emscripten.yml

name: Emscripten

on:
  push:
    branches: [master, ci]
  pull_request:
  workflow_dispatch:

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
    - name: Cancel previous runs
      uses: styfle/cancel-workflow-action@0.12.1
      with:
          access_token: ${{ github.token }}
          all_but_latest: true

    - name: Checkout Base Repo
      uses: actions/checkout@v4

    - name: Prepare Submodules
      run: |
        git submodule sync
        git submodule update --init --recursive --force
        mv lib lib_

    - name: Calculate Hash Key
      id: cache_config
      run: |
        # Invalidate cache if submodules, patches or emscripten version changed
        key="$(find build/patches/ -type f | sort | xargs cat .gitmodules Dockerfile \
               Makefile Makefile_licence | shasum -a 256 | cut -d' ' -f1)"
        echo "key=0-${key}" >> $GITHUB_OUTPUT

    - name: Ensure Cache will be newer than Checkout
      run: |
        find . -exec touch -d 1971-01-01T00:00:00 '{}' +

    - name: Retrieve Cached Built Dependencies
      uses: actions/cache@v4
      id: cache
      with:
        key: ${{ steps.cache_config.outputs.key }}
        path: |
          lib
          build/lib
          dist/libraries
          dist/license/*
          !dist/license/subtitlesoctopus
          !dist/license/all*
          /tmp/emcc_lto

    - name: Checkout Submodules
      if: steps.cache.outputs.cache-hit != 'true'
      run: |
        mv lib_ lib

    - name: Build Docker Image
      run: |
        docker build -t libass/jso .

    - name: Build Binaries
      run: |
        mkdir -p /tmp/emcc_lto
        docker run --rm --env LC_ALL=C.UTF-8 -v "${PWD}":/code -v "/tmp/emcc_lto:/emsdk/upstream/emscripten/cache/sysroot/lib/wasm32-emscripten/lto" libass/jso:latest

    - name: Upload Nightly Build
      uses: actions/upload-artifact@v4
      if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && github.ref == 'refs/heads/master'
      with:
        name: js
        path: dist/js


  update_gh-pages:
    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && github.ref == 'refs/heads/master'
    needs: build
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          ref: gh-pages

      - name: Remove old assets
        run: rm -fr assets/js

      - name: Download nightly build
        uses: actions/download-artifact@v4
        with:
          name: js
          path: assets/js

      - name: Push new version
        run: |
          git config --global user.email "actions@noreply.github.com"
          git config --global user.name "GitHub Action"
          git add assets/js
          (git commit -m "$(printf \
            "Update binaries to latest nightly\n\nFrom %s" "${{ github.sha }}")" \
           && git push origin gh-pages) \
           || : # Ignore if nothing changed