# Vim documentation: if_ruby

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    *if_ruby.txt*   For Vim version 7.4.  Last change: 2012 Aug 02

    		  VIM REFERENCE MANUAL    by Shugo Maeda

    The Ruby Interface to Vim				*ruby* *Ruby*

    1. Commands			|ruby-commands|
    2. The VIM module		|ruby-vim|
    3. VIM::Buffer objects		|ruby-buffer|
    4. VIM::Window objects		|ruby-window|
    5. Global variables		|ruby-globals|
    6. Dynamic loading		|ruby-dynamic|

    {Vi does not have any of these commands}

    			*E266* *E267* *E268* *E269* *E270* *E271* *E272* *E273*

    The Ruby interface only works when Vim was compiled with the |+ruby| feature.

     The home page for ruby is	http://www.ruby-lang.org/. You can find links for
    downloading Ruby there.

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

    1. Commands						*ruby-commands*

    							*:ruby* *:rub*
    :rub[y] {cmd}		Execute Ruby command {cmd}.  A command to try it out:
    				:ruby print "Hello"

    :rub[y] << {endpattern}
    {script}
    {endpattern}
    			Execute Ruby script {script}.
    			{endpattern} must NOT be preceded by any white space.
    			If {endpattern} is omitted, it defaults to a dot '.'
    			like for the |:append| and |:insert| commands.  This
    			form of the |:ruby| command is mainly useful for
    			including ruby code in vim scripts.
    			Note: This command doesn't work when the Ruby feature
    			wasn't compiled in.  To avoid errors, see
    			|script-here|.

    Example Vim script:

    	function! RedGem()
    	ruby << EOF
    	class Garnet
    		def initialize(s)
    			@buffer = VIM::Buffer.current
    			vimputs(s)
    		end
    		def vimputs(s)
    			@buffer.append(@buffer.count,s)
    		end
    	end
    	gem = Garnet.new("pretty")
    	EOF
    	endfunction

    						*:rubydo* *:rubyd* *E265*
    :[range]rubyd[o] {cmd}	Evaluate Ruby command {cmd} for each line in the
    			[range], with $_ being set to the text of each line in
    			turn, without a trailing <EOL>.  Setting $_ will change
    			the text, but note that it is not possible to add or
    			delete lines using this command.
    			The default for [range] is the whole file: "1,$".

    							*:rubyfile* *:rubyf*
    :rubyf[ile] {file}	Execute the Ruby script in {file}.  This is the same as
    			":ruby load 'file'"', but allows file name completion.

    Executing Ruby commands is not possible in the |sandbox|.

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

    2. The VIM module					*ruby-vim*

    Ruby code gets all of its access to vim via the "VIM" module.

    Overview
    	print "Hello"			      # displays a message
    	VIM.command(cmd)		      # execute an Ex command
    	num = VIM::Window.count		      # gets the number of windows
    	w = VIM::Window[n]		      # gets window "n"
    	cw = VIM::Window.current	      # gets the current window
    	num = VIM::Buffer.count		      # gets the number of buffers
    	b = VIM::Buffer[n]		      # gets buffer "n"
    	cb = VIM::Buffer.current	      # gets the current buffer
    	w.height = lines		      # sets the window height
    	w.cursor = [row, col]		      # sets the window cursor position
    	pos = w.cursor			      # gets an array [row, col]
    	name = b.name			      # gets the buffer file name
    	line = b[n]			      # gets a line from the buffer
    	num = b.count			      # gets the number of lines
    	b[n] = str			      # sets a line in the buffer
    	b.delete(n)			      # deletes a line
    	b.append(n, str)		      # appends a line after n
    	line = VIM::Buffer.current.line       # gets the current line
    	num = VIM::Buffer.current.line_number # gets the current line number
    	VIM::Buffer.current.line = "test"     # sets the current line number

    Module Functions:

    							*ruby-message*
    VIM::message({msg})
    	Displays the message {msg}.

    							*ruby-set_option*
    VIM::set_option({arg})
    	Sets a vim option.  {arg} can be any argument that the ":set" command
    	accepts.  Note that this means that no spaces are allowed in the
    	argument!  See |:set|.

    							*ruby-command*
    VIM::command({cmd})
    	Executes Ex command {cmd}.

    							*ruby-evaluate*
    VIM::evaluate({expr})
    	Evaluates {expr} using the vim internal expression evaluator (see
    	|expression|).  Returns the expression result as a string.
    	A |List| is turned into a string by joining the items and inserting
    	line breaks.

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

    3. VIM::Buffer objects					*ruby-buffer*

    VIM::Buffer objects represent vim buffers.

    Class Methods:

    current		Returns the current buffer object.
    count		Returns the number of buffers.
    self[{n}]	Returns the buffer object for the number {n}.  The first number
    		is 0.

    Methods:

    name		Returns the name of the buffer.
    number		Returns the number of the buffer.
    count		Returns the number of lines.
    length		Returns the number of lines.
    self[{n}]	Returns a line from the buffer. {n} is the line number.
    self[{n}] = {str}
    		Sets a line in the buffer. {n} is the line number.
    delete({n})	Deletes a line from the buffer. {n} is the line number.
    append({n}, {str})
    		Appends a line after the line {n}.
    line		Returns the current line of the buffer if the buffer is
    		active.
    line = {str}    Sets the current line of the buffer if the buffer is active.
    line_number     Returns the number of the current line if the buffer is
    		active.

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

    4. VIM::Window objects					*ruby-window*

    VIM::Window objects represent vim windows.

    Class Methods:

    current		Returns the current window object.
    count		Returns the number of windows.
    self[{n}]	Returns the window object for the number {n}.  The first number
    		is 0.

    Methods:

    buffer		Returns the buffer displayed in the window.
    height		Returns the height of the window.
    height = {n}	Sets the window height to {n}.
    width		Returns the width of the window.
    width = {n}	Sets the window width to {n}.
    cursor		Returns a [row, col] array for the cursor position.
    cursor = [{row}, {col}]
    		Sets the cursor position to {row} and {col}.

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

    5. Global variables					*ruby-globals*

    There are two global variables.

    $curwin		The current window object.
    $curbuf		The current buffer object.

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

    6. Dynamic loading					*ruby-dynamic*

    On MS-Windows and Unix the Ruby library can be loaded dynamically.  The
    |:version| output then includes |+ruby/dyn|.

    This means that Vim will search for the Ruby DLL file or shared library only
    when needed.  When you don't use the Ruby interface you don't need it, thus
    you can use Vim even though this library file is not on your system.

    You need to install the right version of Ruby for this to work.  You can find
    the package to download from:
    	http://www.garbagecollect.jp/ruby/mswin32/en/download/release.html
    Currently that is ruby-1.9.1-p429-i386-mswin32.zip

    To use the Ruby interface the Ruby DLL must be in your search path.  In a
    console window type "path" to see what directories are used.

    The name of the DLL must match the Ruby version Vim was compiled with.
    Currently the name is "msvcrt-ruby191.dll".  That is for Ruby 1.9.1.  To know
    for sure edit "gvim.exe" and search for "ruby\d*.dll\c".

    If you want to build Vim with Ruby 1.9.1, you need to edit the config.h file
    and comment-out the check for _MSC_VER.
    You may also need to rename the include directory name to match the version,
    strangely for Ruby 1.9.3 the directory is called 1.9.1.

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