command_dispatch.yml

on:
  issue_comment: # applies to PR and issue comments
    types: [created, edited]

name: Slash command dispatch

jobs:
  preprocessing:
    name: Check for slash command
    runs-on: ubuntu-latest
    permissions:
      # keep this limited to read permissions for the content only!
      contents: read

    outputs:
      react: ${{ steps.parse.outputs.react }}
      command_type: ${{ steps.parse.outputs.command_type }}

    steps:
      - uses: actions/checkout@v4
      - id: parse
        run: |
          if [ "${COMMENT_BODY:0:1}" == "/" ]; then
            echo "react=true" >> $GITHUB_OUTPUT
            json_config=`cat .github/workflows/config/command_dispatch_config.json | sed 's/{{.*}}//g'`
            entries=`echo "$json_config" | jq -c '.[]'`
            for entry in $entries; do
              command_name=`echo $entry | jq -r '.command'`
              if [ "${COMMENT_BODY#/$command_name}" != "$COMMENT_BODY" ]; then
                command_suffix=`echo $entry | jq -r '.event_type_suffix'`
                echo "command_type=${command_name}${command_suffix:--command}" >> $GITHUB_OUTPUT
              fi
            done
          fi
        env:
          COMMENT_BODY: ${{ github.event.comment.body }}

  command_dispatch:
    name: Dispatch slash commands
    needs: preprocessing
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Update configuration
        id: config
        run: |
          pr_url=$(printf '%s\n' "${{ github.event.issue.pull_request.url }}" | sed -e 's/[\/&]/\\&/g')
          github_repo=$(printf '%s\n' "${{ github.repository }}" | sed -e 's/[\/&]/\\&/g')
          cat .github/workflows/config/command_dispatch_config.json \
            | sed "s/.{{[ ]*github.event.issue.pull_request.url[ ]*}}/$pr_url/g" \
            | sed "s/.{{[ ]*github.event.comment.id[ ]*}}/${{ github.event.comment.id }}/g" \
            | sed "s/.{{[ ]*github.repository[ ]*}}/$github_repo/g" > /tmp/command_dispatch_config.json

      - name: React to comment
        if: needs.preprocessing.outputs.react == 'true'
        uses: peter-evans/create-or-update-comment@v3
        with:
          comment-id: ${{ github.event.comment.id }}
          body: |
            > ${{ github.event.comment.body }}
  
            **Command Bot:** Processing...
          edit-mode: replace
          reactions: eyes

      - name: Dispatch
        id: dispatch
        uses: peter-evans/slash-command-dispatch@v3
        with:
          token: ${{ github.token }}
          config-from-file: /tmp/command_dispatch_config.json
        continue-on-error: true

      - name: Edit comment with error message
        if: steps.dispatch.outputs.error-message
        uses: peter-evans/create-or-update-comment@v3
        with:
          comment-id: ${{ github.event.comment.id }}
          body: |
            > ${{ github.event.comment.body }}
  
            **Command Bot:** Could not process command.
            ${{ steps.dispatch.outputs.error-message }}
          # We replace the original comment to avoid an infinite loop
          edit-mode: replace
          reactions-edit-mode: replace
          reactions: |

      - name: Indicate dispatch failure
        if: ${{ needs.preprocessing.outputs.react == 'true' && steps.dispatch.outcome == 'failure' && ! steps.dispatch.outputs.error-message }}
        uses: peter-evans/create-or-update-comment@v3
        with:
          comment-id: ${{ github.event.comment.id }}
          body: |
            > ${{ github.event.comment.body }}
  
            **Command Bot:** Failed to dispatch command. For more information about available commands, use the command /help.
          # We replace the original comment to avoid an infinite loop
          edit-mode: replace
          reactions-edit-mode: replace
          reactions: |

      - name: Indicate successful dispatch
        if: ${{ needs.preprocessing.outputs.command_type != '' && steps.dispatch.outcome == 'success' && ! steps.dispatch.outputs.error-message }}
        uses: peter-evans/create-or-update-comment@v3
        with:
          comment-id: ${{ github.event.comment.id }}
          body: |
            The launched workflow can be found [here](https://github.com/${{ github.event.repository.full_name }}/actions/workflows/${{ needs.preprocessing.outputs.command_type }}.yml).
          edit-mode: append