name: CI
on: [push, pull_request]

env:
  # Update the language picker in index.hbs to link new languages.
  LANGUAGES:

jobs:
  test:
    name: Run tests
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
      with:
        # We need the full history below.
        fetch-depth: 0

    - name: Update rustup
      run: rustup self update

    - name: Install Rust
      run: |
        rustup set profile minimal
        rustup toolchain install nightly -c rust-docs
        rustup default nightly

    - name: Install mdbook
      run: |
        mkdir bin
        curl -sSL https://github.com/rust-lang/mdBook/releases/download/v0.4.15/mdbook-v0.4.15-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
        echo "$(pwd)/bin" >> ${GITHUB_PATH}

    - name: Install mdbook-i18n-helpers
      run: |
        cargo install mdbook-i18n-helpers --locked --version 0.3.0

    - name: Report versions
      run: |
        rustup --version
        rustc -Vv
        mdbook --version

    - name: Run tests
      run: mdbook test

    - name: Build HTML
      run: mdbook build

    - name: Check for broken links
      run: |
        curl -sSLo linkcheck.sh \
          https://raw.githubusercontent.com/rust-lang/rust/master/src/tools/linkchecker/linkcheck.sh
        sh linkcheck.sh --all rust-by-example

    - name: Build all translations
      run: |
        for po_lang in ${{ env.LANGUAGES }}; do
          POT_CREATION_DATE=$(grep --max-count 1 '^"POT-Creation-Date:' po/$po_lang.po | sed -E 's/".*: (.*)\\n"/\1/')
          if [[ $POT_CREATION_DATE == "" ]]; then
              POT_CREATION_DATE=now
          fi

          echo "::group::Building $po_lang translation as of $POT_CREATION_DATE"
          rm -r src/
          git restore --source "$(git rev-list -n 1 --before "$POT_CREATION_DATE" @)" src/

          # Set language and adjust site URL. Clear the redirects
          # since they are in sync with the source files, not the
          # translation.
          MDBOOK_BOOK__LANGUAGE=$po_lang \
          MDBOOK_OUTPUT__HTML__SITE_URL=/rust-by-example/$po_lang/ \
          MDBOOK_OUTPUT__HTML__REDIRECT='{}' \
          mdbook build -d book/$po_lang
          echo "::endgroup::"
        done

    - name: Upload Artifact
      uses: actions/upload-artifact@v3
      with:
        name: rust-by-example
        path: book