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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"),
Some("toml") => Some("toml"),
Some("yaml") | Some("yml") => Some("yaml"),
Some("js") | Some("jsx") => Some("javascript"),
Some("ts") | Some("tsx") => Some("typescript"),
_ => 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") || first_line.contains("/sh") || first_line.contains(" sh") {
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");
}
#[test]
fn sh_shebang_maps_to_bash_for_llm() {
let contents = "#!/bin/sh\necho hi";
assert_eq!(detect_language(Path::new("file"), contents), "bash");
}
#[test]
fn env_shebang_is_detected() {
let contents = "#!/usr/bin/env sh\necho hi";
assert_eq!(detect_language(Path::new("file"), contents), "bash");
}
#[test]
fn extension_overrides_shebang() {
let contents = "#!/bin/bash\nprint('hello')";
assert_eq!(detect_language(Path::new("main.py"), contents), "python");
}
#[test]
fn javascript_family_extensions_map_correctly() {
let cases = [
("file.js", "javascript"),
("file.jsx", "javascript"),
("file.ts", "typescript"),
("file.tsx", "typescript"),
];
for (filename, expected) in cases {
assert_eq!(detect_language(Path::new(filename), ""), expected);
}
}
#[test]
fn json_derived_extensions_map_correctly() {
let cases = [
("file.json", "json"),
("file.yml", "yaml"),
("file.yaml", "yaml"),
];
for (filename, expected) in cases {
assert_eq!(detect_language(Path::new(filename), ""), expected);
}
}
#[test]
fn toml_extension_is_detected() {
assert_eq!(detect_language(Path::new("Cargo.toml"), ""), "toml");
}
}
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