name: GnuTests

# Run the upstream GNU awk (gawk) testsuite against the Rust awk implementation
# to track and guard byte-for-byte compatibility. See util/run-gnu-testsuite.sh.

on:
  pull_request:
  push:
    branches:
      - '*'

permissions:
  contents: write # Publish awk instead of discarding

# End the current execution if there is a new changeset in the PR.
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}

env:
  DEFAULT_BRANCH: ${{ github.event.repository.default_branch }}
  TEST_FULL_SUMMARY_FILE: 'awk-gnu-full-result.json'

jobs:
  native:
    name: Run GNU awk testsuite
    runs-on: ubuntu-26.04
    steps:
    - name: Checkout code (awk)
      uses: actions/checkout@v7
      with:
        path: 'awk'
        persist-credentials: false
    - uses: dtolnay/rust-toolchain@master
      with:
        toolchain: stable
    - uses: Swatinem/rust-cache@v2
      with:
        workspaces: "./awk -> target"

    - name: Install GNU awk build dependencies
      shell: bash
      run: |
        ## gawk's ./configure (which generates test/Makefile) needs a C toolchain
        sudo apt-get update
        sudo apt-get install -y build-essential autoconf automake gettext bison

    - name: Fetch GNU awk testsuite
      shell: bash
      run: |
        ## Download and extract the upstream GNU awk release tarball
        mkdir -p gnu.awk
        cd gnu.awk
        bash ../awk/util/fetch-gnu.sh

    - name: Build Rust awk binary
      shell: bash
      run: |
        cd 'awk'
        cargo build --release --config=profile.release.strip=true
        tar -C target/release -cf - awk | zstd -19 -o ../awk-x86_64-unknown-linux-gnu.tar.zst
    - name: Publish latest commit
      uses: softprops/action-gh-release@v3
      if: github.event_name == 'push' && github.ref == 'refs/heads/main'
      with:
        tag_name: latest-commit
        body: |
          commit: ${{ github.sha }}
        draft: false
        prerelease: true
        files: |
          awk-x86_64-unknown-linux-gnu.tar.zst
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

    - name: Run GNU awk testsuite
      shell: bash
      run: |
        cd 'awk'
        export GNU_AWK_DIR="../gnu.awk"
        ./util/run-gnu-testsuite.sh --json-output "${{ env.TEST_FULL_SUMMARY_FILE }}" || true

    - name: Upload full json results
      uses: actions/upload-artifact@v7
      with:
        name: awk-gnu-full-result
        path: awk/${{ env.TEST_FULL_SUMMARY_FILE }}
        if-no-files-found: warn

  aggregate:
    needs: [native]
    permissions:
      actions: read
      contents: read
      pull-requests: read
    name: Aggregate GNU test results
    runs-on: ubuntu-26.04
    steps:
    - name: Initialize workflow variables
      id: vars
      shell: bash
      run: |
        ## VARs setup
        outputs() { step_id="${{ github.action }}"; for var in "$@" ; do echo steps.${step_id}.outputs.${var}="${!var}"; echo "${var}=${!var}" >> $GITHUB_OUTPUT; done; }
        TEST_SUMMARY_FILE='awk-gnu-result.json'
        outputs TEST_SUMMARY_FILE

    - name: Checkout code (awk)
      uses: actions/checkout@v7
      with:
        path: 'awk'
        persist-credentials: false

    - name: Retrieve reference artifacts
      uses: dawidd6/action-download-artifact@v27
      continue-on-error: true
      with:
        workflow: GnuTests.yml
        branch: "${{ env.DEFAULT_BRANCH }}"
        workflow_conclusion: completed
        path: "reference"
        if_no_artifact_found: warn

    - name: Download full json results
      uses: actions/download-artifact@v8
      with:
        name: awk-gnu-full-result
        path: results

    - name: Extract/summarize testing info
      id: summary
      shell: bash
      run: |
        ## Extract/summarize testing info
        outputs() { step_id="${{ github.action }}"; for var in "$@" ; do echo steps.${step_id}.outputs.${var}="${!var}"; echo "${var}=${!var}" >> $GITHUB_OUTPUT; done; }

        RESULT_FILE="results/${{ env.TEST_FULL_SUMMARY_FILE }}"
        if [[ ! -f "$RESULT_FILE" ]]; then
          echo "::error ::Result file $RESULT_FILE not found"
          find results -type f || true
          exit 1
        fi

        TOTAL=$(jq -r '.summary.total // 0' "$RESULT_FILE")
        PASS=$(jq -r '.summary.passed // 0' "$RESULT_FILE")
        FAIL=$(jq -r '.summary.failed // 0' "$RESULT_FILE")
        SKIP=$(jq -r '.summary.skipped // 0' "$RESULT_FILE")
        ERROR=0  # Our format doesn't distinguish errors from failures

        output="GNU awk tests summary = TOTAL: $TOTAL / PASS: $PASS / FAIL: $FAIL / SKIP: $SKIP"
        echo "${output}"
        if [[ "$FAIL" -gt 0 ]]; then
          echo "::warning ::${output}"
        fi

        # Build the date-keyed summary consumed by the awk-tracking repo.
        jq -n \
              --arg date "$(date --rfc-email)" \
              --arg sha "$GITHUB_SHA" \
              --arg total "$TOTAL" \
              --arg pass "$PASS" \
              --arg skip "$SKIP" \
              --arg fail "$FAIL" \
              --arg error "$ERROR" \
              '{($date): { sha: $sha, total: $total, pass: $pass, skip: $skip, fail: $fail, error: $error }}' > '${{ steps.vars.outputs.TEST_SUMMARY_FILE }}'

        HASH=$(sha1sum '${{ steps.vars.outputs.TEST_SUMMARY_FILE }}' | cut --delim=" " -f 1)
        outputs HASH TOTAL PASS FAIL SKIP

    - name: Upload SHA1/ID of 'test-summary'
      uses: actions/upload-artifact@v7
      with:
        name: "${{ steps.summary.outputs.HASH }}"
        path: "${{ steps.vars.outputs.TEST_SUMMARY_FILE }}"

    - name: Upload test results summary
      uses: actions/upload-artifact@v7
      with:
        name: test-summary
        path: "${{ steps.vars.outputs.TEST_SUMMARY_FILE }}"

    - name: Compare test failures VS reference
      shell: bash
      run: |
        ## Compare current results against the reference summary from the default branch
        REF_SUMMARY_FILE='reference/awk-gnu-full-result/${{ env.TEST_FULL_SUMMARY_FILE }}'
        CURRENT_SUMMARY_FILE="results/${{ env.TEST_FULL_SUMMARY_FILE }}"
        IGNORE_INTERMITTENT="awk/.github/workflows/ignore-intermittent.txt"

        # Set up comment directory for the GnuComment workflow.
        COMMENT_DIR="reference/comment"
        mkdir -p ${COMMENT_DIR}
        echo ${{ github.event.number }} > ${COMMENT_DIR}/NR
        COMMENT_LOG="${COMMENT_DIR}/result.txt"
        : > "${COMMENT_LOG}"

        COMPARISON_RESULT=0
        if test -f "${REF_SUMMARY_FILE}"; then
          python3 awk/util/compare_test_results.py \
            --ignore-file "${IGNORE_INTERMITTENT}" \
            --output "${COMMENT_LOG}" \
            "${CURRENT_SUMMARY_FILE}" "${REF_SUMMARY_FILE}" || COMPARISON_RESULT=$?
        else
          echo "::warning ::Skipping test comparison; no prior reference summary at '${REF_SUMMARY_FILE}'."
        fi

        if [ ${COMPARISON_RESULT} -eq 1 ]; then
          echo "::error ::Found new non-intermittent test failures"
          UPLOAD_EXIT=1
        else
          echo "::notice ::No new test failures detected"
          UPLOAD_EXIT=0
        fi
        echo "UPLOAD_EXIT=${UPLOAD_EXIT}" >> $GITHUB_ENV

    - name: Upload comparison log (for GnuComment workflow)
      if: success() || failure()
      uses: actions/upload-artifact@v7
      with:
        name: comment
        path: reference/comment/

    - name: Report test results
      if: success() || failure()
      shell: bash
      run: |
        echo "::notice ::GNU awk testsuite: TOTAL ${{ steps.summary.outputs.TOTAL }} / PASS ${{ steps.summary.outputs.PASS }} / FAIL ${{ steps.summary.outputs.FAIL }} / SKIP ${{ steps.summary.outputs.SKIP }}"
        # Fail the job if the comparison found new non-intermittent regressions.
        exit "${UPLOAD_EXIT:-0}"