Merge pull request #11 from git-mastery/woojiahao/support-auto-tag-bumping

Add Action to auto-bump versions using tags

Author: woojiahao

.github/workflows/bump-version.yml

@@ -0,0 +1,64 @@
+name: Bump version tag on merge
+
+on:
+  pull_request:
+    types: [closed]
+    branches: [main]
+
+jobs:
+  tag:
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Get latest tag
+        id: latest
+        run: |
+          git fetch --tags
+          tag=$(git tag --sort=-v:refname | head -n 1)
+          echo "tag=${tag:-v0.0.0}" >> $GITHUB_OUTPUT
+
+      - name: Determine bump
+        id: bump
+        run: |
+          labels='${{ toJson(github.event.pull_request.labels.*.name) }}'
+          if echo "$labels" | grep -q "bump:major"; then
+            echo "type=major" >> $GITHUB_OUTPUT
+          elif echo "$labels" | grep -q "bump:minor"; then
+            echo "type=minor" >> $GITHUB_OUTPUT
+          elif echo "$labels" | grep -q "bump:patch"; then
+            echo "type=patch" >> $GITHUB_OUTPUT
+          else
+            echo "No bump label found" >&2
+            exit 1
+          fi
+
+      - name: Calculate next version
+        id: version
+        run: |
+          v=${{ steps.latest.outputs.tag }}
+          v=${v#v}
+          IFS=. read major minor patch <<< "$v"
+
+          case "${{ steps.bump.outputs.type }}" in
+            major) major=$((major+1)); minor=0; patch=0 ;;
+            minor) minor=$((minor+1)); patch=0 ;;
+            patch) patch=$((patch+1)) ;;
+          esac
+
+          echo "next=v$major.$minor.$patch" >> $GITHUB_OUTPUT
+
+      - name: Create and push tag
+        run: |
+          git config --global user.name "GitHub Actions"
+          git config --global user.email "actions@github.com"
+
+          git tag ${{ steps.version.outputs.next }}
+          git push origin ${{ steps.version.outputs.next }}