spellcheck.yml

name: Spell check 

on:
  pull_request:
    branches:
      - main

jobs:
  typo_check:
    name: Spell check
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write
    env: 
      TYPOS: ""
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          fetch-depth: 2

      - name: Install aspell
        run: sudo apt-get update && sudo apt-get install -y aspell

      - name: Find and check typos in Markdown files
        id: find_typos
        run: |
          echo "Checking for typos..."
          # https://unix.stackexchange.com/a/9500
          IFS=$'\n'
          set -f
          for file in $(find .  -not -name "LICENCE.md" -name "*.md" ); do
            output="$(aspell --lang=en_US --mode=markdown --home-dir=. --personal=.github/wordlist.txt --ignore-case=true --camel-case list <$file)"
            echo "$output"
            # Exit if aspell has errors
            if [ $? -ne 0 ]; then
              exit 1
            fi
            if [[ -n "$output" ]]; then
              # Format output.
              output=$(echo "$output" | sed 's/^/    1. /')
              TYPOS+="- 📄 $file:"
              TYPOS+=$'\n'
              TYPOS+="$output"
              TYPOS+=$'\n'
            fi
          done
          {
            echo 'TYPOS<<EOF'
            echo "$TYPOS"
            echo EOF
          } >> "$GITHUB_ENV"

      - name: Comment on pull request
        if: env.TYPOS != ''
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const author = '${{github.event.pull_request.user.login}}';
            const typos = `${{ env.TYPOS }}`;
            const body = `
            Hi @${author},

            Following typos were found in the pull request:
            
            ${typos}

            ## ℹ️ Here's how to fix them:
            - **Fix typos:** Open the relevant files and fix any identified typos.
            - **Update wordlist:** If a flagged word is actually a project-specific term add it to \`/.github/wordlist.txt\` in the project root.
                Each word should be listed on a separate line. [Learn more.](http://aspell.net/man-html/Format-of-the-Personal-and-Replacement-Dictionaries.html)
            - **🚧 Remember:**
              - When adding new words it MUST NOT have any spaces or special characters within or around it.
              - \`wordlist\` is NOT case sensitive.
              - Use backticks to quote code variables so as to not bloat the \`wordlist\`.
            `;

            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: body
            });

            core.setFailed('🥢 Spell check: Typos found in the PR. Please fix them.');