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1 ;;; mic-paren.el --- highlight matching paren.
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2 ;;; Version 1.0 - 96-08-16
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3 ;;; Copyright (C) 1996 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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6 ;;; Keywords: languages, faces
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7 ;;;
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8 ;;; This file is NOT part of GNU Emacs.
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9 ;;; You may however redistribute it and/or modify it under the terms of the GNU
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10 ;;; General Public License as published by the Free Software Foundation; either
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11 ;;; version 2, or (at your option) any later version.
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12 ;;;
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13 ;;; mic-paren is distributed in the hope that it will be useful,
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14 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 ;;; GNU General Public License for more details.
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17
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18 ;;; ----------------------------------------------------------------------
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19 ;;; Short Description:
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20 ;;;
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21 ;;; Load this file and Emacs will display highlighting on whatever
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22 ;;; parenthesis matches the one before or after point. This is an extension to
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23 ;;; the paren.el file distributed with Emacs. The default behaviour is similar
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24 ;;; to paren.el but try the authors favourite options:
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25 ;;; (setq paren-face 'bold)
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26 ;;; (setq paren-sexp-mode t)
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27
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28 ;;; ----------------------------------------------------------------------
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29 ;;; Installation:
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30 ;;;
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31 ;;; o Place this file in a directory in your 'load-path.
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32 ;;; o Put the following in your .emacs file:
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33 ;;; (if window-system
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34 ;;; (require 'mic-paren))
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35 ;;; o Restart your Emacs. mic-paren is now installed and activated!
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36 ;;; o To list the possible customisation enter `C-h f paren-activate'
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37
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38 ;;; ----------------------------------------------------------------------
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39 ;;; Long Description:
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40 ;;;
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41 ;;; mic-paren.el is an extension to the packages paren.el and stig-paren.el for
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42 ;;; Emacs. When mic-paren is active (it is activated when loaded) Emacs normal
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43 ;;; parenthesis matching is deactivated. Instead parenthesis matching will be
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44 ;;; performed as soon as the cursor is positioned at a parenthesis. The
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45 ;;; matching parenthesis (or the entire expression between the parenthesises)
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46 ;;; is highlighted until the cursor is moved away from the parenthesis.
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47 ;;; Features include:
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48 ;;; o Both forward and backward parenthesis matching (_simultaneously_ if
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49 ;;; cursor is between two expressions).
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50 ;;; o Indication of mismatched parenthesises.
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51 ;;; o Option to select if only the matching parenthesis or the entire
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52 ;;; expression should be highlighted.
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53 ;;; o Message describing the match when the matching parenthesis is
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54 ;;; off-screen.
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55 ;;; o Optional delayed highlighting (useful on slow systems),
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56 ;;; o Functions to activate/deactivate mic-paren.el is provided.
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57 ;;; o Numerous options to control the behaviour and appearance of
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58 ;;; mic-paren.el.
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59 ;;;
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60 ;;; mic-paren.el is developed and tested under Emacs 19.28 - 19.31. It should
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61 ;;; work on earlier and forthcoming Emacs versions.
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62 ;;;
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63 ;;; This file can be obtained from http://www.docs.uu.se/~mic/emacs.html
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64
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65 ;; Ported to XEmacs 15-September, 1996 Steve Baur <steve@miranova.com>
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66 ;;; ======================================================================
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67 ;;; User Options:
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68
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69 (defvar paren-priority nil
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70 "*Defines the behaviour of mic-paren when point is between a closing and an
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71 opening parenthesis.
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72
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73 A value of 'close means highlight the parenthesis matching the
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74 close-parenthesis before the point.
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75
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76 A value of 'open means highlight the parenthesis matching the open-parenthesis
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77 after the point.
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78
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79 Any other value means highlight both parenthesis matching the parenthesis
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80 beside the point.")
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81
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82
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83 ;;; ------------------------------
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84
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85 (defvar paren-sexp-mode nil
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86 "*If nil only the matching parenthesis is highlighted.
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87 If non-nil the whole s-expression between the matching parenthesis is
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88 highlighted.")
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89
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90 ;;; ------------------------------
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91
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92 (defvar paren-highlight-at-point t
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93 "*If non-nil and point is after a close parenthesis, both the close and
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94 open parenthesis is highlighted. If nil, only the open parenthesis is
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95 highlighted.")
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96
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97 ;;; ------------------------------
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98
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99 (defvar paren-highlight-offscreen nil
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100 "*If non-nil stig-paren will highlight text which is not visible in the
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101 current buffer.
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102
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103 This is useful if you regularly display the current buffer in multiple windows
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104 or frames. For instance if you use follow-mode (by andersl@csd.uu.se), however
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105 it may slow down your Emacs.
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106
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107 (This variable is ignored (treated as non-nil) if you set paren-sexp-mode to
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108 non-nil.)")
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109
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110 ;;; ------------------------------
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111
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112 (defvar paren-message-offscreen t
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113 "*Display message if matching parenthesis is off-screen.")
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114
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115 ;;; ------------------------------
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116
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117 (defvar paren-message-no-match t
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118 "*Display message if no matching parenthesis is found.")
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119
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120 ;;; ------------------------------
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121
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122 (defvar paren-ding-unmatched nil
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123 "*Make noise if the cursor is at an unmatched parenthesis or no matching
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124 parenthesis is found.
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125
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126 Even if nil, typing an unmatched parenthesis produces a ding.")
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127
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128 ;;; ------------------------------
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129
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130 (defvar paren-delay nil
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131 "*This variable controls when highlighting is done. The variable has
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132 different meaning in different versions of Emacs.
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133
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134 In Emacs 19.29 and below:
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135 This variable is ignored.
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136
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137 In Emacs 19.30:
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138 A value of nil will make highlighting happen immediately (this may slow down
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139 your Emacs if running on a slow system). Any non-nil value will delay
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140 highlighting for the time specified by post-command-idle-delay.
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141
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142 In Emacs 19.31 and above:
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143 A value of nil will make highlighting happen immediately (this may slow down
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144 your Emacs if running on a slow system). If not nil, the value should be a
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145 number (possible a floating point number if your Emacs support floating point
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146 numbers). The number is the delay before mic-paren performs highlighting.
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147
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148 If you change this variable when mic-paren is active you have to re-activate
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149 (with M-x paren-activate) mic-paren for the change to take effect.")
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150
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151
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152 ;;; ------------------------------
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153
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154 (defvar paren-dont-touch-blink nil
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155 "*If non-nil mic-paren will not change the value of blink-matching-paren when
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156 activated of deactivated.
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157
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158 If nil mic-paren turns of blinking when activated and turns on blinking when
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159 deactivated.")
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160
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161 ;;; ------------------------------
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162
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163 (defvar paren-dont-activate-on-load nil
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164 "*If non-nil mic-paren will not activate itself when loaded.")
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165
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166 ;;; ------------------------------
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167
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168 (defvar paren-face (if (x-display-color-p) 'highlight 'underline)
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169 "*Face to use for showing the matching parenthesis.")
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170
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171 ;;; ------------------------------
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172
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173 (defvar paren-mismatch-face (if (x-display-color-p)
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174 (let ((fn 'paren-mismatch-face))
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175 (copy-face 'default fn)
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176 (set-face-background fn "DeepPink")
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177 fn)
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178 'modeline)
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179 "*Face to use when highlighting a mismatched parenthesis.")
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180
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181 ;;; ======================================================================
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182 ;;; User Functions:
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183
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184 ;; XEmacs compatibility
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185 (eval-and-compile
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186 (if (fboundp 'make-extent)
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187 (progn
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188 (fset 'mic-make-overlay 'make-extent)
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189 (fset 'mic-delete-overlay 'delete-extent)
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190 (fset 'mic-overlay-put 'set-extent-property)
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191 (defun mic-cancel-timer (timer) (delete-itimer timer))
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192 (defun mic-run-with-idle-timer (secs repeat function &rest args)
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193 (start-itimer "mic-paren-idle" function secs nil))
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194 )
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195 (fset 'mic-make-overlay 'make-overlay)
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196 (fset 'mic-delete-overlay 'delete-overlay)
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197 (fset 'mic-overlay-put 'overlay-put)
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198 (fset 'mic-cancel-timer 'cancel-timer)
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199 (fset 'mic-run-with-idle-timer 'run-with-idle-timer)
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200 ))
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201
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202
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203 (defun paren-activate ()
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204 "Activates mic-paren parenthesis highlighting.
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205 paren-activate deactivates the paren.el and stig-paren.el packages if they are
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206 active
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207 Options:
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208 paren-priority
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209 paren-sexp-mode
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210 paren-highlight-at-point
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211 paren-highlight-offscreen
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212 paren-message-offscreen
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213 paren-message-no-match
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214 paren-ding-unmatched
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215 paren-delay
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216 paren-dont-touch-blink
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217 paren-dont-activate-on-load
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218 paren-face
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219 paren-mismatch-face"
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220 (interactive)
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221 ;; Deactivate mic-paren.el (To remove redundant hooks)
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222 (paren-deactivate)
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223 ;; Deactivate paren.el if loaded
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224 (if (boundp 'post-command-idle-hook)
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225 (remove-hook 'post-command-idle-hook 'show-paren-command-hook))
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226 (remove-hook 'post-command-hook 'show-paren-command-hook)
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227 (and (boundp 'show-paren-overlay)
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228 show-paren-overlay
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229 (mic-delete-overlay show-paren-overlay))
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230 (and (boundp 'show-paren-overlay-1)
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231 show-paren-overlay-1
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232 (mic-delete-overlay show-paren-overlay-1))
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233 ;; Deactivate stig-paren.el if loaded
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234 (if (boundp 'post-command-idle-hook)
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235 (remove-hook 'post-command-idle-hook 'stig-paren-command-hook))
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236 (remove-hook 'post-command-hook 'stig-paren-command-hook)
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237 (remove-hook 'post-command-hook 'stig-paren-safe-command-hook)
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238 (remove-hook 'pre-command-hook 'stig-paren-delete-overlay)
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239 ;; Deactivate Emacs standard parenthesis blinking
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240 (or paren-dont-touch-blink
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241 (setq blink-matching-paren nil))
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242
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243 (cond
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244 ;; If timers are available use them
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245 ;; (Emacs 19.31 and above)
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246 ((or (featurep 'timer) (featurep 'itimer))
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247 (if (numberp paren-delay)
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248 (setq mic-paren-idle-timer
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249 (mic-run-with-idle-timer paren-delay t
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250 'mic-paren-command-idle-hook))
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251 (add-hook 'post-command-hook 'mic-paren-command-hook)))
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252 ;; If the idle hook exists assume it is functioning and use it
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253 ;; (Emacs 19.30)
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254 ((and (boundp 'post-command-idle-hook)
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255 (boundp 'post-command-idle-delay))
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256 (if paren-delay
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257 (add-hook 'post-command-idle-hook 'mic-paren-command-idle-hook)
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258 (add-hook 'post-command-hook 'mic-paren-command-hook)))
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259 ;; Check if we (at least) have a post-comand-hook, and use it
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260 ;; (Emacs 19.29 and below)
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261 ((boundp 'post-command-hook)
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262 (add-hook 'post-command-hook 'mic-paren-command-hook))
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263 ;; Not possible to install mic-paren hooks
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264 (t (error "Cannot activate mic-paren in this Emacs version"))))
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265
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266
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267
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268 (defun paren-deactivate ()
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269 "Deactivates mic-paren parenthesis highlighting"
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270 (interactive)
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271 ;; Deactivate (don't bother to check where/if mic-paren is acivte, just
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272 ;; delete all possible hooks and timers)
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273 (if (boundp 'post-command-idle-hook)
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274 (remove-hook 'post-command-idle-hook 'mic-paren-command-idle-hook))
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275 (if mic-paren-idle-timer
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276 (mic-cancel-timer mic-paren-idle-timer))
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277 (remove-hook 'post-command-hook 'mic-paren-command-hook)
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278
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279 ;; Remove any old highlighs
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280 (mic-delete-overlay mic-paren-backw-overlay)
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281 (mic-delete-overlay mic-paren-point-overlay)
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282 (mic-delete-overlay mic-paren-forw-overlay)
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283
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284 ;; Reactivate Emacs standard parenthesis blinking
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285 (or paren-dont-touch-blink
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286 (setq blink-matching-paren t))
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287 )
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288
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289 ;;; ======================================================================
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290 ;;; Internal variables:
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291
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292 (defvar mic-paren-backw-overlay (mic-make-overlay (point-min) (point-min))
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293 "Overlay for the open-paren which matches the close-paren before
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294 point. When in sexp-mode this is the overlay for the expression before point.")
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295
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296 (defvar mic-paren-point-overlay (mic-make-overlay (point-min) (point-min))
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297 "Overlay for the close-paren before point.
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298 (Not used when is sexp-mode.)")
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299
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300 (defvar mic-paren-forw-overlay (mic-make-overlay (point-min) (point-min))
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301 "Overlay for the close-paren which matches the open-paren after
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302 point. When in sexp-mode this is the overlay for the expression after point.")
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303
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304 (defvar mic-paren-idle-timer nil
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305 "Idle-timer. Used only in Emacs 19.31 and above (and if paren-delay is nil)")
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306
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307
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308
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309
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310 ;;; ======================================================================
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311 ;;; Internal function:
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312
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313
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314
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315 (defun mic-paren-command-hook ()
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316 (or executing-kbd-macro
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317 (input-pending-p) ;[This might cause trouble since the
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318 ; function is unreliable]
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319 (condition-case paren-error
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320 (mic-paren-highligt)
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321 (error
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322 (if (not (window-minibuffer-p (selected-window)))
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323 (message "mic-paren catched error (please report): %s"
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324 paren-error))))))
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325
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326 (defun mic-paren-command-idle-hook ()
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327 (condition-case paren-error
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328 (mic-paren-highligt)
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329 (error
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330 (if (not (window-minibuffer-p (selected-window)))
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331 (message "mic-paren catched error (please report): %s"
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332 paren-error)))))
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333
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334
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335 (defun mic-paren-highligt ()
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336 "The main-function of mic-paren. Does all highlighting, dinging, messages,
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337 cleaning-up."
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338 ;; Remove any old highlighting
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339 (mic-delete-overlay mic-paren-forw-overlay)
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340 (mic-delete-overlay mic-paren-point-overlay)
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341 (mic-delete-overlay mic-paren-backw-overlay)
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342
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343 ;; Handle backward highlighting (when after a close-paren):
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344 ;; If positioned after a close-paren, and
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345 ;; not before an open-paren when priority=open, and
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346 ;; the close-paren is not escaped then
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347 ;; perform highlighting
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348 ;; else
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349 ;; remove any old backward highlights
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350 (if (and (eq (char-syntax (preceding-char)) ?\))
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351 (not (and (eq (char-syntax (following-char)) ?\()
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352 (eq paren-priority 'open)))
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353 (paren-evenp (paren-backslashes-before-char (1- (point)))))
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354 (let (open)
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355 ;; Find the position for the open-paren
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356 (save-excursion
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357 (save-restriction
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358 (if blink-matching-paren-distance
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359 (narrow-to-region
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360 (max (point-min)
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361 (- (point) blink-matching-paren-distance))
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362 (point-max)))
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363 (condition-case ()
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364 (setq open (scan-sexps (point) -1))
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365 (error nil))))
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366
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367 ;; If match found
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368 ;; highlight and/or print messages
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369 ;; else
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370 ;; print no-match message
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371 ;; remove any old highlights
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372 (if open
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373 (let ((mismatch (/= (matching-paren (preceding-char))
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374 (char-after open)))
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375 (visible (pos-visible-in-window-p open)))
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376 ;; If highlight is appropriate
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377 ;; highligt
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378 ;; else
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379 ;; remove any old highlight
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380 (if (or visible paren-highlight-offscreen paren-sexp-mode)
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381 ;; If sexp-mode
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382 ;; highlight sexp
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383 ;; else
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384 ;; highlight the two parens
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385 (if paren-sexp-mode
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386 (progn
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387 (setq mic-paren-backw-overlay
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388 (mic-make-overlay open (point)))
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389 (if mismatch
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390 (mic-overlay-put mic-paren-backw-overlay
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391 'face paren-mismatch-face)
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392 (mic-overlay-put mic-paren-backw-overlay
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393 'face paren-face)))
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394 (setq mic-paren-backw-overlay
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395 (mic-make-overlay open (1+ open)))
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396 (and paren-highlight-at-point
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397 (setq mic-paren-point-overlay
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398 (mic-make-overlay (1- (point)) (point))))
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399 (if mismatch
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400 (progn
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401 (mic-overlay-put mic-paren-backw-overlay
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402 'face paren-mismatch-face)
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403 (and paren-highlight-at-point
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404 (mic-overlay-put mic-paren-point-overlay
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405 'face paren-mismatch-face)))
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406 (mic-overlay-put mic-paren-backw-overlay
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407 'face paren-face)
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408 (and paren-highlight-at-point
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409 (mic-overlay-put mic-paren-point-overlay
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410 'face paren-face)))))
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411 ;; Print messages if match is offscreen
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412 (and paren-message-offscreen
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413 (not visible)
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414 (not (window-minibuffer-p (selected-window)))
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415 (message "%s %s"
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416 (if mismatch "MISMATCH:" "Matches")
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417 (mic-paren-get-matching-open-text open)))
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418 ;; Ding if mismatch
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419 (and mismatch
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420 paren-ding-unmatched
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421 (ding)))
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422 (and paren-message-no-match
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423 (not (window-minibuffer-p (selected-window)))
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424 (message "No opening parenthesis found"))
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425 (and paren-message-no-match
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426 paren-ding-unmatched
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427 (ding)))))
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428
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429 ;; Handle forward highlighting (when before an open-paren):
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430 ;; If positioned before an open-paren, and
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431 ;; not after a close-paren when priority=close, and
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432 ;; the open-paren is not escaped then
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433 ;; perform highlighting
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434 ;; else
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435 ;; remove any old forward highlights
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436 (if (and (eq (char-syntax (following-char)) ?\()
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437 (not (and (eq (char-syntax (preceding-char)) ?\))
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438 (eq paren-priority 'close)))
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439 (paren-evenp (paren-backslashes-before-char (point))))
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440 (let (close)
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441 ;; Find the position for the close-paren
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442 (save-excursion
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443 (save-restriction
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444 (if blink-matching-paren-distance
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445 (narrow-to-region
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446 (point-min)
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447 (min (point-max)
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448 (+ (point) blink-matching-paren-distance))))
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449 (condition-case ()
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450 (setq close (scan-sexps (point) 1))
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451 (error nil))))
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452 ;; If match found
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453 ;; highlight and/or print messages
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454 ;; else
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455 ;; print no-match message
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456 ;; remove any old highlights
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457 (if close
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458 (let ((mismatch (/= (matching-paren (following-char))
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459 (char-after (1- close))))
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460 (visible (pos-visible-in-window-p close)))
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461 ;; If highlight is appropriate
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462 ;; highligt
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463 ;; else
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464 ;; remove any old highlight
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465 (if (or visible paren-highlight-offscreen paren-sexp-mode)
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466 ;; If sexp-mode
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467 ;; highlight sexp
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468 ;; else
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469 ;; highlight the two parens
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470 (if paren-sexp-mode
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471 (progn
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472 (setq mic-paren-forw-overlay
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473 (mic-make-overlay (point) close))
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474 (if mismatch
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475 (mic-overlay-put mic-paren-forw-overlay
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476 'face paren-mismatch-face)
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477 (mic-overlay-put mic-paren-forw-overlay
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478 'face paren-face)))
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479 (setq mic-paren-forw-overlay
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480 (mic-make-overlay (1- close) close))
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481 (if mismatch
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482 (mic-overlay-put mic-paren-forw-overlay
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483 'face paren-mismatch-face)
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484 (mic-overlay-put mic-paren-forw-overlay
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485 'face paren-face))))
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486
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487 ;; Print messages if match is offscreen
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488 (and paren-message-offscreen
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489 (not visible)
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490 (not (window-minibuffer-p (selected-window)))
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491 (message "%s %s"
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492 (if mismatch "MISMATCH:" "Matches")
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493 (mic-paren-get-matching-close-text close)))
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494 ;; Ding if mismatch
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495 (and mismatch
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496 paren-ding-unmatched
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497 (ding)))
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498 (and paren-message-no-match
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499 (not (window-minibuffer-p (selected-window)))
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|
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500 (message "No closing parenthesis found"))
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501 (and paren-message-no-match
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502 paren-ding-unmatched
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503 (ding))))))
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504
|
|
|
505 ;;; --------------------------------------------------
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506
|
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507 (defun mic-paren-get-matching-open-text (open)
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508 "Returns a string with the context around OPEN-paren."
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|
509 ;; If there's stuff on this line preceding the paren, then display text from
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510 ;; beginning of line to paren.
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511 ;;
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512 ;; If, however, the paren is at the beginning of a line, then skip whitespace
|
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513 ;; forward and display text from paren to end of the next line containing
|
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514 ;; non-space text.
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515 ;;
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516 ;; (Same as in stig-paren.el)
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517 (save-excursion
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518 (goto-char open)
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519 (if (save-excursion
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520 (skip-chars-backward " \t")
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521 (not (bolp)))
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|
522 (progn
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523 (beginning-of-line)
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524 (concat (buffer-substring (point) (1+ open)) "..."))
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525 (forward-char 1) ;From the beginning-of-line
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526 (skip-chars-forward "\n \t")
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527 (end-of-line)
|
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|
528 (buffer-substring open (point)))))
|
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529
|
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530
|
|
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531 (defun mic-paren-get-matching-close-text (close)
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|
532 "Returns a string with the context around CLOSE-paren."
|
|
|
533 ;; The whole line up until the close-paren with "..." appended if there are
|
|
|
534 ;; more text after the close-paren
|
|
|
535 (save-excursion
|
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536 (goto-char close)
|
|
|
537 (beginning-of-line)
|
|
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538 (concat
|
|
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539 (buffer-substring (point) close)
|
|
|
540 (progn
|
|
|
541 (goto-char close)
|
|
|
542 (if (looking-at "[ \t]*$")
|
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|
543 ""
|
|
|
544 "...")))))
|
|
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545
|
|
|
546
|
|
|
547 (defun paren-evenp (number)
|
|
|
548 "Returns t if NUMBER is an even number, nil otherwise"
|
|
|
549 (eq 0 (% number 2)))
|
|
|
550
|
|
|
551 (defun paren-backslashes-before-char (pnt)
|
|
|
552 (setq pnt (1- pnt))
|
|
|
553 (let ((n 0))
|
|
|
554 (while (and (>= pnt (point-min))
|
|
|
555 (eq (char-syntax (char-after pnt)) ?\\))
|
|
|
556 (setq n (1+ n))
|
|
|
557 (setq pnt (1- pnt)))
|
|
|
558 n))
|
|
|
559
|
|
|
560
|
|
|
561
|
|
|
562 ;;; ======================================================================
|
|
|
563 ;;; Initialisation when loading:
|
|
|
564
|
|
|
565
|
|
|
566 (or paren-dont-activate-on-load
|
|
|
567 (paren-activate))
|
|
|
568
|
|
|
569 ;;; This is in case mic-paren.el is preloaded. [Does this work? /Mic]
|
|
|
570 (add-hook 'window-setup-hook
|
|
|
571 (function (lambda ()
|
|
|
572 (and window-system
|
|
|
573 (not paren-dont-activate-on-load)
|
|
|
574 (paren-activate)))))
|
|
|
575
|
|
|
576 (provide 'mic-paren)
|
|
|
577 (provide 'paren)
|
