Load .gitignore and exclude regex at time of use

Loading .gitignore and compiling the exclude regex can take more than 15ms. We shouldn't and don't need to pay this cost if we're simply formatting files given on the command line directly. I would've loved to lazily import pathspec, but the patch won't be clean until the file collection and discovery logic is refactored first. Co-authored-by: Fabio Zadrozny <[email protected]>
psf · Aug 27, 2022 · afed2c0 · afed2c0
1 parent e269f44
commit afed2c0
Showing 1 changed file with 6 additions and 6 deletions.
diff --git a/src/black/__init__.py b/src/black/__init__.py
@@ -623,12 +623,7 @@ def get_sources(
 ) -> Set[Path]:
     """Compute the set of files to be formatted."""
     sources: Set[Path] = set()
-
-    if exclude is None:
-        exclude = re_compile_maybe_verbose(DEFAULT_EXCLUDES)
-        gitignore = get_gitignore(ctx.obj["root"])
-    else:
-        gitignore = None
+    root = ctx.obj["root"]
 
     for s in src:
         if s == "-" and stdin_filename:
@@ -663,6 +658,11 @@ def get_sources(
 
             sources.add(p)
         elif p.is_dir():
+            if exclude is None:
+                exclude = re_compile_maybe_verbose(DEFAULT_EXCLUDES)
+                gitignore = get_gitignore(root)
+            else:
+                gitignore = None
             sources.update(
                 gen_python_files(
                     p.iterdir(),