release.yml

name: Release

on:
  push:
    branches: [main]
    paths: [gradle.properties]
  workflow_dispatch:

permissions:
  contents: write
  issues: write
  pull-requests: read

jobs:
  release:
    name: Tag and release
    if: github.ref == 'refs/heads/main'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
        with:
          fetch-depth: 0
          persist-credentials: false

      - name: Read version
        id: version
        run: |
          version=$(grep '^VERSION_NAME=' gradle.properties | cut -d= -f2)
          # AndroidX-style versions only: 1.2.0, or 1.2.0-alpha01 / -beta01 / -rc01 for pre-releases.
          if ! [[ "$version" =~ ^[0-9]+\.[0-9]+\.[0-9]+(-(alpha|beta|rc)[0-9]{2})?$ ]]; then
            echo "::error::VERSION_NAME=${version} isn't X.Y.Z or X.Y.Z-(alpha|beta|rc)NN"
            exit 1
          fi
          echo "version=${version}" >> "$GITHUB_OUTPUT"
          if [[ "$version" == *-* ]]; then echo "prerelease=true" >> "$GITHUB_OUTPUT"; else echo "prerelease=false" >> "$GITHUB_OUTPUT"; fi
          if git rev-parse -q --verify "refs/tags/v${version}" >/dev/null; then
            echo "exists=true" >> "$GITHUB_OUTPUT"
            echo "v${version} is already released"
          else
            echo "exists=false" >> "$GITHUB_OUTPUT"
          fi

      - uses: actions/setup-java@b843ebf9b913146b38da2eaa7aeddf76074ae1ad
        if: steps.version.outputs.exists == 'false'
        with:
          distribution: temurin
          java-version: 17
      - uses: gradle/actions/setup-gradle@8da46b539cd8fe6ab27ca75128919a18d757604c
        if: steps.version.outputs.exists == 'false'

      - name: Build and test
        if: steps.version.outputs.exists == 'false'
        run: ./gradlew ktlintCheck lintRelease apiCheck assembleRelease testDebugUnitTest publishToMavenLocal

      - name: Release notes from CHANGELOG.md
        if: steps.version.outputs.exists == 'false'
        env:
          VERSION: ${{ steps.version.outputs.version }}
        run: |
          awk -v v="$VERSION" '
            $0 ~ "^## \\[" v "\\]" { found = 1; next }
            found && /^## \[/ { exit }
            found { print }
          ' CHANGELOG.md > notes.md
          if [ ! -s notes.md ]; then echo "See CHANGELOG.md" > notes.md; fi

      # Published before tagging, so a failed upload can be retried without a dangling tag.
      - name: Publish to Maven Central
        if: steps.version.outputs.exists == 'false'
        env:
          ORG_GRADLE_PROJECT_mavenCentralUsername: ${{ secrets.MAVEN_CENTRAL_USERNAME }}
          ORG_GRADLE_PROJECT_mavenCentralPassword: ${{ secrets.MAVEN_CENTRAL_PASSWORD }}
          ORG_GRADLE_PROJECT_signingInMemoryKey: ${{ secrets.SIGNING_KEY }}
          ORG_GRADLE_PROJECT_signingInMemoryKeyPassword: ${{ secrets.SIGNING_KEY_PASSWORD }}
        run: ./gradlew publishAndReleaseToMavenCentral --no-configuration-cache

      - name: Create tag and GitHub release
        if: steps.version.outputs.exists == 'false'
        env:
          GH_TOKEN: ${{ github.token }}
          VERSION: ${{ steps.version.outputs.version }}
          PRERELEASE: ${{ steps.version.outputs.prerelease }}
        run: |
          flags=()
          if [ "$PRERELEASE" = "true" ]; then flags+=(--prerelease); fi
          gh release create "v${VERSION}" --target "${GITHUB_SHA}" --title "v${VERSION}" --notes-file notes.md "${flags[@]}"

      - name: Close milestone
        if: steps.version.outputs.exists == 'false'
        env:
          GH_TOKEN: ${{ github.token }}
          VERSION: ${{ steps.version.outputs.version }}
        run: |
          # Close the vX.Y.Z milestone, or rename and close a "Next release" one. Pre-releases leave it open.
          if [[ "$VERSION" == *-* ]]; then exit 0; fi
          number=$(gh api "repos/${GITHUB_REPOSITORY}/milestones?state=open" \
            --jq "[.[] | select(.title == \"v${VERSION}\" or .title == \"Next release\")][0].number // empty")
          if [ -n "$number" ]; then
            gh api -X PATCH "repos/${GITHUB_REPOSITORY}/milestones/${number}" -f title="v${VERSION}" -f state=closed
          fi