UpdateReadmeVersion.yaml

name: Update README version (Maven Central)

on:
  # Keep README correct even if Central metadata lags a bit after release
  schedule:
    - cron: "23 6 * * *" # daily
  workflow_dispatch: {}
  # Best-effort: Central may lag behind a published GitHub release
  release:
    types: [published]

permissions:
  contents: write

concurrency:
  group: update-readme-version
  cancel-in-progress: false

jobs:
  update-readme:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout default branch
        uses: actions/checkout@v6
        with:
          ref: main

      - name: Resolve latest release version from Maven Central metadata
        id: resolve
        shell: bash
        run: |
          set -euo pipefail

          GROUP_ID="com.williamcallahan"
          ARTIFACT_ID="apple-maps-java"

          METADATA_URL="https://repo1.maven.org/maven2/${GROUP_ID//.//}/${ARTIFACT_ID}/maven-metadata.xml"

          echo "Fetching: ${METADATA_URL}"
          XML="$(curl -fsSL "$METADATA_URL")"

          # Extract <release>...</release> (fallback to <latest> if needed)
          RELEASE="$(printf '%s' "$XML" | sed -n 's:.*<release>\(.*\)</release>.*:\1:p' | head -n 1 || true)"
          if [[ -z "${RELEASE}" ]]; then
            RELEASE="$(printf '%s' "$XML" | sed -n 's:.*<latest>\(.*\)</latest>.*:\1:p' | head -n 1 || true)"
          fi

          if [[ -z "${RELEASE}" ]]; then
            echo "Failed to resolve release version from maven-metadata.xml"
            exit 1
          fi

          # Guardrail: don't ever write SNAPSHOT into README install snippets
          if [[ "${RELEASE}" == *SNAPSHOT* ]]; then
            echo "Resolved version is a SNAPSHOT (${RELEASE}); refusing to update README."
            exit 1
          fi

          echo "version=${RELEASE}" >> "$GITHUB_OUTPUT"
          echo "Resolved release version: ${RELEASE}"

      - name: Update README.md snippets
        shell: bash
        run: |
          set -euo pipefail

          VERSION='${{ steps.resolve.outputs.version }}'

          if [[ ! -f "README.md" ]]; then
            echo "README.md not found at repo root"
            exit 1
          fi

          # Replace only the dependency coordinates/version lines in the documented snippets.
          # This avoids rewriting unrelated occurrences of old versions elsewhere.
          perl -0777 -i -pe '
            my $v = $ENV{VERSION};

            # Gradle snippet: implementation("group:artifact:VERSION")
            s/(implementation\(\"com\.williamcallahan:apple-maps-java:)[^\"\)]+(\"\))/$1$v$2/g;

            # Maven snippet: <version>VERSION</version> within the apple-maps-java dependency block
            s#(<dependency>\s*<groupId>com\.williamcallahan</groupId>\s*<artifactId>apple-maps-java</artifactId>\s*<version>)[^<]+(</version>\s*</dependency>)#$1$v$2#gms;

          ' README.md

          echo "README.md updated to version ${VERSION}"

        env:
          VERSION: ${{ steps.resolve.outputs.version }}

      - name: Detect changes
        id: diff
        shell: bash
        run: |
          set -euo pipefail
          if git diff --quiet -- README.md; then
            echo "changed=false" >> "$GITHUB_OUTPUT"
            echo "No changes to commit."
          else
            echo "changed=true" >> "$GITHUB_OUTPUT"
            echo "README.md changed."
            git --no-pager diff -- README.md
          fi

      - name: Commit and push
        if: steps.diff.outputs.changed == 'true'
        shell: bash
        run: |
          set -euo pipefail

          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"

          git add README.md
          git commit -m "docs(readme): update dependency version to ${{ steps.resolve.outputs.version }}"
          git push