61 lines
2.4 KiB
Rust
61 lines
2.4 KiB
Rust
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pub struct Shebang<'a> {
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pub interpreter: &'a str,
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pub argument: Option<&'a str>,
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}
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impl<'a> Shebang<'a> {
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pub fn new(text: &'a str) -> Option<Shebang<'a>> {
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if !text.starts_with("#!") {
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return None;
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}
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let mut pieces = text[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{interpreter, argument})
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}
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}
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#[cfg(test)]
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mod test {
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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!(shebang.map(|shebang| (shebang.interpreter, shebang.argument)), expected_split);
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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("#!/usr/bin/env python", Some(("/usr/bin/env", Some("python" ))));
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check("#!/usr/bin/env python ", Some(("/usr/bin/env", Some("python" ))));
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check("#!/usr/bin/env python -x", Some(("/usr/bin/env", Some("python -x" ))));
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check("#!/usr/bin/env python -x", Some(("/usr/bin/env", Some("python -x"))));
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check("#!/usr/bin/env python \t-x\t", Some(("/usr/bin/env", Some("python \t-x"))));
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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("#! \t\t/usr/bin/env python", Some(("/usr/bin/env", Some("python" ))));
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check("#! /usr/bin/env python ", Some(("/usr/bin/env", Some("python" ))));
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check("#! /usr/bin/env python -x", Some(("/usr/bin/env", Some("python -x" ))));
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check("#! /usr/bin/env python -x", Some(("/usr/bin/env", Some("python -x"))));
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check("#! /usr/bin/env python \t-x\t", Some(("/usr/bin/env", Some("python \t-x"))));
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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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