librtmp2 0.7.0

name: Generate C header

on:
  workflow_dispatch:
  pull_request:
    paths:
      - "src/**"
      - "Cargo.toml"
      - "cbindgen.toml"
      - "scripts/generate-header.sh"
      - ".github/workflows/c-header.yml"
  push:
    branches:
      - main
    paths:
      - "src/**"
      - "Cargo.toml"
      - "cbindgen.toml"
      - "scripts/generate-header.sh"
      - ".github/workflows/c-header.yml"

permissions:
  contents: read

concurrency:
  group: c-header-${{ github.ref }}
  cancel-in-progress: true

env:
  CBINDGEN_VERSION: "0.29.4"

jobs:
  generate:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v7
        with:
          ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.ref }}
          persist-credentials: false

      - name: Install Rust
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: "1.97"

      - name: Cache cbindgen
        uses: actions/cache@v6
        with:
          path: ~/.cargo/bin/cbindgen
          key: ${{ runner.os }}-cbindgen-${{ env.CBINDGEN_VERSION }}

      - name: Install cbindgen
        run: |
          if ! command -v cbindgen >/dev/null 2>&1 || [ "$(cbindgen --version)" != "cbindgen ${CBINDGEN_VERSION}" ]; then
            cargo install --locked --version "${CBINDGEN_VERSION}" --force cbindgen
          fi

      - name: Generate header
        run: bash scripts/generate-header.sh

      - name: Verify generated header compiles
        run: |
          cat > /tmp/librtmp2-header-check.c <<'EOF'
          #include "librtmp2/librtmp2.h"

          int main(void) {
              return 0;
          }
          EOF
          cc -std=c11 -Wall -Wextra -Werror -Iinclude -fsyntax-only /tmp/librtmp2-header-check.c

      - name: Upload generated header for pull requests
        if: github.event_name == 'pull_request'
        uses: actions/upload-artifact@v7
        with:
          name: librtmp2-c-header
          path: include/librtmp2/librtmp2.h

  publish:
    needs: generate
    if: github.event_name != 'pull_request'
    runs-on: ubuntu-latest
    permissions:
      contents: write

    steps:
      - name: Check ref is a branch
        run: |
          if [ "${GITHUB_REF#refs/heads/}" = "${GITHUB_REF}" ]; then
            echo "::notice::${GITHUB_REF} is not a branch (e.g. a tag ref from a manual run); skipping header commit."
            echo "SKIP=1" >> "$GITHUB_ENV"
          fi

      - name: Checkout
        if: env.SKIP != '1'
        uses: actions/checkout@v7
        with:
          ref: ${{ github.ref }}

      - name: Install Rust
        if: env.SKIP != '1'
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: "1.97"

      - name: Cache cbindgen
        if: env.SKIP != '1'
        uses: actions/cache@v6
        with:
          path: ~/.cargo/bin/cbindgen
          key: ${{ runner.os }}-cbindgen-${{ env.CBINDGEN_VERSION }}

      - name: Install cbindgen
        if: env.SKIP != '1'
        run: |
          if ! command -v cbindgen >/dev/null 2>&1 || [ "$(cbindgen --version)" != "cbindgen ${CBINDGEN_VERSION}" ]; then
            cargo install --locked --version "${CBINDGEN_VERSION}" --force cbindgen
          fi

      - name: Generate header
        if: env.SKIP != '1'
        run: bash scripts/generate-header.sh

      - name: Commit generated header
        if: env.SKIP != '1'
        run: |
          if git diff --quiet -- include/librtmp2/librtmp2.h && git ls-files --error-unmatch include/librtmp2/librtmp2.h >/dev/null 2>&1; then
            echo "Header is already up to date."
            exit 0
          fi

          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"

          git add include/librtmp2/librtmp2.h
          git commit -m "Update generated C header"

          for attempt in 1 2 3 4 5; do
            if git push; then
              exit 0
            fi

            echo "Push rejected (attempt ${attempt}); rebasing onto latest ${GITHUB_REF_NAME} and retrying..."
            git fetch origin "${GITHUB_REF_NAME}"
            git rebase "origin/${GITHUB_REF_NAME}"
            bash scripts/generate-header.sh
            if git diff --quiet -- include/librtmp2/librtmp2.h; then
              echo "Header now matches latest ${GITHUB_REF_NAME}; nothing to push."
              continue
            fi
            git add include/librtmp2/librtmp2.h
            git commit --amend --no-edit
          done

          echo "Failed to push generated header after multiple retries." >&2
          exit 1