Update CI auto-formate (#6237)

---------

Signed-off-by: Yash Suthar <yashsuthar983@gmail.com>
Co-authored-by: fanninpm <luxverdans@sbcglobal.net>

.github/workflows/ci.yaml

@@ -307,15 +307,13 @@ jobs:
         run: python -I whats_left.py
 
   lint:
-    name: Check Rust code with rustfmt and clippy
+    name: Check Rust code with clippy
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
       - uses: dtolnay/rust-toolchain@stable
         with:
-            components: rustfmt, clippy
-      - name: run rustfmt
-        run: cargo fmt --check
+            components: clippy
       - name: run clippy on wasm
         run: cargo clippy --manifest-path=wasm/lib/Cargo.toml -- -Dwarnings
       - uses: actions/setup-python@v6
@@ -450,3 +448,55 @@ jobs:
         run: wasmer run --dir `pwd` target/wasm32-wasip1/release/rustpython.wasm -- `pwd`/extra_tests/snippets/stdlib_random.py
       - name: run cpython unittest
         run: wasmer run --dir `pwd` target/wasm32-wasip1/release/rustpython.wasm -- `pwd`/Lib/test/test_int.py
+
+  auto_format_commit:
+    needs: [rust_tests, exotic_targets, snippets_cpython, lint, miri, wasm, wasm-wasi]
+    permissions:
+      contents: write
+      pull-requests: write
+    name: Auto-format code
+    runs-on: ubuntu-latest
+    if: ${{ !contains(github.event.head_commit.message, '[skip ci]') }}
+    concurrency:
+      group: fmt-${{ github.ref }}
+      cancel-in-progress: true
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
+          ref: ${{ github.head_ref || github.ref_name }}
+
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+
+      - name: Run cargo fmt
+        run: |
+          echo "Running cargo fmt --all"
+          cargo fmt --all
+
+      - name: Commit and push if changes
+        id: commit
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          if [ -n "$(git status --porcelain)" ]; then
+            git add -u
+            git commit -m "Auto-format code [skip ci]"
+            git push
+            echo "formatted=true" >> $GITHUB_OUTPUT
+          else
+            echo "formatted=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Comment on PR if formatting was applied
+        if: steps.commit.outputs.formatted == 'true' && github.event_name == 'pull_request'
+        uses: marocchino/sticky-pull-request-comment@v2
+        with:
+          message: |
+            Code has been automatically formatted.
+            No action needed.
+            the changes were committed with `[skip ci]`.

.github/workflows/pr-auto-commit.yaml

@@ -0,0 +1,99 @@
+name: PR Auto-format
+
+# This workflow triggers when a PR is opened/updated
+on:
+  pull_request_target:
+    types: [opened, synchronize, reopened]
+    branches:
+      - main
+      - release
+
+concurrency:
+  group: pr-fmt-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+jobs:
+  auto_format:
+    if: |
+      !contains(github.event.pull_request.labels.*.name, 'skip:ci') &&
+      !contains(github.event.pull_request.head.sha, '[skip ci]')
+    permissions:
+      contents: write
+      pull-requests: write
+      checks: read
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+
+    steps:
+      - name: Checkout PR branch
+        uses: actions/checkout@v5
+        with:
+          ref: ${{ github.event.pull_request.head.ref }}
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+          fetch-depth: 0
+
+      # Wait for all PR check runs to complete
+      - name: Wait for all checks to complete
+        uses: poseidon/wait-for-status-checks@v0.6.0
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          delay: 60
+          interval: 30
+          timeout: 7200
+
+      - name: CI completed successfully
+        run: echo "CI workflow completed successfully - proceeding with auto-format"
+
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+
+      - name: Run cargo fmt
+        run: |
+          echo "Running cargo fmt --all on PR #${{ github.event.pull_request.number }}"
+          cargo fmt --all
+
+      - name: Check for formatting changes
+        id: check_changes
+        run: |
+          if [ -n "$(git status --porcelain)" ]; then
+            echo "has_changes=true" >> $GITHUB_OUTPUT
+          else
+            echo "has_changes=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Commit and push formatting changes
+        if: steps.check_changes.outputs.has_changes == 'true'
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          
+          git add -u
+          git commit -m "Auto-format code [skip ci]"
+          
+          git push origin HEAD:${{ github.event.pull_request.head.ref }}
+
+      - name: Comment on PR
+        if: steps.check_changes.outputs.has_changes == 'true'
+        uses: marocchino/sticky-pull-request-comment@v2
+        with:
+          number: ${{ github.event.pull_request.number }}
+          message: |
+            **Code has been automatically formatted**
+            
+            The code in this PR has been formatted using `cargo fmt`.
+            The changes have been committed with `[skip ci]` to avoid triggering another CI run.
+            
+            **Triggered by commit:** `${{ github.event.pull_request.head.sha }}`  
+            **Last formatted:** ${{ github.event.pull_request.updated_at }}
+            
+            You may need to pull the latest changes before pushing again:
+            ```bash
+            git pull origin ${{ github.event.pull_request.head.ref }}
+            ```
+
+      - name: No formatting needed
+        if: steps.check_changes.outputs.has_changes == 'false'
+        run: echo "Code is already properly formatted"