Add Changes::filter_by_project_path

Summary: Useful for future work.

Reviewed By: aniketmathur

Differential Revision: D57542273

fbshipit-source-id: 658a4e03846a2bdf3e4a419d40daa725d7b0cd72

btd/src/changes.rs

@@ -75,13 +75,17 @@ impl Changes {
         self.contains_cell_path(&package.as_cell_path())
     }
 
-    pub fn filter_by_extension(&self, f: impl Fn(Option<&str>) -> bool) -> Changes {
+    pub fn filter_by_cell_path(&self, f: impl Fn(&CellPath) -> bool) -> Changes {
         let paths = self
             .paths
             .iter()
-            .filter(|x| f(x.get().0.extension()))
+            .filter(|x| f(&x.get().0))
             .cloned()
             .collect();
         Self::from_paths(paths)
     }
+
+    pub fn filter_by_extension(&self, f: impl Fn(Option<&str>) -> bool) -> Changes {
+        self.filter_by_cell_path(|x| f(x.extension()))
+    }
 }