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1 ;;; mic-paren.el --- highlight matching paren.
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2 ;;; Version 1.2 - 96-09-19
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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 Recognition of "escaped" parenthesises.
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52 ;;; o Option to select if only the matching parenthesis or the entire
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53 ;;; expression should be highlighted.
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54 ;;; o Message describing the match when the matching parenthesis is
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55 ;;; off-screen.
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56 ;;; o Optional delayed highlighting (useful on slow systems),
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57 ;;; o Functions to activate/deactivate mic-paren.el is provided.
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58 ;;; o Numerous options to control the behaviour and appearance of
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59 ;;; mic-paren.el.
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60 ;;;
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61 ;;; mic-paren.el is developed and tested under Emacs 19.28 - 19.34. It should
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62 ;;; work on earlier and forthcoming Emacs versions. XEmacs compatibility has
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63 ;;; been provided by Steven L Baur <steve@altair.xemacs.org>.
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64 ;;;
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65 ;;; This file can be obtained from http://www.docs.uu.se/~mic/emacs.html
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66
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67 ;;; ======================================================================
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68 ;;; User Options:
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69
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70 (defvar paren-priority nil
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71 "*Defines the behaviour of mic-paren when point is between a closing and an
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72 opening parenthesis.
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73
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74 A value of 'close means highlight the parenthesis matching the
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75 close-parenthesis before the point.
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76
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77 A value of 'open means highlight the parenthesis matching the open-parenthesis
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78 after the point.
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79
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80 Any other value means highlight both parenthesis matching the parenthesis
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81 beside the point.")
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82
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83
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84 ;;; ------------------------------
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85
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86 (defvar paren-sexp-mode nil
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87 "*If nil only the matching parenthesis is highlighted.
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88 If non-nil the whole s-expression between the matching parenthesis is
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89 highlighted.")
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90
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91 ;;; ------------------------------
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92
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93 (defvar paren-highlight-at-point t
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94 "*If non-nil and point is after a close parenthesis, both the close and
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95 open parenthesis is highlighted. If nil, only the open parenthesis is
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96 highlighted.")
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97
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98 ;;; ------------------------------
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99
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100 (defvar paren-highlight-offscreen nil
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101 "*If non-nil stig-paren will highlight text which is not visible in the
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102 current buffer.
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103
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104 This is useful if you regularly display the current buffer in multiple windows
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105 or frames. For instance if you use follow-mode (by andersl@csd.uu.se), however
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106 it may slow down your Emacs.
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107
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108 (This variable is ignored (treated as non-nil) if you set paren-sexp-mode to
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109 non-nil.)")
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110
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111 ;;; ------------------------------
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112
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113 (defvar paren-message-offscreen t
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114 "*Display message if matching parenthesis is off-screen.")
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115
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116 ;;; ------------------------------
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117
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118 (defvar paren-message-no-match t
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119 "*Display message if no matching parenthesis is found.")
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120
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121 ;;; ------------------------------
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122
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123 (defvar paren-ding-unmatched nil
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124 "*Make noise if the cursor is at an unmatched parenthesis or no matching
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125 parenthesis is found.
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126
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127 Even if nil, typing an unmatched parenthesis produces a ding.")
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128
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129 ;;; ------------------------------
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130
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131 (defvar paren-delay nil
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132 "*This variable controls when highlighting is done. The variable has
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133 different meaning in different versions of Emacs.
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134
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135 In Emacs 19.29 and below:
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136 This variable is ignored.
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137
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138 In Emacs 19.30:
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139 A value of nil will make highlighting happen immediately (this may slow down
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140 your Emacs if running on a slow system). Any non-nil value will delay
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141 highlighting for the time specified by post-command-idle-delay.
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142
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143 In Emacs 19.31 and above:
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144 A value of nil will make highlighting happen immediately (this may slow down
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145 your Emacs if running on a slow system). If not nil, the value should be a
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146 number (possible a floating point number if your Emacs support floating point
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147 numbers). The number is the delay before mic-paren performs highlighting.
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148
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149 If you change this variable when mic-paren is active you have to re-activate
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150 (with M-x paren-activate) mic-paren for the change to take effect.")
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151
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152
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153 ;;; ------------------------------
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154
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155 (defvar paren-dont-touch-blink nil
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156 "*If non-nil mic-paren will not change the value of blink-matching-paren when
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157 activated of deactivated.
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158
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159 If nil mic-paren turns of blinking when activated and turns on blinking when
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160 deactivated.")
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161
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162 ;;; ------------------------------
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163
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164 (defvar paren-dont-activate-on-load nil
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165 "*If non-nil mic-paren will not activate itself when loaded.")
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166
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167 ;;; ------------------------------
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168
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169 (defvar paren-face (if (x-display-color-p) 'highlight 'underline)
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170 "*Face to use for showing the matching parenthesis.")
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171
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172 ;;; ------------------------------
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173
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174 (defvar paren-mismatch-face (if (x-display-color-p)
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175 (let ((fn 'paren-mismatch-face))
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176 (copy-face 'default fn)
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177 (set-face-background fn "DeepPink")
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178 fn)
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179 'modeline)
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180 "*Face to use when highlighting a mismatched parenthesis.")
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181
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182 ;;; ======================================================================
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183 ;;; User Functions:
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184
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185 ;; XEmacs compatibility (by Steven L Baur <steve@altair.xemacs.org>)
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186 (eval-and-compile
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187 (if (fboundp 'make-extent)
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188 (progn
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189 (fset 'mic-make-overlay 'make-extent)
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190 (fset 'mic-delete-overlay 'delete-extent)
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191 (fset 'mic-overlay-put 'set-extent-property)
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192 (defun mic-cancel-timer (timer) (delete-itimer timer))
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193 (defun mic-run-with-idle-timer (secs repeat function &rest args)
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194 (start-itimer "mic-paren-idle" function secs nil))
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195 )
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196 (fset 'mic-make-overlay 'make-overlay)
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197 (fset 'mic-delete-overlay 'delete-overlay)
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198 (fset 'mic-overlay-put 'overlay-put)
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199 (fset 'mic-cancel-timer 'cancel-timer)
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200 (fset 'mic-run-with-idle-timer 'run-with-idle-timer)
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201 ))
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202
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203
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204 (defun paren-activate ()
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205 "Activates mic-paren parenthesis highlighting.
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206 paren-activate deactivates the paren.el and stig-paren.el packages if they are
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207 active
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208 Options:
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209 paren-priority
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210 paren-sexp-mode
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211 paren-highlight-at-point
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212 paren-highlight-offscreen
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213 paren-message-offscreen
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214 paren-message-no-match
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215 paren-ding-unmatched
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216 paren-delay
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217 paren-dont-touch-blink
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218 paren-dont-activate-on-load
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219 paren-face
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220 paren-mismatch-face"
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221 (interactive)
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222 ;; Deactivate mic-paren.el (To remove redundant hooks)
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223 (paren-deactivate)
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224 ;; Deactivate paren.el if loaded
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225 (if (boundp 'post-command-idle-hook)
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226 (remove-hook 'post-command-idle-hook 'show-paren-command-hook))
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227 (remove-hook 'post-command-hook 'show-paren-command-hook)
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228 (and (boundp 'show-paren-overlay)
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229 show-paren-overlay
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230 (mic-delete-overlay show-paren-overlay))
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231 (and (boundp 'show-paren-overlay-1)
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232 show-paren-overlay-1
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233 (mic-delete-overlay show-paren-overlay-1))
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234 ;; Deactivate stig-paren.el if loaded
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235 (if (boundp 'post-command-idle-hook)
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236 (remove-hook 'post-command-idle-hook 'stig-paren-command-hook))
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237 (remove-hook 'post-command-hook 'stig-paren-command-hook)
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238 (remove-hook 'post-command-hook 'stig-paren-safe-command-hook)
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239 (remove-hook 'pre-command-hook 'stig-paren-delete-overlay)
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240 ;; Deactivate Emacs standard parenthesis blinking
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241 (or paren-dont-touch-blink
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242 (setq blink-matching-paren nil))
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243
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244 (cond(
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245 ;; If timers are available use them
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246 ;; (Emacs 19.31 and above)
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247 (featurep 'timer)
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248 (if (numberp paren-delay)
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249 (setq mic-paren-idle-timer
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250 (mic-run-with-idle-timer paren-delay t
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251 'mic-paren-command-idle-hook))
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252 (add-hook 'post-command-hook 'mic-paren-command-hook)))
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253 ;; If the idle hook exists assume it is functioning and use it
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254 ;; (Emacs 19.30)
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255 ((and (boundp 'post-command-idle-hook)
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256 (boundp 'post-command-idle-delay))
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257 (if paren-delay
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258 (add-hook 'post-command-idle-hook 'mic-paren-command-idle-hook)
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259 (add-hook 'post-command-hook 'mic-paren-command-hook)))
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260 ;; Check if we (at least) have a post-comand-hook, and use it
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261 ;; (Emacs 19.29 and below)
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262 ((boundp 'post-command-hook)
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263 (add-hook 'post-command-hook 'mic-paren-command-hook))
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264 ;; Not possible to install mic-paren hooks
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265 (t (error "Cannot activate mic-paren in this Emacs version"))))
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266
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267
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268
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269 (defun paren-deactivate ()
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270 "Deactivates mic-paren parenthesis highlighting"
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271 (interactive)
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272 ;; Deactivate (don't bother to check where/if mic-paren is acivte, just
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273 ;; delete all possible hooks and timers)
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274 (if (boundp 'post-command-idle-hook)
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275 (remove-hook 'post-command-idle-hook 'mic-paren-command-idle-hook))
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276 (if mic-paren-idle-timer
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277 (mic-cancel-timer mic-paren-idle-timer))
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278 (remove-hook 'post-command-hook 'mic-paren-command-hook)
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279
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280 ;; Remove any old highlighs
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281 (mic-delete-overlay mic-paren-backw-overlay)
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282 (mic-delete-overlay mic-paren-point-overlay)
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283 (mic-delete-overlay mic-paren-forw-overlay)
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284
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285 ;; Reactivate Emacs standard parenthesis blinking
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286 (or paren-dont-touch-blink
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287 (setq blink-matching-paren t))
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288 )
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289
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290 ;;; ======================================================================
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291 ;;; Internal variables:
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292
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293 (defvar mic-paren-backw-overlay (mic-make-overlay (point-min) (point-min))
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294 "Overlay for the open-paren which matches the close-paren before
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295 point. When in sexp-mode this is the overlay for the expression before point.")
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296
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297 (defvar mic-paren-point-overlay (mic-make-overlay (point-min) (point-min))
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298 "Overlay for the close-paren before point.
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299 (Not used when is sexp-mode.)")
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300
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301 (defvar mic-paren-forw-overlay (mic-make-overlay (point-min) (point-min))
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302 "Overlay for the close-paren which matches the open-paren after
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303 point. When in sexp-mode this is the overlay for the expression after point.")
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304
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305 (defvar mic-paren-idle-timer nil
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306 "Idle-timer. Used only in Emacs 19.31 and above (and if paren-delay is nil)")
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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 ;;; ======================================================================
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312 ;;; Internal function:
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313
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314
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315
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316 (defun mic-paren-command-hook ()
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317 (or executing-kbd-macro
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318 (input-pending-p) ;[This might cause trouble since the
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319 ; function is unreliable]
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320 (condition-case paren-error
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321 (mic-paren-highlight)
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322 (error
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323 (if (not (window-minibuffer-p (selected-window)))
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324 (message "mic-paren catched error (please report): %s"
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325 paren-error))))))
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326
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327 (defun mic-paren-command-idle-hook ()
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328 (condition-case paren-error
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329 (mic-paren-highlight)
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330 (error
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331 (if (not (window-minibuffer-p (selected-window)))
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332 (message "mic-paren catched error (please report): %s"
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333 paren-error)))))
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334
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335
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24
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336 (defun mic-paren-highlight ()
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337 "The main-function of mic-paren. Does all highlighting, dinging, messages,
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338 cleaning-up."
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339 ;; Remove any old highlighting
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340 (mic-delete-overlay mic-paren-forw-overlay)
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341 (mic-delete-overlay mic-paren-point-overlay)
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342 (mic-delete-overlay mic-paren-backw-overlay)
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343
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344 ;; Handle backward highlighting (when after a close-paren):
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345 ;; If positioned after a close-paren, and
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346 ;; not before an open-paren when priority=open, and
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347 ;; the close-paren is not escaped then
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348 ;; perform highlighting
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349 ;; else
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350 ;; remove any old backward highlights
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351 (if (and (eq (char-syntax (preceding-char)) ?\))
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352 (not (and (eq (char-syntax (following-char)) ?\()
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353 (eq paren-priority 'open)))
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354 (paren-evenp (paren-backslashes-before-char (1- (point)))))
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355 (let (open)
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356 ;; Find the position for the open-paren
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357 (save-excursion
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358 (save-restriction
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359 (if blink-matching-paren-distance
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360 (narrow-to-region
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361 (max (point-min)
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362 (- (point) blink-matching-paren-distance))
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363 (point-max)))
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364 (condition-case ()
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365 (setq open (scan-sexps (point) -1))
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366 (error nil))))
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367
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368 ;; If match found
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369 ;; highlight and/or print messages
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370 ;; else
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371 ;; print no-match message
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372 ;; remove any old highlights
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373 (if open
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374 (let ((mismatch (/= (matching-paren (preceding-char))
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375 (char-after open)))
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376 (visible (pos-visible-in-window-p open)))
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377 ;; If highlight is appropriate
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24
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378 ;; highlight
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6
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379 ;; else
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380 ;; remove any old highlight
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381 (if (or visible paren-highlight-offscreen paren-sexp-mode)
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382 ;; If sexp-mode
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383 ;; highlight sexp
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384 ;; else
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385 ;; highlight the two parens
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386 (if paren-sexp-mode
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387 (progn
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388 (setq mic-paren-backw-overlay
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389 (mic-make-overlay open (point)))
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390 (if mismatch
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391 (mic-overlay-put mic-paren-backw-overlay
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392 'face paren-mismatch-face)
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393 (mic-overlay-put mic-paren-backw-overlay
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394 'face paren-face)))
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395 (setq mic-paren-backw-overlay
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396 (mic-make-overlay open (1+ open)))
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397 (and paren-highlight-at-point
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398 (setq mic-paren-point-overlay
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399 (mic-make-overlay (1- (point)) (point))))
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400 (if mismatch
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401 (progn
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402 (mic-overlay-put mic-paren-backw-overlay
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403 'face paren-mismatch-face)
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404 (and paren-highlight-at-point
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405 (mic-overlay-put mic-paren-point-overlay
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406 'face paren-mismatch-face)))
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407 (mic-overlay-put mic-paren-backw-overlay
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408 'face paren-face)
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409 (and paren-highlight-at-point
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410 (mic-overlay-put mic-paren-point-overlay
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411 'face paren-face)))))
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412 ;; Print messages if match is offscreen
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413 (and paren-message-offscreen
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414 (not visible)
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415 (not (window-minibuffer-p (selected-window)))
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416 (message "%s %s"
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417 (if mismatch "MISMATCH:" "Matches")
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418 (mic-paren-get-matching-open-text open)))
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419 ;; Ding if mismatch
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420 (and mismatch
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421 paren-ding-unmatched
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422 (ding)))
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423 (and paren-message-no-match
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424 (not (window-minibuffer-p (selected-window)))
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425 (message "No opening parenthesis found"))
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426 (and paren-message-no-match
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427 paren-ding-unmatched
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428 (ding)))))
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429
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430 ;; Handle forward highlighting (when before an open-paren):
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431 ;; If positioned before an open-paren, and
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432 ;; not after a close-paren when priority=close, and
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433 ;; the open-paren is not escaped then
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434 ;; perform highlighting
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435 ;; else
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436 ;; remove any old forward highlights
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437 (if (and (eq (char-syntax (following-char)) ?\()
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438 (not (and (eq (char-syntax (preceding-char)) ?\))
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439 (eq paren-priority 'close)))
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440 (paren-evenp (paren-backslashes-before-char (point))))
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441 (let (close)
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442 ;; Find the position for the close-paren
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443 (save-excursion
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444 (save-restriction
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445 (if blink-matching-paren-distance
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446 (narrow-to-region
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447 (point-min)
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448 (min (point-max)
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449 (+ (point) blink-matching-paren-distance))))
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450 (condition-case ()
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451 (setq close (scan-sexps (point) 1))
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452 (error nil))))
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453 ;; If match found
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454 ;; highlight and/or print messages
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455 ;; else
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456 ;; print no-match message
|
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457 ;; remove any old highlights
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458 (if close
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459 (let ((mismatch (/= (matching-paren (following-char))
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460 (char-after (1- close))))
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461 (visible (pos-visible-in-window-p close)))
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|
462 ;; If highlight is appropriate
|
|
24
|
463 ;; highlight
|
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6
|
464 ;; else
|
|
|
465 ;; remove any old highlight
|
|
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466 (if (or visible paren-highlight-offscreen paren-sexp-mode)
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467 ;; If sexp-mode
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468 ;; highlight sexp
|
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469 ;; else
|
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470 ;; highlight the two parens
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471 (if paren-sexp-mode
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472 (progn
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473 (setq mic-paren-forw-overlay
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474 (mic-make-overlay (point) close))
|
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|
475 (if mismatch
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|
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476 (mic-overlay-put mic-paren-forw-overlay
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477 'face paren-mismatch-face)
|
|
|
478 (mic-overlay-put mic-paren-forw-overlay
|
|
|
479 'face paren-face)))
|
|
|
480 (setq mic-paren-forw-overlay
|
|
|
481 (mic-make-overlay (1- close) close))
|
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482 (if mismatch
|
|
|
483 (mic-overlay-put mic-paren-forw-overlay
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484 'face paren-mismatch-face)
|
|
|
485 (mic-overlay-put mic-paren-forw-overlay
|
|
|
486 'face paren-face))))
|
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|
487
|
|
|
488 ;; Print messages if match is offscreen
|
|
|
489 (and paren-message-offscreen
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|
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490 (not visible)
|
|
|
491 (not (window-minibuffer-p (selected-window)))
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|
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492 (message "%s %s"
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493 (if mismatch "MISMATCH:" "Matches")
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494 (mic-paren-get-matching-close-text close)))
|
|
|
495 ;; Ding if mismatch
|
|
|
496 (and mismatch
|
|
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497 paren-ding-unmatched
|
|
|
498 (ding)))
|
|
|
499 (and paren-message-no-match
|
|
|
500 (not (window-minibuffer-p (selected-window)))
|
|
|
501 (message "No closing parenthesis found"))
|
|
|
502 (and paren-message-no-match
|
|
|
503 paren-ding-unmatched
|
|
|
504 (ding))))))
|
|
|
505
|
|
|
506 ;;; --------------------------------------------------
|
|
|
507
|
|
|
508 (defun mic-paren-get-matching-open-text (open)
|
|
|
509 "Returns a string with the context around OPEN-paren."
|
|
|
510 ;; If there's stuff on this line preceding the paren, then display text from
|
|
|
511 ;; beginning of line to paren.
|
|
|
512 ;;
|
|
|
513 ;; If, however, the paren is at the beginning of a line, then skip whitespace
|
|
|
514 ;; forward and display text from paren to end of the next line containing
|
|
|
515 ;; non-space text.
|
|
|
516 ;;
|
|
|
517 ;; (Same as in stig-paren.el)
|
|
|
518 (save-excursion
|
|
|
519 (goto-char open)
|
|
|
520 (if (save-excursion
|
|
|
521 (skip-chars-backward " \t")
|
|
|
522 (not (bolp)))
|
|
|
523 (progn
|
|
|
524 (beginning-of-line)
|
|
|
525 (concat (buffer-substring (point) (1+ open)) "..."))
|
|
|
526 (forward-char 1) ;From the beginning-of-line
|
|
|
527 (skip-chars-forward "\n \t")
|
|
|
528 (end-of-line)
|
|
|
529 (buffer-substring open (point)))))
|
|
|
530
|
|
|
531
|
|
|
532 (defun mic-paren-get-matching-close-text (close)
|
|
|
533 "Returns a string with the context around CLOSE-paren."
|
|
|
534 ;; The whole line up until the close-paren with "..." appended if there are
|
|
|
535 ;; more text after the close-paren
|
|
|
536 (save-excursion
|
|
|
537 (goto-char close)
|
|
|
538 (beginning-of-line)
|
|
|
539 (concat
|
|
|
540 (buffer-substring (point) close)
|
|
|
541 (progn
|
|
|
542 (goto-char close)
|
|
|
543 (if (looking-at "[ \t]*$")
|
|
|
544 ""
|
|
|
545 "...")))))
|
|
|
546
|
|
|
547
|
|
|
548 (defun paren-evenp (number)
|
|
|
549 "Returns t if NUMBER is an even number, nil otherwise"
|
|
|
550 (eq 0 (% number 2)))
|
|
|
551
|
|
|
552 (defun paren-backslashes-before-char (pnt)
|
|
|
553 (setq pnt (1- pnt))
|
|
|
554 (let ((n 0))
|
|
|
555 (while (and (>= pnt (point-min))
|
|
|
556 (eq (char-syntax (char-after pnt)) ?\\))
|
|
|
557 (setq n (1+ n))
|
|
|
558 (setq pnt (1- pnt)))
|
|
|
559 n))
|
|
|
560
|
|
|
561
|
|
|
562
|
|
|
563 ;;; ======================================================================
|
|
|
564 ;;; Initialisation when loading:
|
|
|
565
|
|
|
566
|
|
|
567 (or paren-dont-activate-on-load
|
|
|
568 (paren-activate))
|
|
|
569
|
|
|
570 ;;; This is in case mic-paren.el is preloaded. [Does this work? /Mic]
|
|
|
571 (add-hook 'window-setup-hook
|
|
|
572 (function (lambda ()
|
|
|
573 (and window-system
|
|
|
574 (not paren-dont-activate-on-load)
|
|
|
575 (paren-activate)))))
|
|
|
576
|
|
|
577 (provide 'mic-paren)
|
|
|
578 (provide 'paren)
|
