From 9b6224e92891b7c94e08091f463f7213239c0ec1 Mon Sep 17 00:00:00 2001
From: Nicklas af Ekenstam <n@nille.dev>
Date: Wed, 15 Apr 2026 11:49:01 +0200
Subject: [PATCH] feat: Auto version bump on merge to main

GitHub Action that runs on push to main:
- Parses squash commit title for bump type (feat: -> minor, fix: -> patch)
- Bumps __version__ in shipkit/__init__.py
- Commits and tags (v0.1.14, etc.)
- Skips its own commits to prevent infinite loops
---
 .github/workflows/version-bump.yml | 90 ++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 .github/workflows/version-bump.yml

diff --git a/.github/workflows/version-bump.yml b/.github/workflows/version-bump.yml
new file mode 100644
index 0000000..2924c48
--- /dev/null
+++ b/.github/workflows/version-bump.yml
@@ -0,0 +1,90 @@
+name: Version Bump
+
+on:
+  push:
+    branches: [main]
+
+# Prevent concurrent version bumps
+concurrency:
+  group: version-bump
+  cancel-in-progress: false
+
+jobs:
+  bump:
+    runs-on: ubuntu-latest
+    # Skip if the commit was made by this action (prevent infinite loop)
+    if: "!startsWith(github.event.head_commit.message, 'v')"
+
+    permissions:
+      contents: write
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Determine bump type from commit message
+        id: bump
+        run: |
+          MSG="${{ github.event.head_commit.message }}"
+          # Extract first line of squash commit message
+          FIRST_LINE=$(echo "$MSG" | head -1)
+
+          if echo "$FIRST_LINE" | grep -qiE '^breaking[:(]|BREAKING CHANGE'; then
+            echo "type=major" >> "$GITHUB_OUTPUT"
+          elif echo "$FIRST_LINE" | grep -qiE '^feat[:(]'; then
+            echo "type=minor" >> "$GITHUB_OUTPUT"
+          else
+            echo "type=patch" >> "$GITHUB_OUTPUT"
+          fi
+
+          echo "Commit: $FIRST_LINE"
+          echo "Bump type: $(cat "$GITHUB_OUTPUT" | grep type | cut -d= -f2)"
+
+      - name: Read current version
+        id: current
+        run: |
+          VERSION=$(python3 -c "
+          import re
+          with open('shipkit/__init__.py') as f:
+              match = re.search(r'__version__ = \"(.+?)\"', f.read())
+              print(match.group(1))
+          ")
+          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
+          echo "Current version: $VERSION"
+
+      - name: Calculate new version
+        id: new
+        run: |
+          IFS='.' read -r MAJOR MINOR PATCH <<< "${{ steps.current.outputs.version }}"
+          BUMP="${{ steps.bump.outputs.type }}"
+
+          if [ "$BUMP" = "major" ]; then
+            MAJOR=$((MAJOR + 1))
+            MINOR=0
+            PATCH=0
+          elif [ "$BUMP" = "minor" ]; then
+            MINOR=$((MINOR + 1))
+            PATCH=0
+          else
+            PATCH=$((PATCH + 1))
+          fi
+
+          NEW_VERSION="$MAJOR.$MINOR.$PATCH"
+          echo "version=$NEW_VERSION" >> "$GITHUB_OUTPUT"
+          echo "New version: $NEW_VERSION ($BUMP bump)"
+
+      - name: Update version in __init__.py
+        run: |
+          sed -i "s/__version__ = \".*\"/__version__ = \"${{ steps.new.outputs.version }}\"/" shipkit/__init__.py
+          cat shipkit/__init__.py
+
+      - name: Commit and tag
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add shipkit/__init__.py
+          git commit -m "v${{ steps.new.outputs.version }}"
+          git tag "v${{ steps.new.outputs.version }}"
+          git push origin main --tags