If_ruby

Nvim :help pages, generated from source using the tree-sitter-vimdoc parser.

The Ruby Interface to Vim ruby Ruby

The home page for ruby is https://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] << [trim] [{endmarker}] {script} {endmarker} Execute Ruby script {script}.

If [endmarker] is omitted, it defaults to a dot '.' like for the :append and :insert commands. Refer to :let-heredoc for more information.

This form of the :ruby command is mainly useful for including ruby code in vim scripts.

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

To see what version of Ruby you have:

:ruby print RUBY_VERSION

: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 full 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. First line number is 1 and first column number is 0. 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. rubyeval() Vim function ruby-rubyeval

To facilitate bi-directional interface, you can use rubyeval() function to evaluate Ruby expressions and pass their values to Vim script.

The Ruby value "true", "false" and "nil" are converted to v:true, v:false and v:null, respectively.