ocaml.yml

name: Main workflow

on:
  pull_request:
    branches: [main]
  push:
    branches: [main]
    tags:
      [
        "v[0-9]+",
        "v[0-9]+.[0-9]+",
        "v[0-9]+.[0-9]+.[0-9]+",
        "v[0-9]+.[0-9]+.[0-9]+-*",
      ]

jobs:
  # We have two separate build jobs:
  # - build-test-doc should run only once (one OS, one OCaml version), to avoid
  #   needlessly building the doc artifact repeatedly
  # - build-test can run on as many version as we want
  # - doc is also only run once, and only on push events, not on pull requests
  build-test-doc:
    strategy:
      fail-fast: false
      matrix:
        os:
          - ubuntu-latest
          # - macos-latest
          # - windows-latest
        ocaml-compiler:
          - 4.14.x

    runs-on: ${{ matrix.os }}
    outputs:
      ref: ${{ steps.vars.outputs.ref }}

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Use OCaml ${{ matrix.ocaml-compiler }}
        uses: ocaml/setup-ocaml@v2
        with:
          ocaml-compiler: ${{ matrix.ocaml-compiler }}

      - name: Install dependencies
        run: opam install . --deps-only --with-test

      - name: Build library
        run: opam exec -- dune build

      - name: Run unit tests
        run: opam exec -- dune test

      - name: Build documentation
        run: |
          opam install . --deps-only --with-doc
          opam exec -- dune build @doc

      - id: vars
        shell: bash
        run: echo "ref=$(echo ${GITHUB_REF#refs/*/})" >> ${GITHUB_OUTPUT}

      - uses: actions/upload-artifact@v4
        if: github.event_name == 'push' &&
          ( github.ref == 'refs/heads/main' || startsWith(github.ref,'refs/tags') )
        with:
          name: doc-${{ steps.vars.outputs.ref }}
          path: _build/default/_doc/_html/patricia-tree/

  build-test:
    strategy:
      fail-fast: false
      matrix:
        os:
          - ubuntu-latest
          # - macos-latest
          # - windows-latest
        ocaml-compiler:
          - 5.1.x

    runs-on: ${{ matrix.os }}

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Use OCaml ${{ matrix.ocaml-compiler }}
        uses: ocaml/setup-ocaml@v2
        with:
          ocaml-compiler: ${{ matrix.ocaml-compiler }}

      - name: Install dependencies
        run: opam install . --deps-only --with-test

      - name: Build library
        run: opam exec -- dune build

      - name: Run unit tests
        run: opam exec -- dune test

  doc:
    needs: build-test-doc
    if: github.event_name == 'push' &&
      ( github.ref == 'refs/heads/main' || startsWith(github.ref,'refs/tags') )
    permissions:
      contents: write
    runs-on: ubuntu-latest
    steps:
      - name: Checkout gh-pages
        uses: actions/checkout@v4
        with:
          ref: gh-pages
      - name: Remove previous doc
        run: rm -rf ${{ needs.build-test-doc.outputs.ref }}
      - name: Retrieve new documentation
        uses: actions/download-artifact@v4
        with:
          name: doc-${{ needs.build-test-doc.outputs.ref }}
          path: ${{ needs.build-test-doc.outputs.ref }}
      - name: Deploy documentation
        run: |
          git config user.email "${{ github.actor }}@users.noreply.github.com"
          git config user.name "${{ github.actor }}"
          git add ${{ needs.build-test-doc.outputs.ref }}
          if ! git diff --cached --quiet --exit-code;
          then
            git commit -m "Deploy ${GITHUB_SHA}"
            git push -f "https://${{ github.actor }}:${{ github.token }}@github.com/${{ github.repository }}.git" gh-pages
          else
            echo "No changes to push"
          fi