markdown-linter.yml

# Copyright VMware, Inc.
# SPDX-License-Identifier: APACHE-2.0

name: '[CI/CD] Markdown linter'
on:
  pull_request:
    branches:
      - main
    paths:
      - '**.md'
# Remove all permissions by default
permissions: {}
jobs:
  markdown-linter:
    runs-on: ubuntu-latest
    permissions:
      contents: read
    steps:
      - name: Install mardownlint
        run: npm install -g markdownlint-cli@0.33.0
      - name: Checkout project
        uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633
      - name: Execute markdownlint
        env:
          DIFF_URL: "${{github.event.pull_request.diff_url}}"
          TEMP_FILE: "${{runner.temp}}/pr-${{github.event.number}}.diff"
          TEMP_OUTPUT: "${{runner.temp}}/output"
        run: |
          # This request doesn't consume API calls.
          curl -Lkso $TEMP_FILE $DIFF_URL
          files_changed="$(sed -nr 's/[\-\+]{3} [ab]\/(.*)/\1/p' $TEMP_FILE | sort | uniq)"
          md_files="$(echo "$files_changed" | grep -o ".*\.md$" | sort | uniq || true)"
          # Create an empty file, useful when the PR changes ignored files
          touch "${TEMP_OUTPUT}"
          exit_code=0
          for f in ${md_files}; do
            # Looking for links that do not start with https, # or img
            if grep --quiet --perl-regexp '\]\((?!(http|#|img))[^\)]*' $f; then
              echo "::error:: Please ensure all links in $f starts with http(s), # or img"
              exit 1
            fi
          done
          markdownlint -o "${TEMP_OUTPUT}" ${md_files[@]} || exit_code=$?
          while read -r line; do
            # line format:
            #   file:row[:column] message
            # white space inside brackets is intentional to detect the message for the notice.
            message="${line#*[ ]}"
            file_row_column="${line%%[ ]*}"
            # Split by ':'
            readarray -d : -t strarr < <(printf '%s' "$file_row_column")
            if [[ "${#strarr[@]}" -eq 3 ]]; then
              echo "::warning file=${strarr[0]},line=${strarr[1]},col=${strarr[2]}::${message}"
            elif [[ "${#strarr[@]}" -eq 2 ]]; then
              echo "::warning file=${strarr[0]},line=${strarr[1]}::${message}"
            else
              echo "::warning:: Error processing: ${line}"
            fi
          done < "${TEMP_OUTPUT}"
          if [[ $exit_code -ne 0 ]]; then
            echo "::error:: Please review linter messages"
            exit "$exit_code"
          fi