todos-handle-issue-changes.yml

name: Update an issues state in a mapping

on:
  # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#onevent_nametypes
  issues:
    # https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#issues
    types:
      - reopened
      - closed

# https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#permissions
permissions:
  contents: write # for "git push"

defaults:
  # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#defaultsrun
  run:
    # Enable fail-fast behavior using set -eo pipefail
    # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#exit-codes-and-error-action-preference
    shell: bash

jobs:
  update-mapping:
    name: Update an issues state
    # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idruns-on
    runs-on: ubuntu-20.04
    steps:
      - name: Clone source code
        uses: actions/checkout@v4.1.0 # https://github.com/actions/checkout
        with:
          # Whether to configure the token or SSH key with the local git config. Default: true
          persist-credentials: true
          # https://github.com/actions/checkout#checkout-a-different-branch
          ref: generated-todos

      - name: Show a payload
        env:
          GITHUB_CONTEXT: ${{ toJson(github) }}
        run: echo "$GITHUB_CONTEXT"

      - name: Update issue state
        env:
          ISSUE_ID: ${{ github.event.issue.number }}
          NEW_STATE: ${{ github.event.action }}
        run: >-
          awk \
            -v issue_id="$ISSUE_ID" \
            -v new_state="$NEW_STATE" \
            'BEGIN { FS="\t"; OFS="\t" } { if ($2 == issue_id && $3 != new_state) { $3=new_state }; print $0 }' \
            todos-on-github.tsv \
            > todos-on-github.tsv.new

      - name: Check for the changes
        run: |
          if ! diff --brief todos-on-github.tsv todos-on-github.tsv.new >/dev/null; then
            echo 'todos-on-github.tsv has been modified'
            mv todos-on-github.tsv.new todos-on-github.tsv
            PUZZLES_MAPPING_MODIFIED=yes
          else
            PUZZLES_MAPPING_MODIFIED=no
          fi

          # Make variable available for the next steps
          echo "PUZZLES_MAPPING_MODIFIED=$PUZZLES_MAPPING_MODIFIED" | tee -a "$GITHUB_ENV"

      - name: Commit updated mapping
        if: env.PUZZLES_MAPPING_MODIFIED == 'yes'
        env:
            GIT_AUTHOR_NAME: 'GitHub Action'
            GIT_COMMITTER_NAME: 'GitHub Action'
            GIT_AUTHOR_EMAIL: 'slava.semushin+ghaction@gmail.com'
            GIT_COMMITTER_EMAIL: 'slava.semushin+ghaction@gmail.com'
        run: |
          git add todos-on-github.tsv
          git commit todos-on-github.tsv -m 'chore: update issues state'
          git push

      - name: Cleanup
        if: always()
        run: |
          [ ! -f todos-on-github.tsv.new ] || rm -fv todos-on-github.tsv.new