when highlighting a mismatched parenthesis.")
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211
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102
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212 ;;; ------------------------------
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213
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214 (defvar paren-no-match-face (if (x-display-color-p)
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215 (let ((fn 'paren-no-match-face))
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216 (copy-face 'default fn)
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217 (set-face-background fn "yellow")
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218 fn)
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219 'default)
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220 "*Face to use when highlighting an unmatched parenthesis.")
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221
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222 ;;; ======================================================================
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223 ;;; User Functions:
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224
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102
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225 ;; XEmacs compatibility (mainly by Steven L Baur <steve@altair.xemacs.org>)
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226 (eval-and-compile
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227 (if (string-match "\\(Lucid\\|XEmacs\\)" emacs-version)
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228 (progn
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229 (fset 'mic-make-overlay 'make-extent)
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230 (fset 'mic-delete-overlay 'delete-extent)
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231 (fset 'mic-overlay-put 'set-extent-property)
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232 (defun mic-cancel-timer (timer) (delete-itimer timer))
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233 (fset 'mic-run-with-idle-timer 'start-itimer)
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234 )
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235 (fset 'mic-make-overlay 'make-overlay)
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236 (fset 'mic-delete-overlay 'delete-overlay)
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237 (fset 'mic-overlay-put 'overlay-put)
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238 (fset 'mic-cancel-timer 'cancel-timer)
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239 (fset 'mic-run-with-idle-timer 'run-with-idle-timer)
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240 ))
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241
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242
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243 (defun paren-activate ()
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244 "Activates mic-paren parenthesis highlighting.
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245 paren-activate deactivates the paren.el and stig-paren.el packages if they are
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246 active
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247 Options:
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248 paren-priority
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249 paren-sexp-mode
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250 paren-highlight-at-point
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251 paren-highlight-offscreen
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252 paren-message-offscreen
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253 paren-message-no-match
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254 paren-ding-unmatched
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255 paren-delay
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256 paren-dont-touch-blink
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257 paren-dont-activate-on-load
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258 paren-face
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259 paren-mismatch-face"
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260 (interactive)
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261 ;; Deactivate mic-paren.el (To remove redundant hooks)
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262 (paren-deactivate)
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263 ;; Deactivate paren.el if loaded
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264 (if (boundp 'post-command-idle-hook)
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265 (remove-hook 'post-command-idle-hook 'show-paren-command-hook))
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266 (remove-hook 'post-command-hook 'show-paren-command-hook)
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267 (and (boundp 'show-paren-overlay)
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268 show-paren-overlay
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269 (mic-delete-overlay show-paren-overlay))
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270 (and (boundp 'show-paren-overlay-1)
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271 show-paren-overlay-1
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272 (mic-delete-overlay show-paren-overlay-1))
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273 ;; Deactivate stig-paren.el if loaded
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274 (if (boundp 'post-command-idle-hook)
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275 (remove-hook 'post-command-idle-hook 'stig-paren-command-hook))
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276 (remove-hook 'post-command-hook 'stig-paren-command-hook)
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277 (remove-hook 'post-command-hook 'stig-paren-safe-command-hook)
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278 (remove-hook 'pre-command-hook 'stig-paren-delete-overlay)
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279 ;; Deactivate Emacs standard parenthesis blinking
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280 (or paren-dont-touch-blink
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281 (setq blink-matching-paren nil))
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282
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283 (cond(
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284 ;; If timers are available use them
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285 ;; (Emacs 19.31 and above)
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286 (featurep 'timer)
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287 (if (numberp paren-delay)
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288 (setq mic-paren-idle-timer
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289 (mic-run-with-idle-timer paren-delay t
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290 'mic-paren-command-idle-hook))
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291 (add-hook 'post-command-hook 'mic-paren-command-hook)))
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292 ;; If the idle hook exists assume it is functioning and use it
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293 ;; (Emacs 19.30)
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294 ((and (boundp 'post-command-idle-hook)
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295 (boundp 'post-command-idle-delay))
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296 (if paren-delay
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297 (add-hook 'post-command-idle-hook 'mic-paren-command-idle-hook)
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298 (add-hook 'post-command-hook 'mic-paren-command-hook)))
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299 ;; Check if we (at least) have a post-comand-hook, and use it
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300 ;; (Emacs 19.29 and below)
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301 ((boundp 'post-command-hook)
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302 (add-hook 'post-command-hook 'mic-paren-command-hook))
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303 ;; Not possible to install mic-paren hooks
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304 (t (error "Cannot activate mic-paren in this Emacs version"))))
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305
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306
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307
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308 (defun paren-deactivate ()
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309 "Deactivates mic-paren parenthesis highlighting"
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310 (interactive)
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311 ;; Deactivate (don't bother to check where/if mic-paren is acivte, just
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312 ;; delete all possible hooks and timers)
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313 (if (boundp 'post-command-idle-hook)
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314 (remove-hook 'post-command-idle-hook 'mic-paren-command-idle-hook))
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315 (if mic-paren-idle-timer
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316 (mic-cancel-timer mic-paren-idle-timer))
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317 (remove-hook 'post-command-hook 'mic-paren-command-hook)
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318
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319 ;; Remove any old highlighs
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320 (mic-delete-overlay mic-paren-backw-overlay)
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321 (mic-delete-overlay mic-paren-point-overlay)
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322 (mic-delete-overlay mic-paren-forw-overlay)
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323
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324 ;; Reactivate Emacs standard parenthesis blinking
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325 (or paren-dont-touch-blink
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326 (setq blink-matching-paren t))
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327 )
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328
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329 ;;; ======================================================================
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330 ;;; Internal variables:
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331
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332 (defvar mic-paren-backw-overlay (mic-make-overlay (point-min) (point-min))
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333 "Overlay for the open-paren which matches the close-paren before
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334 point. When in sexp-mode this is the overlay for the expression before point.")
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335
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336 (defvar mic-paren-point-overlay (mic-make-overlay (point-min) (point-min))
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337 "Overlay for the close-paren before point.
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338 (Not used when is sexp-mode.)")
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339
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340 (defvar mic-paren-forw-overlay (mic-make-overlay (point-min) (point-min))
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341 "Overlay for the close-paren which matches the open-paren after
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342 point. When in sexp-mode this is the overlay for the expression after point.")
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343
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344 (defvar mic-paren-idle-timer nil
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345 "Idle-timer. Used only in Emacs 19.31 and above (and if paren-delay is nil)")
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346
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347
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348
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349
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350 ;;; ======================================================================
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351 ;;; Internal function:
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352
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353
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354
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355 (defun mic-paren-command-hook ()
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356 (or executing-kbd-macro
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357 (input-pending-p) ;[This might cause trouble since the
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358 ; function is unreliable]
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359 (condition-case paren-error
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102
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360 (mic-paren-highligt)
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6
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361 (error
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362 (if (not (window-minibuffer-p (selected-window)))
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363 (message "mic-paren catched error (please report): %s"
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364 paren-error))))))
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365
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366 (defun mic-paren-command-idle-hook ()
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367 (condition-case paren-error
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102
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368 (mic-paren-highligt)
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6
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369 (error
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370 (if (not (window-minibuffer-p (selected-window)))
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371 (message "mic-paren catched error (please report): %s"
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372 paren-error)))))
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373
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374
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102
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375 (defun mic-paren-highligt ()
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6
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376 "The main-function of mic-paren. Does all highlighting, dinging, messages,
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377 cleaning-up."
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378 ;; Remove any old highlighting
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379 (mic-delete-overlay mic-paren-forw-overlay)
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380 (mic-delete-overlay mic-paren-point-overlay)
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381 (mic-delete-overlay mic-paren-backw-overlay)
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382
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383 ;; Handle backward highlighting (when after a close-paren):
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384 ;; If positioned after a close-paren, and
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385 ;; not before an open-paren when priority=open, and
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386 ;; the close-paren is not escaped then
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387 ;; perform highlighting
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388 ;; else
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389 ;; remove any old backward highlights
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390 (if (and (eq (char-syntax (preceding-char)) ?\))
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391 (not (and (eq (char-syntax (following-char)) ?\()
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392 (eq paren-priority 'open)))
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393 (paren-evenp (paren-backslashes-before-char (1- (point)))))
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394 (let (open)
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395 ;; Find the position for the open-paren
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396 (save-excursion
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397 (save-restriction
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398 (if blink-matching-paren-distance
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399 (narrow-to-region
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400 (max (point-min)
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401 (- (point) blink-matching-paren-distance))
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402 (point-max)))
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403 (condition-case ()
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404 (setq open (scan-sexps (point) -1))
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405 (error nil))))
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406
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407 ;; If match found
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102
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408 ;; highlight expression and/or print messages
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6
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409 ;; else
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102
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410 ;; highlight unmatched paren
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6
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411 ;; print no-match message
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412 (if open
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413 (let ((mismatch (/= (matching-paren (preceding-char))
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414 (char-after open)))
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415 (visible (pos-visible-in-window-p open)))
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416 ;; If highlight is appropriate
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102
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417 ;; highligt
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6
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418 ;; else
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419 ;; remove any old highlight
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420 (if (or visible paren-highlight-offscreen paren-sexp-mode)
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421 ;; If sexp-mode
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422 ;; highlight sexp
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423 ;; else
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424 ;; highlight the two parens
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425 (if paren-sexp-mode
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426 (progn
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427 (setq mic-paren-backw-overlay
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428 (mic-make-overlay open (point)))
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429 (if mismatch
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430 (mic-overlay-put mic-paren-backw-overlay
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431 'face paren-mismatch-face)
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432 (mic-overlay-put mic-paren-backw-overlay
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433 'face paren-face)))
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434 (setq mic-paren-backw-overlay
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435 (mic-make-overlay open (1+ open)))
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436 (and paren-highlight-at-point
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437 (setq mic-paren-point-overlay
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438 (mic-make-overlay (1- (point)) (point))))
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439 (if mismatch
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440 (progn
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441 (mic-overlay-put mic-paren-backw-overlay
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442 'face paren-mismatch-face)
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443 (and paren-highlight-at-point
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444 (mic-overlay-put mic-paren-point-overlay
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445 'face paren-mismatch-face)))
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446 (mic-overlay-put mic-paren-backw-overlay
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447 'face paren-face)
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448 (and paren-highlight-at-point
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449 (mic-overlay-put mic-paren-point-overlay
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450 'face paren-face)))))
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451 ;; Print messages if match is offscreen
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452 (and paren-message-offscreen
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453 (not visible)
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454 (not (window-minibuffer-p (selected-window)))
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455 (message "%s %s"
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456 (if mismatch "MISMATCH:" "Matches")
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457 (mic-paren-get-matching-open-text open)))
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458 ;; Ding if mismatch
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459 (and mismatch
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460 paren-ding-unmatched
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461 (ding)))
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102
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462 (setq mic-paren-backw-overlay
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463 (mic-make-overlay (1- (point)) (point)))
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464 (mic-overlay-put mic-paren-backw-overlay
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465 'face paren-no-match-face)
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6
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466 (and paren-message-no-match
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467 (not (window-minibuffer-p (selected-window)))
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468 (message "No opening parenthesis found"))
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469 (and paren-message-no-match
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470 paren-ding-unmatched
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471 (ding)))))
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472
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473 ;; Handle forward highlighting (when before an open-paren):
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474 ;; If positioned before an open-paren, and
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475 ;; not after a close-paren when priority=close, and
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476 ;; the open-paren is not escaped then
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477 ;; perform highlighting
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478 ;; else
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479 ;; remove any old forward highlights
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480 (if (and (eq (char-syntax (following-char)) ?\()
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481 (not (and (eq (char-syntax (preceding-char)) ?\))
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482 (eq paren-priority 'close)))
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483 (paren-evenp (paren-backslashes-before-char (point))))
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484 (let (close)
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485 ;; Find the position for the close-paren
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486 (save-excursion
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487 (save-restriction
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488 (if blink-matching-paren-distance
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489 (narrow-to-region
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490 (point-min)
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491 (min (point-max)
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492 (+ (point) blink-matching-paren-distance))))
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493 (condition-case ()
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494 (setq close (scan-sexps (point) 1))
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495 (error nil))))
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496 ;; If match found
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102
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497 ;; highlight expression and/or print messages
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6
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498 ;; else
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102
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499 ;; highligt unmatched paren
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6
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500 ;; print no-match message
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501 (if close
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502 (let ((mismatch (/= (matching-paren (following-char))
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503 (char-after (1- close))))
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504 (visible (pos-visible-in-window-p close)))
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505 ;; If highlight is appropriate
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102
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506 ;; highligt
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6
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507 ;; else
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508 ;; remove any old highlight
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509 (if (or visible paren-highlight-offscreen paren-sexp-mode)
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510 ;; If sexp-mode
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511 ;; highlight sexp
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512 ;; else
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513 ;; highlight the two parens
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514 (if paren-sexp-mode
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515 (progn
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516 (setq mic-paren-forw-overlay
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517 (mic-make-overlay (point) close))
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518 (if mismatch
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519 (mic-overlay-put mic-paren-forw-overlay
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520 'face paren-mismatch-face)
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521 (mic-overlay-put mic-paren-forw-overlay
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522 'face paren-face)))
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523 (setq mic-paren-forw-overlay
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524 (mic-make-overlay (1- close) close))
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525 (if mismatch
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526 (mic-overlay-put mic-paren-forw-overlay
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527 'face paren-mismatch-face)
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528 (mic-overlay-put mic-paren-forw-overlay
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529 'face paren-face))))
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530
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531 ;; Print messages if match is offscreen
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532 (and paren-message-offscreen
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533 (not visible)
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534 (not (window-minibuffer-p (selected-window)))
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535 (message "%s %s"
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536 (if mismatch "MISMATCH:" "Matches")
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537 (mic-paren-get-matching-close-text close)))
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538 ;; Ding if mismatch
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539 (and mismatch
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540 paren-ding-unmatched
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541 (ding)))
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102
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542 (setq mic-paren-forw-overlay
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543 (mic-make-overlay (point) (1+ (point))))
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544 (mic-overlay-put mic-paren-forw-overlay
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545 'face paren-no-match-face)
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6
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546 (and paren-message-no-match
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547 (not (window-minibuffer-p (selected-window)))
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548 (message "No closing parenthesis found"))
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549 (and paren-message-no-match
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550 paren-ding-unmatched
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551 (ding))))))
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552
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553 ;;; --------------------------------------------------
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554
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555 (defun mic-paren-get-matching-open-text (open)
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556 "Returns a string with the context around OPEN-paren."
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557 ;; If there's stuff on this line preceding the paren, then display text from
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558 ;; beginning of line to paren.
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559 ;;
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560 ;; If, however, the paren is at the beginning of a line, then skip whitespace
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561 ;; forward and display text from paren to end of the next line containing
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562 ;; non-space text.
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563 ;;
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564 ;; (Same as in stig-paren.el)
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565 (save-excursion
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566 (goto-char open)
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567 (if (save-excursion
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568 (skip-chars-backward " \t")
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569 (not (bolp)))
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570 (progn
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571 (beginning-of-line)
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572 (concat (buffer-substring (point) (1+ open)) "..."))
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573 (forward-char 1) ;From the beginning-of-line
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574 (skip-chars-forward "\n \t")
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575 (end-of-line)
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576 (buffer-substring open (point)))))
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577
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578
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579 (defun mic-paren-get-matching-close-text (close)
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580 "Returns a string with the context around CLOSE-paren."
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581 ;; The whole line up until the close-paren with "..." appended if there are
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582 ;; more text after the close-paren
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583 (save-excursion
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584 (goto-char close)
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585 (beginning-of-line)
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586 (concat
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587 (buffer-substring (point) close)
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588 (progn
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589 (goto-char close)
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590 (if (looking-at "[ \t]*$")
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591 ""
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592 "...")))))
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593
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594
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595 (defun paren-evenp (number)
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596 "Returns t if NUMBER is an even number, nil otherwise"
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597 (eq 0 (% number 2)))
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598
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599 (defun paren-backslashes-before-char (pnt)
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600 (setq pnt (1- pnt))
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601 (let ((n 0))
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602 (while (and (>= pnt (point-min))
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603 (eq (char-syntax (char-after pnt)) ?\\))
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604 (setq n (1+ n))
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605 (setq pnt (1- pnt)))
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606 n))
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607
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608
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609
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610 ;;; ======================================================================
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611 ;;; Initialisation when loading:
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612
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102
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613 ;;; Try to load the timer feature if its not already loaded
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614 (or paren-dont-load-timer
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615 (featurep 'timer)
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616 (condition-case ()
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617 (require 'timer)
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618 (error nil)))
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619
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6
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620
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621 (or paren-dont-activate-on-load
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622 (paren-activate))
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623
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624 ;;; This is in case mic-paren.el is preloaded. [Does this work? /Mic]
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625 (add-hook 'window-setup-hook
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626 (function (lambda ()
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627 (and window-system
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628 (not paren-dont-activate-on-load)
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629 (paren-activate)))))
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630
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631 (provide 'mic-paren)
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632 (provide 'paren)
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