docs.yml

# LLVM Documentation CI
# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

name: "Test documentation build"

permissions:
  contents: read

on:
  push:
    branches:
      - 'main'
    paths:
      - 'llvm/docs/**'
      - 'clang/docs/**'
      - 'clang-tools-extra/docs/**'
      - 'lldb/docs/**'
  pull_request:
    paths:
      - 'llvm/docs/**'
      - 'clang/docs/**'
      - 'clang-tools-extra/docs/**'
      - 'lldb/docs/**'

jobs:
  check-docs-build:
    name: "Test documentation build"
    runs-on: ubuntu-latest
    steps:
      # Fetch all the commits in a pull request + 1 so that the
      # docs-changed-subprojects step won't pull them in itself in an extremely
      # slow manner.
      - name: Calculate number of commits to fetch (PR)
        if: ${{ github.event_name == 'pull_request' }} 
        run: echo "PR_FETCH_DEPTH=$(( ${{ github.event.pull_request.commits }} + 1 ))" >> "${GITHUB_ENV}"
      - name: Fetch LLVM sources (PR)
        if: ${{ github.event_name == 'pull_request' }}
        uses: actions/checkout@v4
        with:
          fetch-depth: ${{ env.PR_FETCH_DEPTH }}
      - name: Fetch LLVM sources (push)
        if: ${{ github.event_name == 'push' }}
        uses: actions/checkout@v4
        with:
          fetch-depth: 1
      - name: Get subprojects that have doc changes
        id: docs-changed-subprojects
        uses: tj-actions/changed-files@v39
        with:
          files_yaml: |
            llvm:
              - 'llvm/docs/**'
            clang:
              - 'clang/docs/**'
            clang-tools-extra:
              - 'clang-tools-extra/docs/**'
            lldb:
              - 'lldb/docs/**'
      - name: Setup Python env
        uses: actions/setup-python@v4
        with:
          python-version: '3.11'
          cache: 'pip'
          cache-dependency-path: 'llvm/docs/requirements.txt'
      - name: Install python dependencies
        run: pip install -r llvm/docs/requirements.txt
      - name: Install system dependencies
        run: |
          sudo apt-get update
          # swig and graphviz are lldb specific dependencies
          sudo apt-get install -y cmake ninja-build swig graphviz
      - name: Build LLVM docs
        if: steps.docs-changed-subprojects.outputs.llvm_any_changed == 'true'
        run: |
          cmake -B llvm-build -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_SPHINX=ON ./llvm
          TZ=UTC ninja -C llvm-build docs-llvm-html docs-llvm-man
      - name: Build Clang docs
        if: steps.docs-changed-subprojects.outputs.clang_any_changed == 'true'
        run: |
          cmake -B clang-build -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS="clang" -DLLVM_ENABLE_SPHINX=ON ./llvm
          TZ=UTC ninja -C clang-build docs-clang-html docs-clang-man
      - name: Build clang-tools-extra docs
        if: steps.docs-changed-subprojects.outputs.clang-tools-extra_any_changed == 'true'
        run: |
          cmake -B clang-tools-extra-build -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra" -DLLVM_ENABLE_SPHINX=ON ./llvm
          TZ=UTC ninja -C clang-tools-extra-build docs-clang-tools-html docs-clang-tools-man
      - name: Build LLDB docs
        if: steps.docs-changed-subprojects.outputs.lldb_any_changed == 'true'
        run: |
          cmake -B lldb-build -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_PROJECTS="clang;lldb" -DLLVM_ENABLE_SPHINX=ON ./llvm
          TZ=UTC ninja -C lldb-build docs-lldb-html docs-lldb-man