Harmonise methods for distinguishing different Python source types (#13682)

crates/ruff_python_stdlib/src/path.rs

@@ -1,3 +1,4 @@
+use std::ffi::OsStr;
 use std::path::Path;
 
 /// Return `true` if the [`Path`] is named `pyproject.toml`.
@@ -6,38 +7,10 @@ pub fn is_pyproject_toml(path: &Path) -> bool {
         .is_some_and(|name| name == "pyproject.toml")
 }
 
-/// Return `true` if the [`Path`] appears to be that of a Python interface definition file (`.pyi`).
-pub fn is_python_stub_file(path: &Path) -> bool {
-    path.extension().is_some_and(|ext| ext == "pyi")
-}
-
-/// Return `true` if the [`Path`] appears to be that of a Jupyter notebook (`.ipynb`).
-pub fn is_jupyter_notebook(path: &Path) -> bool {
-    path.extension().is_some_and(|ext| ext == "ipynb")
-}
-
 /// Return `true` if a [`Path`] should use the name of its parent directory as its module name.
 pub fn is_module_file(path: &Path) -> bool {
-    path.file_name().is_some_and(|file_name| {
-        file_name == "__init__.py"
-            || file_name == "__init__.pyi"
-            || file_name == "__main__.py"
-            || file_name == "__main__.pyi"
-    })
-}
-
-#[cfg(test)]
-mod tests {
-    use std::path::Path;
-
-    use crate::path::is_jupyter_notebook;
-
-    #[test]
-    fn test_is_jupyter_notebook() {
-        let path = Path::new("foo/bar/baz.ipynb");
-        assert!(is_jupyter_notebook(path));
-
-        let path = Path::new("foo/bar/baz.py");
-        assert!(!is_jupyter_notebook(path));
-    }
+    matches!(
+        path.file_name().and_then(OsStr::to_str),
+        Some("__init__.py" | "__init__.pyi" | "__main__.py" | "__main__.pyi")
+    )
 }