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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) 1994,1995,1996 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 XEmacs.
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11
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12 ;; XEmacs 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
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14 ;; the Free Software Foundation; either version 2 of the License, or
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15 ;; (at your option) any later version.
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16
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17 ;; XEmacs is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 ;; General Public License 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
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23 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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24 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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25 ;; 02111-1307, USA.
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26
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27 ;;; Synched up with: FSF 19.34.
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28
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29 ;; LCD Archive Entry:
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30 ;; hideshow|Thien-Thi Nguyen|ttn@netcom.com|
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31 ;; minor mode commands to selectively display blocks of code|
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32 ;; 18-Oct-1994|3.4|~/modes/hideshow.el.Z|
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33
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34 ;;; Commentary:
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35
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36 ;; This file provides `hs-minor-mode'. When active, six commands:
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37 ;; hs-{hide,show}-{all,block}, hs-show-region and hs-minor-mode
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38 ;; are available. They implement block hiding and showing. Blocks are
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39 ;; defined in mode-specific way. In c-mode or c++-mode, they are simply
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40 ;; curly braces, while in lisp-ish modes they are parens. Multi-line
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41 ;; comments (c-mode) can also be hidden. The command M-x hs-minor-mode
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42 ;; toggles the minor mode or sets it (similar to outline minor mode).
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43 ;; See documentation for each command for more info.
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44 ;;
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45 ;; The variable `hs-unbalance-handler-method' controls hideshow's behavior
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46 ;; in the case of "unbalanced parentheses". See doc for more info.
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47
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48 ;; Suggested usage:
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49
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50 ;; (load-library "hideshow")
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51 ;; (defun my-hs-setup () "enables hideshow and binds some commands"
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52 ;; (hs-minor-mode 1)
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53 ;; (define-key hs-minor-mode-map "\C-ch" 'hs-hide-block)
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54 ;; (define-key hs-minor-mode-map "\C-cs" 'hs-show-block)
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55 ;; (define-key hs-minro-mode-map "\C-cH" 'hs-hide-all)
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56 ;; (define-key hs-minro-mode-map "\C-cS" 'hs-show-all)
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57 ;; (define-key hs-minor-mode-map "\C-cR" 'hs-show-region))
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58 ;; (add-hook 'X-mode-hook 'my-hs-setup t) ; other modes similarly
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59 ;;
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60 ;; where X = {emacs-lisp,c,c++,perl,...}. See the doc for the variable
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61 ;; `hs-special-modes-alist' if you'd like to use hideshow w/ other modes.
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62
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63 ;; Etc:
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64
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65 ;; Bug reports and fixes welcome (comments, too). Thanks go to
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66 ;; Dean Andrews <adahome@ix.netcom.com>
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67 ;; Preston F. Crow <preston.f.crow@dartmouth.edu>
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68 ;; Gael Marziou <gael@gnlab030.grenoble.hp.com>
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69 ;; Keith Sheffield <sheff@edcsgw2.cr.usgs.gov>
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70 ;; Jan Djarv <jan.djarv@sa.erisoft.se>
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71 ;; Lars Lindberg <qhslali@aom.ericsson.se>
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72 ;; Alf-Ivar Holm <alfh@ifi.uio.no>
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73 ;; for valuable feedback, code and bug reports.
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74
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75 ;;; Code:
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76
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77
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78 ;;;----------------------------------------------------------------------------
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79 ;;; user-configurable variables
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80
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81 (defvar hs-unbalance-handler-method 'top-level
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82 "*Symbol representing how \"unbalanced parentheses\" should be handled.
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83 This error is usually signaled by `hs-show-block'. One of four values:
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84 `top-level', `next-line', `signal' or `ignore'. Default is `top-level'.
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85
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86 - `top-level' -- Show top-level block containing the currently troublesome
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87 block.
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88 - `next-line' -- Use the fact that, for an already hidden block, its end
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89 will be on the next line. Attempt to show this block.
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90 - `signal' -- Pass the error through, stopping execution.
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91 - `ignore' -- Ignore the error, continuing execution.
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92
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93 Values other than these four will be interpreted as `signal'.")
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94
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95 (defvar hs-special-modes-alist '((c-mode "{" "}")
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96 (c++-mode "{" "}"))
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97 "*Alist of the form (MODE START-RE END-RE FORWARD-SEXP-FUNC).
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98 If present, hideshow will use these values for the start and end regexps,
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99 respectively. Since Algol-ish languages do not have single-character
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100 block delimiters, the function `forward-sexp' which is used by hideshow
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101 doesn't work. In this case, if a similar function is provided, you can
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102 register it and have hideshow use it instead of `forward-sexp'. To add
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103 more values, use
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104
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105 \t(pushnew '(new-mode st-re end-re function-name)
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106 \t hs-special-modes-alist :test 'equal)
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107
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108 For example:
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109
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110 \t(pushnew '(simula-mode \"begin\" \"end\" simula-next-statement)
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111 \t hs-special-modes-alist :test 'equal)
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112
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113 Note that the regexps should not contain leading or trailing whitespace.")
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114
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115 (defvar hs-hide-hook nil
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116 "*Hooks called at the end of `hs-hide-all' and `hs-hide-block'.")
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117
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118 (defvar hs-show-hook nil
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119 "*Hooks called at the end of commands to show text.
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120 These commands include `hs-show-all', `hs-show-block' and `hs-show-region'.")
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121
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122 (defvar hs-minor-mode-prefix "\C-c"
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123 "*Prefix key to use for hideshow commands in hideshow minor mode.")
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124
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125
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126 ;;;----------------------------------------------------------------------------
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127 ;;; internal variables
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128
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129 ;;;###autoload
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130 (defvar hs-minor-mode nil
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131 "Non-nil if using hideshow mode as a minor mode of some other mode.
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132 Use the command `hs-minor-mode' to toggle this variable.")
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133
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134 (defvar hs-minor-mode-map nil
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135 "Mode map for hideshow minor mode.")
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136
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137 (defvar hs-menu-bar nil
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138 "Menu bar for hideshow minor mode (Xemacs only).")
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139
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140 (defvar hs-c-start-regexp nil
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141 "Regexp for beginning of comments. Buffer-local.
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142 Differs from mode-specific comment regexps in that surrounding
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143 whitespace is stripped.")
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144
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145 (defvar hs-c-end-regexp nil
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146 "Regexp for end of comments. Buffer-local.
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147 See `hs-c-start-regexp'.")
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148
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149 (defvar hs-block-start-regexp nil
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150 "Regexp for beginning of block. Buffer-local.")
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151
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152 (defvar hs-block-end-regexp nil
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153 "Regexp for end of block. Buffer-local.")
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154
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155 (defvar hs-forward-sexp-func 'forward-sexp
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156 "Function used to do a forward-sexp. Should change for Algol-ish modes.
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157 For single-character block delimiters -- ie, the syntax table regexp for the
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158 character is either `(' or `)' -- `hs-forward-sexp-func' would just be
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159 `forward-sexp'. For other modes such as simula, a more specialized function
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160 is necessary.")
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161
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162 (defvar hs-emacs-type 'fsf
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163 "Used to support both FSF Emacs and Xemacs.")
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164
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165 (eval-when-compile
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166 (if (string-match "xemacs\\|lucid" emacs-version)
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167 (progn
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168 (defvar current-menubar nil "")
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169 (defun set-buffer-menubar (arg1))
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170 (defun add-menu (arg1 arg2 arg3)))))
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171
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172
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173 ;;;----------------------------------------------------------------------------
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174 ;;; support funcs
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175
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176 ;; snarfed from outline.el, but added buffer-read-only
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177 (defun hs-flag-region (from to flag)
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178 "Hides or shows lines from FROM to TO, according to FLAG.
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179 If FLAG is `?\\n' (the newline character) then show the text;
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180 if FLAG is `?\\^M' \(control-M) then hide the text."
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181 (let ((modp (buffer-modified-p))
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182 buffer-read-only) ; nothing is immune
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183 (unwind-protect (progn
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184 (subst-char-in-region
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185 from to
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186 (if (= flag ?\n) ?\C-m ?\n)
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187 flag t))
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188 (set-buffer-modified-p modp))))
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189
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190 (defun hs-hide-block-at-point (&optional end)
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191 "Hide block iff on block beginning, optional END means reposition at end."
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192 (if (looking-at hs-block-start-regexp)
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193 (let* ((p (point))
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194 (q (progn (funcall hs-forward-sexp-func 1) (point))))
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195 (forward-line -1) (end-of-line)
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196 (if (and (< p (point)) (> (count-lines p q) 1))
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197 (hs-flag-region p (point) ?\C-m))
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198 (goto-char (if end q p)))))
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199
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200 (defun hs-show-block-at-point (&optional end)
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201 "Show block iff on block beginning. Optional END means reposition at end."
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202 (if (looking-at hs-block-start-regexp)
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203 (let* ((p (point))
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204 (q
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205 (condition-case error ; probably unbalanced paren
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206 (progn
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207 (funcall hs-forward-sexp-func 1)
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208 (point))
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209 (error
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210 (cond
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211 ((eq hs-unbalance-handler-method 'ignore)
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212 ;; just ignore this block
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213 (point))
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214 ((eq hs-unbalance-handler-method 'top-level)
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215 ;; try to get out of rat's nest and expose the whole func
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216 (if (/= (current-column) 0) (beginning-of-defun))
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217 (setq p (point))
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218 (re-search-forward (concat "^" hs-block-start-regexp)
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219 (point-max) t 2)
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220 (point))
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221 ((eq hs-unbalance-handler-method 'next-line)
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222 ;; assumption is that user knows what s/he's doing
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223 (beginning-of-line) (setq p (point))
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224 (end-of-line 2) (point))
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225 (t
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226 ;; pass error through -- this applies to `signal', too
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227 (signal (car error) (cdr error))))))))
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228 (hs-flag-region p q ?\n)
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229 (goto-char (if end (1+ (point)) p)))))
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230
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231 (defun hs-safety-is-job-n ()
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232 "Warn if `selective-display' or `selective-display-ellipses' is nil."
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233 (let ((str ""))
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234 (or selective-display
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235 (setq str "selective-display nil "))
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236 (or selective-display-ellipses
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237 (setq str (concat str "selective-display-ellipses nil")))
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238 (if (= (length str) 0)
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239 nil
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240 (message "warning: %s" str)
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241 (sit-for 2))))
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242
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243 (defun hs-inside-comment-p ()
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244 "Returns non-nil if point is inside a comment, otherwise nil.
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245 Actually, for multi-line-able comments, returns a list containing
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246 the buffer position of the start and the end of the comment."
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247 ;; is it single-line-only or multi-line-able?
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248 (save-excursion
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249 (let ((p (point))
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250 q)
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251 (if (string= comment-end "") ; single line
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252 (let (found)
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253 (beginning-of-line)
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254 (setq found (re-search-forward hs-c-start-regexp p t))
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255 (and found (not (search-forward "\"" p t))))
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256 (re-search-forward hs-c-end-regexp (point-max) 1)
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257 (setq q (point))
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258 (forward-comment -1)
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259 (re-search-forward hs-c-start-regexp (point-max) 1)
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260 (if (< (- (point) (length comment-start)) p)
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261 (list (match-beginning 0) q))))))
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262
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263 (defun hs-grok-mode-type ()
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264 "Setup variables for new buffers where applicable."
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265 (if (and (boundp 'comment-start)
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266 (boundp 'comment-end))
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267 (progn
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268 (setq hs-c-start-regexp (regexp-quote comment-start))
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269 (if (string-match " +$" hs-c-start-regexp)
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270 (setq hs-c-start-regexp
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271 (substring hs-c-start-regexp 0 (1- (match-end 0)))))
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272 (setq hs-c-end-regexp (if (string= "" comment-end) "\n"
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273 (regexp-quote comment-end)))
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274 (if (string-match "^ +" hs-c-end-regexp)
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275 (setq hs-c-end-regexp
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276 (substring hs-c-end-regexp (match-end 0))))
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277 (let ((lookup (assoc major-mode hs-special-modes-alist)))
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278 (setq hs-block-start-regexp (or (nth 1 lookup) "\\s\(")
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279 hs-block-end-regexp (or (nth 2 lookup) "\\s\)")
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280 hs-forward-sexp-func (or (nth 3 lookup) 'forward-sexp))))))
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281
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282 (defun hs-find-block-beginning ()
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283 "Repositions point at block-start. Return point, or nil if top-level."
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284 (let (done
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285 (here (point))
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286 (both-regexps (concat "\\(" hs-block-start-regexp "\\)\\|\\("
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287 hs-block-end-regexp "\\)")))
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288 (while (and (not done)
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289 (re-search-backward both-regexps (point-min) t))
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290 (if (match-beginning 1) ; start of start-regexp
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291 (setq done (match-beginning 1))
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292 (goto-char (match-end 2)) ; end of end-regexp
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293 (funcall hs-forward-sexp-func -1)))
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294 (goto-char (or done here))
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295 done))
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296
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297 (defmacro hs-life-goes-on (&rest body)
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298 "Executes optional BODY iff variable `hs-minor-mode' is non-nil."
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299 (list 'if 'hs-minor-mode (cons 'progn body)))
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300
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301
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302 ;;;----------------------------------------------------------------------------
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303 ;;; commands
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304
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305 ;;;###autoload
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306 (defun hs-hide-all ()
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307 "Hides all top-level blocks, displaying only first and last lines.
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308 It moves point to the beginning of the line, and it runs the normal hook
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309 `hs-hide-hook'. See documentation for `run-hooks'."
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310 (interactive)
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311 (hs-life-goes-on
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312 (message "hiding all blocks ...")
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313 (save-excursion
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314 (hs-flag-region (point-min) (point-max) ?\n) ; eliminate weirdness
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315 (goto-char (point-min))
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316 (let ((count 0)
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317 (top-level-re (concat "^" hs-block-start-regexp)))
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318 (while (progn
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319 (forward-comment (buffer-size))
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320 (re-search-forward top-level-re (point-max) t))
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321 (goto-char (match-beginning 0))
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322 (hs-hide-block-at-point t)
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323 (message "hiding ... %d" (setq count (1+ count)))))
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324 (hs-safety-is-job-n))
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325 (beginning-of-line)
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326 (message "hiding all blocks ... done")
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327 (run-hooks 'hs-hide-hook)))
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328
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329 (defun hs-show-all ()
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330 "Shows all top-level blocks.
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331 This does not change point; it runs the normal hook `hs-show-hook'.
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332 See documentation for `run-hooks'."
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333 (interactive)
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334 (hs-life-goes-on
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335 (message "showing all blocks ...")
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336 (hs-flag-region (point-min) (point-max) ?\n)
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337 (message "showing all blocks ... done")
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2
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338 (run-hooks 'hs-show-hook)))
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339
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340 ;;;###autoload
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341 (defun hs-hide-block (&optional end)
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342 "Selects a block and hides it. With prefix arg, reposition at end.
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343 Block is defined as a sexp for lispish modes, mode-specific otherwise.
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344 Comments are blocks, too. Upon completion, point is at repositioned and
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2
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345 the normal hook `hs-hide-hook' is run. See documentation for `run-hooks'."
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346 (interactive "P")
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347 (hs-life-goes-on
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348 (let ((c-reg (hs-inside-comment-p)))
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349 (if c-reg
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350 (cond ((string= comment-end "")
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351 (message "can't hide a single-line comment"))
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352 ((< (count-lines (car c-reg) (nth 1 c-reg)) 2)
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2
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353 (message "not enough comment lines to hide"))
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0
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354 (t
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355 (goto-char (nth 1 c-reg))
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356 (forward-line -1)
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357 (hs-flag-region (car c-reg) (point) ?\C-m)
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358 (goto-char (if end (nth 1 c-reg) (car c-reg)))
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359 (hs-safety-is-job-n)
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2
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360 (run-hooks 'hs-hide-hook)))
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0
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361 (if (or (looking-at hs-block-start-regexp)
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362 (hs-find-block-beginning))
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363 (progn
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364 (hs-hide-block-at-point end)
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365 (hs-safety-is-job-n)
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2
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366 (run-hooks 'hs-hide-hook)))))))
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0
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367
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368 (defun hs-show-block (&optional end)
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369 "Selects a block and shows it. With prefix arg, reposition at end.
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2
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370 Upon completion, point is repositioned and the normal hook
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371 `hs-show-hook' is run. See documentation for `hs-hide-block' and `run-hooks'."
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0
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372 (interactive "P")
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373 (hs-life-goes-on
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374 (let ((c-reg (hs-inside-comment-p)))
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375 (if c-reg
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376 (cond ((string= comment-end "")
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377 (message "already looking at the entire comment"))
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378 (t
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379 (hs-flag-region (car c-reg) (nth 1 c-reg) ?\n)
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380 (goto-char (if end (nth 1 c-reg) (car c-reg)))))
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381 (if (or (looking-at hs-block-start-regexp)
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382 (hs-find-block-beginning))
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383 (progn
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384 (hs-show-block-at-point end)
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385 (hs-safety-is-job-n)
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2
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386 (run-hooks 'hs-show-hook)))))))
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0
|
387
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|
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388 (defun hs-show-region (beg end)
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389 "Shows all lines from BEG to END, without doing any block analysis.
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2
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390 Note:` hs-show-region' is intended for use when when `hs-show-block' signals
|
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0
|
391 `unbalanced parentheses' and so is an emergency measure only. You may
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|
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392 become very confused if you use this command indiscriminately."
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393 (interactive "r")
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394 (hs-life-goes-on
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395 (hs-flag-region beg end ?\n)
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396 (hs-safety-is-job-n)
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2
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397 (run-hooks 'hs-show-hook)))
|
|
0
|
398
|
|
|
399 ;;;###autoload
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|
|
400 (defun hs-minor-mode (&optional arg)
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|
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401 "Toggle hideshow minor mode.
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|
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402 With ARG, turn hideshow minor mode on if ARG is positive, off otherwise.
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|
|
403 When hideshow minor mode is on, the menu bar is augmented with hideshow
|
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2
|
404 commands and the hideshow commands are enabled. The variables
|
|
|
405 `selective-display' and `selective-display-ellipses' are set to t.
|
|
|
406 Last, the normal hook `hs-minor-mode-hook' is run; see the doc for `run-hooks'.
|
|
|
407
|
|
0
|
408 Turning hideshow minor mode off reverts the menu bar and the
|
|
|
409 variables to default values and disables the hideshow commands."
|
|
|
410 (interactive "P")
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|
|
411 (setq hs-minor-mode
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|
|
412 (if (null arg)
|
|
|
413 (not hs-minor-mode)
|
|
|
414 (> (prefix-numeric-value arg) 0)))
|
|
|
415 (if hs-minor-mode
|
|
|
416 (progn
|
|
|
417 (if (eq hs-emacs-type 'lucid)
|
|
|
418 (progn
|
|
|
419 (set-buffer-menubar (copy-sequence current-menubar))
|
|
|
420 (add-menu nil (car hs-menu-bar) (cdr hs-menu-bar))))
|
|
|
421 (setq selective-display t
|
|
|
422 selective-display-ellipses t)
|
|
|
423 (hs-grok-mode-type)
|
|
|
424 (run-hooks 'hs-minor-mode-hook))
|
|
|
425 (if (eq hs-emacs-type 'lucid)
|
|
|
426 (set-buffer-menubar (delete hs-menu-bar current-menubar)))
|
|
|
427 (kill-local-variable 'selective-display)
|
|
|
428 (kill-local-variable 'selective-display-ellipses)))
|
|
|
429
|
|
|
430
|
|
|
431 ;;;----------------------------------------------------------------------------
|
|
|
432 ;;; load-time setup routines
|
|
|
433
|
|
|
434 ;; which emacs being used?
|
|
|
435 (setq hs-emacs-type
|
|
|
436 (if (string-match "XEmacs\\|Lucid" emacs-version)
|
|
|
437 'lucid
|
|
|
438 'fsf))
|
|
|
439
|
|
|
440 ;; keymaps and menus
|
|
|
441 (if (not hs-minor-mode-map)
|
|
|
442 (setq hs-minor-mode-map (make-sparse-keymap))
|
|
|
443 ;; XEmacs: need this for the change in add-minor-mode
|
|
|
444 (fset 'hs-minor-mode-map hs-minor-mode-map)
|
|
|
445 (cond
|
|
|
446 ((eq hs-emacs-type 'lucid)
|
|
|
447 (setq hs-menu-bar ; build top down for lucid
|
|
|
448 '("hideshow"
|
|
|
449 ["Hide Block" hs-hide-block t]
|
|
|
450 ["Show Block" hs-show-block t]
|
|
|
451 ["Hide All" hs-hide-all t]
|
|
|
452 ["Show All" hs-show-all t]
|
|
|
453 ["Show Region" hs-show-region t])))
|
|
|
454 (t ; build bottom up for others
|
|
|
455 (define-key hs-minor-mode-map [menu-bar hideshow]
|
|
|
456 (cons "hideshow" (make-sparse-keymap "hideshow")))
|
|
|
457 (define-key hs-minor-mode-map [menu-bar hideshow hs-show-region]
|
|
|
458 '("Show Region" . hs-show-region))
|
|
|
459 (define-key hs-minor-mode-map [menu-bar hideshow hs-show-all]
|
|
|
460 '("Show All" . hs-show-all))
|
|
|
461 (define-key hs-minor-mode-map [menu-bar hideshow hs-hide-all]
|
|
|
462 '("Hide All" . hs-hide-all))
|
|
|
463 (define-key hs-minor-mode-map [menu-bar hideshow hs-show-block]
|
|
|
464 '("Show Block" . hs-show-block))
|
|
|
465 (define-key hs-minor-mode-map [menu-bar hideshow hs-hide-block]
|
|
|
466 '("Hide Block" . hs-hide-block)))))
|
|
|
467
|
|
|
468 ;; some housekeeping
|
|
|
469 ;(or (assq 'hs-minor-mode minor-mode-map-alist)
|
|
|
470 ; (setq minor-mode-map-alist
|
|
|
471 ; (cons (cons 'hs-minor-mode hs-minor-mode-map)
|
|
|
472 ; minor-mode-map-alist)))
|
|
|
473 ;(or (assq 'hs-minor-mode minor-mode-alist)
|
|
|
474 ; (setq minor-mode-alist (append minor-mode-alist
|
|
|
475 ; (list '(hs-minor-mode " hs")))))
|
|
|
476 ;; XEmacs: do it right.
|
|
|
477 ;;;###autoload
|
|
|
478 (add-minor-mode 'hs-minor-mode " hs" 'hs-minor-mode-map)
|
|
|
479
|
|
|
480 ;; make some variables buffer-local
|
|
|
481 (make-variable-buffer-local 'hs-minor-mode)
|
|
|
482 (make-variable-buffer-local 'hs-c-start-regexp)
|
|
|
483 (make-variable-buffer-local 'hs-c-end-regexp)
|
|
|
484 (make-variable-buffer-local 'hs-block-start-regexp)
|
|
|
485 (make-variable-buffer-local 'hs-block-end-regexp)
|
|
|
486 (make-variable-buffer-local 'hs-forward-sexp-func)
|
|
|
487 (put 'hs-minor-mode 'permanent-local t)
|
|
|
488 (put 'hs-c-start-regexp 'permanent-local t)
|
|
|
489 (put 'hs-c-end-regexp 'permanent-local t)
|
|
|
490 (put 'hs-block-start-regexp 'permanent-local t)
|
|
|
491 (put 'hs-block-end-regexp 'permanent-local t)
|
|
|
492 (put 'hs-forward-sexp-func 'permanent-local t)
|
|
|
493
|
|
|
494
|
|
|
495 ;;;----------------------------------------------------------------------------
|
|
|
496 ;;; that's it
|
|
|
497
|
|
|
498 (provide 'hideshow)
|
|
|
499
|
|
|
500 ;;; hideshow.el ends here
|
