WORK IN PROGRESS

Please note that this plugin is currently in alpha stage and still under active development. We encourage everyone to try it and give feedback, but we don't recommend it for production use yet.

Intro

Prettier is an opinionated code formatter. It enforces a consistent style by parsing your code and re-printing it with its own rules that take the maximum line length into account, wrapping code when necessary.

This plugin adds support for the Lua language to Prettier.

Input

function deepcopy(orig)
  local orig_type = type(orig)
     local copy

  if orig_type == 'table' then; copy = {}
  for orig_key, orig_value in next, orig, nil do
  copy[deepcopy(orig_key)] = deepcopy(orig_value)
          end
          setmetatable(
            copy,
            deepcopy(
              getmetatable(orig)))
      else
          copy = orig
      end
    return copy
  end

Output

function deepcopy(orig)
	local orig_type = type(orig)
	local copy

	if orig_type == "table" then
		copy = {}
		for orig_key, orig_value in next, orig, nil do
			copy[deepcopy(orig_key)] = deepcopy(orig_value)
		end
		setmetatable(copy, deepcopy(getmetatable(orig)))
	else
		copy = orig
	end
	return copy
end

Install

yarn:

yarn add --dev prettier @prettier/plugin-lua
# or globally
yarn global add prettier @prettier/plugin-lua

npm:

npm install --save-dev prettier @prettier/plugin-lua
# or globally
npm install --global prettier @prettier/plugin-lua

Use

If you installed prettier as a local dependency, you can add prettier as a script in your package.json,

"scripts": {
  "prettier": "prettier"
}

also add it as a plugin to your prettierrc,

"plugins": [
  "@prettier/plugin-lua"
]

and then run it via

yarn run prettier path/to/file.lua --write
# or
npm run prettier -- path/to/file.lua --write

If you installed globally, run

prettier path/to/file.lua --write

Editor integration

Integration in the prettier plugin for your favorite editor might not be working yet, see the related issues for VS Code, Atom and Vim.

For the moment, you can set up prettier to run on save like this:

Atom

Install save-autorun and create a .save.cson file in your project with the following content:

"**/*.lua": "prettier ${path} --write"

VScode

Install Run on Save and add the following section to your settings:

"emeraldwalk.runonsave": {
  "commands": [
    {
      "match": "\\.lua$",
        "cmd": "prettier ${file} --write"
    }
  ]
}

Vim

Adding the following to .vimrc will define a custom command :PrettierLua that runs the plugin while preserving the cursor position and run it on save.

" Prettier for Lua
function PrettierLuaCursor()
  let save_pos = getpos(".")
  %! prettier --stdin --parser=lua
  call setpos('.', save_pos)
endfunction
" define custom command
command PrettierLua call PrettierLuaCursor()
" format on save
autocmd BufwritePre *.lua PrettierLua

Sublime Text

Install JsPrettier using Package Control and add the following to your <project_name>.sublime-project project-level file:

{
  "settings": {
    "js_prettier": {
      "auto_format_on_save": true,
      "custom_file_extensions": ["lua"],
    }
  }
}

Alternatively, "custom_file_extensions": ["lua"] can be added to the JsPrettier plugin user settings.

Contributing

If you're interested in contributing to the development of Prettier for Lua, you can follow the CONTRIBUTING guide from Prettier, as it all applies to this repository too.

To test it out on a Lua file:

• Clone this repository.
• Run yarn.
• Create a file called test.lua.
• Run yarn prettier test.lua to check the output.