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428
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1 ;;; help.el --- help commands for XEmacs.
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2
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3 ;; Copyright (C) 1985, 1986, 1992-4, 1997 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: FSF
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6 ;; Keywords: help, internal, dumped
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the
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22 ;; Free Software Foundation, 59 Temple Place - Suite 330,
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23 ;; Boston, MA 02111-1307, USA.
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24
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25 ;;; Synched up with: FSF 19.30.
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26
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27 ;;; Commentary:
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28
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29 ;; This file is dumped with XEmacs.
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30
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31 ;; This code implements XEmacs's on-line help system, the one invoked by
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32 ;;`M-x help-for-help'.
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33
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34 ;; 06/11/1997 -- Converted to use char-after instead of broken
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35 ;; following-char. -slb
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36
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37 ;;; Code:
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38
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39 ;; Get the macro make-help-screen when this is compiled,
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40 ;; or run interpreted, but not when the compiled code is loaded.
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41 (eval-when-compile (require 'help-macro))
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42
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43 (defgroup help nil
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44 "Support for on-line help systems."
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45 :group 'emacs)
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46
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47 (defgroup help-appearance nil
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48 "Appearance of help buffers."
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49 :group 'help)
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50
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51 (defvar help-map (let ((map (make-sparse-keymap)))
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52 (set-keymap-name map 'help-map)
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53 (set-keymap-prompt
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54 map (purecopy (gettext "(Type ? for further options)")))
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55 map)
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56 "Keymap for characters following the Help key.")
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57
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58 ;; global-map definitions moved to keydefs.el
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59 (fset 'help-command help-map)
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60
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61 (define-key help-map (vector help-char) 'help-for-help)
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62 (define-key help-map "?" 'help-for-help)
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63 (define-key help-map 'help 'help-for-help)
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64 (define-key help-map '(f1) 'help-for-help)
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65
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66 (define-key help-map "\C-l" 'describe-copying) ; on \C-c in FSFmacs
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67 (define-key help-map "\C-d" 'describe-distribution)
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68 (define-key help-map "\C-w" 'describe-no-warranty)
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69 (define-key help-map "a" 'hyper-apropos) ; 'command-apropos in FSFmacs
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70 (define-key help-map "A" 'command-apropos)
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71
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72 (define-key help-map "b" 'describe-bindings)
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73 (define-key help-map "B" 'describe-beta)
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74 (define-key help-map "\C-p" 'describe-pointer)
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75
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76 (define-key help-map "C" 'customize)
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77 (define-key help-map "c" 'describe-key-briefly)
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78 (define-key help-map "k" 'describe-key)
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79
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80 (define-key help-map "d" 'describe-function)
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81 (define-key help-map "e" 'describe-last-error)
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82 (define-key help-map "f" 'describe-function)
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83
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84 (define-key help-map "F" 'xemacs-local-faq)
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85
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86 (define-key help-map "i" 'info)
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87 (define-key help-map '(control i) 'Info-query)
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88 ;; FSFmacs has Info-goto-emacs-command-node on C-f, no binding
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89 ;; for Info-elisp-ref
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90 (define-key help-map '(control c) 'Info-goto-emacs-command-node)
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91 (define-key help-map '(control k) 'Info-goto-emacs-key-command-node)
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92 (define-key help-map '(control f) 'Info-elisp-ref)
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93
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94 (define-key help-map "l" 'view-lossage)
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95
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96 (define-key help-map "m" 'describe-mode)
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97
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98 (define-key help-map "\C-n" 'view-emacs-news)
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99 (define-key help-map "n" 'view-emacs-news)
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100
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101 (define-key help-map "p" 'finder-by-keyword)
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102
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103 ;; Do this right with an autoload cookie in finder.el.
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104 ;;(autoload 'finder-by-keyword "finder"
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105 ;; "Find packages matching a given keyword." t)
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106
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107 (define-key help-map "s" 'describe-syntax)
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108
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109 (define-key help-map "t" 'help-with-tutorial)
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110
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111 (define-key help-map "w" 'where-is)
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112
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113 (define-key help-map "v" 'describe-variable)
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114
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115 (if (fboundp 'view-last-error)
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116 (define-key help-map "e" 'view-last-error))
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117
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118
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119 (define-key help-map "q" 'help-quit)
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120
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121 ;#### This stuff was an attempt to have font locking and hyperlinks in the
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122 ;help buffer, but it doesn't really work. Some of this stuff comes from
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123 ;FSF Emacs; but the FSF Emacs implementation is rather broken, as usual.
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124 ;What needs to happen is this:
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125 ;
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126 ; -- we probably need a "hyperlink mode" from which help-mode is derived.
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127 ; -- this means we probably need multiple inheritance of modes!
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128 ; Thankfully this is not hard to implement; we already have the
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129 ; ability for a keymap to have multiple parents. However, we'd
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130 ; have to define any multiply-inherited-from modes using a standard
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131 ; `define-mode' construction instead of manually doing it, because
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132 ; we don't want each guy calling `kill-all-local-variables' and
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133 ; messing up the previous one.
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134 ; -- we need to scan the buffer ourselves (not from font-lock, because
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135 ; the user might not have font-lock enabled) and highlight only
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136 ; those words that are *documented* functions and variables (and
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137 ; probably excluding words without dashes in them unless enclosed
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138 ; in quotes, so that common words like "list" and "point" don't
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139 ; become hyperlinks.
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140 ; -- we should *not* use font-lock keywords like below. Instead we
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141 ; should add the font-lock stuff ourselves during the scanning phase,
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142 ; if font-lock is enabled in this buffer.
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143
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144 ;(defun help-follow-reference (event extent user-data)
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145 ; (let ((symbol (intern-soft (extent-string extent))))
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146 ; (cond ((and symbol (fboundp symbol))
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147 ; (describe-function symbol))
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148 ; ((and symbol (boundp symbol))
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149 ; (describe-variable symbol))
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150 ; (t nil))))
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151
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152 ;(defvar help-font-lock-keywords
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153 ; (let ((name-char "[-+a-zA-Z0-9_*]") (sym-char "[-+a-zA-Z0-9_:*]"))
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154 ; (list
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155 ; ;;
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156 ; ;; The symbol itself.
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157 ; (list (concat "\\`\\(" name-char "+\\)\\(:\\)?")
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158 ; '(1 (if (match-beginning 2)
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159 ; 'font-lock-function-name-face
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160 ; 'font-lock-variable-name-face)
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161 ; nil t))
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162 ; ;;
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163 ; ;; Words inside `' which tend to be symbol names.
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164 ; (list (concat "`\\(" sym-char sym-char "+\\)'")
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165 ; 1 '(prog1
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166 ; 'font-lock-reference-face
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167 ; (add-list-mode-item (match-beginning 1)
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168 ; (match-end 1)
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169 ; nil
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170 ; 'help-follow-reference))
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171 ; t)
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172 ; ;;
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173 ; ;; CLisp `:' keywords as references.
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174 ; (list (concat "\\<:" sym-char "+\\>") 0 'font-lock-reference-face t)))
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175 ; "Default expressions to highlight in Help mode.")
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176
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177 ;(put 'help-mode 'font-lock-defaults '(help-font-lock-keywords))
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178
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179 (define-derived-mode help-mode view-major-mode "Help"
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180 "Major mode for viewing help text.
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181 Entry to this mode runs the normal hook `help-mode-hook'.
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182 Commands:
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183 \\{help-mode-map}"
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184 )
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185
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186 (define-key help-mode-map "q" 'help-mode-quit)
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187 (define-key help-mode-map "Q" 'help-mode-bury)
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188 (define-key help-mode-map "f" 'find-function-at-point)
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189 (define-key help-mode-map "d" 'describe-function-at-point)
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190 (define-key help-mode-map "v" 'describe-variable-at-point)
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191 (define-key help-mode-map "i" 'Info-elisp-ref)
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192 (define-key help-mode-map "c" 'customize-variable)
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193 (define-key help-mode-map [tab] 'help-next-symbol)
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194 (define-key help-mode-map [(shift tab)] 'help-prev-symbol)
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195 (define-key help-mode-map "n" 'help-next-section)
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196 (define-key help-mode-map "p" 'help-prev-section)
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197
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198 (defun describe-function-at-point ()
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199 "Describe directly the function at point in the other window."
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200 (interactive)
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201 (let ((symb (function-at-point)))
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202 (when symb
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203 (describe-function symb))))
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204
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205 (defun describe-variable-at-point ()
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206 "Describe directly the variable at point in the other window."
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207 (interactive)
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208 (let ((symb (variable-at-point)))
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209 (when symb
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210 (describe-variable symb))))
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211
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212 (defun help-next-symbol ()
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213 "Move point to the next quoted symbol."
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214 (interactive)
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215 (search-forward "`" nil t))
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216
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217 (defun help-prev-symbol ()
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218 "Move point to the previous quoted symbol."
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219 (interactive)
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220 (search-backward "'" nil t))
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221
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222 (defun help-next-section ()
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223 "Move point to the next quoted symbol."
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224 (interactive)
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225 (search-forward-regexp "^\\w+:" nil t))
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226
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227 (defun help-prev-section ()
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228 "Move point to the previous quoted symbol."
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229 (interactive)
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230 (search-backward-regexp "^\\w+:" nil t))
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231
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232 (defun help-mode-bury ()
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233 "Bury the help buffer, possibly restoring the previous window configuration."
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234 (interactive)
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235 (help-mode-quit t))
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236
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237 (defun help-mode-quit (&optional bury)
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238 "Exit from help mode, possibly restoring the previous window configuration.
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239 If the optional argument BURY is non-nil, the help buffer is buried,
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240 otherwise it is killed."
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241 (interactive)
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242 (let ((buf (current-buffer)))
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243 (cond ((frame-property (selected-frame) 'help-window-config)
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244 (set-window-configuration
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245 (frame-property (selected-frame) 'help-window-config))
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246 (set-frame-property (selected-frame) 'help-window-config nil))
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247 ((not (one-window-p))
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248 (delete-window)))
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249 (if bury
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250 (bury-buffer buf)
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251 (kill-buffer buf))))
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252
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253 (defun help-quit ()
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254 (interactive)
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255 nil)
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256
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257 ;; This is a grody hack of the same genotype as `advertised-undo'; if the
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258 ;; bindings of Backspace and C-h are the same, we want the menubar to claim
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259 ;; that `info' in invoked with `C-h i', not `BS i'.
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260
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261 (defun deprecated-help-command ()
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262 (interactive)
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263 (if (eq 'help-command (key-binding "\C-h"))
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264 (setq unread-command-event (character-to-event ?\C-h))
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265 (help-for-help)))
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266
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267 ;;(define-key global-map 'backspace 'deprecated-help-command)
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268
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269 ;; This function has been moved to help-nomule.el and mule-help.el.
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270 ;; TUTORIAL arg is XEmacs addition
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271 ;(defun help-with-tutorial (&optional tutorial)
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272 ; "Select the XEmacs learn-by-doing tutorial.
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273 ;Optional arg TUTORIAL specifies the tutorial file; default is \"TUTORIAL\"."
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274 ; (interactive)
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275 ; (if (null tutorial)
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276 ; (setq tutorial "TUTORIAL"))
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277 ; (let ((file (expand-file-name (concat "~/" tutorial))))
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278 ; (delete-other-windows)
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279 ; (if (get-file-buffer file)
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280 ; (switch-to-buffer (get-file-buffer file))
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281 ; (switch-to-buffer (create-file-buffer file))
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282 ; (setq buffer-file-name file)
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283 ; (setq default-directory (expand-file-name "~/"))
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284 ; (setq buffer-auto-save-file-name nil)
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285 ; (insert-file-contents (expand-file-name tutorial data-directory))
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286 ; (goto-char (point-min))
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287 ; (search-forward "\n<<")
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288 ; (delete-region (point-at-bol) (point-at-eol))
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289 ; (let ((n (- (window-height (selected-window))
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290 ; (count-lines (point-min) (point))
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291 ; 6)))
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292 ; (if (< n 12)
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293 ; (newline n)
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294 ; ;; Some people get confused by the large gap.
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295 ; (newline (/ n 2))
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296 ; (insert "[Middle of page left blank for didactic purposes. "
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297 ; "Text continues below]")
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298 ; (newline (- n (/ n 2)))))
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299 ; (goto-char (point-min))
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300 ; (set-buffer-modified-p nil))))
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301
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302 ;; used by describe-key, describe-key-briefly, insert-key-binding, etc.
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303
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304 (defun key-or-menu-binding (key &optional menu-flag)
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305 "Return the command invoked by KEY.
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306 Like `key-binding', but handles menu events and toolbar presses correctly.
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307 KEY is any value returned by `next-command-event'.
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308 MENU-FLAG is a symbol that should be set to t if KEY is a menu event,
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309 or nil otherwise"
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310 (let (defn)
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311 (and menu-flag (set menu-flag nil))
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312 ;; If the key typed was really a menu selection, grab the form out
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313 ;; of the event object and intuit the function that would be called,
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314 ;; and describe that instead.
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315 (if (and (vectorp key) (= 1 (length key))
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316 (or (misc-user-event-p (aref key 0))
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317 (eq (car-safe (aref key 0)) 'menu-selection)))
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318 (let ((event (aref key 0)))
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319 (setq defn (if (eventp event)
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320 (list (event-function event) (event-object event))
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321 (cdr event)))
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322 (and menu-flag (set menu-flag t))
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323 (when (eq (car defn) 'eval)
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324 (setq defn (car (cdr defn))))
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325 (when (eq (car-safe defn) 'call-interactively)
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326 (setq defn (car (cdr defn))))
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327 (when (and (consp defn) (null (cdr defn)))
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328 (setq defn (car defn))))
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329 ;; else
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330 (setq defn (key-binding key)))
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331 ;; kludge: if a toolbar button was pressed on, try to find the
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332 ;; binding of the toolbar button.
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333 (if (and (eq defn 'press-toolbar-button)
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334 (vectorp key)
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335 (button-press-event-p (aref key (1- (length key)))))
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336 ;; wait for the button release. We're on shaky ground here ...
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337 (let ((event (next-command-event))
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338 button)
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339 (if (and (button-release-event-p event)
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340 (event-over-toolbar-p event)
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341 (eq 'release-and-activate-toolbar-button
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342 (key-binding (vector event)))
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343 (setq button (event-toolbar-button event)))
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344 (toolbar-button-callback button)
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345 ;; if anything went wrong, try returning the binding of
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346 ;; the button-up event, of the original binding
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347 (or (key-or-menu-binding (vector event))
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348 defn)))
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349 ;; no toolbar kludge
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350 defn)
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351 ))
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352
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353 (defun describe-key-briefly (key &optional insert)
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354 "Print the name of the function KEY invokes. KEY is a string.
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355 If INSERT (the prefix arg) is non-nil, insert the message in the buffer."
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356 (interactive "kDescribe key briefly: \nP")
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357 (let ((standard-output (if insert (current-buffer) t))
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358 defn menup)
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359 (setq defn (key-or-menu-binding key 'menup))
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360 (if (or (null defn) (integerp defn))
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361 (princ (format "%s is undefined" (key-description key)))
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362 ;; If it's a keyboard macro which trivially invokes another command,
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363 ;; document that instead.
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364 (if (or (stringp defn) (vectorp defn))
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365 (setq defn (or (key-binding defn)
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366 defn)))
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367 (let ((last-event (and (vectorp key)
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368 (aref key (1- (length key))))))
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369 (princ (format (cond (insert
|
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370 "%s (%s)")
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|
371 ((or (button-press-event-p last-event)
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372 (button-release-event-p last-event))
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373 (gettext "%s at that spot runs the command %s"))
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374 (t
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375 (gettext "%s runs the command %s")))
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376 ;; This used to say 'This menu item' but it
|
|
|
377 ;; could also be a scrollbar event. We can't
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|
378 ;; distinguish at the moment.
|
|
|
379 (if menup
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|
380 (if insert "item" "This item")
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381 (key-description key))
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|
382 (if (symbolp defn) defn (prin1-to-string defn))))))))
|
|
|
383
|
|
|
384 ;; #### this is a horrible piece of shit function that should
|
|
|
385 ;; not exist. In FSF 19.30 this function has gotten three times
|
|
|
386 ;; as long and has tons and tons of dumb shit checking
|
|
|
387 ;; special-display-buffer-names and such crap. I absolutely
|
|
|
388 ;; refuse to insert that Ebolification here. I wanted to delete
|
|
|
389 ;; this function entirely but Mly bitched.
|
|
|
390 ;;
|
|
|
391 ;; If your user-land code calls this function, rewrite it to
|
|
|
392 ;; call with-displaying-help-buffer.
|
|
|
393
|
|
|
394 (defun print-help-return-message (&optional function)
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|
395 "Display or return message saying how to restore windows after help command.
|
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|
396 Computes a message and applies the optional argument FUNCTION to it.
|
|
|
397 If FUNCTION is nil, applies `message' to it, thus printing it."
|
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398 (and (not (get-buffer-window standard-output))
|
|
|
399 (funcall
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|
|
400 (or function 'message)
|
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|
401 (concat
|
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|
402 (substitute-command-keys
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|
403 (if (one-window-p t)
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|
404 (if pop-up-windows
|
|
|
405 (gettext "Type \\[delete-other-windows] to remove help window.")
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|
406 (gettext "Type \\[switch-to-buffer] RET to remove help window."))
|
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|
407 (gettext "Type \\[switch-to-buffer-other-window] RET to restore the other window.")))
|
|
|
408 (substitute-command-keys
|
|
|
409 (gettext " \\[scroll-other-window] to scroll the help."))))))
|
|
|
410
|
|
|
411 (defcustom help-selects-help-window t
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|
|
412 "*If nil, use the \"old Emacs\" behavior for Help buffers.
|
|
|
413 This just displays the buffer in another window, rather than selecting
|
|
|
414 the window."
|
|
|
415 :type 'boolean
|
|
|
416 :group 'help-appearance)
|
|
|
417
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|
|
418 (defcustom help-max-help-buffers 10
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|
|
419 "*Maximum help buffers to allow before they start getting killed.
|
|
|
420 If this is a positive integer, before a help buffer is displayed
|
|
|
421 by `with-displaying-help-buffer', any excess help buffers which
|
|
|
422 are not being displayed are first killed. Otherwise, if it is
|
|
|
423 zero or nil, only one help buffer, \"*Help*\" is ever used."
|
|
|
424 :type '(choice integer (const :tag "None" nil))
|
|
|
425 :group 'help-appearance)
|
|
|
426
|
|
|
427 (defvar help-buffer-list nil
|
|
|
428 "List of help buffers used by `help-register-and-maybe-prune-excess'")
|
|
|
429
|
|
|
430 (defun help-register-and-maybe-prune-excess (newbuf)
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|
|
431 "Register use of a help buffer and possibly kill any excess ones."
|
|
|
432 ;; remove new buffer from list
|
|
|
433 (setq help-buffer-list (remove newbuf help-buffer-list))
|
|
|
434 ;; maybe kill excess help buffers
|
|
|
435 (if (and (integerp help-max-help-buffers)
|
|
|
436 (> (length help-buffer-list) help-max-help-buffers))
|
|
|
437 (let ((keep-list nil)
|
|
|
438 (num-kill (- (length help-buffer-list)
|
|
|
439 help-max-help-buffers)))
|
|
|
440 (while help-buffer-list
|
|
|
441 (let ((buf (car help-buffer-list)))
|
|
|
442 (if (and (or (equal buf newbuf) (get-buffer buf))
|
|
|
443 (string-match "^*Help" buf)
|
|
|
444 (save-excursion (set-buffer buf)
|
|
|
445 (eq major-mode 'help-mode)))
|
|
|
446 (if (and (>= num-kill (length help-buffer-list))
|
|
|
447 (not (get-buffer-window buf t t)))
|
|
|
448 (kill-buffer buf)
|
|
|
449 (setq keep-list (cons buf keep-list)))))
|
|
|
450 (setq help-buffer-list (cdr help-buffer-list)))
|
|
|
451 (setq help-buffer-list (nreverse keep-list))))
|
|
|
452 ;; push new buffer
|
|
|
453 (setq help-buffer-list (cons newbuf help-buffer-list)))
|
|
|
454
|
|
|
455 (defvar help-buffer-prefix-string "Help"
|
|
|
456 "Initial string to use in constructing help buffer names.
|
|
|
457 You should never set this directory, only let-bind it.")
|
|
|
458
|
|
|
459 (defun help-buffer-name (name)
|
|
|
460 "Return a name for a Help buffer using string NAME for context."
|
|
|
461 (if (and (integerp help-max-help-buffers)
|
|
|
462 (> help-max-help-buffers 0)
|
|
|
463 (stringp name))
|
|
|
464 (if help-buffer-prefix-string
|
|
|
465 (format "*%s: %s*" help-buffer-prefix-string name)
|
|
|
466 (format "*%s*" name))
|
|
|
467 (format "*%s*" help-buffer-prefix-string)))
|
|
|
468
|
|
|
469 ;; Use this function for displaying help when C-h something is pressed
|
|
|
470 ;; or in similar situations. Do *not* use it when you are displaying
|
|
|
471 ;; a help message and then prompting for input in the minibuffer --
|
|
|
472 ;; this macro usually selects the help buffer, which is not what you
|
|
|
473 ;; want in those situations.
|
|
|
474
|
|
|
475 ;; #### Should really be a macro to eliminate the requirement of
|
|
|
476 ;; caller to code a lambda form in THUNK -- mrb
|
|
|
477
|
|
|
478 ;; #### BEFORE you rush to make this a macro, think about backward
|
|
|
479 ;; compatibility. The right way would be to create a macro with
|
|
|
480 ;; another name (which is a shame, because w-d-h-b is a perfect name
|
|
|
481 ;; for a macro) that uses with-displaying-help-buffer internally.
|
|
|
482
|
|
|
483 (defun with-displaying-help-buffer (thunk &optional name)
|
|
|
484 "Form which makes a help buffer with given NAME and evaluates BODY there.
|
|
|
485 The actual name of the buffer is generated by the function `help-buffer-name'."
|
|
|
486 (let* ((winconfig (current-window-configuration))
|
|
|
487 (was-one-window (one-window-p))
|
|
|
488 (buffer-name (help-buffer-name name))
|
|
|
489 (help-not-visible
|
|
|
490 (not (and (windows-of-buffer buffer-name) ;shortcut
|
|
|
491 (memq (selected-frame)
|
|
|
492 (mapcar 'window-frame
|
|
|
493 (windows-of-buffer buffer-name)))))))
|
|
|
494 (help-register-and-maybe-prune-excess buffer-name)
|
|
|
495 (prog1 (with-output-to-temp-buffer buffer-name
|
|
|
496 (prog1 (funcall thunk)
|
|
|
497 (save-excursion
|
|
|
498 (set-buffer standard-output)
|
|
|
499 (help-mode))))
|
|
|
500 (let ((helpwin (get-buffer-window buffer-name)))
|
|
|
501 (when helpwin
|
|
|
502 (with-current-buffer (window-buffer helpwin)
|
|
|
503 ;; If the *Help* buffer is already displayed on this
|
|
|
504 ;; frame, don't override the previous configuration
|
|
|
505 (when help-not-visible
|
|
|
506 (set-frame-property (selected-frame)
|
|
|
507 'help-window-config winconfig)))
|
|
|
508 (when help-selects-help-window
|
|
|
509 (select-window helpwin))
|
|
|
510 (cond ((eq helpwin (selected-window))
|
|
|
511 (display-message 'command
|
|
|
512 (substitute-command-keys "Type \\[help-mode-quit] to remove help window, \\[scroll-up] to scroll the help.")))
|
|
|
513 (was-one-window
|
|
|
514 (display-message 'command
|
|
|
515 (substitute-command-keys "Type \\[delete-other-windows] to remove help window, \\[scroll-other-window] to scroll the help.")))
|
|
|
516 (t
|
|
|
517 (display-message 'command
|
|
|
518 (substitute-command-keys "Type \\[switch-to-buffer-other-window] to restore the other window, \\[scroll-other-window] to scroll the help.")))))))))
|
|
|
519
|
|
|
520 (defun describe-key (key)
|
|
|
521 "Display documentation of the function invoked by KEY.
|
|
|
522 KEY is a string, or vector of events.
|
|
|
523 When called interactively, KEY may also be a menu selection."
|
|
|
524 (interactive "kDescribe key: ")
|
|
|
525 (let ((defn (key-or-menu-binding key))
|
|
|
526 (key-string (key-description key)))
|
|
|
527 (if (or (null defn) (integerp defn))
|
|
|
528 (message "%s is undefined" key-string)
|
|
|
529 (with-displaying-help-buffer
|
|
|
530 (lambda ()
|
|
|
531 (princ key-string)
|
|
|
532 (princ " runs ")
|
|
|
533 (if (symbolp defn)
|
|
|
534 (princ (format "`%s'" defn))
|
|
|
535 (princ defn))
|
|
|
536 (princ "\n\n")
|
|
|
537 (cond ((or (stringp defn) (vectorp defn))
|
|
|
538 (let ((cmd (key-binding defn)))
|
|
|
539 (if (not cmd)
|
|
|
540 (princ "a keyboard macro")
|
|
|
541 (progn
|
|
|
542 (princ "a keyboard macro which runs the command ")
|
|
|
543 (princ cmd)
|
|
|
544 (princ ":\n\n")
|
|
|
545 (if (documentation cmd) (princ (documentation cmd)))))))
|
|
|
546 ((and (consp defn) (not (eq 'lambda (car-safe defn))))
|
|
|
547 (let ((describe-function-show-arglist nil))
|
|
|
548 (describe-function-1 (car defn))))
|
|
|
549 ((symbolp defn)
|
|
|
550 (describe-function-1 defn))
|
|
|
551 ((documentation defn)
|
|
|
552 (princ (documentation defn)))
|
|
|
553 (t
|
|
|
554 (princ "not documented"))))
|
|
|
555 (format "key `%s'" key-string)))))
|
|
|
556
|
|
|
557 (defun describe-mode ()
|
|
|
558 "Display documentation of current major mode and minor modes.
|
|
|
559 For this to work correctly for a minor mode, the mode's indicator variable
|
|
|
560 \(listed in `minor-mode-alist') must also be a function whose documentation
|
|
|
561 describes the minor mode."
|
|
|
562 (interactive)
|
|
|
563 (with-displaying-help-buffer
|
|
|
564 (lambda ()
|
|
|
565 ;; XEmacs change: print the major-mode documentation before
|
|
|
566 ;; the minor modes.
|
|
|
567 (princ mode-name)
|
|
|
568 (princ " mode:\n")
|
|
|
569 (princ (documentation major-mode))
|
|
|
570 (princ "\n\n----\n\n")
|
|
|
571 (let ((minor-modes minor-mode-alist))
|
|
|
572 (while minor-modes
|
|
|
573 (let* ((minor-mode (car (car minor-modes)))
|
|
|
574 (indicator (car (cdr (car minor-modes)))))
|
|
|
575 ;; Document a minor mode if it is listed in minor-mode-alist,
|
|
|
576 ;; bound locally in this buffer, non-nil, and has a function
|
|
|
577 ;; definition.
|
|
|
578 (if (and (boundp minor-mode)
|
|
|
579 (symbol-value minor-mode)
|
|
|
580 (fboundp minor-mode))
|
|
|
581 (let ((pretty-minor-mode minor-mode))
|
|
|
582 (if (string-match "-mode\\'" (symbol-name minor-mode))
|
|
|
583 (setq pretty-minor-mode
|
|
|
584 (capitalize
|
|
|
585 (substring (symbol-name minor-mode)
|
|
|
586 0 (match-beginning 0)))))
|
|
|
587 (while (and (consp indicator) (extentp (car indicator)))
|
|
|
588 (setq indicator (cdr indicator)))
|
|
|
589 (while (and indicator (symbolp indicator))
|
|
|
590 (setq indicator (symbol-value indicator)))
|
|
|
591 (princ (format "%s minor mode (indicator%s):\n"
|
|
|
592 pretty-minor-mode indicator))
|
|
|
593 (princ (documentation minor-mode))
|
|
|
594 (princ "\n\n----\n\n"))))
|
|
|
595 (setq minor-modes (cdr minor-modes)))))
|
|
|
596 (format "%s mode" mode-name)))
|
|
|
597
|
|
|
598 ;; So keyboard macro definitions are documented correctly
|
|
|
599 (fset 'defining-kbd-macro (symbol-function 'start-kbd-macro))
|
|
|
600
|
|
|
601 (defun describe-distribution ()
|
|
|
602 "Display info on how to obtain the latest version of XEmacs."
|
|
|
603 (interactive)
|
|
|
604 (find-file-read-only
|
|
|
605 (locate-data-file "DISTRIB")))
|
|
|
606
|
|
|
607 (defun describe-beta ()
|
|
|
608 "Display info on how to deal with Beta versions of XEmacs."
|
|
|
609 (interactive)
|
|
|
610 (find-file-read-only
|
|
|
611 (locate-data-file "BETA"))
|
|
|
612 (goto-char (point-min)))
|
|
|
613
|
|
|
614 (defun describe-copying ()
|
|
|
615 "Display info on how you may redistribute copies of XEmacs."
|
|
|
616 (interactive)
|
|
|
617 (find-file-read-only
|
|
|
618 (locate-data-file "COPYING"))
|
|
|
619 (goto-char (point-min)))
|
|
|
620
|
|
|
621 (defun describe-pointer ()
|
|
|
622 "Show a list of all defined mouse buttons, and their definitions."
|
|
|
623 (interactive)
|
|
|
624 (describe-bindings nil t))
|
|
|
625
|
|
|
626 (defun describe-project ()
|
|
|
627 "Display info on the GNU project."
|
|
|
628 (interactive)
|
|
|
629 (find-file-read-only
|
|
|
630 (locate-data-file "GNU"))
|
|
|
631 (goto-char (point-min)))
|
|
|
632
|
|
|
633 (defun describe-no-warranty ()
|
|
|
634 "Display info on all the kinds of warranty XEmacs does NOT have."
|
|
|
635 (interactive)
|
|
|
636 (describe-copying)
|
|
|
637 (let (case-fold-search)
|
|
|
638 (search-forward "NO WARRANTY")
|
|
|
639 (recenter 0)))
|
|
|
640
|
|
|
641 (defun describe-bindings (&optional prefix mouse-only-p)
|
|
|
642 "Show a list of all defined keys, and their definitions.
|
|
|
643 The list is put in a buffer, which is displayed.
|
|
|
644 If the optional argument PREFIX is supplied, only commands which
|
|
|
645 start with that sequence of keys are described.
|
|
|
646 If the second argument (prefix arg, interactively) is non-null
|
|
|
647 then only the mouse bindings are displayed."
|
|
|
648 (interactive (list nil current-prefix-arg))
|
|
|
649 (with-displaying-help-buffer
|
|
|
650 (lambda ()
|
|
|
651 (describe-bindings-1 prefix mouse-only-p))
|
|
|
652 (format "bindings for %s" major-mode)))
|
|
|
653
|
|
|
654 (defun describe-bindings-1 (&optional prefix mouse-only-p)
|
|
|
655 (let ((heading (if mouse-only-p
|
|
|
656 (gettext "button binding\n------ -------\n")
|
|
|
657 (gettext "key binding\n--- -------\n")))
|
|
|
658 (buffer (current-buffer))
|
|
|
659 (minor minor-mode-map-alist)
|
|
|
660 (local (current-local-map))
|
|
|
661 (shadow '()))
|
|
|
662 (set-buffer standard-output)
|
|
|
663 (while minor
|
|
|
664 (let ((sym (car (car minor)))
|
|
|
665 (map (cdr (car minor))))
|
|
|
666 (if (symbol-value-in-buffer sym buffer nil)
|
|
|
667 (progn
|
|
|
668 (insert (format "Minor Mode Bindings for `%s':\n"
|
|
|
669 sym)
|
|
|
670 heading)
|
|
|
671 (describe-bindings-internal map nil shadow prefix mouse-only-p)
|
|
|
672 (insert "\n")
|
|
|
673 (setq shadow (cons map shadow))))
|
|
|
674 (setq minor (cdr minor))))
|
|
|
675 (if local
|
|
|
676 (progn
|
|
|
677 (insert "Local Bindings:\n" heading)
|
|
|
678 (describe-bindings-internal local nil shadow prefix mouse-only-p)
|
|
|
679 (insert "\n")
|
|
|
680 (setq shadow (cons local shadow))))
|
|
|
681 (insert "Global Bindings:\n" heading)
|
|
|
682 (describe-bindings-internal (current-global-map)
|
|
|
683 nil shadow prefix mouse-only-p)
|
|
|
684 (when (and prefix function-key-map (not mouse-only-p))
|
|
|
685 (insert "\nFunction key map translations:\n" heading)
|
|
|
686 (describe-bindings-internal function-key-map nil nil
|
|
|
687 prefix mouse-only-p))
|
|
|
688 (set-buffer buffer)
|
|
|
689 standard-output))
|
|
|
690
|
|
|
691 (defun describe-prefix-bindings ()
|
|
|
692 "Describe the bindings of the prefix used to reach this command.
|
|
|
693 The prefix described consists of all but the last event
|
|
|
694 of the key sequence that ran this command."
|
|
|
695 (interactive)
|
|
|
696 (let* ((key (this-command-keys))
|
|
|
697 (prefix (make-vector (1- (length key)) nil))
|
|
|
698 i)
|
|
|
699 (setq i 0)
|
|
|
700 (while (< i (length prefix))
|
|
|
701 (aset prefix i (aref key i))
|
|
|
702 (setq i (1+ i)))
|
|
|
703 (with-displaying-help-buffer
|
|
|
704 (lambda ()
|
|
|
705 (princ "Key bindings starting with ")
|
|
|
706 (princ (key-description prefix))
|
|
|
707 (princ ":\n\n")
|
|
|
708 (describe-bindings-1 prefix nil))
|
|
|
709 (format "%s prefix" (key-description prefix)))))
|
|
|
710
|
|
|
711 ;; Make C-h after a prefix, when not specifically bound,
|
|
|
712 ;; run describe-prefix-bindings.
|
|
|
713 (setq prefix-help-command 'describe-prefix-bindings)
|
|
|
714
|
|
|
715 (defun describe-installation ()
|
|
|
716 "Display a buffer showing information about this XEmacs was compiled."
|
|
|
717 (interactive)
|
|
|
718 (if (and (boundp 'Installation-string)
|
|
|
719 (stringp Installation-string))
|
|
|
720 (with-displaying-help-buffer
|
|
|
721 (lambda ()
|
|
|
722 (princ Installation-string))
|
|
|
723 "Installation")
|
|
|
724 (error "No Installation information available.")))
|
|
|
725
|
|
|
726 (defun view-emacs-news ()
|
|
|
727 "Display info on recent changes to XEmacs."
|
|
|
728 (interactive)
|
|
|
729 (find-file (locate-data-file "NEWS")))
|
|
|
730
|
|
|
731 (defun xemacs-www-page ()
|
|
|
732 "Go to the XEmacs World Wide Web page."
|
|
|
733 (interactive)
|
|
|
734 (if (boundp 'browse-url-browser-function)
|
|
|
735 (funcall browse-url-browser-function "http://www.xemacs.org/")
|
|
|
736 (error "xemacs-www-page requires browse-url")))
|
|
|
737
|
|
|
738 (defun xemacs-www-faq ()
|
|
|
739 "View the latest and greatest XEmacs FAQ using the World Wide Web."
|
|
|
740 (interactive)
|
|
|
741 (if (boundp 'browse-url-browser-function)
|
|
|
742 (funcall browse-url-browser-function
|
|
|
743 "http://www.xemacs.org/faq/index.html")
|
|
|
744 (error "xemacs-www-faq requires browse-url")))
|
|
|
745
|
|
|
746 (defun xemacs-local-faq ()
|
|
|
747 "View the local copy of the XEmacs FAQ.
|
|
|
748 If you have access to the World Wide Web, you should use `xemacs-www-faq'
|
|
|
749 instead, to ensure that you get the most up-to-date information."
|
|
|
750 (interactive)
|
|
|
751 (save-window-excursion
|
|
|
752 (info)
|
|
|
753 (Info-find-node "xemacs-faq" "Top"))
|
|
|
754 (switch-to-buffer "*info*"))
|
|
|
755
|
|
|
756 (defcustom view-lossage-key-count 100
|
|
|
757 "*Number of keys `view-lossage' shows.
|
|
|
758 The maximum number of available keys is governed by `recent-keys-ring-size'."
|
|
|
759 :type 'integer
|
|
|
760 :group 'help)
|
|
|
761
|
|
|
762 (defcustom view-lossage-message-count 100
|
|
|
763 "*Number of minibuffer messages `view-lossage' shows."
|
|
|
764 :type 'integer
|
|
|
765 :group 'help)
|
|
|
766
|
|
|
767 (defun print-recent-messages (n)
|
|
|
768 "Print N most recent messages to standard-output, most recent first.
|
|
|
769 If N is nil, all messages will be printed."
|
|
|
770 (save-excursion
|
|
|
771 (let ((buffer (get-buffer-create " *Message-Log*"))
|
|
|
772 oldpoint extent)
|
|
|
773 (goto-char (point-max buffer) buffer)
|
|
|
774 (set-buffer standard-output)
|
|
|
775 (while (and (not (bobp buffer))
|
|
|
776 (or (null n) (>= (decf n) 0)))
|
|
|
777 (setq oldpoint (point buffer))
|
|
|
778 (setq extent (extent-at oldpoint buffer
|
|
|
779 'message-multiline nil 'before))
|
|
|
780 ;; If the message was multiline, move all the way to the
|
|
|
781 ;; beginning.
|
|
|
782 (if extent
|
|
|
783 (goto-char (extent-start-position extent) buffer)
|
|
|
784 (forward-line -1 buffer))
|
|
|
785 (insert-buffer-substring buffer (point buffer) oldpoint)))))
|
|
|
786
|
|
|
787 (defun view-lossage ()
|
|
|
788 "Display recent input keystrokes and recent minibuffer messages.
|
|
|
789 The number of keys shown is controlled by `view-lossage-key-count'.
|
|
|
790 The number of messages shown is controlled by `view-lossage-message-count'."
|
|
|
791 (interactive)
|
|
|
792 (with-displaying-help-buffer
|
|
|
793 (lambda ()
|
|
|
794 (princ (key-description (recent-keys view-lossage-key-count)))
|
|
|
795 (save-excursion
|
|
|
796 (set-buffer standard-output)
|
|
|
797 (goto-char (point-min))
|
|
|
798 (insert "Recent keystrokes:\n\n")
|
|
|
799 (while (progn (move-to-column 50) (not (eobp)))
|
|
|
800 (search-forward " " nil t)
|
|
|
801 (insert "\n")))
|
|
|
802 ;; XEmacs addition: copy the messages from " *Message-Log*",
|
|
|
803 ;; reversing their order and handling multiline messages
|
|
|
804 ;; correctly.
|
|
|
805 (princ "\n\n\nRecent minibuffer messages (most recent first):\n\n")
|
|
|
806 (print-recent-messages view-lossage-message-count))
|
|
|
807 "lossage"))
|
|
|
808
|
|
|
809 (define-function 'help 'help-for-help)
|
|
|
810
|
|
|
811 (make-help-screen help-for-help
|
|
|
812 "A B C F I K L M N P S T V W C-c C-d C-f C-i C-k C-n C-w; ? for more help:"
|
|
|
813 "Type a Help option:
|
|
|
814 \(Use SPC or DEL to scroll through this text. Type \\<help-map>\\[help-quit] to exit the Help command.)
|
|
|
815
|
|
|
816 \\[hyper-apropos] Type a substring; it shows a hypertext list of
|
|
|
817 functions and variables that contain that substring.
|
|
|
818 See also the `apropos' command.
|
|
|
819 \\[command-apropos] Type a substring; it shows a list of commands
|
|
|
820 (interactively callable functions) that contain that substring.
|
|
|
821 \\[describe-bindings] Table of all key bindings.
|
|
|
822 \\[describe-key-briefly] Type a command key sequence;
|
|
|
823 it displays the function name that sequence runs.
|
|
|
824 \\[customize] Customize Emacs options.
|
|
|
825 \\[Info-goto-emacs-command-node] Type a function name; it displays the Info node for that command.
|
|
|
826 \\[describe-function] Type a function name; it shows its documentation.
|
|
|
827 \\[Info-elisp-ref] Type a function name; it jumps to the full documentation
|
|
|
828 in the XEmacs Lisp Programmer's Manual.
|
|
|
829 \\[xemacs-local-faq] Local copy of the XEmacs FAQ.
|
|
|
830 \\[info] Info documentation reader.
|
|
|
831 \\[Info-query] Type an Info file name; it displays it in Info reader.
|
|
|
832 \\[describe-key] Type a command key sequence;
|
|
|
833 it displays the documentation for the command bound to that key.
|
|
|
834 \\[Info-goto-emacs-key-command-node] Type a command key sequence;
|
|
|
835 it displays the Info node for the command bound to that key.
|
|
|
836 \\[view-lossage] Recent input keystrokes and minibuffer messages.
|
|
|
837 \\[describe-mode] Documentation of current major and minor modes.
|
|
|
838 \\[view-emacs-news] News of recent XEmacs changes.
|
|
|
839 \\[finder-by-keyword] Type a topic keyword; it finds matching packages.
|
|
|
840 \\[describe-pointer] Table of all mouse-button bindings.
|
|
|
841 \\[describe-syntax] Contents of syntax table with explanations.
|
|
|
842 \\[help-with-tutorial] XEmacs learn-by-doing tutorial.
|
|
|
843 \\[describe-variable] Type a variable name; it displays its documentation and value.
|
|
|
844 \\[where-is] Type a command name; it displays which keystrokes invoke that command.
|
|
|
845 \\[describe-distribution] XEmacs ordering information.
|
|
|
846 \\[describe-no-warranty] Information on absence of warranty for XEmacs.
|
|
|
847 \\[describe-copying] XEmacs copying permission (General Public License)."
|
|
|
848 help-map)
|
|
|
849
|
|
|
850 (defmacro with-syntax-table (syntab &rest body)
|
|
|
851 "Evaluate BODY with the syntax-table SYNTAB"
|
|
|
852 `(let ((stab (syntax-table)))
|
|
|
853 (unwind-protect
|
|
|
854 (progn
|
|
|
855 (set-syntax-table (copy-syntax-table ,syntab))
|
|
|
856 ,@body)
|
|
|
857 (set-syntax-table stab))))
|
|
|
858 (put 'with-syntax-table 'lisp-indent-function 1)
|
|
|
859 (put 'with-syntax-table 'edebug-form-spec '(form body))
|
|
|
860
|
|
|
861 (defun function-called-at-point ()
|
|
|
862 "Return the function which is called by the list containing point.
|
|
|
863 If that gives no function, return the function whose name is around point.
|
|
|
864 If that doesn't give a function, return nil."
|
|
|
865 (or (ignore-errors
|
|
|
866 (save-excursion
|
|
|
867 (save-restriction
|
|
|
868 (narrow-to-region (max (point-min) (- (point) 1000))
|
|
|
869 (point-max))
|
|
|
870 (backward-up-list 1)
|
|
|
871 (forward-char 1)
|
|
|
872 (let (obj)
|
|
|
873 (setq obj (read (current-buffer)))
|
|
|
874 (and (symbolp obj) (fboundp obj) obj)))))
|
|
|
875 (ignore-errors
|
|
|
876 (with-syntax-table emacs-lisp-mode-syntax-table
|
|
|
877 (save-excursion
|
|
|
878 (or (not (zerop (skip-syntax-backward "_w")))
|
|
|
879 (eq (char-syntax (char-after (point))) ?w)
|
|
|
880 (eq (char-syntax (char-after (point))) ?_)
|
|
|
881 (forward-sexp -1))
|
|
|
882 (skip-chars-forward "`'")
|
|
|
883 (let ((obj (read (current-buffer))))
|
|
|
884 (and (symbolp obj) (fboundp obj) obj)))))))
|
|
|
885
|
|
|
886 (defun function-at-point ()
|
|
|
887 "Return the function whose name is around point.
|
|
|
888 If that gives no function, return the function which is called by the
|
|
|
889 list containing point. If that doesn't give a function, return nil."
|
|
|
890 (or (ignore-errors
|
|
|
891 (with-syntax-table emacs-lisp-mode-syntax-table
|
|
|
892 (save-excursion
|
|
|
893 (or (not (zerop (skip-syntax-backward "_w")))
|
|
|
894 (eq (char-syntax (char-after (point))) ?w)
|
|
|
895 (eq (char-syntax (char-after (point))) ?_)
|
|
|
896 (forward-sexp -1))
|
|
|
897 (skip-chars-forward "`'")
|
|
|
898 (let ((obj (read (current-buffer))))
|
|
|
899 (and (symbolp obj) (fboundp obj) obj)))))
|
|
|
900 (ignore-errors
|
|
|
901 (save-excursion
|
|
|
902 (save-restriction
|
|
|
903 (narrow-to-region (max (point-min) (- (point) 1000))
|
|
|
904 (point-max))
|
|
|
905 (backward-up-list 1)
|
|
|
906 (forward-char 1)
|
|
|
907 (let (obj)
|
|
|
908 (setq obj (read (current-buffer)))
|
|
|
909 (and (symbolp obj) (fboundp obj) obj)))))))
|
|
|
910
|
|
|
911 ;; Default to nil for the non-hackers? Not until we find a way to
|
|
|
912 ;; distinguish hackers from non-hackers automatically!
|
|
|
913 (defcustom describe-function-show-arglist t
|
|
|
914 "*If non-nil, describe-function will show its arglist,
|
|
|
915 unless the function is autoloaded."
|
|
|
916 :type 'boolean
|
|
|
917 :group 'help-appearance)
|
|
|
918
|
|
|
919 (defun describe-symbol-find-file (symbol)
|
|
|
920 (loop for (file . load-data) in load-history
|
|
|
921 do (when (memq symbol load-data)
|
|
|
922 (return file))))
|
|
|
923
|
|
|
924 (define-obsolete-function-alias
|
|
|
925 'describe-function-find-file
|
|
|
926 'describe-symbol-find-file)
|
|
|
927
|
|
|
928 (defun describe-function (function)
|
|
|
929 "Display the full documentation of FUNCTION (a symbol).
|
|
|
930 When run interactively, it defaults to any function found by
|
|
|
931 `function-at-point'."
|
|
|
932 (interactive
|
|
|
933 (let* ((fn (function-at-point))
|
|
|
934 (val (let ((enable-recursive-minibuffers t))
|
|
|
935 (completing-read
|
|
|
936 (if fn
|
|
|
937 (format (gettext "Describe function (default %s): ")
|
|
|
938 fn)
|
|
|
939 (gettext "Describe function: "))
|
|
|
940 obarray 'fboundp t nil 'function-history))))
|
|
|
941 (list (if (equal val "") fn (intern val)))))
|
|
|
942 (with-displaying-help-buffer
|
|
|
943 (lambda ()
|
|
|
944 (describe-function-1 function)
|
|
|
945 ;; Return the text we displayed.
|
|
|
946 (buffer-string nil nil standard-output))
|
|
|
947 (format "function `%s'" function)))
|
|
|
948
|
|
|
949 (defun function-obsolete-p (function)
|
|
|
950 "Return non-nil if FUNCTION is obsolete."
|
|
|
951 (not (null (get function 'byte-obsolete-info))))
|
|
|
952
|
|
|
953 (defun function-obsoleteness-doc (function)
|
|
|
954 "If FUNCTION is obsolete, return a string describing this."
|
|
|
955 (let ((obsolete (get function 'byte-obsolete-info)))
|
|
|
956 (if obsolete
|
|
|
957 (format "Obsolete; %s"
|
|
|
958 (if (stringp (car obsolete))
|
|
|
959 (car obsolete)
|
|
|
960 (format "use `%s' instead." (car obsolete)))))))
|
|
|
961
|
|
|
962 (defun function-compatible-p (function)
|
|
|
963 "Return non-nil if FUNCTION is present for Emacs compatibility."
|
|
|
964 (not (null (get function 'byte-compatible-info))))
|
|
|
965
|
|
|
966 (defun function-compatibility-doc (function)
|
|
|
967 "If FUNCTION is Emacs compatible, return a string describing this."
|
|
|
968 (let ((compatible (get function 'byte-compatible-info)))
|
|
|
969 (if compatible
|
|
|
970 (format "Emacs Compatible; %s"
|
|
|
971 (if (stringp (car compatible))
|
|
|
972 (car compatible)
|
|
|
973 (format "use `%s' instead." (car compatible)))))))
|
|
|
974
|
|
|
975 ;Here are all the possibilities below spelled out, for the benefit
|
|
|
976 ;of the I18N3 snarfer.
|
|
|
977 ;
|
|
|
978 ;(gettext "a built-in function")
|
|
|
979 ;(gettext "an interactive built-in function")
|
|
|
980 ;(gettext "a built-in macro")
|
|
|
981 ;(gettext "an interactive built-in macro")
|
|
|
982 ;(gettext "a compiled Lisp function")
|
|
|
983 ;(gettext "an interactive compiled Lisp function")
|
|
|
984 ;(gettext "a compiled Lisp macro")
|
|
|
985 ;(gettext "an interactive compiled Lisp macro")
|
|
|
986 ;(gettext "a Lisp function")
|
|
|
987 ;(gettext "an interactive Lisp function")
|
|
|
988 ;(gettext "a Lisp macro")
|
|
|
989 ;(gettext "an interactive Lisp macro")
|
|
|
990 ;(gettext "a mocklisp function")
|
|
|
991 ;(gettext "an interactive mocklisp function")
|
|
|
992 ;(gettext "a mocklisp macro")
|
|
|
993 ;(gettext "an interactive mocklisp macro")
|
|
|
994 ;(gettext "an autoloaded Lisp function")
|
|
|
995 ;(gettext "an interactive autoloaded Lisp function")
|
|
|
996 ;(gettext "an autoloaded Lisp macro")
|
|
|
997 ;(gettext "an interactive autoloaded Lisp macro")
|
|
|
998
|
|
|
999 ;; taken out of `describe-function-1'
|
|
|
1000 (defun function-arglist (function)
|
|
|
1001 "Return a string giving the argument list of FUNCTION.
|
|
|
1002 For example:
|
|
|
1003
|
|
|
1004 (function-arglist 'function-arglist)
|
|
|
1005 => (function-arglist FUNCTION)
|
|
|
1006
|
|
|
1007 This function is used by `describe-function-1' to list function
|
|
|
1008 arguments in the standard Lisp style."
|
|
|
1009 (let* ((fndef (indirect-function function))
|
|
|
1010 (arglist
|
|
|
1011 (cond ((compiled-function-p fndef)
|
|
|
1012 (compiled-function-arglist fndef))
|
|
|
1013 ((eq (car-safe fndef) 'lambda)
|
|
|
1014 (nth 1 fndef))
|
|
|
1015 ((subrp fndef)
|
|
|
1016 (let* ((doc (documentation function))
|
|
|
1017 (args (and (string-match
|
|
|
1018 "[\n\t ]*\narguments: ?(\\(.*\\))\n?\\'"
|
|
|
1019 doc)
|
|
|
1020 (match-string 1 doc))))
|
|
|
1021 ;; If there are no arguments documented for the
|
|
|
1022 ;; subr, rather don't print anything.
|
|
|
1023 (cond ((null args) t)
|
|
|
1024 ((equal args "") nil)
|
|
|
1025 (args))))
|
|
|
1026 (t t))))
|
|
|
1027 (cond ((listp arglist)
|
|
|
1028 (prin1-to-string
|
|
|
1029 (cons function (mapcar (lambda (arg)
|
|
|
1030 (if (memq arg '(&optional &rest))
|
|
|
1031 arg
|
|
|
1032 (intern (upcase (symbol-name arg)))))
|
|
|
1033 arglist))
|
|
|
1034 t))
|
|
|
1035 ((stringp arglist)
|
|
|
1036 (format "(%s %s)" function arglist)))))
|
|
|
1037
|
|
|
1038 (defun function-documentation (function &optional strip-arglist)
|
|
|
1039 "Return a string giving the documentation for FUNCTION, if any.
|
|
|
1040 If the optional argument STRIP-ARGLIST is non-nil, remove the arglist
|
|
|
1041 part of the documentation of internal subroutines."
|
|
|
1042 (let ((doc (condition-case nil
|
|
|
1043 (or (documentation function)
|
|
|
1044 (gettext "not documented"))
|
|
|
1045 (void-function ""))))
|
|
|
1046 (if (and strip-arglist
|
|
|
1047 (string-match "[\n\t ]*\narguments: ?(\\(.*\\))\n?\\'" doc))
|
|
|
1048 (setq doc (substring doc 0 (match-beginning 0))))
|
|
|
1049 doc))
|
|
|
1050
|
|
|
1051 (defun describe-function-1 (function &optional nodoc)
|
|
|
1052 "This function does the work for `describe-function'."
|
|
|
1053 (princ (format "`%s' is " function))
|
|
|
1054 (let* ((def function)
|
|
|
1055 aliases file-name autoload-file kbd-macro-p fndef macrop)
|
|
|
1056 (while (and (symbolp def) (fboundp def))
|
|
|
1057 (when (not (eq def function))
|
|
|
1058 (setq aliases
|
|
|
1059 (if aliases
|
|
|
1060 ;; I18N3 Need gettext due to concat
|
|
|
1061 (concat aliases
|
|
|
1062 (format
|
|
|
1063 "\n which is an alias for `%s', "
|
|
|
1064 (symbol-name def)))
|
|
|
1065 (format "an alias for `%s', " (symbol-name def)))))
|
|
|
1066 (setq def (symbol-function def)))
|
|
|
1067 (if (and (fboundp 'compiled-function-annotation)
|
|
|
1068 (compiled-function-p def))
|
|
|
1069 (setq file-name (compiled-function-annotation def)))
|
|
|
1070 (if (eq 'macro (car-safe def))
|
|
|
1071 (setq fndef (cdr def)
|
|
|
1072 file-name (and (compiled-function-p (cdr def))
|
|
|
1073 (fboundp 'compiled-function-annotation)
|
|
|
1074 (compiled-function-annotation (cdr def)))
|
|
|
1075 macrop t)
|
|
|
1076 (setq fndef def))
|
|
|
1077 (if aliases (princ aliases))
|
|
|
1078 (let ((int #'(lambda (string an-p macro-p)
|
|
|
1079 (princ (format
|
|
|
1080 (gettext (concat
|
|
|
1081 (cond ((commandp def)
|
|
|
1082 "an interactive ")
|
|
|
1083 (an-p "an ")
|
|
|
1084 (t "a "))
|
|
|
1085 "%s"
|
|
|
1086 (if macro-p " macro" " function")))
|
|
|
1087 string)))))
|
|
|
1088 (cond ((or (stringp def) (vectorp def))
|
|
|
1089 (princ "a keyboard macro.")
|
|
|
1090 (setq kbd-macro-p t))
|
|
|
1091 ((subrp fndef)
|
|
|
1092 (funcall int "built-in" nil macrop))
|
|
|
1093 ((compiled-function-p fndef)
|
|
|
1094 (funcall int "compiled Lisp" nil macrop))
|
|
|
1095 ((eq (car-safe fndef) 'lambda)
|
|
|
1096 (funcall int "Lisp" nil macrop))
|
|
|
1097 ((eq (car-safe fndef) 'mocklisp)
|
|
|
1098 (funcall int "mocklisp" nil macrop))
|
|
|
1099 ((eq (car-safe def) 'autoload)
|
|
|
1100 (setq autoload-file (elt def 1))
|
|
|
1101 (funcall int "autoloaded Lisp" t (elt def 4)))
|
|
|
1102 ((and (symbolp def) (not (fboundp def)))
|
|
|
1103 (princ "a symbol with a void (unbound) function definition."))
|
|
|
1104 (t
|
|
|
1105 nil)))
|
|
|
1106 (princ "\n")
|
|
|
1107 (if autoload-file
|
|
|
1108 (princ (format " -- autoloads from \"%s\"\n" autoload-file)))
|
|
|
1109 (or file-name
|
|
|
1110 (setq file-name (describe-symbol-find-file function)))
|
|
|
1111 (if file-name
|
|
|
1112 (princ (format " -- loaded from \"%s\"\n" file-name)))
|
|
|
1113 ;; (terpri)
|
|
|
1114 (if describe-function-show-arglist
|
|
|
1115 (let ((arglist (function-arglist function)))
|
|
|
1116 (when arglist
|
|
|
1117 (princ arglist)
|
|
|
1118 (terpri))))
|
|
|
1119 (terpri)
|
|
|
1120 (cond (kbd-macro-p
|
|
|
1121 (princ "These characters are executed:\n\n\t")
|
|
|
1122 (princ (key-description def))
|
|
|
1123 (cond ((setq def (key-binding def))
|
|
|
1124 (princ (format "\n\nwhich executes the command `%s'.\n\n"
|
|
|
1125 def))
|
|
|
1126 (describe-function-1 def))))
|
|
|
1127 (nodoc nil)
|
|
|
1128 (t
|
|
|
1129 ;; tell the user about obsoleteness.
|
|
|
1130 ;; If the function is obsolete and is aliased, don't
|
|
|
1131 ;; even bother to report the documentation, as a further
|
|
|
1132 ;; encouragement to use the new function.
|
|
|
1133 (let ((obsolete (function-obsoleteness-doc function))
|
|
|
1134 (compatible (function-compatibility-doc function)))
|
|
|
1135 (when obsolete
|
|
|
1136 (princ obsolete)
|
|
|
1137 (terpri)
|
|
|
1138 (terpri))
|
|
|
1139 (when compatible
|
|
|
1140 (princ compatible)
|
|
|
1141 (terpri)
|
|
|
1142 (terpri))
|
|
|
1143 (unless (and obsolete aliases)
|
|
|
1144 (let ((doc (function-documentation function t)))
|
|
|
1145 (princ "Documentation:\n")
|
|
|
1146 (princ doc)
|
|
|
1147 (unless (or (equal doc "")
|
|
|
1148 (eq ?\n (aref doc (1- (length doc)))))
|
|
|
1149 (terpri)))))))))
|
|
|
1150
|
|
|
1151
|
|
|
1152 ;;; [Obnoxious, whining people who complain very LOUDLY on Usenet
|
|
|
1153 ;;; are binding this to keys.]
|
|
|
1154 (defun describe-function-arglist (function)
|
|
|
1155 (interactive (list (or (function-at-point)
|
|
|
1156 (error "no function call at point"))))
|
|
|
1157 (message nil)
|
|
|
1158 (message (function-arglist function)))
|
|
|
1159
|
|
|
1160
|
|
|
1161 (defun variable-at-point ()
|
|
|
1162 (ignore-errors
|
|
|
1163 (with-syntax-table emacs-lisp-mode-syntax-table
|
|
|
1164 (save-excursion
|
|
|
1165 (or (not (zerop (skip-syntax-backward "_w")))
|
|
|
1166 (eq (char-syntax (char-after (point))) ?w)
|
|
|
1167 (eq (char-syntax (char-after (point))) ?_)
|
|
|
1168 (forward-sexp -1))
|
|
|
1169 (skip-chars-forward "'")
|
|
|
1170 (let ((obj (read (current-buffer))))
|
|
|
1171 (and (symbolp obj) (boundp obj) obj))))))
|
|
|
1172
|
|
|
1173 (defun variable-obsolete-p (variable)
|
|
|
1174 "Return non-nil if VARIABLE is obsolete."
|
|
|
1175 (not (null (get variable 'byte-obsolete-variable))))
|
|
|
1176
|
|
|
1177 (defun variable-obsoleteness-doc (variable)
|
|
|
1178 "If VARIABLE is obsolete, return a string describing this."
|
|
|
1179 (let ((obsolete (get variable 'byte-obsolete-variable)))
|
|
|
1180 (if obsolete
|
|
|
1181 (format "Obsolete; %s"
|
|
|
1182 (if (stringp obsolete)
|
|
|
1183 obsolete
|
|
|
1184 (format "use `%s' instead." obsolete))))))
|
|
|
1185
|
|
|
1186 (defun variable-compatible-p (variable)
|
|
|
1187 "Return non-nil if VARIABLE is Emacs compatible."
|
|
|
1188 (not (null (get variable 'byte-compatible-variable))))
|
|
|
1189
|
|
|
1190 (defun variable-compatibility-doc (variable)
|
|
|
1191 "If VARIABLE is Emacs compatible, return a string describing this."
|
|
|
1192 (let ((compatible (get variable 'byte-compatible-variable)))
|
|
|
1193 (if compatible
|
|
|
1194 (format "Emacs Compatible; %s"
|
|
|
1195 (if (stringp compatible)
|
|
|
1196 compatible
|
|
|
1197 (format "use `%s' instead." compatible))))))
|
|
|
1198
|
|
|
1199 (defun built-in-variable-doc (variable)
|
|
|
1200 "Return a string describing whether VARIABLE is built-in."
|
|
|
1201 (let ((type (built-in-variable-type variable)))
|
|
|
1202 (case type
|
|
|
1203 (integer "a built-in integer variable")
|
|
|
1204 (const-integer "a built-in constant integer variable")
|
|
|
1205 (boolean "a built-in boolean variable")
|
|
|
1206 (const-boolean "a built-in constant boolean variable")
|
|
|
1207 (object "a simple built-in variable")
|
|
|
1208 (const-object "a simple built-in constant variable")
|
|
|
1209 (const-specifier "a built-in constant specifier variable")
|
|
|
1210 (current-buffer "a built-in buffer-local variable")
|
|
|
1211 (const-current-buffer "a built-in constant buffer-local variable")
|
|
|
1212 (default-buffer "a built-in default buffer-local variable")
|
|
|
1213 (selected-console "a built-in console-local variable")
|
|
|
1214 (const-selected-console "a built-in constant console-local variable")
|
|
|
1215 (default-console "a built-in default console-local variable")
|
|
|
1216 (t
|
|
|
1217 (if type "an unknown type of built-in variable?"
|
|
|
1218 "a variable declared in Lisp")))))
|
|
|
1219
|
|
|
1220 (defun describe-variable (variable)
|
|
|
1221 "Display the full documentation of VARIABLE (a symbol)."
|
|
|
1222 (interactive
|
|
|
1223 (let* ((v (variable-at-point))
|
|
|
1224 (val (let ((enable-recursive-minibuffers t))
|
|
|
1225 (completing-read
|
|
|
1226 (if v
|
|
|
1227 (format "Describe variable (default %s): " v)
|
|
|
1228 (gettext "Describe variable: "))
|
|
|
1229 obarray 'boundp t nil 'variable-history))))
|
|
|
1230 (list (if (equal val "") v (intern val)))))
|
|
|
1231 (with-displaying-help-buffer
|
|
|
1232 (lambda ()
|
|
|
1233 (let ((origvar variable)
|
|
|
1234 aliases)
|
|
|
1235 (let ((print-escape-newlines t))
|
|
|
1236 (princ (format "`%s' is " (symbol-name variable)))
|
|
|
1237 (while (variable-alias variable)
|
|
|
1238 (let ((newvar (variable-alias variable)))
|
|
|
1239 (if aliases
|
|
|
1240 ;; I18N3 Need gettext due to concat
|
|
|
1241 (setq aliases
|
|
|
1242 (concat aliases
|
|
|
1243 (format "\n which is an alias for `%s',"
|
|
|
1244 (symbol-name newvar))))
|
|
|
1245 (setq aliases
|
|
|
1246 (format "an alias for `%s',"
|
|
|
1247 (symbol-name newvar))))
|
|
|
1248 (setq variable newvar)))
|
|
|
1249 (if aliases
|
|
|
1250 (princ (format "%s" aliases)))
|
|
|
1251 (princ (built-in-variable-doc variable))
|
|
|
1252 (princ ".\n")
|
|
|
1253 (let ((file-name (describe-symbol-find-file variable)))
|
|
|
1254 (if file-name
|
|
|
1255 (princ (format " -- loaded from \"%s\"\n" file-name))))
|
|
|
1256 (princ "\nValue: ")
|
|
|
1257 (if (not (boundp variable))
|
|
|
1258 (princ "void\n")
|
|
|
1259 (prin1 (symbol-value variable))
|
|
|
1260 (terpri))
|
|
|
1261 (terpri)
|
|
|
1262 (cond ((local-variable-p variable (current-buffer))
|
|
|
1263 (let* ((void (cons nil nil))
|
|
|
1264 (def (condition-case nil
|
|
|
1265 (default-value variable)
|
|
|
1266 (error void))))
|
|
|
1267 (princ "This value is specific to the current buffer.\n")
|
|
|
1268 (if (local-variable-p variable nil)
|
|
|
1269 (princ "(Its value is local to each buffer.)\n"))
|
|
|
1270 (terpri)
|
|
|
1271 (if (if (eq def void)
|
|
|
1272 (boundp variable)
|
|
|
1273 (not (eq (symbol-value variable) def)))
|
|
|
1274 ;; #### I18N3 doesn't localize properly!
|
|
|
1275 (progn (princ "Default-value: ")
|
|
|
1276 (if (eq def void)
|
|
|
1277 (princ "void\n")
|
|
|
1278 (prin1 def)
|
|
|
1279 (terpri))
|
|
|
1280 (terpri)))))
|
|
|
1281 ((local-variable-p variable (current-buffer) t)
|
|
|
1282 (princ "Setting it would make its value buffer-local.\n\n"))))
|
|
|
1283 (princ "Documentation:")
|
|
|
1284 (terpri)
|
|
|
1285 (let ((doc (documentation-property variable 'variable-documentation))
|
|
|
1286 (obsolete (variable-obsoleteness-doc origvar))
|
|
|
1287 (compatible (variable-compatibility-doc origvar)))
|
|
|
1288 (when obsolete
|
|
|
1289 (princ obsolete)
|
|
|
1290 (terpri)
|
|
|
1291 (terpri))
|
|
|
1292 (when compatible
|
|
|
1293 (princ compatible)
|
|
|
1294 (terpri)
|
|
|
1295 (terpri))
|
|
|
1296 ;; don't bother to print anything if variable is obsolete and aliased.
|
|
|
1297 (when (or (not obsolete) (not aliases))
|
|
|
1298 (if doc
|
|
|
1299 ;; note: documentation-property calls substitute-command-keys.
|
|
|
1300 (princ doc)
|
|
|
1301 (princ "not documented as a variable."))))
|
|
|
1302 (terpri)))
|
|
|
1303 (format "variable `%s'" variable)))
|
|
|
1304
|
|
|
1305 (defun sorted-key-descriptions (keys &optional separator)
|
|
|
1306 "Sort and separate the key descriptions for KEYS.
|
|
|
1307 The sorting is done by length (shortest bindings first), and the bindings
|
|
|
1308 are separated with SEPARATOR (\", \" by default)."
|
|
|
1309 (mapconcat 'key-description
|
|
|
1310 (sort keys #'(lambda (x y)
|
|
|
1311 (< (length x) (length y))))
|
|
|
1312 (or separator ", ")))
|
|
|
1313
|
|
|
1314 (defun where-is (definition &optional insert)
|
|
|
1315 "Print message listing key sequences that invoke specified command.
|
|
|
1316 Argument is a command definition, usually a symbol with a function definition.
|
|
|
1317 When run interactively, it defaults to any function found by
|
|
|
1318 `function-at-point'.
|
|
|
1319 If INSERT (the prefix arg) is non-nil, insert the message in the buffer."
|
|
|
1320 (interactive
|
|
|
1321 (let ((fn (function-at-point))
|
|
|
1322 (enable-recursive-minibuffers t)
|
|
|
1323 val)
|
|
|
1324 (setq val (read-command
|
|
|
1325 (if fn (format "Where is command (default %s): " fn)
|
|
|
1326 "Where is command: ")))
|
|
|
1327 (list (if (equal (symbol-name val) "")
|
|
|
1328 fn val)
|
|
|
1329 current-prefix-arg)))
|
|
|
1330 (let ((keys (where-is-internal definition)))
|
|
|
1331 (if keys
|
|
|
1332 (if insert
|
|
|
1333 (princ (format "%s (%s)" (sorted-key-descriptions keys)
|
|
|
1334 definition) (current-buffer))
|
|
|
1335 (message "%s is on %s" definition (sorted-key-descriptions keys)))
|
|
|
1336 (if insert
|
|
|
1337 (princ (format (if (commandp definition) "M-x %s RET"
|
|
|
1338 "M-: (%s ...)") definition) (current-buffer))
|
|
|
1339 (message "%s is not on any keys" definition))))
|
|
|
1340 nil)
|
|
|
1341
|
|
|
1342 ;; `locate-library' moved to "packages.el"
|
|
|
1343
|
|
|
1344
|
|
|
1345 ;; Functions ported from C into Lisp in XEmacs
|
|
|
1346
|
|
|
1347 (defun describe-syntax ()
|
|
|
1348 "Describe the syntax specifications in the syntax table.
|
|
|
1349 The descriptions are inserted in a buffer, which is then displayed."
|
|
|
1350 (interactive)
|
|
|
1351 (with-displaying-help-buffer
|
|
|
1352 (lambda ()
|
|
|
1353 ;; defined in syntax.el
|
|
|
1354 (describe-syntax-table (syntax-table) standard-output))
|
|
|
1355 (format "syntax-table for %s" major-mode)))
|
|
|
1356
|
|
|
1357 (defun list-processes ()
|
|
|
1358 "Display a list of all processes.
|
|
|
1359 \(Any processes listed as Exited or Signaled are actually eliminated
|
|
|
1360 after the listing is made.)"
|
|
|
1361 (interactive)
|
|
|
1362 (with-output-to-temp-buffer "*Process List*"
|
|
|
1363 (set-buffer standard-output)
|
|
|
1364 (buffer-disable-undo standard-output)
|
|
|
1365 (make-local-variable 'truncate-lines)
|
|
|
1366 (setq truncate-lines t)
|
|
|
1367 ;; 00000000001111111111222222222233333333334444444444
|
|
|
1368 ;; 01234567890123456789012345678901234567890123456789
|
|
|
1369 ;; rewritten for I18N3. This one should stay rewritten
|
|
|
1370 ;; so that the dashes will line up properly.
|
|
|
1371 (princ "Proc Status Buffer Tty Command\n---- ------ ------ --- -------\n")
|
|
|
1372 (let ((tail (process-list)))
|
|
|
1373 (while tail
|
|
|
1374 (let* ((p (car tail))
|
|
|
1375 (pid (process-id p))
|
|
|
1376 (s (process-status p)))
|
|
|
1377 (setq tail (cdr tail))
|
|
|
1378 (princ (format "%-13s" (process-name p)))
|
|
|
1379 (princ s)
|
|
|
1380 (if (and (eq s 'exit) (/= (process-exit-status p) 0))
|
|
|
1381 (princ (format " %d" (process-exit-status p))))
|
|
|
1382 (if (memq s '(signal exit closed))
|
|
|
1383 ;; Do delete-exited-processes' work
|
|
|
1384 (delete-process p))
|
|
|
1385 (indent-to 22 1) ;####
|
|
|
1386 (let ((b (process-buffer p)))
|
|
|
1387 (cond ((not b)
|
|
|
1388 (princ "(none)"))
|
|
|
1389 ((not (buffer-name b))
|
|
|
1390 (princ "(killed)"))
|
|
|
1391 (t
|
|
|
1392 (princ (buffer-name b)))))
|
|
|
1393 (indent-to 37 1) ;####
|
|
|
1394 (let ((tn (process-tty-name p)))
|
|
|
1395 (cond ((not tn)
|
|
|
1396 (princ "(none)"))
|
|
|
1397 (t
|
|
|
1398 (princ (format "%s" tn)))))
|
|
|
1399 (indent-to 49 1) ;####
|
|
|
1400 (if (not (integerp pid))
|
|
|
1401 (progn
|
|
|
1402 (princ "network stream connection ")
|
|
|
1403 (princ (car pid))
|
|
|
1404 (princ "@")
|
|
|
1405 (princ (cdr pid)))
|
|
|
1406 (let ((cmd (process-command p)))
|
|
|
1407 (while cmd
|
|
|
1408 (princ (car cmd))
|
|
|
1409 (setq cmd (cdr cmd))
|
|
|
1410 (if cmd (princ " ")))))
|
|
|
1411 (terpri))))))
|
|
|
1412
|
|
|
1413 ;; Stop gap for 21.0 untill we do help-char etc properly.
|
|
|
1414 (defun help-keymap-with-help-key (keymap form)
|
|
|
1415 "Return a copy of KEYMAP with an help-key binding according to help-char
|
|
|
1416 invoking FORM like help-form. An existing binding is not overridden.
|
|
|
1417 If FORM is nil then no binding is made."
|
|
|
1418 (let ((map (copy-keymap keymap))
|
|
|
1419 (key (if (characterp help-char)
|
|
|
1420 (vector (character-to-event help-char))
|
|
|
1421 help-char)))
|
|
|
1422 (when (and form key (not (lookup-key map key)))
|
|
|
1423 (define-key map key
|
|
|
1424 `(lambda () (interactive) (help-print-help-form ,form))))
|
|
|
1425 map))
|
|
|
1426
|
|
|
1427 (defun help-print-help-form (form)
|
|
|
1428 (let ((string (eval form)))
|
|
|
1429 (if (stringp string)
|
|
|
1430 (with-displaying-help-buffer
|
|
|
1431 (insert string)))))
|
|
|
1432
|
|
|
1433
|
|
|
1434 ;;; help.el ends here
|
