# Workflow to build binaries for a release.
# Triggered by release creation, which should include `llvm-project@<full-sha>`.
#
# Because the build takes more than an hour, our GITHUB_TOKEN credentials may
# expire. A token `secrets.RELEASE_TOKEN` must exist with public_repo scope.
name: Build release binaries
on:
  release:
    types: created
jobs:
  prepare:
    runs-on: ubuntu-latest
    steps:
    - name: Find LLVM commit
      run: |
        grep -m 1 -o "llvm-project@[[:xdigit:]]\{40,\}" << EOF | cut -f 2 -d@ > commit
        ${{ github.event.release.body }}
        EOF
    - name: Mark as draft
      run: >
        curl --fail --show-error -XPATCH
        "-HAuthorization: Bearer ${{ secrets.RELEASE_TOKEN }}"
        "https://api.github.com/repos/${{ github.repository }}/releases/${{ github.event.release.id }}"
        "-d" '{"draft": true}'
    - name: Persist release info
      uses: actions/upload-artifact@v1
      with:
        name: release
        path: commit
  # Build clangd using CMake/Ninja.
  #
  # This step is a template that runs on each OS, build config varies slightly.
  # Uploading releases needs a per-job token that expires after an hour.
  build:
    name: Build ${{ matrix.config.name }}
    needs: prepare
    runs-on: ${{ matrix.config.os }}
    strategy:
      fail-fast: false
      matrix:
        config:
        - name: windows
          os: windows-latest
          preinstall: choco install ninja
          vcvars: C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvars64.bat
          cflags: /O2 /DNDEBUG
          # FIXME: remove ALLOW_OLD_TOOLCHAIN once VS 16.5 is available.
          cmake: >
            "-DCMAKE_C_COMPILER=cl"
            "-DCMAKE_CXX_COMPILER=cl"
            "-DLLVM_ENABLE_ZLIB=OFF"
            "-DLLVM_USE_CRT_RELEASE=MT"
            "-DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN=ON"
        - name: mac
          os: macos-latest
          preinstall: brew install ninja zlib p7zip
          cflags: -O3 -gline-tables-only -DNDEBUG
          cmake: >
            "-DCMAKE_C_COMPILER=clang"
            "-DCMAKE_CXX_COMPILER=clang++"
            "-DLLVM_ENABLE_ZLIB=FORCE_ON"
        - name: linux
          os: ubuntu-latest
          preinstall: sudo apt-get install ninja-build libz-dev
          cflags: -O3 -gline-tables-only -DNDEBUG -include $GITHUB_WORKSPACE/.github/workflows/lib_compat.h
          cmake: >
            "-DCMAKE_C_COMPILER=clang"
            "-DCMAKE_CXX_COMPILER=clang++"
            "-DCMAKE_EXE_LINKER_FLAGS_RELEASE=-static-libgcc -Wl,--compress-debug-sections=zlib"
            "-DLLVM_STATIC_LINK_CXX_STDLIB=ON"
            "-DLLVM_ENABLE_ZLIB=FORCE_ON"
    steps:
    - name: Clone scripts
      uses: actions/checkout@v2
      with: { ref: master }
    - name: Install tools
      run: ${{ matrix.config.preinstall }}
    # Visual Studio tools require a bunch of environment variables to be set.
    # Run vcvars64.bat and re-export the current environment to the workflow.
    # (It'd be nice to only export the variables that *changed*, oh well).
    - name: Visual Studio environment
      if: matrix.config.name == 'windows'
      shell: powershell
      run: |
        cmd /c "`"${{ matrix.config.vcvars }}`">NUL && set" | Foreach-Object {
          $name, $value = $_ -split '=', 2
          if ($value) { echo "::set-env name=$($name)::$($value)" }
        }
    - name: Fetch target commit
      uses: actions/download-artifact@v1
      with: { name: release }
    - name: Set target commit
      run: |
        echo ::set-env name=LLVM_COMMIT::$(cat release/commit)
        echo ::set-env name=CLANGD_DIR::clangd_${{ github.event.release.tag_name }}
      shell: bash
    - name: Clone LLVM
      uses: actions/checkout@v2
      with:
        repository: llvm/llvm-project
        path: llvm-project
        ref: ${{ env.LLVM_COMMIT }}
    - name: CMake
      run: >
        mkdir ${{ env.CLANGD_DIR }}

        cp llvm-project/llvm/LICENSE.TXT ${{ env.CLANGD_DIR }}

        cmake -G Ninja -S llvm-project/llvm -B ${{ env.CLANGD_DIR }}
        "-DLLVM_ENABLE_PROJECTS=clang;clang-tools-extra"
        "-DLLVM_ENABLE_ASSERTIONS=OFF"
        "-DLLVM_ENABLE_BACKTRACES=ON"
        "-DLLVM_ENABLE_TERMINFO=OFF"
        "-DCMAKE_BUILD_TYPE=Release"
        "-DCLANG_PLUGIN_SUPPORT=OFF"
        "-DLLVM_ENABLE_PLUGINS=OFF"
        "-DCMAKE_C_FLAGS_RELEASE=${{ matrix.config.cflags }}"
        "-DCMAKE_CXX_FLAGS_RELEASE=${{ matrix.config.cflags }}"
        ${{ matrix.config.cmake }}
    # LLVM 10 has no way to statically link zlib via CMake itself, AFAICT...
    - name: Statically link zlib
      if: matrix.config.name == 'linux'
      run: sed -i 's/ -lz / -l:libz.a /' "$CLANGD_DIR/build.ninja"
    - name: Ninja
      run: ninja -C ${{ env.CLANGD_DIR }} clangd
    - name: Archive
      run: >
        7z a clangd.zip
        ${{ env.CLANGD_DIR }}/LICENSE.TXT
        ${{ env.CLANGD_DIR }}/bin/clangd*
        ${{ env.CLANGD_DIR }}/lib/clang
    - name: Upload artifact
      uses: actions/upload-artifact@v1
      with:
        name: ${{ matrix.config.name }}
        path: clangd.zip
    - name: Upload asset
      uses: actions/upload-release-asset@v1.0.1
      env: { GITHUB_TOKEN: "${{ secrets.RELEASE_TOKEN }}" }
      with:
        upload_url: ${{ github.event.release.upload_url }}
        asset_name: clangd-${{ matrix.config.name }}-${{ github.event.release.tag_name }}.zip
        asset_path: clangd.zip
        asset_content_type: application/zip
  # Create the release, and upload the artifacts to it.
  finalize:
    runs-on: ubuntu-latest
    needs: build
    steps:
    - name: Publish release
      run: >
        curl -XPATCH
        "-HAuthorization: Bearer ${{ secrets.RELEASE_TOKEN }}"
        "https://api.github.com/repos/${{ github.repository }}/releases/${{ github.event.release.id }}"
        "-d" '{"draft": false}'