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1 ;;; hideshow.el --- minor mode cmds to selectively display blocks of code
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2
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3 ;;; Copyright (C) 1994,1995 Free Software Foundation
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4
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5 ;;; Author: Thien-Thi Nguyen <ttn@netcom.com>
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6 ;;; Version: 3.4
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7 ;;; Keywords: C C++ lisp tools editing
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8 ;;; Time-of-Day-Author-Most-Likely-to-be-Recalcitrant: early morning
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9
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10 ;;; This file is part of GNU Emacs.
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11
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12 ;;; GNU Emacs is free software; you can redistribute it and/or modify it
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13 ;;; under the terms of the GNU General Public License as published by the
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14 ;;; Free Software Foundation; either version 2 of the License, or (at your
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15 ;;; option) any later version.
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16 ;;;
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17 ;;; GNU Emacs is distributed in the hope that it will be useful, but WITHOUT
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18 ;;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 ;;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 ;;; for more details.
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21 ;;;
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22 ;;; You should have received a copy of the GNU General Public License along
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23 ;;; with this program; if not, write to the Free Software Foundation, Inc.,
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24 ;;; 675 Mass Ave, Cambridge, MA 02139, USA.
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25
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26 ;;; LCD Archive Entry:
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27 ;;; hideshow|Thien-Thi Nguyen|ttn@netcom.com|
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28 ;;; minor mode commands to selectively display blocks of code|
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29 ;;; 18-Oct-1994|3.4|~/modes/hideshow.el.Z|
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30
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31 ;;; Commentary:
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32
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33 ;;; This file provides `hs-minor-mode'. When active, six commands:
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34 ;;; hs-{hide,show}-{all,block}, hs-show-region and hs-minor-mode
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35 ;;; are available. They implement block hiding and showing. Blocks are
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36 ;;; defined in mode-specific way. In c-mode or c++-mode, they are simply
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37 ;;; curly braces, while in lisp-ish modes they are parens. Multi-line
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38 ;;; comments (c-mode) can also be hidden. The command M-x hs-minor-mode
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39 ;;; toggles the minor mode or sets it (similar to outline minor mode).
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40 ;;; See documentation for each command for more info.
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41 ;;;
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42 ;;; The variable `hs-unbalance-handler-method' controls hideshow's behavior
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43 ;;; in the case of "unbalanced parentheses". See doc for more info.
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44
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45 ;;; Suggested usage:
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46
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47 ;;; (load-library "hideshow")
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48 ;;; (defun my-hs-setup () "enables hideshow and binds some commands"
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49 ;;; (hs-minor-mode 1)
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50 ;;; (define-key hs-minor-mode-map "\C-ch" 'hs-hide-block)
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51 ;;; (define-key hs-minor-mode-map "\C-cs" 'hs-show-block)
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52 ;;; (define-key hs-minro-mode-map "\C-cH" 'hs-hide-all)
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53 ;;; (define-key hs-minro-mode-map "\C-cS" 'hs-show-all)
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54 ;;; (define-key hs-minor-mode-map "\C-cR" 'hs-show-region))
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55 ;;; (add-hook 'X-mode-hook 'my-hs-setup t) ; other modes similarly
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56 ;;;
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57 ;;; where X = {emacs-lisp,c,c++,perl,...}. See the doc for the variable
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58 ;;; `hs-special-modes-alist' if you'd like to use hideshow w/ other modes.
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59
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60 ;;; Etc:
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61
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62 ;;; Bug reports and fixes welcome (comments, too). Thanks go to
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63 ;;; Dean Andrews <adahome@ix.netcom.com>
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64 ;;; Preston F. Crow <preston.f.crow@dartmouth.edu>
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65 ;;; Gael Marziou <gael@gnlab030.grenoble.hp.com>
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66 ;;; Keith Sheffield <sheff@edcsgw2.cr.usgs.gov>
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67 ;;; Jan Djarv <jan.djarv@sa.erisoft.se>
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68 ;;; Lars Lindberg <qhslali@aom.ericsson.se>
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69 ;;; Alf-Ivar Holm <alfh@ifi.uio.no>
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70 ;;; for valuable feedback, code and bug reports.
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71
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72 ;;; Code:
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73
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74
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75 ;;;----------------------------------------------------------------------------
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76 ;;; user-configurable variables
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77
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78 (defvar hs-unbalance-handler-method 'top-level
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79 "*Symbol representing how \"unbalanced parentheses\" should be handled.
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80 This error is usually signalled by hs-show-block. One of four values:
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81 `top-level', `next-line', `signal' or `ignore'. Default is `top-level'.
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82
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83 - `top-level' -- Show top-level block containing the currently troublesome
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84 block.
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85 - `next-line' -- Use the fact that, for an already hidden block, its end
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86 will be on the next line. Attempt to show this block.
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87 - `signal' -- Pass the error through, stopping execution.
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88 - `ignore' -- Ignore the error, continuing execution.
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89
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90 Values other than these four will be interpreted as `signal'.")
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91
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92 (defvar hs-special-modes-alist '((c-mode "{" "}")
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93 (c++-mode "{" "}"))
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94 "*Alist of the form (MODE START-RE END-RE FORWARD-SEXP-FUNC).
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95 If present, hideshow will use these values for the start and end regexps,
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96 respectively. Since Algol-ish languages do not have single-character
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97 block delimiters, the function `forward-sexp' which is used by hideshow
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98 doesn't work. In this case, if a similar function is provided, you can
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99 register it and have hideshow use it instead of `forward-sexp'. To add
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100 more values, use
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101
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102 \t(pushnew '(new-mode st-re end-re function-name)
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103 \t hs-special-modes-alist :test 'equal)
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104
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105 For example:
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106
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107 \t(pushnew '(simula-mode \"begin\" \"end\" simula-next-statement)
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108 \t hs-special-modes-alist :test 'equal)
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109
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110 Note that the regexps should not contain leading or trailing whitespace.")
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111
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112 (defvar hs-hide-hooks nil
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113 "*Hooks called at the end of hs-hide-all and hs-hide-block.")
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114
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115 (defvar hs-show-hooks nil
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116 "*Hooks called at the end of hs-show-all, hs-show-block and hs-show-region.")
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117
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118 (defvar hs-minor-mode-prefix "\C-c"
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119 "*Prefix key to use for hideshow commands in hideshow minor mode.")
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120
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121
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122 ;;;----------------------------------------------------------------------------
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123 ;;; internal variables
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124
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125 ;;;###autoload
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126 (defvar hs-minor-mode nil
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127 "Non-nil if using hideshow mode as a minor mode of some other mode.
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128 Use the command `hs-minor-mode' to toggle this variable.")
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129
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130 (defvar hs-minor-mode-map nil
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131 "Mode map for hideshow minor mode.")
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132
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133 (defvar hs-menu-bar nil
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134 "Menu bar for hideshow minor mode (Xemacs only).")
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135
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136 (defvar hs-c-start-regexp nil
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137 "Regexp for beginning of comments. Buffer-local.
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138 Differs from mode-specific comment regexps in that surrounding
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139 whitespace is stripped.")
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140
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141 (defvar hs-c-end-regexp nil
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142 "Regexp for end of comments. Buffer-local.
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143 See `hs-c-start-regexp'.")
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144
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145 (defvar hs-block-start-regexp nil
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146 "Regexp for beginning of block. Buffer-local.")
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147
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148 (defvar hs-block-end-regexp nil
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149 "Regexp for end of block. Buffer-local.")
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150
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151 (defvar hs-forward-sexp-func 'forward-sexp
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152 "Function used to do a forward-sexp. Should change for Algol-ish modes.
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153 For single-character block delimiters -- ie, the syntax table regexp for the
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154 character is either `(' or `)' -- `hs-forward-sexp-func' would just be
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155 `forward-sexp'. For other modes such as simula, a more specialized function
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156 is necessary.")
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157
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158 (defvar hs-emacs-type 'fsf
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159 "Used to support both FSF Emacs and Xemacs.")
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160
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161 (eval-when-compile
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162 (if (string-match "xemacs\\|lucid" emacs-version)
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163 (progn
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164 (defvar current-menubar nil "")
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165 (defun set-buffer-menubar (arg1))
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166 (defun add-menu (arg1 arg2 arg3)))))
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167
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168
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169 ;;;----------------------------------------------------------------------------
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170 ;;; support funcs
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171
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172 ;; snarfed from outline.el, but added buffer-read-only
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173 (defun hs-flag-region (from to flag)
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174 "Hides or shows lines from FROM to TO, according to FLAG.
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175 If FLAG is \\n (newline character) then text is shown, while if FLAG
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176 is \\^M \(control-M) the text is hidden."
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177 (let ((modp (buffer-modified-p))
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178 buffer-read-only) ; nothing is immune
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179 (unwind-protect (progn
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180 (subst-char-in-region
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181 from to
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182 (if (= flag ?\n) ?\C-m ?\n)
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183 flag t))
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184 (set-buffer-modified-p modp))))
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185
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186 (defun hs-hide-block-at-point (&optional end)
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187 "Hide block iff on block beginning, optional END means reposition at end."
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188 (if (looking-at hs-block-start-regexp)
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189 (let* ((p (point))
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190 (q (progn (funcall hs-forward-sexp-func 1) (point))))
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191 (forward-line -1) (end-of-line)
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192 (if (and (< p (point)) (> (count-lines p q) 1))
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193 (hs-flag-region p (point) ?\C-m))
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194 (goto-char (if end q p)))))
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195
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196 (defun hs-show-block-at-point (&optional end)
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197 "Show block iff on block beginning. Optional END means reposition at end."
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198 (if (looking-at hs-block-start-regexp)
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199 (let* ((p (point))
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200 (q
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201 (condition-case error ; probably unbalanced paren
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202 (progn
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203 (funcall hs-forward-sexp-func 1)
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204 (point))
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205 (error
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206 (cond
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207 ((eq hs-unbalance-handler-method 'ignore)
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208 ;; just ignore this block
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209 (point))
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210 ((eq hs-unbalance-handler-method 'top-level)
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211 ;; try to get out of rat's nest and expose the whole func
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212 (if (/= (current-column) 0) (beginning-of-defun))
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213 (setq p (point))
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214 (re-search-forward (concat "^" hs-block-start-regexp)
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215 (point-max) t 2)
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216 (point))
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217 ((eq hs-unbalance-handler-method 'next-line)
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218 ;; assumption is that user knows what s/he's doing
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219 (beginning-of-line) (setq p (point))
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220 (end-of-line 2) (point))
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221 (t
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222 ;; pass error through -- this applies to `signal', too
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223 (signal (car error) (cdr error))))))))
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224 (hs-flag-region p q ?\n)
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225 (goto-char (if end (1+ (point)) p)))))
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226
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227 (defun hs-safety-is-job-n ()
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228 "Warns if selective-display or selective-display-ellipses is nil."
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229 (let ((str ""))
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230 (or selective-display
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231 (setq str "selective-display nil "))
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232 (or selective-display-ellipses
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233 (setq str (concat str "selective-display-ellipses nil")))
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234 (if (= (length str) 0)
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235 nil
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236 (message "warning: %s" str)
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237 (sit-for 2))))
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238
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239 (defun hs-inside-comment-p ()
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240 "Returns non-nil if point is inside a comment, otherwise nil.
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241 Actually, for multi-line-able comments, returns a list containing
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242 the buffer position of the start and the end of the comment."
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243 ;; is it single-line-only or multi-line-able?
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244 (save-excursion
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245 (let ((p (point))
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246 q)
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247 (if (string= comment-end "") ; single line
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248 (let (found)
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249 (beginning-of-line)
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250 (setq found (re-search-forward hs-c-start-regexp p t))
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251 (and found (not (search-forward "\"" p t))))
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252 (re-search-forward hs-c-end-regexp (point-max) 1)
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253 (setq q (point))
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254 (forward-comment -1)
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255 (re-search-forward hs-c-start-regexp (point-max) 1)
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256 (if (< (- (point) (length comment-start)) p)
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257 (list (match-beginning 0) q))))))
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258
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259 (defun hs-grok-mode-type ()
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260 "Setup variables for new buffers where applicable."
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261 (if (and (boundp 'comment-start)
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262 (boundp 'comment-end))
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263 (progn
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264 (setq hs-c-start-regexp (regexp-quote comment-start))
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265 (if (string-match " +$" hs-c-start-regexp)
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266 (setq hs-c-start-regexp
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267 (substring hs-c-start-regexp 0 (1- (match-end 0)))))
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268 (setq hs-c-end-regexp (if (string= "" comment-end) "\n"
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269 (regexp-quote comment-end)))
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270 (if (string-match "^ +" hs-c-end-regexp)
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271 (setq hs-c-end-regexp
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272 (substring hs-c-end-regexp (match-end 0))))
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273 (let ((lookup (assoc major-mode hs-special-modes-alist)))
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274 (setq hs-block-start-regexp (or (nth 1 lookup) "\\s\(")
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275 hs-block-end-regexp (or (nth 2 lookup) "\\s\)")
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276 hs-forward-sexp-func (or (nth 3 lookup) 'forward-sexp))))))
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277
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278 (defun hs-find-block-beginning ()
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279 "Repositions point at block-start. Return point, or nil if top-level."
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280 (let (done
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281 (here (point))
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282 (both-regexps (concat "\\(" hs-block-start-regexp "\\)\\|\\("
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283 hs-block-end-regexp "\\)")))
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284 (while (and (not done)
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285 (re-search-backward both-regexps (point-min) t))
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286 (if (match-beginning 1) ; start of start-regexp
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287 (setq done (match-beginning 1))
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288 (goto-char (match-end 2)) ; end of end-regexp
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289 (funcall hs-forward-sexp-func -1)))
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290 (goto-char (or done here))
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291 done))
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292
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293 (defmacro hs-life-goes-on (&rest body)
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294 "Executes optional BODY iff variable `hs-minor-mode' is non-nil."
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295 (list 'if 'hs-minor-mode (cons 'progn body)))
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296
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297
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298 ;;;----------------------------------------------------------------------------
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299 ;;; commands
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300
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301 ;;;###autoload
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302 (defun hs-hide-all ()
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303 "Hides all top-level blocks, displaying only first and last lines.
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304 When done, point is repositioned at the beginning of the line, and
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305 hs-hide-hooks is called. See documentation for `run-hooks'."
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306 (interactive)
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307 (hs-life-goes-on
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308 (message "hiding all blocks ...")
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309 (save-excursion
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310 (hs-flag-region (point-min) (point-max) ?\n) ; eliminate weirdness
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311 (goto-char (point-min))
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312 (let ((count 0)
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313 (top-level-re (concat "^" hs-block-start-regexp)))
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314 (while (progn
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315 (forward-comment (buffer-size))
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316 (re-search-forward top-level-re (point-max) t))
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317 (goto-char (match-beginning 0))
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318 (hs-hide-block-at-point t)
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319 (message "hiding ... %d" (setq count (1+ count)))))
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320 (hs-safety-is-job-n))
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321 (beginning-of-line)
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322 (message "hiding all blocks ... done")
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323 (run-hooks 'hs-hide-hooks)))
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324
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325 (defun hs-show-all ()
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326 "Shows all top-level blocks.
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327 When done, point is unchanged, and hs-show-hooks is called. See
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328 documentation for `run-hooks'."
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329 (interactive)
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330 (hs-life-goes-on
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331 (message "showing all blocks ...")
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332 (hs-flag-region (point-min) (point-max) ?\n)
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333 (message "showing all blocks ... done")
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334 (run-hooks 'hs-show-hooks)))
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335
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336 ;;;###autoload
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337 (defun hs-hide-block (&optional end)
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338 "Selects a block and hides it. With prefix arg, reposition at end.
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339 Block is defined as a sexp for lispish modes, mode-specific otherwise.
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340 Comments are blocks, too. Upon completion, point is at repositioned and
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341 hs-hide-hooks is called. See documentation for `run-hooks'."
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342 (interactive "P")
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343 (hs-life-goes-on
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344 (let ((c-reg (hs-inside-comment-p)))
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345 (if c-reg
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346 (cond ((string= comment-end "")
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347 (message "can't hide a single-line comment"))
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348 ((< (count-lines (car c-reg) (nth 1 c-reg)) 2)
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349 (message "not enougn comment lines to hide"))
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350 (t
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351 (goto-char (nth 1 c-reg))
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352 (forward-line -1)
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353 (hs-flag-region (car c-reg) (point) ?\C-m)
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354 (goto-char (if end (nth 1 c-reg) (car c-reg)))
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355 (hs-safety-is-job-n)
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356 (run-hooks 'hs-hide-hooks)))
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357 (if (or (looking-at hs-block-start-regexp)
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358 (hs-find-block-beginning))
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359 (progn
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360 (hs-hide-block-at-point end)
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361 (hs-safety-is-job-n)
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362 (run-hooks 'hs-hide-hooks)))))))
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363
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364 (defun hs-show-block (&optional end)
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365 "Selects a block and shows it. With prefix arg, reposition at end.
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366 Upon completion, point is repositioned hs-show-hooks are called. See
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367 documetation for `hs-hide-block' and `run-hooks'."
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368 (interactive "P")
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369 (hs-life-goes-on
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370 (let ((c-reg (hs-inside-comment-p)))
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371 (if c-reg
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372 (cond ((string= comment-end "")
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373 (message "already looking at the entire comment"))
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374 (t
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375 (hs-flag-region (car c-reg) (nth 1 c-reg) ?\n)
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376 (goto-char (if end (nth 1 c-reg) (car c-reg)))))
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377 (if (or (looking-at hs-block-start-regexp)
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378 (hs-find-block-beginning))
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379 (progn
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380 (hs-show-block-at-point end)
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381 (hs-safety-is-job-n)
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382 (run-hooks 'hs-show-hooks)))))))
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383
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384 (defun hs-show-region (beg end)
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385 "Shows all lines from BEG to END, without doing any block analysis.
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386 Note: hs-show-region is intended for use when when hs-show-block signals
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387 `unbalanced parentheses' and so is an emergency measure only. You may
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388 become very confused if you use this command indiscriminately."
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389 (interactive "r")
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390 (hs-life-goes-on
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391 (hs-flag-region beg end ?\n)
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392 (hs-safety-is-job-n)
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393 (run-hooks 'hs-show-hooks)))
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394
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395 ;;;###autoload
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396 (defun hs-minor-mode (&optional arg)
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397 "Toggle hideshow minor mode.
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398 With ARG, turn hideshow minor mode on if ARG is positive, off otherwise.
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399 When hideshow minor mode is on, the menu bar is augmented with hideshow
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400 commands and the hideshow commands are enabled. The variables\n
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401 \tselective-display\n\tselective-display-ellipses\n
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402 are set to t. Lastly, the hooks set in hs-minor-mode-hook are called.
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403 See documentation for `run-hooks'.\n
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404 Turning hideshow minor mode off reverts the menu bar and the
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405 variables to default values and disables the hideshow commands."
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406 (interactive "P")
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407 (setq hs-minor-mode
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408 (if (null arg)
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409 (not hs-minor-mode)
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410 (> (prefix-numeric-value arg) 0)))
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411 (if hs-minor-mode
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412 (progn
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413 (if (eq hs-emacs-type 'lucid)
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414 (progn
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415 (set-buffer-menubar (copy-sequence current-menubar))
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416 (add-menu nil (car hs-menu-bar) (cdr hs-menu-bar))))
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417 (setq selective-display t
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418 selective-display-ellipses t)
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419 (hs-grok-mode-type)
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420 (run-hooks 'hs-minor-mode-hook))
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421 (if (eq hs-emacs-type 'lucid)
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422 (set-buffer-menubar (delete hs-menu-bar current-menubar)))
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423 (kill-local-variable 'selective-display)
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424 (kill-local-variable 'selective-display-ellipses)))
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425
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426
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427 ;;;----------------------------------------------------------------------------
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428 ;;; load-time setup routines
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429
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430 ;; which emacs being used?
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431 (setq hs-emacs-type
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432 (if (string-match "XEmacs\\|Lucid" emacs-version)
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433 'lucid
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434 'fsf))
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435
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436 ;; keymaps and menus
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437 (if (not hs-minor-mode-map)
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438 (setq hs-minor-mode-map (make-sparse-keymap))
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439 ;; XEmacs: need this for the change in add-minor-mode
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440 (fset 'hs-minor-mode-map hs-minor-mode-map)
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441 (cond
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442 ((eq hs-emacs-type 'lucid)
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443 (setq hs-menu-bar ; build top down for lucid
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444 '("hideshow"
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445 ["Hide Block" hs-hide-block t]
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446 ["Show Block" hs-show-block t]
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447 ["Hide All" hs-hide-all t]
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448 ["Show All" hs-show-all t]
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449 ["Show Region" hs-show-region t])))
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450 (t ; build bottom up for others
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451 (define-key hs-minor-mode-map [menu-bar hideshow]
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452 (cons "hideshow" (make-sparse-keymap "hideshow")))
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453 (define-key hs-minor-mode-map [menu-bar hideshow hs-show-region]
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454 '("Show Region" . hs-show-region))
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455 (define-key hs-minor-mode-map [menu-bar hideshow hs-show-all]
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456 '("Show All" . hs-show-all))
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457 (define-key hs-minor-mode-map [menu-bar hideshow hs-hide-all]
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458 '("Hide All" . hs-hide-all))
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459 (define-key hs-minor-mode-map [menu-bar hideshow hs-show-block]
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460 '("Show Block" . hs-show-block))
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461 (define-key hs-minor-mode-map [menu-bar hideshow hs-hide-block]
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462 '("Hide Block" . hs-hide-block)))))
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463
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464 ;; some housekeeping
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465 ;(or (assq 'hs-minor-mode minor-mode-map-alist)
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466 ; (setq minor-mode-map-alist
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467 ; (cons (cons 'hs-minor-mode hs-minor-mode-map)
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468 ; minor-mode-map-alist)))
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469 ;(or (assq 'hs-minor-mode minor-mode-alist)
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470 ; (setq minor-mode-alist (append minor-mode-alist
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471 ; (list '(hs-minor-mode " hs")))))
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472 ;; XEmacs: do it right.
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473 ;;;###autoload
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474 (add-minor-mode 'hs-minor-mode " hs" 'hs-minor-mode-map)
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475
|
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476 ;; make some variables buffer-local
|
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477 (make-variable-buffer-local 'hs-minor-mode)
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|
478 (make-variable-buffer-local 'hs-c-start-regexp)
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|
479 (make-variable-buffer-local 'hs-c-end-regexp)
|
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480 (make-variable-buffer-local 'hs-block-start-regexp)
|
|
481 (make-variable-buffer-local 'hs-block-end-regexp)
|
|
482 (make-variable-buffer-local 'hs-forward-sexp-func)
|
|
483 (put 'hs-minor-mode 'permanent-local t)
|
|
484 (put 'hs-c-start-regexp 'permanent-local t)
|
|
485 (put 'hs-c-end-regexp 'permanent-local t)
|
|
486 (put 'hs-block-start-regexp 'permanent-local t)
|
|
487 (put 'hs-block-end-regexp 'permanent-local t)
|
|
488 (put 'hs-forward-sexp-func 'permanent-local t)
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|
489
|
|
490
|
|
491 ;;;----------------------------------------------------------------------------
|
|
492 ;;; that's it
|
|
493
|
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494 (provide 'hideshow)
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495
|
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496 ;;; hideshow.el ends here
|