bush

Bash Upgraded SHell

• Goal: improve the existing bash shell by removing arcane syntax conventions and simplifying syntax
• Language: Zig
• Parser Generator: Tree-sitter

Authors

• Jakub Czajka czajkub@student.agh.edu.pl
• Jakub Czyż jczyz@student.agh.edu.pl

Example program

// Operator precedence
$counter = 1 || 2 && 3 == 4 + 5 * -(6 + 7)

// function declaration
function add($a, $b) {
    return $a + $b
}

// loop
while $counter < 10 {
    // piped command with redirects
    cat test | cat > res.txt | cat &> res2.txt

    // function call
    $counter = $counter + $(add 1 2)
}

Generate parser

1. Install Tree-sitter CLI
2. Run tree-sitter generate grammar.js

Documentation

• Language Tokens
• Grammar Rules