Add autoflake to pre-commit and reorder the check

Co-Authored-By: Pierre Sassoulas <[email protected]>

Author: graingert

.pre-commit-config.yaml

@@ -1,10 +1,15 @@
 repos:
--   repo: https://github.com/ambv/black
-    rev: 20.8b1
+-   repo: https://github.com/myint/autoflake
+    rev: v1.4
     hooks:
-    - id: black
-      args: [--safe, --quiet]
-      exclude: tests/functional/|tests/input|tests/extensions/data|tests/regrtest_data/|tests/data/
+    -   id: autoflake
+        exclude: &fixtures tests/functional/|tests/input|tests/extensions/data|tests/regrtest_data/|tests/data/
+        args:
+            - --in-place
+            - --remove-all-unused-imports
+            - --expand-star-imports
+            - --remove-duplicate-keys
+            - --remove-unused-variables
 -   repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v2.1.0
     hooks:
@@ -14,3 +19,9 @@ repos:
     rev: 5.5.2
     hooks:
     -   id: isort
+-   repo: https://github.com/ambv/black
+    rev: 20.8b1
+    hooks:
+    - id: black
+      args: [--safe, --quiet]
+      exclude: *fixtures