non compliant commit for PR.

.github/workflows/pre-commit.yaml

@@ -18,9 +18,13 @@ on:
 jobs:
   pre-commit:
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
     steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref || github.ref_name }}
 
       - name: Set up Python
         id: setup-python
@@ -45,15 +49,30 @@ jobs:
           pre-commit install
 
       - name: Run pre-commit hooks
+        continue-on-error: true
         working-directory: ${{ inputs.working-directory }}
         run: |
-          git ls-files | xargs pre-commit run \
-                         --show-diff-on-failure \
-                         --color=always \
-                         --files
+          git fetch --no-tags --depth=1 origin "${{ github.base_ref }}:refs/remotes/origin/${{ github.base_ref }}"
+          if [ "${{ github.event_name }}" = "pull_request" ]; then
+            pre-commit run \
+              --from-ref "origin/${{ github.base_ref }}" \
+              --to-ref "HEAD" \
+              --show-diff-on-failure \
+              --color=always
+          else
+            pre-commit run \
+              --from-ref "HEAD~1" \
+              --to-ref "HEAD" \
+              --show-diff-on-failure \
+              --color=always
+          fi
 
       - name: Commit if changes
-        if: github.event_name == 'pull_request'
+        # always() bypasses the error code from pre-commit.
+        # don't run again if this review has been triggered by github-actions[bot],
+        #   since this would create an action loop.
+        if: github.event_name == 'pull_request' && github.actor != 'github-actions[bot]'
+        # Normally github message would include [skip ci] to prevent loops, but since this is the pre-commit fixer, it should be stable.
         run: |
           git config user.name "github-actions[bot]"
           git config user.email "github-actions[bot]@users.noreply.github.com"
@@ -62,3 +81,21 @@ jobs:
             git commit -m "chore: auto-format code [skip ci]"
             git push
           fi
+
+      - name: Re-run pre-commit hooks
+        working-directory: ${{ inputs.working-directory }}
+        run: |
+          git fetch --no-tags --depth=1 origin "${{ github.base_ref }}:refs/remotes/origin/${{ github.base_ref }}"
+          if [ "${{ github.event_name }}" = "pull_request" ]; then
+            pre-commit run \
+              --from-ref "origin/${{ github.base_ref }}" \
+              --to-ref "HEAD" \
+              --show-diff-on-failure \
+              --color=always
+          else
+            pre-commit run \
+              --from-ref "HEAD~1" \
+              --to-ref "HEAD" \
+              --show-diff-on-failure \
+              --color=always
+          fi

README.md

@@ -1,2 +1,3 @@
 # test_github_workflows
+
 Test github workflows

src/main.c

@@ -2,8 +2,7 @@
 #include "mylib.h"
 
 int main(void) {
-    int x =   3
-	    ;
+    int x = 3;
     printf("%s\n", greet("World"));
     return 0;
 }