Prioritize detection through extensions

While shebangs take priority on Unix-like systems, the shebang detection
here is very basic and not guaranteed to be correct, so its use should
be secondary.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/util/language.rs b/src/util/language.rs
index 8da45b8..f0870c8 100644
--- a/src/util/language.rs
+++ b/src/util/language.rs
@@ -63,4 +63,10 @@ mod tests {
         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");
+    }
 }