Merge pull request #4716 from hugovk/pre-commit-diff

CI: Show diff when pre-commit fails

.github/workflows/lint.yml

@@ -16,7 +16,7 @@
     - uses: actions/checkout@v2
 
     - name: pip cache
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: ~/.cache/pip
         key: lint-pip-${{ hashFiles('**/setup.py') }}
@@ -46,4 +46,6 @@
 
     - name: Lint
       run: tox -e lint
+      env:
+        PRE_COMMIT_COLOR: always
 

setup.cfg

@@ -9,5 +9,5 @@
 multi_line_output = 3
 
 [tool:pytest]
-addopts = -ra
+addopts = -ra --color=yes
 testpaths = Tests

tox.ini

@@ -24,9 +24,9 @@
 
 [testenv:lint]
 commands =
-    pre-commit run --all-files
+    pre-commit run --all-files --show-diff-on-failure
     check-manifest
 deps =
     pre-commit
     check-manifest
 skip_install = true
@@ -28,5 +28,6 @@
     check-manifest
 deps =
     pre-commit
     check-manifest
 skip_install = true
+passenv = PRE_COMMIT_COLOR