optimize-images.yml

name: Optimize Images

on:
  push:
    branches: [main, prerelease]
    paths:
      - '**/*.png'

permissions:
  contents: write

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

env:
  OXIPNG_VERSION: "10.1.0"

jobs:
  optimize-png:
    runs-on: ubuntu-latest
    steps:
      - name: Check out repository
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
        with:
          fetch-depth: 0

      - name: Install oxipng
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          mkdir -p "$RUNNER_TEMP/oxipng"
          gh release download "v${OXIPNG_VERSION}" \
            --repo oxipng/oxipng \
            --pattern "*x86_64-unknown-linux-musl.tar.gz" \
            --output - | tar xz --strip-components=1 -C "$RUNNER_TEMP/oxipng"

      - name: Get changed PNG files
        id: changed-pngs
        uses: tj-actions/changed-files@22103cc46bda19c2b464ffe86db46df6922fd323 # v47.0.5
        with:
          files: '**/*.png'
          separator: '\n'

      - name: Optimize PNGs
        if: steps.changed-pngs.outputs.any_changed == 'true'
        env:
          ALL_CHANGED_FILES: ${{ steps.changed-pngs.outputs.all_changed_files }}
        run: |
          echo "$ALL_CHANGED_FILES" | while IFS= read -r file; do
            if [ -f "$file" ]; then
              echo "Optimizing: $file"
              "$RUNNER_TEMP/oxipng/oxipng" -o 4 -i 0 --strip safe "$file"
            fi
          done

      - name: Commit optimized images
        uses: stefanzweifel/git-auto-commit-action@04702edda442b2e678b25b537cec683a1493fcb9 # v7
        with:
          commit_message: "Optimize PNG images with oxipng"
          commit_user_name: github-actions[bot]
          commit_user_email: 41898282+github-actions[bot]@users.noreply.github.com
          commit_author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
          file_pattern: '**/*.png'