release.yml

name: Release

on:
  push:
    branches: [main]
    paths:
      - 'CHANGELOG.md'

jobs:
  release:
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Get version from CHANGELOG
        id: version
        run: |
          VERSION=$(grep -m1 '^### ' CHANGELOG.md | sed 's/### \([0-9.]*\).*/\1/')
          echo "version=$VERSION" >> $GITHUB_OUTPUT
          echo "Found version: $VERSION"

      - name: Check if release exists
        id: check
        run: |
          if gh release view "v${{ steps.version.outputs.version }}" > /dev/null 2>&1; then
            echo "exists=true" >> $GITHUB_OUTPUT
          else
            echo "exists=false" >> $GITHUB_OUTPUT
          fi
        env:
          GH_TOKEN: ${{ github.token }}

      - name: Extract release notes
        if: steps.check.outputs.exists == 'false'
        id: notes
        run: |
          # Extract notes for this version (between first and second ### headers)
          NOTES=$(awk '/^### [0-9]/{if(p) exit; p=1; next} p' CHANGELOG.md)
          echo "notes<<EOF" >> $GITHUB_OUTPUT
          echo "$NOTES" >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT

      - name: Create release
        if: steps.check.outputs.exists == 'false'
        # Notes are passed through an env var, not interpolated into the shell command, so
        # changelog content can never be executed as shell syntax.
        run: |
          gh release create "v${{ steps.version.outputs.version }}" \
            --title "v${{ steps.version.outputs.version }}" \
            --notes "$RELEASE_NOTES"
        env:
          GH_TOKEN: ${{ github.token }}
          RELEASE_NOTES: ${{ steps.notes.outputs.notes }}