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helphelp.txt
*helphelp.txt* For Vim version 8.0. Last change: 2017 Mar 19 VIM REFERENCE MANUAL by Bram Moolenaar Help on help files *helphelp* 1. Help commands |online-help| 2. Translated help files |help-translated| 3. Writing help files |help-writing| ============================================================================== 1. Help commands *online-help* *help* *<Help>* *:h* *:help* *<F1>* *i_<F1>* *i_<Help>* <Help> or :h[elp] Open a window and display the help file in read-only mode. If there is a help window open already, use that one. Otherwise, if the current window uses the full width of the screen or is at least 80 characters wide, the help window will appear just above the current window. Otherwise the new window is put at the very top. The 'helplang' option is used to select a language, if the main help file is available in several languages. {not in Vi} *{subject}* *E149* *E661* :h[elp] {subject} Like ":help", additionally jump to the tag {subject}. For example: > :help options < {subject} can include wildcards such as "*", "?" and "[a-z]": :help z? jump to help for any "z" command :help z. jump to the help for "z." But when a tag exists it is taken literally: :help :? jump to help for ":?" If there is no full match for the pattern, or there are several matches, the "best" match will be used. A sophisticated algorithm is used to decide which match is better than another one. These items are considered in the computation: - A match with same case is much better than a match with different case. - A match that starts after a non-alphanumeric character is better than a match in the middle of a word. - A match at or near the beginning of the tag is better than a match further on. - The more alphanumeric characters match, the better. - The shorter the length of the match, the better. The 'helplang' option is used to select a language, if the {subject} is available in several languages. To find a tag in a specific language, append "@ab", where "ab" is the two-letter language code. See |help-translated|. Note that the longer the {subject} you give, the less matches will be found. You can get an idea how this all works by using commandline completion (type CTRL-D after ":help subject" |c_CTRL-D|). If there are several matches, you can have them listed by hitting CTRL-D. Example: > :help cont<Ctrl-D> < Instead of typing ":help CTRL-V" to search for help for CTRL-V you can type: > :help ^V < This also works together with other characters, for example to find help for CTRL-V in Insert mode: > :help i^V < It is also possible to first do ":help" and then use ":tag {pattern}" in the help window. The ":tnext" command can then be used to jump to other matches, "tselect" to list matches and choose one. > :help index :tselect /.*mode < When there is no argument you will see matches for "help", to avoid listing all possible matches (that would be very slow). The number of matches displayed is limited to 300. The `:help` command can be followed by '|' and another command, but you don't need to escape the '|' inside a help command. So these both work: > :help | :help k| only < Note that a space before the '|' is seen as part of the ":help" argument. You can also use <LF> or <CR> to separate the help command from a following command. You need to type CTRL-V first to insert the <LF> or <CR>. Example: > :help so<C-V><CR>only < {not in Vi} :h[elp]! [subject] Like ":help", but in non-English help files prefer to find a tag in a file with the same language as the current file. See |help-translated|. *:helpc* *:helpclose* :helpc[lose] Close one help window, if there is one. *:helpg* *:helpgrep* :helpg[rep] {pattern}[@xx] Search all help text files and make a list of lines in which {pattern} matches. Jumps to the first match. The optional [@xx] specifies that only matches in the "xx" language are to be found. You can navigate through the matches with the |quickfix| commands, e.g., |:cnext| to jump to the next one. Or use |:cwindow| to get the list of matches in the quickfix window. {pattern} is used as a Vim regexp |pattern|. 'ignorecase' is not used, add "\c" to ignore case. Example for case sensitive search: > :helpgrep Uganda < Example for case ignoring search: > :helpgrep uganda\c < Example for searching in French help: > :helpgrep backspace@fr < The pattern does not support line breaks, it must match within one line. You can use |:grep| instead, but then you need to get the list of help files in a complicated way. Cannot be followed by another command, everything is used as part of the pattern. But you can use |:execute| when needed. Compressed help files will not be searched (Fedora compresses the help files). {not in Vi} *:lh* *:lhelpgrep* :lh[elpgrep] {pattern}[@xx] Same as ":helpgrep", except the location list is used instead of the quickfix list. If the help window is already opened, then the location list for that window is used. Otherwise, a new help window is opened and the location list for that window is set. The location list for the current window is not changed then. *:exu* *:exusage* :exu[sage] Show help on Ex commands. Added to simulate the Nvi command. {not in Vi} *:viu* *:viusage* :viu[sage] Show help on Normal mode commands. Added to simulate the Nvi command. {not in Vi} When no argument is given to |:help| the file given with the 'helpfile' option will be opened. Otherwise the specified tag is searched for in all "doc/tags" files in the directories specified in the 'runtimepath' option. The initial height of the help window can be set with the 'helpheight' option (default 20). Jump to specific subjects by using tags. This can be done in two ways: - Use the "CTRL-]" command while standing on the name of a command or option. This only works when the tag is a keyword. "<C-Leftmouse>" and "g<LeftMouse>" work just like "CTRL-]". - use the ":ta {subject}" command. This also works with non-keyword characters. Use CTRL-T or CTRL-O to jump back. Use ":q" to close the help window. If there are several matches for an item you are looking for, this is how you can jump to each one of them: 1. Open a help window 2. Use the ":tag" command with a slash prepended to the tag. E.g.: > :tag /min 3. Use ":tnext" to jump to the next matching tag. It is possible to add help files for plugins and other items. You don't need to change the distributed help files for that. See |add-local-help|. To write a local help file, see |write-local-help|. Note that the title lines from the local help files are automagically added to the "LOCAL ADDITIONS" section in the "help.txt" help file |local-additions|. This is done when viewing the file in Vim, the file itself is not changed. It is done by going through all help files and obtaining the first line of each file. The files in $VIMRUNTIME/doc are skipped. *help-xterm-window* If you want to have the help in another xterm window, you could use this command: > :!xterm -e vim +help & < *:helpfind* *:helpf* :helpf[ind] Like |:help|, but use a dialog to enter the argument. Only for backwards compatibility. It now executes the ToolBar.FindHelp menu entry instead of using a builtin dialog. {only when compiled with |+GUI_GTK|} {not in Vi} *:helpt* *:helptags* *E154* *E150* *E151* *E152* *E153* *E670* :helpt[ags] [++t] {dir} Generate the help tags file(s) for directory {dir}. When {dir} is ALL then all "doc" directories in 'runtimepath' will be used. All "*.txt" and "*.??x" files in the directory and sub-directories are scanned for a help tag definition in between stars. The "*.??x" files are for translated docs, they generate the "tags-??" file, see |help-translated|. The generated tags files are sorted. When there are duplicates an error message is given. An existing tags file is silently overwritten. The optional "++t" argument forces adding the "help-tags" tag. This is also done when the {dir} is equal to $VIMRUNTIME/doc. To rebuild the help tags in the runtime directory (requires write permission there): > :helptags $VIMRUNTIME/doc < {not in Vi} ============================================================================== 2. Translated help files *help-translated* It is possible to add translated help files, next to the original English help files. Vim will search for all help in "doc" directories in 'runtimepath'. This is only available when compiled with the |+multi_lang| feature. At this moment translations are available for: Chinese - multiple authors French - translated by David Blanchet Italian - translated by Antonio Colombo Japanese - multiple authors Polish - translated by Mikolaj Machowski Russian - translated by Vassily Ragosin See the Vim website to find them: http://www.vim.org/translations.php A set of translated help files consists of these files: help.abx howto.abx ... tags-ab "ab" is the two-letter language code. Thus for Italian the names are: help.itx howto.itx ... tags-it The 'helplang' option can be set to the preferred language(s). The default is set according to the environment. Vim will first try to find a matching tag in the preferred language(s). English is used when it cannot be found. To find a tag in a specific language, append "@ab" to a tag, where "ab" is the two-letter language code. Example: > :he user-manual@it :he user-manual@en The first one finds the Italian user manual, even when 'helplang' is empty. The second one finds the English user manual, even when 'helplang' is set to "it". When using command-line completion for the ":help" command, the "@en" extension is only shown when a tag exists for multiple languages. When the tag only exists for English "@en" is omitted. When the first candidate has an "@ab" extension and it matches the first language in 'helplang' "@ab" is also omitted. When using |CTRL-]| or ":help!" in a non-English help file Vim will try to find the tag in the same language. If not found then 'helplang' will be used to select a language. Help files must use latin1 or utf-8 encoding. Vim assumes the encoding is utf-8 when finding non-ASCII characters in the first line. Thus you must translate the header with "For Vim version". The same encoding must be used for the help files of one language in one directory. You can use a different encoding for different languages and use a different encoding for help files of the same language but in a different directory. Hints for translators: - Do not translate the tags. This makes it possible to use 'helplang' to specify the preferred language. You may add new tags in your language. - When you do not translate a part of a file, add tags to the English version, using the "tag@en" notation. - Make a package with all the files and the tags file available for download. Users can drop it in one of the "doc" directories and start use it. Report this to Bram, so that he can add a link on www.vim.org. - Use the |:helptags| command to generate the tags files. It will find all languages in the specified directory. ============================================================================== 3. Writing help files *help-writing* For ease of use, a Vim help file for a plugin should follow the format of the standard Vim help files. If you are writing a new help file it's best to copy one of the existing files and use it as a template. The first line in a help file should have the following format: *helpfile_name.txt* For Vim version 7.3 Last change: 2010 June 4 The first field is a link to the help file name. The second field describes the applicable Vim version. The last field specifies the last modification date of the file. Each field is separated by a tab. At the bottom of the help file, place a Vim modeline to set the 'textwidth' and 'tabstop' options and the 'filetype' to "help". Never set a global option in such a modeline, that can have consequences undesired by whoever reads that help. TAGS To define a help tag, place the name between asterisks (*tag-name*). The tag-name should be different from all the Vim help tag names and ideally should begin with the name of the Vim plugin. The tag name is usually right aligned on a line. When referring to an existing help tag and to create a hot-link, place the name between two bars (|) eg. |help-writing|. When referring to a Vim command and to create a hot-link, place the name between two backticks, eg. inside `:filetype`. You will see this is highlighted as a command, like a code block (see below). When referring to a Vim option in the help file, place the option name between two single quotes, eg. 'statusline' HIGHLIGHTING To define a column heading, use a tilde character at the end of the line. This will highlight the column heading in a different color. E.g. Column heading~ To separate sections in a help file, place a series of '=' characters in a line starting from the first column. The section separator line is highlighted differently. To quote a block of ex-commands verbatim, place a greater than (>) character at the end of the line before the block and a less than (<) character as the first non-blank on a line following the block. Any line starting in column 1 also implicitly stops the block of ex-commands before it. E.g. > function Example_Func() echo "Example" endfunction < The following are highlighted differently in a Vim help file: - a special key name expressed either in <> notation as in <PageDown>, or as a Ctrl character as in CTRL-X - anything between {braces}, e.g. {lhs} and {rhs} The word "Note", "Notes" and similar automagically receive distinctive highlighting. So do these: *Todo something to do *Error something wrong You can find the details in $VIMRUNTIME/syntax/help.vim vim:tw=78:ts=8:ft=help:norl:
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