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use std::path::Path;
pub fn detect_language(filename: &Path, contents: &str) -> &'static str {
detect_from_extension(filename)
.or_else(|| detect_from_shebang(contents))
.unwrap_or("")
}
fn detect_from_extension(filename: &Path) -> Option<&'static str> {
let ext = filename
.extension()
.and_then(|e| e.to_str())
.map(|e| e.to_ascii_lowercase());
let ext_str = ext.as_deref();
match ext_str {
Some("rs") => Some("rust"),
Some("py") => Some("python"),
Some("json") => Some("json"),
_ => None,
}
}
fn detect_from_shebang(contents: &str) -> Option<&'static str> {
if let Some(first_line) = contents.lines().next()
&& first_line.starts_with("#!")
{
if first_line.contains("python") {
return Some("python");
}
if first_line.contains("bash") {
return Some("bash");
}
}
None
}
#[cfg(test)]
mod tests {
use std::path::Path;
use super::detect_language;
#[test]
fn non_shebang_line_does_not_trigger_detection() {
let contents = "this mentions bash but is not a shebang";
assert_eq!(detect_language(Path::new("file"), contents), "");
}
#[test]
fn detects_python_from_shebang() {
let contents = "#!/usr/bin/python3\nprint('hi')";
assert_eq!(detect_language(Path::new("file"), contents), "python");
}
}
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