# Vim documentation: usr_05

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    *usr_05.txt*	For Vim version 6.0aq.  Last change: 2001 Aug 05

    		     VIM USER MANUAL - by Bram Moolenaar

    			      Set your settings

    Vim can be tuned to work like you want it to.  This chapter shows you how to
    make Vim start with options set to different values.  Add plugins to extend
    Vims capabilities.  Or define your own macros.

    |05.1|	The vimrc file
    |05.2|	The example vimrc file explained
    |05.3|	Simple mappings
    |05.4|	Adding a plugin
    |05.5|	Adding a help file
    |05.6|	The option window
    |05.7|	Often used options

         Next chapter: |usr_06.txt|  Using syntax highlighting
     Previous chapter: |usr_04.txt|  Making small changes
    Table of contents: |usr_toc.txt|

    ==============================================================================

    *05.1*	The vimrc file

    You probably got tired of typing commands that you use very often.  To start
    with all your favorite option settings and mappings, you write them in what is
    called the vimrc file.  Vim reads this file when it starts up.

    If you have trouble finding your vimrc file, use this command:

    	:scriptnames

    One of the first files in the list should be called ".vimrc" or "_vimrc" and
    is located in your home directory.
       If you don't have a vimrc file yet, see |vimrc| to find out where you can
    create a vimrc file.  Also, the ":version" command mentions the name of the
    "user vimrc file" Vim looks for.

    For Unix this file is always used:

    	~/.vimrc

    For MS-DOS and MS-Windows it is mostly one of these:

    	$HOME/_vimrc
    	$VIM/_vimrc

    The vimrc file can contain all the commands that you type after a colon.  The
    most simple ones are for setting options.  For example, if you want Vim to
    always start with the 'incsearch' option on, add this line you your vimrc
    file:

    	set incsearch

    For this new line to take effect you need to exit Vim and start it again.
    Later you will learn how to do this without exiting Vim.

    This chapter only explains the most basic items.  For more information on how
    to write a Vim script file: |usr_41.txt|.

    ==============================================================================

    *05.2*	The example vimrc file explained		*vimrc_example.vim*

    In the first chapter was explained how the example vimrc (included in the
    Vim distribution) file can be used to make Vim startup in not-compatible mode
    (see |not-compatible|).  The file can be found here:

    	$VIMRUNTIME/vimrc_example.vim

    In this section we will explain the various commands used in this file.  This
    will give you hints about how to set up your own preferences.  Not everything
    will be explained though.  Use the ":help" command to find out more.

    	set nocompatible

    As mentioned in the first chapter, these manuals explain Vim working in an
    improved way, thus not completely Vi compatible.  Setting the 'compatible'
    option off, thus 'nocompatible' takes care of this.

    	set backspace=indent,eol,start

    This specifies where in Insert mode the <BS> is allowed to delete the
    character in front of the cursor.  The three items, separated by commas, tell
    Vim to delete the white space at the start of the line, a line break and the
    character before where Insert mode started.

    	set autoindent

    This makes Vim use the indent of the previous line for a newly created line.
    Thus there is the same amount of white space before the new line.  For example
    when pressing <Enter> in Insert mode, and when using the "o" command to open a
    new line.

    	if has("vms")
    	  set nobackup
    	else
    	  set backup
    	endif

    This tells Vim to keep a backup copy of a file when overwriting it.  But not
    on the VMS system, since it keeps old versions of files already.  The backup
    file will have the same name as the original file with "~" added.  See |07.4|

    	set history=50

    Keep 50 commands and 50 search patterns in the history.  Use another number if
    you want to remember less or more lines.

    	set ruler

    Always display the current cursor position in the lower right corner of the
    Vim window.

    	set showcmd

    Display an incomplete command in the lower right corner of the Vim window,
    left of the ruler.  For example, when you type "2f", Vim is waiting for you to
    type the character to find and "2f" is displayed.  When you press "w" next,
    the "2fw" command is executed and the displayed "2f" is removed.

    	+-------------------------------------------------+
    	|text in the Vim window                           |
    	|~                                                |
    	|~                                                |
    	|-- VISUAL --                   2f     43,8   17% |
    	+-------------------------------------------------+
    	 ^^^^^^^^^^^                  ^^^^^^^^ ^^^^^^^^^^
    	  'showmode'                 'showcmd'  'ruler'

    	set incsearch

    Display the match for a search pattern when halfway typing it.

    	map Q gq

    This defines a key mapping.  More about that in the next section.  This
    defines the "Q" command to do formatting with the "gq" operator.  This is how
    it worked before Vim 5.0.  Otherwise the "Q" command starts Ex mode, but you
    will not need it.

    	vnoremap p <Esc>:let current_reg = @"<CR>gvs<C-R>=current_reg<CR><Esc>

    This is a complicated mapping.  It will not be explained how it works here.
    What it does is to make "p" in Visual mode overwrite the selected text with
    the previously yanked text.  You can see that mappings can be used to do quite
    complicated things.  Still, it is just a sequence of commands that are
    executed like you typed them.

    	if &t_Co > 2 || has("gui_running")
    	  syntax on
    	  set hlsearch
    	endif

    This switches on syntax highlighting, but only if colors are available.  And
    the 'hlsearch' option tells Vim to highlight matches with the last used search
    pattern.  The "if" command is very useful to set options only when some
    condition is met.  More about that in |usr_41.txt|.

    							*vimrc-filetype*
    	filetype plugin indent on

    This switches on three very clever mechanisms:
    1. Filetype detection.
       Whenever you start editing a file, Vim will try to figure out what kind of
       file this is.  When you edit "main.c", Vim will see the ".c" extension and
       recognize this as a "c" filetype.  When you edit a file that starts with
       "#!/bin/sh", Vim will recognize it as a "sh" filetype.
       The filetype detection is used for syntax highlighting and the other two
       items below.
       See |filetypes|.

    2. Using filetype plugin files
       Many different filetypes are edited with different options.  For example,
       when you edit a "c" file, it's very useful to set the 'cindent' option to
       automatically indent the lines.  These commonly useful option settings are
       included with Vim in filetype plugins.  You can also add your own, see
       |write-filetype-plugin|.

    3. Using indent files
       When editing programs, the indent of a line can often be computed
       automatically.  Vim comes with these indent rules for a number of
       filetypes.  See |:filetype-indent-on| and 'indentexpr'.

    	autocmd FileType text setlocal textwidth=78

    This makes Vim break text to avoid lines getting longer than 78 characters.
    But only for files that have been detected to be plain text.  There are
    actually two parts here.  "autocmd FileType text" is an autocommand.  This
    defines that when the file type is set to "text" the following command is
    automatically executed.  "setlocal textwidth=78" sets the 'textwidth' option
    to 78, but only locally in one file.

    	autocmd BufReadPost *
    	    \ if line("'\"") > 0 && line("'\"") <= line("$") |
    	    \   exe "normal g`\"" |
    	    \ endif

    Another autocommand.  This time it is used after reading any file.  The
    complicated stuff after it checks if the '"' mark is defined, and jumps to it
    if so.  The backslash at the start of a line is used to continue the command
    from the previous line.  That avoids a line getting very long.
    See |line-continuation|.  This only works in a Vim script file, not when
    typing commands at the command-line.

    ==============================================================================

    *05.3*	Simple mappings

    A mapping enables you to bind a set of Vim commands to a single key.  Suppose,
    for example, that you need to surround certain words with curly braces.  In
    other words, you need to change a word such as "amount" into "{amount}".  With
    the :map command, you can tell Vim that the F5 key does this job.  The command
    is as follows:

    	:map <F5> i{<Esc>ea}<Esc>

    	Note:
    	When entering this command, you must enter <F5> by typing four
    	characters.  Similarly, <Esc> is not entered by pressing the <Esc>
    	key, but by typing five characters.  Watch out for this difference
    	when reading the manual!

    Let's break this down:
        <F5>	The F5 function key.  This is the trigger key that causes the
    		command to be executed as the key is pressed.

        i{<Esc>	Insert the { character.  The <Esc> key ends Insert mode.

        e		Move to the end of the word.

        a}<Esc>	Append the } to the word.

    After you execute the ":map" command, all you have to do to put {} around a
    word is to put the cursor on the first character and press F5.

    In this example, the trigger is a single key; it can be any string.  But when
    you use an existing Vim command, that command will no longer be available.
    You better avoid that.
       One key that can be used with mappings is the backslash.  Since you
    probably want to define more than one mapping, add another character.  You
    could map "\p" to add parens around a word, and "\c" to add curly braces, for
    example:

    	:map \p i(<Esc>ea)<Esc>
    	:map \c i{<Esc>ea}<Esc>

    You need to type the \ and the p quickly after another, so that Vim knows they
    belong together.

    The ":map" command (with no arguments) lists out your current mappings.  At
    least the ones for Normal mode.  More about mappings in section |40.1|.

    ==============================================================================

    *05.4*	Adding a plugin					*add-plugin* *plugin*

    Vim's functionality can be extended by adding plugins.  A plugin is nothing
    more than a Vim script file that is loaded automatically when Vim starts.  You
    can add a plugin very easily by dropping it in your plugin directory.
    {not available when Vim was compiled without the |+eval| feature}

    There are two types of plugins:

        global plugin: Used for all kinds of files
      filetype plugin: Only used for a specific type of file

    The global plugins will be discussed first, then the filetype ones
    |add-filetype-plugin|.

    GLOBAL PLUGINS						*standard-plugin*

    When you start Vim, it will automatically load a number of global plugins.
    You don't have to do anything for this.  They add functionality that most
    people will want to use, but which was implemented as a Vim script instead of
    being compiled into Vim.  You can find them listed in the help index
    |standard-plugin-list|.  Also see |load-plugins|.

    							*add-global-plugin*
    You can add a global plugin to add functionality that will always be present
    when you use Vim.  There are only two steps for adding a global plugin:
    1. Get a copy of the plugin.
    2. Drop it in the right directory.

    GETTING A GLOBAL PLUGIN

    Where can you find plugins?
    - Some come with Vim.  You can find them in the directory $VIMRUNTIME/macros
      and its sub-directories.
     - Download from the net, check out	http://vim.sf.net.
    - They are sometimes posted in a Vim |maillist|.
    - You could write one yourself, see |write-plugin|.

    USING A GLOBAL PLUGIN

    First read the text in the plugin itself to check for any special conditions.
    Then copy the file to your plugin directory:

    	system		plugin directory
    	Unix		~/.vim/plugin/
    	PC and OS/2	$HOME/vimfiles/plugin or $VIM/vimfiles/plugin
    	Amiga		s:vimfiles/plugin
    	Macintosh	$VIM:vimfiles:plugin
    	RISC-OS		Choices:vimfiles.plugin

    Example for Unix (assuming you didn't have a plugin directory yet):

    	mkdir ~/.vim
    	mkdir ~/.vim/plugin
    	cp /usr/local/share/vim/vim60/macros/justify.vim ~/.vim/plugin

    That's all!  Now you can use the commands defined in this plugin to justify
    text.

    FILETYPE PLUGINS			*add-filetype-plugin* *ftplugins*

    The Vim distribution comes with a set of plugins for different filetypes that
    you can start using with this command:

    	:filetype plugin on

    That's all!  See |vimrc-filetype|.

    If you are missing a plugin for a filetype you are using, or you found a
    better one, you can add it.  There are two steps for adding a filetype plugin:
    1. Get a copy of the plugin.
    2. Drop it in the right directory.

    GETTING A FILETYPE PLUGIN

    You can find them in the same places as the global plugins.  Watch out if the
    type of file is mentioned, then you know if the plugin is a global or a
    filetype one.  The scripts in $VIMRUNTIME/macros are global ones, the filetype
    plugins are in $VIMRUNTIME/ftplugin.

    USING A FILETYPE PLUGIN

    You can add a filetype plugins by dropping it in the right directory.  The
    name of this directory is in the same directory mentioned above for global
    plugins, but the last part is "ftplugin".  Suppose you have found a plugin for
    the "stuff" filetype, and you are on Unix.  Then you can move this file to the
    ftplugin directory:

    	mv thefile ~/.vim/ftplugin/stuff.vim

    If that file already exists you already have a plugin for "stuff".  You might
    want to check if the existing plugin doesn't conflict with the one you are
    adding.  If it's OK, you can give the new one another name:

    	mv thefile ~/.vim/ftplugin/stuff_too.vim

    The underscore is used to separate the name of the filetype from the rest,
    which can be anything.  If you would use "otherstuff.vim" it wouldn't work, it
    would be loaded for the "otherstuff" filetype.

    On MS-DOS you cannot use long filenames.  You would run into trouble if you
    add a second plugin and the filetype has more than six characters.  You can
    use an extra directory to get around this:

    	mkdir $VIM/vimfiles/ftplugin/fortran
    	copy thefile $VIM/vimfiles/ftplugin/fortran/too.vim

    The generic names for the filetype plugins are:

    	ftplugin/<filetype>.vim
    	ftplugin/<filetype>_<name>.vim
    	ftplugin/<filetype>/<name>.vim

    Here "<name>" can be any name that you prefer.
    Examples for the "stuff" filetype on Unix:

    	~/.vim/ftplugin/stuff.vim
    	~/.vim/ftplugin/stuff_def.vim
    	~/.vim/ftplugin/stuff/header.vim

    The <filetype> part is the name of the filetype the plugin is to be used for.
    Only files of this filetype will use the settings from the plugin.  The <name>
    part of the plugin file doesn't matter, you can use it to have several plugins
    for the same filetype.  Note that it must end in ".vim".

    Further reading:
    |filetype-plugins|	Documentation for the filetype plugins and information
    			about how to avoid that mappings cause problems.
    |load-plugins|		When the global plugins are loaded during startup.
    |ftplugin-overrule|	Overruling the settings from a global plugin.
    |write-plugin|		How to write a plugin script.
    |plugin-details|	For more information about using plugins or when your
    			plugin doesn't work.

    ==============================================================================

    *05.5*	Adding a help file			*add-local-help*

    If you are lucky, the plugin you installed also comes with a help file.  We
    will explain how to install the help file, so that you can easily find help
    for your new plugin.
       Let us use the "matchit.vim" plugin as an example (it is included with
    Vim).  This plugin makes the "%" command jump to matching HTML tags,
    if/else/endif in Vim scripts, etc.  Very useful, although it's not backwards
    compatible (that's why it is not enabled by default).
       This plugin comes with documentation: "matchit.txt".  Let's first copy the
    plugin to the right directory.  This time we will do it from inside Vim, so
    that we can use $VIMRUNTIME.  (You may skip some of the "mkdir" commands if
    you already have the directory.)

    	:!mkdir ~/.vim
    	:!mkdir ~/.vim/plugin
    	:!cp $VIMRUNTIME/macros/matchit.vim ~/.vim/plugin

    Now create a "doc" directory in one of the directories in 'runtimepath'.

    	:!mkdir ~/.vim/doc

    Copy the help file to the "doc" directory.

    	:!cp $VIMRUNTIME/macros/matchit.txt ~/.vim/doc

    Now comes the trick, which allows you to jump to the subjects in the new help
    file: Generate the local tags file with the |:helptags| command.

    	:helptags ~/.vim/doc

    Now you can use the

    	:help g%

    command to find help for "g%" in the help file you just added.  You can see an
    entry for the local help file when you do:

    	:help

    Go down to the "LOCAL ADDITIONS" section.  The title lines from the local help
    files are automagically added to this section.  There you can see which local
    help files have been added and jump to them through the tag.

    For writing a local help file, see |write-local-help|.

    ==============================================================================

    *05.6*	The option window

    If you are looking for an option that does what you want, you can search in
    the help files here: |options|.  Another way is by using this command:

    	:options

    This opens a new window, with a list of options with a one-line explanation.
    The options are grouped by subject.  Move the cursor to a subject and press
    <Enter> to jump there.  Press <Enter> again to jump back.  Or use CTRL-O.

    You can change the value of an option.  For example, move to the "displaying
    text" subject.  Then move the cursor down to this line:

    	set wrap	nowrap

    When you hit <Enter>, the line will change to:

    	set nowrap	wrap

    The option has now been switched off.

    Just above this line is a short description of the 'wrap' option.  Move the
    cursor one line up to place it in this line.  Now hit <Enter> and you jump to
    the full help on the 'wrap' option.  Use CTRL-O to jump back.

    For options that take a number or string argument you can edit the value.
    Then press <Enter> to apply the new value.  For example, move the cursor a few
    lines up to this line:

    	set so=0

    Position the cursor on the zero with "$".  Change it into a five with "r5".
    Then press <Enter> to apply the new value.  When you now move the cursor
    around you will notice that the text starts scrolling before you reach the
    border.  This is what the 'scrolloff' option does, it specifies an offset
    from the window border where scrolling starts.

    ==============================================================================

    *05.7*	Often used options

    There are an awful lot of options.  Most of them you will hardly ever use.
    Some of the more useful ones will be mentioned here.  Don't forget you can
    find more help on these options with the ":help" command, with single quotes
    before and after the option name.  For example:

    	:help 'wrap'

    In case you have messed up an option value, you can set it back to the
    default by putting a ampersand (&) after the option name.  Example:

    	:set iskeyword&

    NOT WRAPPING LINES

    Vim normally wraps long lines, so that you can see all of the text.  Sometimes
    it's better to let the text continue right of the window.  Then you need to
    scroll the text left-right to see all of a long line.  Switch wrapping of with
    this command:

    	:set nowrap

    Vim will automatically scroll the text when you move to text that is not
    displayed.  To see a context of ten characters, do this:

    	:set sidescroll=10

    This doesn't change the text in the file, only the way it is displayed.

    WRAPPING MOVEMENT COMMANDS

    Most commands for moving around will stop moving at the start and end of a
    line.  You can change that with the 'whichwrap' option.  This sets it to the
    default value:

    	:set whichwrap=b,s

    This allows the <BS> key, when used in the first position of a line, to move
    the cursor to the end of the previous line.  And the <Space> key moves from
    the end of a line to the start of the next one.

    To allow the cursor keys <Left> and <Right> to also wrap, use this command:

    	:set whichwrap=b,s,<,>

    This is still only for Normal mode.  To let <Left> and <Right> do this in
    Insert mode as well:

    	:set whichwrap=b,s,<,>,[,]

    There are a few other flags that can be added, see 'whichwrap'.

    VIEWING TABS

    When there are tabs in a file, you cannot see where they are.  To make them
    visible:

    	:set list

    Now every Tab is displayed as ^I.  And a $ is displayed at the end of each
    line, so that you can spot trailing spaces that would otherwise go unnoticed.
       A disadvantage is that this looks ugly when there are many Tabs in a file.
    If you have a color terminal, or are using the GUI, Vim can show the spaces
    and tabs as highlighted characters.  Use the 'listchars' option:

    	:set listchars=tab:>-,trail:-

    Now every tab will be displayed as ">---" and trailing white space as "-".
    Looks a lot better, doesn't it?

    KEYWORDS

    The 'iskeyword' option specifies which characters can appear in a word:

    	:set iskeyword
     	  iskeyword=@,48-57,_,192-255

    The "@" stands for all alphabetic letters.  "48-57" stands for ASCII
    characters 48 to 57, which are the numbers 0 to 9.  "192-255" are the
    printable latin characters.
       Sometimes you will want to include a dash in keywords, so that commands
    like "w" consider "upper-case" to be one word.  You can do it like this:

    	:set iskeyword+=-
    	:set iskeyword
     	  iskeyword=@,48-57,_,192-255,-

    If you look at the new value, you will see that Vim has added a comma for you.
       To remove a character use "-=".  For example, to remove the underscore:

    	:set iskeyword-=_
    	:set iskeyword
     	  iskeyword=@,48-57,192-255,-

    This time a comma is automatically deleted.

    ROOM FOR MESSAGES

    When Vim starts there is one line at the bottom that is used for messages.
    When a message is long, it is either truncated, thus you can only see part of
    it, or the text scrolls and you have to press <Enter> to continue.
       You can set the 'cmdheight' option to the number of lines used for
    messages.  Example:

    	:set cmdheight=3

    This does mean there is less room to edit text, thus it's a compromise.

    ==============================================================================

    Next chapter: |usr_06.txt|  Using syntax highlighting

    Copyright: see |manual-copyright|  vim:tw=78:
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