Neovim Ruby

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Ruby bindings for Neovim.

Warning: This project follows Semantic Versioning, thus its API should be considered unstable until it reaches v1.0.0 (spec).


Add this line to your application's Gemfile:

gem "neovim"

And then execute:

$ bundle

Or install it yourself as:

$ gem install neovim


You can control a running nvim process by connecting to $NVIM_LISTEN_ADDRESS. For example, to connect to nvim over a UNIX domain socket, start it up like this:

$ NVIM_LISTEN_ADDRESS=/tmp/nvim.sock nvim

You can then connect to that socket path to get a Neovim::Client:

require "neovim"
client = Neovim.attach_unix("/tmp/nvim.sock")

Refer to the Neovim docs for other ways to connect to nvim, and the Neovim::Client docs for a summary of the client interface.


The neovim-ruby-host executable can be used to spawn Ruby plugins via the rpcstart command. A plugin can be defined like this:

# $VIMRUNTIME/rplugin/ruby/my_plugin.rb

Neovim.plugin do |plug|
  # Define a command called "SetLine" which sets the contents of the current
  # line. This command is executed asynchronously, so the return value is
  # ignored.
  plug.command(:SetLine, :nargs => 1) do |nvim, str|
    nvim.current.line = str

  # Define a function called "Sum" which adds two numbers. This function is
  # executed synchronously, so the result of the block will be returned to nvim.
  plug.function(:Sum, :nargs => 2, :sync => true) do |nvim, x, y|
    x + y

  # Define an autocmd for the BufEnter event on Ruby files.
  plug.autocmd(:BufEnter, :pattern => "*.rb") do |nvim|
    nvim.command("echom 'Ruby file, eh?'")

Ruby plugins go in the $VIMRUNTIME/rplugin/ruby directory, and are auto-loaded after calling :UpdateRemotePlugins. Refer to the Neovim::Plugin::DSL docs for a more complete overview.

The Neovim gem also acts as a compatibility layer for Ruby plugins written for legacy vim. The :ruby, :rubyfile, and :rubydo commands are intended to behave the same as they did in vim, and their documentation can be found here.



  1. Fork it (
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request