just/src/shebang.rs

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pub(crate) struct Shebang<'line> {
pub(crate) interpreter: &'line str,
pub(crate) argument: Option<&'line str>,
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}
impl<'line> Shebang<'line> {
pub(crate) fn new(line: &'line str) -> Option<Shebang<'line>> {
if !line.starts_with("#!") {
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return None;
}
let mut pieces = line[2..]
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.lines()
.nth(0)
.unwrap_or("")
.trim()
.splitn(2, |c| c == ' ' || c == '\t');
let interpreter = pieces.next().unwrap_or("");
let argument = pieces.next();
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if interpreter == "" {
return None;
}
Some(Shebang {
interpreter,
argument,
})
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}
}
#[cfg(test)]
mod tests {
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use super::Shebang;
#[test]
fn split_shebang() {
fn check(text: &str, expected_split: Option<(&str, Option<&str>)>) {
let shebang = Shebang::new(text);
assert_eq!(
shebang.map(|shebang| (shebang.interpreter, shebang.argument)),
expected_split
);
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}
check("#! ", None);
check("#!", None);
check("#!/bin/bash", Some(("/bin/bash", None)));
check("#!/bin/bash ", Some(("/bin/bash", None)));
check(
"#!/usr/bin/env python",
Some(("/usr/bin/env", Some("python"))),
);
check(
"#!/usr/bin/env python ",
Some(("/usr/bin/env", Some("python"))),
);
check(
"#!/usr/bin/env python -x",
Some(("/usr/bin/env", Some("python -x"))),
);
check(
"#!/usr/bin/env python -x",
Some(("/usr/bin/env", Some("python -x"))),
);
check(
"#!/usr/bin/env python \t-x\t",
Some(("/usr/bin/env", Some("python \t-x"))),
);
check("#/usr/bin/env python \t-x\t", None);
check("#! /bin/bash", Some(("/bin/bash", None)));
check("#!\t\t/bin/bash ", Some(("/bin/bash", None)));
check(
"#! \t\t/usr/bin/env python",
Some(("/usr/bin/env", Some("python"))),
);
check(
"#! /usr/bin/env python ",
Some(("/usr/bin/env", Some("python"))),
);
check(
"#! /usr/bin/env python -x",
Some(("/usr/bin/env", Some("python -x"))),
);
check(
"#! /usr/bin/env python -x",
Some(("/usr/bin/env", Some("python -x"))),
);
check(
"#! /usr/bin/env python \t-x\t",
Some(("/usr/bin/env", Some("python \t-x"))),
);
check("# /usr/bin/env python \t-x\t", None);
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}
}