build.yml

name: Build and Deploy

on:
  push:
    branches: [ "github-actions", "lazy" ]  # Test on this branch and lazy
  pull_request:
    branches: [ "lazy" ]
  workflow_dispatch:

permissions:
  contents: read
  pages: write
  id-token: write

concurrency:
  group: "pages"
  cancel-in-progress: true

jobs:
  build:
    runs-on: ubuntu-latest
    env:
      OPAM_VERSION: "2.1.5"
      EM_VERSION: "3.1.45"
      EM_CACHE_FOLDER: 'emsdk-cache'

    steps:
    - uses: actions/checkout@v3
      with:
        submodules: 'recursive'

    - name: Setup emsdk cache
      uses: actions/cache@v3
      with:
        path: ${{ env.EM_CACHE_FOLDER }}
        key: ${{ runner.os }}-emsdk-${{ env.EM_VERSION }}

    - name: Setup emscripten
      uses: mymindstorm/setup-emsdk@v12
      with:
        version: ${{ env.EM_VERSION }}
        actions-cache-folder: ${{ env.EM_CACHE_FOLDER }}

    - name: Verify emscripten
      run: |
        emcc --version
        em++ --version

    - name: Set up OCaml
      uses: ocaml/setup-ocaml@v2
      with:
        ocaml-compiler: '5.2.1'
        dune-cache: false

    - name: Install system dependencies
      run: |
        sudo apt-get update
        sudo apt-get install -y pkg-config libgmp-dev

    - name: Install OCaml dependencies
      run: |
        opam install . --deps-only --with-test
        opam install js_of_ocaml js_of_ocaml-ppx js_of_ocaml-lwt js_of_ocaml-tyxml cohttp-lwt-jsoo yojson base64 xml-light

    # First build attempt - if GSL is already built
    - name: Try initial build
      continue-on-error: true
      id: initial_build
      run: |
        opam exec -- dune build @build_js
        opam exec -- dune build @deploy

    # Build GSL if initial build failed
    - name: Build GSL for emscripten
      if: steps.initial_build.outcome == 'failure'
      run: |
        cd gsl-2.8
        emconfigure ./configure
        emmake make
        cd ..

    # Retry build after GSL compilation
    - name: Rebuild after GSL
      if: steps.initial_build.outcome == 'failure'
      run: |
        opam exec -- dune build @build_js
        opam exec -- dune build @deploy

    - name: Setup Pages
      uses: actions/configure-pages@v3
        
    - name: Upload artifact
      uses: actions/upload-pages-artifact@v2
      with:
        path: './docs'

  deploy:
    needs: build
    runs-on: ubuntu-latest
    
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
      
    steps:
      - name: Deploy to GitHub Pages
        id: deployment
        uses: actions/deploy-pages@v2