Lash

Lash is a scripting language that compiles to pure bash with the goal of simplifying bash scripting.

Project description

It offers:

• TypeScript like syntax
• Static type checking
• Full support of all bash features (e.g. pipe) in Version 1.0 ;)
• Pain free scripting without adding extra dependencies to your target machine/container (assuming bash is pre-installed by default)

Current Status

(!) DO NOT YET USE LASH IN PRODUCTION (!)

Currently Lash has not reached version 1.0. Therefore, it does not support the full bash language, might include bugs and the language may change without further notice.

We are searching for contributors to help us reach version 1.0 ;)

Installation

For the latest version, run:

npm

npm install -g lash-compiler

yarn

yarn add global lash-compiler

Usage

To compile an input file use:

lash myscript.lsh

This will generate myscript.sh in the same folder the input file is located.

Command line options

You can also specify an output file explicitly:

lash myscript.lsh --out output.sh

To print the output to the console instead of a file use:

lash input.lsh --print

Syntax

The syntax will be familiar to everyone using TypeScript or Javascript.

var s = 1 + 2
s = 3
const h = "Hello "
var greet = h + "welt"
const f = 5.63
var c = (f + 3) < 10

function myFun(msg) {
	echo(msg)
}

if (s < 6-2 && c) {
	echo(greet)
}

for (var i = 1; i < 8; i++) {
	myFun(i)
}

This will generate the following output:

s=$(( 1 + 2 ))
s=3
declare -r h="Hello "
greet="${h}welt"
declare -r f=5.63
c=$([ $(echo "$f + 3 < 10" | bc -l) -eq 1 ]; echo $?)
function myFun {
	msg=$1
	echo $msg
}
if [ $s -lt $(( 6 - 2 )) ] && [ $c -eq 0 ]; then
	echo $greet
fi
for (( i=1; $i < 8; i++ )); do
	myFun $i
done

Please be aware that lash is still in development and does not support all desired features yet. For example you cannot yet define an else branch for if statements, use comments or make use of the pipe operator.

Contribute

There are many ways you can contribute to lash:

• report bugs
• get involved into the language design discussions
• clone the repo and start coding

For a detailed description on how to get invloved take a look at CONTRIBUTING.md

Versioning

We use Semantic Versioning. For the versions available, see the tags on this repository.

Authors

• Christian Nywelt - Initial work and maintainer - crainsaw

See also the list of contributors who participated in this project.

License

This project is licensed under the MIT License - see the LICENSE file for details.