annotate runtime/doc/helphelp.txt @ 2316:db0ea641e382 vim73

Fix: cursor line not properly concealed when moving between windows. (Vince Negri)
author Bram Moolenaar <bram@vim.org>
date Wed, 14 Jul 2010 20:57:00 +0200
parents c08f91142c41
children 12b829477c60
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 *helphelp.txt* For Vim version 7.3a. Last change: 2008 Jul 21
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2
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3
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4 VIM REFERENCE MANUAL by Bram Moolenaar
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5
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6
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7 Help on help files *helphelp*
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8
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9 1. Help commands |online-help|
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10 2. Translating help files |help-translated|
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11 3. Writing help files |help-writing|
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12
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13 ==============================================================================
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14 1. Help commands *online-help*
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15
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16 *help* *<Help>* *:h* *:help* *<F1>* *i_<F1>* *i_<Help>*
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17 <Help> or
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18 :h[elp] Open a window and display the help file in read-only
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19 mode. If there is a help window open already, use
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20 that one. Otherwise, if the current window uses the
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21 full width of the screen or is at least 80 characters
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22 wide, the help window will appear just above the
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23 current window. Otherwise the new window is put at
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24 the very top.
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25 The 'helplang' option is used to select a language, if
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26 the main help file is available in several languages.
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27 {not in Vi}
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28
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29 *{subject}* *E149* *E661*
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30 :h[elp] {subject} Like ":help", additionally jump to the tag {subject}.
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31 {subject} can include wildcards like "*", "?" and
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32 "[a-z]":
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33 :help z? jump to help for any "z" command
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34 :help z. jump to the help for "z."
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35 If there is no full match for the pattern, or there
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36 are several matches, the "best" match will be used.
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37 A sophisticated algorithm is used to decide which
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38 match is better than another one. These items are
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39 considered in the computation:
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40 - A match with same case is much better than a match
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41 with different case.
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42 - A match that starts after a non-alphanumeric
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43 character is better than a match in the middle of a
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44 word.
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45 - A match at or near the beginning of the tag is
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46 better than a match further on.
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47 - The more alphanumeric characters match, the better.
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48 - The shorter the length of the match, the better.
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49
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50 The 'helplang' option is used to select a language, if
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51 the {subject} is available in several languages.
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52 To find a tag in a specific language, append "@ab",
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53 where "ab" is the two-letter language code. See
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54 |help-translated|.
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55
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56 Note that the longer the {subject} you give, the less
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57 matches will be found. You can get an idea how this
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58 all works by using commandline completion (type CTRL-D
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59 after ":help subject" |c_CTRL-D|).
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60 If there are several matches, you can have them listed
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61 by hitting CTRL-D. Example: >
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62 :help cont<Ctrl-D>
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63 < To use a regexp |pattern|, first do ":help" and then
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64 use ":tag {pattern}" in the help window. The
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65 ":tnext" command can then be used to jump to other
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66 matches, "tselect" to list matches and choose one. >
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67 :help index| :tse z.
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68 < When there is no argument you will see matches for
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69 "help", to avoid listing all possible matches (that
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70 would be very slow).
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71 The number of matches displayed is limited to 300.
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72
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73 This command can be followed by '|' and another
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74 command, but you don't need to escape the '|' inside a
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75 help command. So these both work: >
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76 :help |
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77 :help k| only
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78 < Note that a space before the '|' is seen as part of
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79 the ":help" argument.
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80 You can also use <LF> or <CR> to separate the help
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81 command from a following command. You need to type
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82 CTRL-V first to insert the <LF> or <CR>. Example: >
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83 :help so<C-V><CR>only
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84 < {not in Vi}
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85
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86 :h[elp]! [subject] Like ":help", but in non-English help files prefer to
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87 find a tag in a file with the same language as the
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88 current file. See |help-translated|.
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89
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90 *:helpg* *:helpgrep*
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91 :helpg[rep] {pattern}[@xx]
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92 Search all help text files and make a list of lines
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93 in which {pattern} matches. Jumps to the first match.
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94 The optional [@xx] specifies that only matches in the
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95 "xx" language are to be found.
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96 You can navigate through the matches with the
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97 |quickfix| commands, e.g., |:cnext| to jump to the
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98 next one. Or use |:cwindow| to get the list of
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99 matches in the quickfix window.
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100 {pattern} is used as a Vim regexp |pattern|.
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101 'ignorecase' is not used, add "\c" to ignore case.
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102 Example for case sensitive search: >
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103 :helpgrep Uganda
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104 < Example for case ignoring search: >
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105 :helpgrep uganda\c
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106 < Example for searching in French help: >
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107 :helpgrep backspace@fr
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108 < The pattern does not support line breaks, it must
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109 match within one line. You can use |:grep| instead,
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110 but then you need to get the list of help files in a
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111 complicated way.
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112 Cannot be followed by another command, everything is
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113 used as part of the pattern. But you can use
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114 |:execute| when needed.
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115 Compressed help files will not be searched (Fedora
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116 compresses the help files).
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117 {not in Vi}
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118
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119 *:lh* *:lhelpgrep*
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120 :lh[elpgrep] {pattern}[@xx]
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121 Same as ":helpgrep", except the location list is used
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122 instead of the quickfix list. If the help window is
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123 already opened, then the location list for that window
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124 is used. Otherwise, a new help window is opened and
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125 the location list for that window is set. The
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126 location list for the current window is not changed.
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127
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128 *:exu* *:exusage*
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129 :exu[sage] Show help on Ex commands. Added to simulate the Nvi
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130 command. {not in Vi}
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131
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132 *:viu* *:viusage*
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133 :viu[sage] Show help on Normal mode commands. Added to simulate
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134 the Nvi command. {not in Vi}
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135
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136 When no argument is given to |:help| the file given with the 'helpfile' option
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137 will be opened. Otherwise the specified tag is searched for in all "doc/tags"
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138 files in the directories specified in the 'runtimepath' option.
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139
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140 The initial height of the help window can be set with the 'helpheight' option
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141 (default 20).
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142
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143 Jump to specific subjects by using tags. This can be done in two ways:
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144 - Use the "CTRL-]" command while standing on the name of a command or option.
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145 This only works when the tag is a keyword. "<C-Leftmouse>" and
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146 "g<LeftMouse>" work just like "CTRL-]".
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147 - use the ":ta {subject}" command. This also works with non-keyword
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148 characters.
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149
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150 Use CTRL-T or CTRL-O to jump back.
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151 Use ":q" to close the help window.
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152
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153 If there are several matches for an item you are looking for, this is how you
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154 can jump to each one of them:
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155 1. Open a help window
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156 2. Use the ":tag" command with a slash prepended to the tag. E.g.: >
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157 :tag /min
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158 3. Use ":tnext" to jump to the next matching tag.
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159
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160 It is possible to add help files for plugins and other items. You don't need
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161 to change the distributed help files for that. See |add-local-help|.
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162
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163 To write a local help file, see |write-local-help|.
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164
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165 Note that the title lines from the local help files are automagically added to
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166 the "LOCAL ADDITIONS" section in the "help.txt" help file |local-additions|.
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167 This is done when viewing the file in Vim, the file itself is not changed. It
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168 is done by going through all help files and obtaining the first line of each
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169 file. The files in $VIMRUNTIME/doc are skipped.
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170
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171 *help-xterm-window*
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172 If you want to have the help in another xterm window, you could use this
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173 command: >
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174 :!xterm -e vim +help &
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175 <
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176
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177 *:helpfind* *:helpf*
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178 :helpf[ind] Like |:help|, but use a dialog to enter the argument.
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179 Only for backwards compatibility. It now executes the
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180 ToolBar.FindHelp menu entry instead of using a builtin
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181 dialog. {only when compiled with |+GUI_GTK|}
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182 < {not in Vi}
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183
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184 *:helpt* *:helptags*
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185 *E154* *E150* *E151* *E152* *E153* *E670*
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186 :helpt[ags] [++t] {dir}
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187 Generate the help tags file(s) for directory {dir}.
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188 All "*.txt" and "*.??x" files in the directory are
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189 scanned for a help tag definition in between stars.
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190 The "*.??x" files are for translated docs, they
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191 generate the "tags-??" file, see |help-translated|.
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192 The generated tags files are sorted.
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193 When there are duplicates an error message is given.
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194 An existing tags file is silently overwritten.
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195 The optional "++t" argument forces adding the
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196 "help-tags" tag. This is also done when the {dir} is
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197 equal to $VIMRUNTIME/doc.
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198 To rebuild the help tags in the runtime directory
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199 (requires write permission there): >
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200 :helptags $VIMRUNTIME/doc
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201 < {not in Vi}
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202
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203
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204 ==============================================================================
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205 2. Translated help files *help-translated*
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206
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207 It is possible to add translated help files, next to the original English help
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208 files. Vim will search for all help in "doc" directories in 'runtimepath'.
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209 This is only available when compiled with the |+multi_lang| feature.
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210
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211 At this moment translations are available for:
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212 Chinese - multiple authors
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213 French - translated by David Blanchet
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214 Italian - translated by Antonio Colombo
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215 Polish - translated by Mikolaj Machowski
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216 Russian - translated by Vassily Ragosin
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217 See the Vim website to find them: http://www.vim.org/translations.php
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218
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219 A set of translated help files consists of these files:
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220
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221 help.abx
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222 howto.abx
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223 ...
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224 tags-ab
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225
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226 "ab" is the two-letter language code. Thus for Italian the names are:
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227
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228 help.itx
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229 howto.itx
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230 ...
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231 tags-it
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232
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233 The 'helplang' option can be set to the preferred language(s). The default is
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234 set according to the environment. Vim will first try to find a matching tag
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235 in the preferred language(s). English is used when it cannot be found.
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236
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237 To find a tag in a specific language, append "@ab" to a tag, where "ab" is the
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238 two-letter language code. Example: >
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239 :he user-manual@it
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240 :he user-manual@en
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241 The first one finds the Italian user manual, even when 'helplang' is empty.
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242 The second one finds the English user manual, even when 'helplang' is set to
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243 "it".
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244
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245 When using command-line completion for the ":help" command, the "@en"
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246 extension is only shown when a tag exists for multiple languages. When the
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247 tag only exists for English "@en" is omitted.
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248
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249 When using |CTRL-]| or ":help!" in a non-English help file Vim will try to
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250 find the tag in the same language. If not found then 'helplang' will be used
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251 to select a language.
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252
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253 Help files must use latin1 or utf-8 encoding. Vim assumes the encoding is
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254 utf-8 when finding non-ASCII characters in the first line. Thus you must
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255 translate the header with "For Vim version".
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256
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257 The same encoding must be used for the help files of one language in one
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258 directory. You can use a different encoding for different languages and use
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259 a different encoding for help files of the same language but in a different
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260 directory.
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261
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262 Hints for translators:
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263 - Do not translate the tags. This makes it possible to use 'helplang' to
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264 specify the preferred language. You may add new tags in your language.
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265 - When you do not translate a part of a file, add tags to the English version,
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266 using the "tag@en" notation.
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267 - Make a package with all the files and the tags file available for download.
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268 Users can drop it in one of the "doc" directories and start use it.
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269 Report this to Bram, so that he can add a link on www.vim.org.
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270 - Use the |:helptags| command to generate the tags files. It will find all
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271 languages in the specified directory.
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272
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273 ==============================================================================
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274 3. Writing help files *help-writing*
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275
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276 For ease of use, a Vim help file for a plugin should follow the format of the
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277 standard Vim help files. If you are writing a new help file it's best to copy
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278 one of the existing files and use it as a template.
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279
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280 The first line in a help file should have the following format:
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281
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282 *helpfile_name.txt* For Vim version 7.3 Last change: 2010 June 4
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283
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284 The first field is a link to the help file name. The second field describes
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285 the applicable Vim version. The last field specifies the last modification
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286 date of the file. Each field is separated by a tab.
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287
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288 At the bottom of the help file, place a Vim modeline to set the 'textwidth'
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289 and 'tabstop' options and the 'filetype' to 'help'. Never set a global option
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290 in such a modeline, that can have consequences undesired by whoever reads that
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291 help.
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292
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293
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294 TAGS
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295
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296 To define a help tag, place the name between asterisks (*tag-name*). The
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297 tag-name should be different from all the Vim help tag names and ideally
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298 should begin with the name of the Vim plugin. The tag name is usually right
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299 aligned on a line.
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300
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301 When referring to an existing help tag and to create a hot-link, place the
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302 name between two bars (|) eg. |help-writing|.
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303
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304 When referring to a Vim option in the help file, place the option name between
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305 two single quotes, eg. 'statusline'
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306
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307
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308 HIGHLIGHTING
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309
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310 To define a column heading, use a tilde character at the end of the line.
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311 This will highlight the column heading in a different color. E.g.
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312
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313 Column heading~
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314
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315 To separate sections in a help file, place a series of '=' characters in a
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316 line starting from the first column. The section separator line is highlighted
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317 differently.
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318
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319 To quote a block of ex-commands verbatim, place a greater than (>) character
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320 at the end of the line before the block and a less than (<) character as the
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321 first non-blank on a line following the block. Any line starting in column 1
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322 also implicitly stops the block of ex-commands before it. E.g. >
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323 function Example_Func()
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324 echo "Example"
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325 endfunction
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326 <
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327
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328 The following are highlighted differently in a Vim help file:
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329 - a special key name expressed either in <> notation as in <PageDown>, or
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330 as a Ctrl character as in CTRL-X
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331 - anything between {braces}, e.g. {lhs} and {rhs}
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332
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333 The word "Note", "Notes" and similar automagically receive distinctive
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334 highlighting. So do these:
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335 *Todo something to do
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336 *Error something wrong
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337
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338 You can find the details in $VIMRUNTIME/syntax/help.vim
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339
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340 vim:tw=78:ts=8:ft=help:norl: