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