lune/README.md

Lune 🌙

A standalone Luau script runner
🚀 Use the ergonomics and readability of Luau for your shell scripts 🚀

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⚙️ Installation

The preferred way of installing Lune is using Aftman.

This will add lune to an aftman.toml file in the current directory, or create one if it does not exist:

aftman add filiptibell/lune

You can also download pre-built binaries for most systems directly from the GitHub Releases page.

✏️ Writing Lune Scripts

Check out the examples on how to write a script in the .lune folder !
A great starting point and walkthrough of Lune can be found in the Hello, Lune example.

🔎 Full list of APIs

console - Logging & formatting

type console = {
	resetColor: () -> (),
	setColor: (color: "black" | "red" | "green" | "yellow" | "blue" | "purple" | "cyan" | "white") -> (),
	resetStyle: () -> (),
	setStyle: (color: "bold" | "dim") -> (),
	format: (...any) -> (string),
	log: (...any) -> (),
	info: (...any) -> (),
	warn: (...any) -> (),
	error: (...any) -> (),
}

fs - Filesystem

type fs = {
	readFile: (path: string) -> string,
	readDir: (path: string) -> { string },
	writeFile: (path: string, contents: string) -> (),
	writeDir: (path: string) -> (),
	removeFile: (path: string) -> (),
	removeDir: (path: string) -> (),
	isFile: (path: string) -> boolean,
	isDir: (path: string) -> boolean,
}

net - Networking

type net = {
	request: (config: string | {
		url: string,
		method: ("GET" | "POST" | "PUT" | "DELETE" | "HEAD" | "OPTIONS" | "PATCH")?,
		headers: { [string]: string }?,
		body: string?,
	}) -> {
		ok: boolean,
		statusCode: number,
		statusMessage: string,
		headers: { [string]: string },
		body: string,
	},
	jsonEncode: (value: any, pretty: boolean?) -> string,
	jsonDecode: (encoded: string) -> any,
}

process - Current process & child processes

type process = {
	args: { string },
	env: { [string]: string? },
	exit: (code: number?) -> (),
	spawn: (program: string, params: { string }?) -> {
		ok: boolean,
		code: number,
		stdout: string,
		stderr: string,
	},
}

task - Task scheduler & thread spawning

type task = {
	cancel: (thread: thread) -> (),
	defer: <T...>(functionOrThread: thread | (T...) -> (...any), T...) -> thread,
	delay: <T...>(duration: number?, functionOrThread: thread | (T...) -> (...any), T...) -> thread,
	spawn: <T...>(functionOrThread: thread | (T...) -> (...any), T...) -> thread,
	wait: (duration: number?) -> (number),
}

🔀 Example translation from Bash

#!/bin/bash
VALID=true
COUNT=1
while [ $VALID ]
do
    echo $COUNT
    if [ $COUNT -eq 5 ];
    then
        break
    fi
    ((COUNT++))
done

With Lune & Luau:

local valid = true
local count = 1
while valid do
    print(count)
    if count == 5 then
        break
    end
    count += 1
end

🧑‍💻 Configuring VSCode for Lune

Lune puts developer experience first, and as such provides type definitions and configurations for several tools out of the box.

Luau LSP

1. Use lune --download-luau-types to download Luau types (luneTypes.d.luau) to the current directory
2. Set your definition files setting to include luneTypes.d.luau
3. Set the require mode setting to relativeToFile

An example of these settings can be found in the .vscode folder in this repository

Selene

1. Use lune --download-selene-types to download Selene types (lune.yml) to the current directory
2. Use either std = "luau+lune", or std = "roblox+lune" if your project also contains Roblox-specific code, in your selene.toml configuration file

NOTE: It is highly recommended to add any type definition files to your .gitignore and to only download them using these commands, since this guarantees that you have type definitions compatible with your installed version of Lune.

🏃 Running Lune Scripts

After you've written a script file, for example script-name.luau, you can run it:

lune script-name

This will look for the file script-name.luau in a few locations:

• The current directory
• The folder lune in the current directory, if it exists
• The folder .lune in the current directory, if it exists

If you don't want Lune to look in sub-directories you can provide a full file path with the file extension included, instead of only the file name.

💭 Additional Commands

lune --list

Lists all scripts found in lune or .lune directories, including any top-level description comments.
Lune description comments are always written at the top of a file and start with a lua-style comment arrow (-->).

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NOTE: Lune also supports files with the .lua extension but using the .luau extension is highly recommended.