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2 @node Help, Mark, M-x, Top
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3 @chapter Help
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4 @kindex Help
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5 @cindex help
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6 @cindex self-documentation
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7 @findex help-command
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8 @kindex C-h
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9 @kindex F1
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10
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11 XEmacs provides extensive help features accessible through a single
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12 character, @kbd{C-h}. @kbd{C-h} is a prefix key that is used only for
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13 documentation-printing commands. The characters that you can type after
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14 @kbd{C-h} are called @dfn{help options}. One help option is @kbd{C-h};
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15 that is how you ask for help about using @kbd{C-h}. To cancel, type
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16 @kbd{C-g}. The function key @key{F1} is equivalent to @kbd{C-h}.
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17
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18 @kindex C-h C-h
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19 @findex help-for-help
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20 @kbd{C-h C-h} (@code{help-for-help}) displays a list of the possible
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21 help options, and then asks you to type the desired option. It prompts
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22 with the string:
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23
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24 @smallexample
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25 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:
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26 @end smallexample
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27
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28 @noindent
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29 You should type one of those characters.
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30
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31 Typing a third @kbd{C-h} displays a description of what the options mean;
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32 Emacs still waits for you to type an option. To cancel, type @kbd{C-g}.
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33
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34 Most help buffers use a special major mode, Help mode, which lets you
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35 scroll conveniently with @key{SPC} and @key{DEL} or @key{BS}.
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36
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37 @menu
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38 * Help Summary:: Brief list of all Help commands.
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39 * Key Help:: Asking what a key does in XEmacs.
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40 * Name Help:: Asking about a command, variable or function name.
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41 * Apropos:: Asking what pertains to a given topic.
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42 * Library Keywords:: Finding Lisp libraries by keywords (topics).
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43 * Help Mode:: Special features of Help mode and Help buffers.
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44 * Misc Help:: Other help commands.
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45 @end menu
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46
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47 @iftex
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48 @node Help Summary, Help Summary, Help, Help
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49 @end iftex
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50 @ifinfo
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51 @node Help Summary, Key Help, Help, Help
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52 @section Help Summary
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53 @end ifinfo
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54
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55 Here is a summary of the defined help commands.
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56
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57 @table @kbd
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58 @item C-h a @var{regexp} @key{RET}
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59 Display a list of functions and variables whose names match @var{regexp}
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60 (@code{hyper-apropos}).
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61 @item C-h A @var{regexp}
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62 Show all commands whose names contain matches for @var{regexp}
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63 (@code{command-apropos}).
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64 @item C-h b
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65 Display a table of all key bindings currently in effect, with local
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66 bindings of the current major mode first, followed by all global
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67 bindings (@code{describe-bindings}).
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68 @item C-h c @var{key}
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69 Print the name of the command that @var{key} runs
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70 (@code{describe-key-briefly}). Here @kbd{c} stands for `character'. For more
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71 extensive information on @var{key}, use @kbd{C-h k}.
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72 @item C-h d @var{function} @key{RET}
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73 @itemx C-h f @var{function} @key{RET}
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74 Display documentation on the Lisp function named @var{function}
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75 (@code{describe-function}). Since commands are Lisp functions,
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76 a command name may be used.
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77 @item C-h i
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78 Run Info, the program for browsing documentation files (@code{info}).
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79 The complete XEmacs manual is available online in Info.
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80 @item C-h k @var{key}
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81 Display the name and documentation of the command that @var{key} runs
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82 (@code{describe-key}).
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83 @item C-h l
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84 Display a description of the last 100 characters you typed
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85 (@code{view-lossage}).
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86 @item C-h m
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87 Display documentation of the current major mode (@code{describe-mode}).
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88 @item C-h n
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89 @itemx C-h C-n
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90 Display documentation of XEmacs changes, most recent first
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91 (@code{view-emacs-news}).
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92 @item C-h p
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93 Find packages by topic keyword (@code{finder-by-keyword}).
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94 @item C-h C-p
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95 Display a table of all mouse bindings currently in effect now, with
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96 local bindings of the current major mode first, followed by all global
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97 bindings (@code{describe-pointer}).
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98 @item C-h s
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99 Display current contents of the syntax table, plus an explanation of
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100 what they mean (@code{describe-syntax}). @xref{Syntax}.
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101 @item C-h t
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102 Enter the XEmacs interactive tutorial (@code{help-with-tutorial}).
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103 @item C-h v @var{var} @key{RET}
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104 Display the documentation of the Lisp variable @var{var}
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105 (@code{describe-variable}).
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106 @item C-h w @var{command} @key{RET}
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107 Print which keys run the command named @var{command} (@code{where-is}).
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108 @item C-h B @key{RET}
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109 Display info on how to deal with Beta versions of XEmacs
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110 (@code{describe-beta}).
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111 @item C-h C @var{group} @key{RET}
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112 Select customization buffer for @var{group} (@code{customize}).
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113 @item C-h F @key{RET}
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114 View the local copy of the XEmacs FAQ (@code{xemacs-local-faq}).
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115 @item C-h C-i @var{file} @key{RET}
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116 Read Info file @var{file} with Info browser (@code{Info-query}).
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117 @item C-h C-c @var{command} @key{RET}
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118 Look up an Emacs command @var{command} in the Emacs manual in the Info
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119 system (@code{Info-goto-emacs-command-node}).
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120 @item C-h C-f @var{function} @key{RET}
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121 Look up an Emacs Lisp function @var{function} in the Elisp manual in the
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122 Info system (@code{Info-elisp-ref}).
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123 @end table
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124
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125 @node Key Help, Name Help, Help Summary, Help
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126 @section Documentation for a Key
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127
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128 @kindex C-h c
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129 @findex describe-key-briefly
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130 The most basic @kbd{C-h} options are @kbd{C-h c}
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131 (@code{describe-key-briefly}) and @w{@kbd{C-h k}} (@code{describe-key}).
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132 @kbd{C-h c @var{key}} prints in the echo area the name of the command
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133 that @var{key} is bound to. For example, @kbd{C-h c C-f} prints
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134 @samp{forward-char}. Since command names are chosen to describe what
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135 the commands do, this is a good way to get a very brief description of
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136 what @var{key} does.
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137
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138 @kindex C-h k
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139 @findex describe-key
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140 @kbd{C-h k @var{key}} is similar to @kbd{C-h c} but gives more
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141 information. It displays the documentation string of the function
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142 @var{key} is bound to as well as its name. @var{key} is a string or
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143 vector of events. When called interactively, @var{key} may also be a menu
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144 selection. This information does not usually fit into the echo area, so a
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145 window is used for the display.
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146
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147 @kbd{C-h c} and @kbd{C-h k} work for any sort of key sequences,
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148 including function keys and mouse events.
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149
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150 @node Name Help, Apropos, Key Help, Help
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151 @section Help by Command or Variable Name
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152
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153 @kindex C-h f
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154 @findex describe-function
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155 @vindex describe-function-show-arglist
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156 @kbd{C-h f} (@code{describe-function}) reads the name of a Lisp
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157 function using the minibuffer, then displays that function's
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158 documentation string in a window. Since commands are Lisp functions,
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159 you can use the argument @var{function} to get the documentation of a
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160 command that you know by name. For example,
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161
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162 @example
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163 C-h f auto-fill-mode @key{RET}
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164 @end example
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165
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166 @noindent
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167 displays the documentation for @code{auto-fill-mode}. Using @kbd{C-h f}
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168 is the only way to see the documentation of a command that is not bound
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169 to any key, that is, a command you would normally call using @kbd{M-x}.
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170 If the variable @code{describe-function-show-arglist} is @code{t},
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171 @code{describe-function} shows its arglist if the @var{function} is not
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172 an autoload function.
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173
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174 @kbd{C-h f} is also useful for Lisp functions that you are planning to
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175 use in a Lisp program. For example, if you have just written the
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176 expression @code{(make-vector len)} and want to make sure you are using
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177 @code{make-vector} properly, type @kbd{C-h f make-vector @key{RET}}.
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178 Because @kbd{C-h f} allows all function names, not just command names,
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179 you may find that some of your favorite abbreviations that work in
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180 @kbd{M-x} don't work in @kbd{C-h f}. An abbreviation may be unique
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181 among command names, yet fail to be unique when other function names are
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182 allowed.
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183
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184 The function name for @kbd{C-h f} to describe has a default which is
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185 used if you type @key{RET} leaving the minibuffer empty. The default is
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186 the function called by the innermost Lisp expression in the buffer
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187 around point, @emph{provided} that is a valid, defined Lisp function
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188 name. For example, if point is located following the text
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189 @samp{(make-vector (car x)}, the innermost list containing point is the
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190 one that starts with @samp{(make-vector}, so the default is to describe the
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191 function @code{make-vector}.
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192
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193 @kbd{C-h f} is often useful just to verify that you have the right
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194 spelling for the function name. If @kbd{C-h f} mentions a name from the
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195 buffer as the default, that name must be defined as a Lisp function. If
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196 that is all you want to know, just type @kbd{C-g} to cancel the @kbd{C-h
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197 f} command, then go on editing.
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198
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199 @kindex C-h w
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200 @findex where-is
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201 @kbd{C-h w @var{command} @key{RET}} (@code{where-is}) tells you what
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202 keys are bound to @var{command}. It prints a list of the keys in the
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203 echo area. Alternatively, it informs you that a command is not bound to
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204 any keys, which implies that you must use @kbd{M-x} to call the
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205 command.
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206
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207 @kindex C-h v
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208 @findex describe-variable
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209 @kbd{C-h v} (@code{describe-variable}) is like @kbd{C-h f} but
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210 describes Lisp variables instead of Lisp functions. Its default is the
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211 Lisp symbol around or before point, if that is the name of a known Lisp
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212 variable. @xref{Variables}.
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213
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214 @node Apropos, Library Keywords, Name Help, Help
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215 @section Apropos
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216
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217 @kindex C-h A
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218 @findex command-apropos
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219 @cindex apropos
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220
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221 @table @kbd
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222 @item C-h A
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223 Show only symbols that are names of commands
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224 (@code{command-apropos}).
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225
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226 @item M-x apropos @var{regexp}
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227 Show all symbols whose names contain matches for @var{regexp}.
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228 @end table
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229
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230 A more sophisticated sort of question to ask is, ``What are the
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231 commands for working with files?'' To ask this question, type @kbd{C-h
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232 a file @key{RET}}, which displays a list of all command names that
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233 contain @samp{file}, including @code{copy-file}, @code{find-file}, and
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234 so on. With each command name appears a brief description of how to use
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235 the command, and what keys you can currently invoke it with. For
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236 example, it would say that you can invoke @code{find-file} by typing
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237 @kbd{C-x C-f}. The @kbd{A} in @kbd{C-h A} stands for `Apropos';
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238 @kbd{C-h A} runs the command @code{command-apropos}. This command
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239 normally checks only commands (interactive functions); if you specify a
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240 prefix argument, it checks noninteractive functions as well.
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241
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242 Because @kbd{C-h A} looks only for functions whose names contain the
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243 string you specify, you must use ingenuity in choosing the string. If
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244 you are looking for commands for killing backwards and @kbd{C-h a
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245 kill-backwards @key{RET}} doesn't reveal any, don't give up. Try just
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246 @kbd{kill}, or just @kbd{backwards}, or just @kbd{back}. Be persistent.
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247 Pretend you are playing Adventure. Also note that you can use a regular
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248 expression as the argument, for more flexibility (@pxref{Regexps}).
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249
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250 Here is a set of arguments to give to @kbd{C-h a} that covers many
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251 classes of XEmacs commands, since there are strong conventions for
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252 naming the standard XEmacs commands. By giving you a feel for the
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253 naming conventions, this set should also serve to aid you in developing
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254 a technique for picking @code{apropos} strings.
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255
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256 @quotation
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257 char, line, word, sentence, paragraph, region, page, sexp, list, defun,
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258 rect, buffer, frame, window, face, file, dir, register, mode, beginning,
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259 end, forward, backward, next, previous, up, down, search, goto, kill,
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260 delete, mark, insert, yank, fill, indent, case, change, set, what, list,
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261 find, view, describe, default.
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262 @end quotation
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263
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264 @findex apropos
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265 To list all Lisp symbols that contain a match for a regexp, not just
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266 the ones that are defined as commands, use the command @kbd{M-x apropos}
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267 instead of @kbd{C-h A}. This command does not check key bindings by
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268 default; specify a numeric argument if you want it to check them.
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269
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270 @findex apropos-documentation
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271 The @code{apropos-documentation} command is like @code{apropos} except
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272 that it searches documentation strings for matches for the specified
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273 regular expression.
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274
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275 @findex apropos-value
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276 The @code{apropos-value} command is like @code{apropos} except that it
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277 searches symbols' values for matches for the specified regular
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278 expression. This command does not check function definitions or
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279 property lists by default; specify a numeric argument if you want it to
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280 check them.
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281
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282 @vindex apropos-do-all
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283 If the variable @code{apropos-do-all} is non-@code{nil}, the commands
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284 above all behave as if they had been given a prefix argument.
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285
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286 If you want more information about a function definition, variable or
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287 symbol property listed in the Apropos buffer, you can click on it with
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288 @kbd{Mouse-2} or move there and type @key{RET}.
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289
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290 @node Library Keywords, Help Mode, Apropos, Help
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291 @section Keyword Search for Lisp Libraries
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292
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293 @kindex C-h p
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294 @findex finder-by-keyword
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295 The @kbd{C-h p} command lets you search the standard Emacs Lisp
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296 libraries by topic keywords. Here is a partial list of keywords you can
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297 use:
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298
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299 @display
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300 abbrev abbreviation handling, typing shortcuts, macros
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301 bib code related to the `bib' bibliography processor
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302 c C, C++, and Objective-C language support
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303 calendar calendar and time management support
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304 comm communications, networking, remote access to files
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305 data support for editing files of data
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306 docs support for Emacs documentation
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307 dumped files preloaded into Emacs
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308 emulations emulations of other editors
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309 extensions Emacs Lisp language extensions
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310 faces support for multiple fonts
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311 frames support for Emacs frames and window systems
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312 games games, jokes and amusements
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313 hardware support for interfacing with exotic hardware
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314 help support for on-line help systems
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315 hypermedia support for links between text or other media types
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316 i18n internationalization and alternate character-set support
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317 internal code for Emacs internals, build process, defaults
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318 languages specialized modes for editing programming languages
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319 lisp Lisp support, including Emacs Lisp
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320 local code local to your site
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321 maint maintenance aids for the Emacs development group
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322 mail modes for electronic-mail handling
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323 matching various sorts of searching and matching
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324 mouse mouse support
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325 mule multi-language extensions
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326 news support for netnews reading and posting
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327 oop support for object-oriented programming
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328 outlines support for hierarchical outlining
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329 processes process, subshell, compilation, and job control support
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330 terminals support for terminal types
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331 tex code related to the TeX formatter
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332 tools programming tools
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333 unix front-ends/assistants for, or emulators of, UNIX features
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334 vms support code for vms
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335 wp word processing
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336 @end display
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337
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338 @node Help Mode, Misc Help, Library Keywords, Help
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339 @section Help Mode Commands
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340
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341 Help buffers provide the commands of View mode (@pxref{Misc File
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342 Ops}), plus a few special commands of their own.
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343
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344 @table @kbd
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345 @item @key{SPC}
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346 Scroll forward.
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347 @item @key{DEL}
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348 @itemx @key{BS}
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349 Scroll backward.
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350 @c @item @key{RET}
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351 @c Follow a cross reference at point.
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352 @c @item @key{TAB}
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353 @c Move point forward to the next cross reference.
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354 @c @item S-@key{TAB}
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355 @c Move point back to the previous cross reference.
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356 @c @item Mouse-2
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357 @c Follow a cross reference that you click on.
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358 @end table
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359
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360 When a command name (@pxref{M-x,, Running Commands by Name}) or
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361 variable name (@pxref{Variables}) appears in the documentation, it
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362 normally appears inside paired single-quotes.
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363
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364 @node Misc Help, , Help Mode, Help
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0
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365 @section Other Help Commands
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366
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367 @kindex C-h i
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368 @findex info
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442
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369 @cindex Info
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370 @cindex manuals, on-line
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371 @cindex on-line manuals
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0
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372 @kbd{C-h i} (@code{info}) runs the Info program, which is used for
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442
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373 browsing through structured documentation files. The entire XEmacs manual
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0
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374 is available within Info. Eventually all the documentation of the GNU
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375 system will be available. Type @kbd{h} after entering Info to run
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376 a tutorial on using Info.
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377
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442
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378 If you specify a numeric argument, @kbd{C-h i} prompts for the name of
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379 a documentation file. This way, you can browse a file which doesn't
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380 have an entry in the top-level Info menu. It is also handy when you
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381 need to get to the documentation quickly, and you know the exact name of
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382 the file.
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383
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384 @kindex C-h C-f
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385 @kindex C-h C-k
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386 @findex Info-elisp-ref
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387 @findex Info-goto-emacs-command-node
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2215
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388 @findex Info-goto-emacs-key-command-node
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442
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389 There are two special help commands for accessing XEmacs documentation
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390 through Info. @kbd{C-h C-f @var{function} @key{RET}} enters Info and
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391 goes straight to the documentation of the XEmacs function
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392 @var{function}. @kbd{C-h C-k @var{key}} enters Info and goes straight
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393 to the documentation of the key @var{key}. These two keys run the
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394 commands @code{Info-elisp-ref} and
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2215
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395 @code{Info-goto-emacs-key-command-node}. (GNU Emacs binds @kbd{C-h C-f}
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396 to @code{Info-goto-emacs-command-node}, but this is less helpful to
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397 programmers.)
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442
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398
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0
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399 @kindex C-h l
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400 @findex view-lossage
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401 If something surprising happens, and you are not sure what commands you
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402 typed, use @kbd{C-h l} (@code{view-lossage}). @kbd{C-h l} prints the last
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442
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403 100 command characters you typed in. If you see commands that you don't
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404 know, you can use @kbd{C-h c} to find out what they do.
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0
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405
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406 @kindex C-h m
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407 @findex describe-mode
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442
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408 XEmacs has several major modes. Each mode redefines a few keys and
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0
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409 makes a few other changes in how editing works. @kbd{C-h m}
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410 (@code{describe-mode}) prints documentation on the current major mode,
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411 which normally describes all the commands that are changed in this mode.
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412
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413 @kindex C-h b
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414 @findex describe-bindings
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415 @kbd{C-h b} (@code{describe-bindings}) and @kbd{C-h s}
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442
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416 (@code{describe-syntax}) present information about the current XEmacs
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0
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417 mode that is not covered by @kbd{C-h m}. @kbd{C-h b} displays a list of
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442
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418 all the key bindings currently in effect, with the local bindings of the
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419 current major mode first, followed by the global bindings (@pxref{Key
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0
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420 Bindings}). @kbd{C-h s} displays the contents of the syntax table with
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442
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421 explanations of each character's syntax (@pxref{Syntax}).
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0
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422
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442
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423 You can get a similar list for a particular prefix key by typing
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424 @kbd{C-h} after the prefix key. (There are a few prefix keys for which
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425 this does not work---those that provide their own bindings for
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426 @kbd{C-h}. One of these is @key{ESC}, because @kbd{@key{ESC} C-h} is
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427 actually @kbd{C-M-h}, which marks a defun.)
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428
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429 @kindex C-h F
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430 @findex xemacs-local-faq
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0
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431 @kindex C-h n
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432 @findex view-emacs-news
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433 @kindex C-h t
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434 @findex help-with-tutorial
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435 @kindex C-h C-c
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436 @findex describe-copying
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437 @kindex C-h C-d
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438 @findex describe-distribution
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439 @kindex C-h C-w
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440 @findex describe-no-warranty
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441 The other @kbd{C-h} options display various files of useful
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442
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442 information. @kbd{C-h C-w} (@code{describe-no-warranty}) displays the
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443 full details on the complete absence of warranty for XEmacs. @kbd{C-h
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444 n} (@code{view-emacs-news}) displays the file @file{xemacs/etc/NEWS},
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2537
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445 which contains documentation on XEmacs changes arranged
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446 chronologically. @kbd{C-h F} (@code{xemacs-local-faq}) displays the
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447 local version of the XEmacs FAQ (Frequently Answered Questions list).
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448 @kbd{C-h t} (@code{help-with-tutorial}) displays the learn-by-doing
|
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449 XEmacs tutorial. @kbd{C-h C-c} (@code{describe-copying}) displays the
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450 file @file{xemacs/etc/COPYING}, which tells you the conditions you
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451 must obey in distributing copies of XEmacs. @kbd{C-h C-d}
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452 (@code{describe-distribution} displays the section of the FAQ that
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453 tells you how you can get the latest version of XEmacs.
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