# Lune 🌙
[](https://github.com/filiptibell/lune/actions/workflows/ci.yaml)
[](https://github.com/filiptibell/lune/actions/workflows/release.yaml)
A [Luau](https://luau-lang.org) script runner
---
🚀 Use the ergonomics and readability of Luau instead of shell scripts 🚀
[Full example & walkthrough](.lune/hello_lune.luau)
## ⚙️ Installation
The preferred way of installing Lune is using [Aftman](https://github.com/lpghatguy/aftman).
This will add `lune` to an `aftman.toml` file in the current directory, or create one if it does not exist:
```sh
$ aftman add filiptibell/lune
```
You can also download pre-built binaries for most systems directly from the linked GitHub Releases page.
## ✏️ Writing Lune Scripts
Check out the examples of how to write a script in the [.lune](.lune) folder !
🔎 Full list of APIs
### **`fs`** - Filesystem
```lua
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,
}
```
### **`json`** - JSON
```lua
type json = {
encode: (value: any, pretty: boolean?) -> string,
decode: (encoded: string) -> any,
}
```
### **`process`** - Current process & child processes
```lua
type process = {
getEnvVars: () -> { string },
getEnvVar: (key: string) -> string?,
setEnvVar: (key: string, value: string) -> (),
exit: (code: number?) -> (),
spawn: (program: string, params: { string }?) -> {
ok: boolean,
code: number,
stdout: string,
stderr: string,
},
}
```
🔀 Example translation from Bash
```bash
#!/bin/bash
VALID=true
COUNT=1
while [ $VALID ]
do
echo $COUNT
if [ $COUNT -eq 5 ];
then
break
fi
((COUNT++))
done
```
**_With Lune & Luau:_**
```lua
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`, an example can be found in the [.vscode](.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 = "roblox-lune"` or `std = "luau+lune"` 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
When you've written a script with either a `.lua` or `.luau` extension, you can run it:
```sh
$ lune script-name
```
This will look for the script `script_name` 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.