add format CI

.github/workflows/Format.yml

@@ -0,0 +1,105 @@
+name: 'Format'
+
+on:
+  pull_request_target:
+    paths: ['**/*.jl']
+    types: [opened, synchronize, reopened, ready_for_review]
+
+permissions:
+  contents: read
+  actions: write
+  pull-requests: write
+
+jobs:
+  runic:
+    runs-on: ubuntu-latest
+    if: github.event.pull_request.draft == false
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v5
+        with:
+          ref: ${{github.event.pull_request.head.ref}}
+          repository: ${{github.event.pull_request.head.repo.full_name}}
+          fetch-depth: 0
+
+      - name: Add upstream remote
+        run: |
+          git remote add upstream https://github.com/${{ github.repository }}
+          git fetch upstream
+
+      - name: Setup Julia
+        uses: julia-actions/setup-julia@v2
+        with:
+          version: '1'
+          arch: 'x64'
+      - uses: julia-actions/cache@v2
+
+      - name: Install Runic
+        run: |
+          julia --project=@runic -e 'using Pkg; Pkg.add("Runic")'
+          curl -o git-runic https://raw.githubusercontent.com/fredrikekre/Runic.jl/master/bin/git-runic
+          chmod +x git-runic
+          sudo mv git-runic /usr/local/bin
+
+      - name: Run Runic
+        id: runic
+        run: |
+          set +e
+          MERGE_BASE=$(git merge-base upstream/${{ github.base_ref }} HEAD) || exit 1
+          DIFF=$(git runic --diff $MERGE_BASE)
+          EXIT_CODE=$?
+
+          echo "exit_code=$EXIT_CODE" >> $GITHUB_OUTPUT
+          echo "diff<<EOF" >> $GITHUB_OUTPUT
+          echo "$DIFF" >> $GITHUB_OUTPUT
+          echo "EOF" >> $GITHUB_OUTPUT
+
+          # if Runic failed, bail out
+          [ $EXIT_CODE -eq 2 ] && exit 1 || exit 0
+
+      - name: Find comment
+        uses: peter-evans/find-comment@v3
+        id: find-comment
+        with:
+          issue-number: ${{ github.event.pull_request.number }}
+          comment-author: 'github-actions[bot]'
+          body-includes: '<!-- runic-format-summary -->'
+
+      - name: Comment formatting suggestions
+        if: steps.runic.outputs.exit_code == 1
+        uses: peter-evans/create-or-update-comment@v4
+        with:
+          comment-id: ${{ steps.find-comment.outputs.comment-id }}
+          issue-number: ${{ github.event.pull_request.number }}
+          body: |
+            <!-- runic-format-summary -->
+
+            Your PR requires formatting changes to meet the project's style guidelines.
+            Please consider running [Runic](https://github.com/fredrikekre/Runic.jl) (`git runic ${{ github.base_ref }}`) to apply these changes.
+
+            <details>
+            <summary>Click here to view the suggested changes.</summary>
+
+            ~~~diff
+            ${{ steps.runic.outputs.diff }}
+            ~~~
+
+            </details>
+          edit-mode: replace
+
+      - name: Update stale comment
+        if: steps.runic.outputs.exit_code == 0 && steps.find-comment.outputs.comment-id
+        uses: peter-evans/create-or-update-comment@v4
+        with:
+          comment-id: ${{ steps.find-comment.outputs.comment-id }}
+          issue-number: ${{ github.event.pull_request.number }}
+          body: |
+            <!-- runic-format-summary -->
+
+            Your PR no longer requires formatting changes. Thank you for your contribution!
+          edit-mode: replace
+
+      # XXX: if Github ever supports allow-failure (actions/runner#2347)
+      #- name: Propagate exit code
+      #  run: |
+      #    exit ${{ steps.runic.outputs.exit_code }}

.pre-commit-config.yaml

@@ -1,5 +1,5 @@
 repos:
   - repo: https://github.com/fredrikekre/runic-pre-commit
-    rev: v1.0.0
+    rev: v2.0.1
     hooks:
       - id: runic