feat: cache git blobs

src/caelestia/utils/dots/source.py

@@ -17,6 +17,8 @@ class DotsSource:
         cfg = get_config().get("dots", {})
         self.url = cfg.get("url", "https://github.com/caelestia-dots/caelestia.git")
         self.branch = cfg.get("branch", "main")
+        # Cache git blobs by (ref, relpath); objects are immutable for a given rev
+        self._blob_cache: dict[tuple[str, str], bytes] = {}
 
     @property
     def remote_ref(self) -> str:
@@ -90,7 +92,10 @@ class DotsSource:
         return self._git("show", f"{ref}:{relpath}")
 
     def blob_at(self, ref: str, relpath: str) -> bytes:
-        return self._git_bytes("show", f"{ref}:{relpath}")
+        key = (ref, relpath)
+        if key not in self._blob_cache:
+            self._blob_cache[key] = self._git_bytes("show", f"{ref}:{relpath}")
+        return self._blob_cache[key]
 
     def files_at(self, ref: str, relpath: str) -> list[str]:
         """Repo-relative paths of all files under relpath at ref (the path itself if it is a file)."""