action.yaml

name: Slack Templates
author: Kurt von Laven
description: Send Informative, Concise Slack Notifications With Minimal Effort
inputs:
  bot-token:
    description: >
      The Slack API bot token for your custom app with chat:write scope.
    required: true
  channel-id:
    description: >
      The ID of a Slack channel to send notifications to. Your bot should be a
      member. Secondary-click on the channel in Slack, and select "Copy link" to
      copy a URL containing the channel ID.
    required: true
  template:
    description: >
      The type of Slack notification to send: "assignee," "custom," "reviewers,"
      or "result." Defaults to "custom." Must pass message if using "custom."
    required: false
    default: custom
  results:
    description: >
      The job results to report via Slack when using the "result" template.
      Defaults to the status of the current job. To report the result of an
      entire workflow, use this action from a final notify job that depends on
      (a.k.a., "needs") all other jobs. Then, pass join(needs.*.result, ' ').
      The highest ranking result will be reported: 1. failure, 2. cancelled,
      3. success, 4. skipped. Alternatively, a custom result may be passed
      provided that it is quoted for use as a Bash command line argument.
    required: false
    default: ${{ job.status }}
  message:
    description: A custom Slack message to send. Do not also pass a template.
    required: false
    default: Pass message or template to slack-templates.
branding:
  icon: hash
  color: gray-dark
runs:
  using: composite
  steps:
    - id: python
      name: Read asdf Python version from .tool-versions.
      run: |
        python_version="$(grep --perl-regexp --only-matching '(?<=python )(\d+\.){2}\d+' .tool-versions)"
        echo "VERSION=$python_version" >>"$GITHUB_OUTPUT"
      shell: bash
      working-directory: "${{ github.action_path }}"
    - name: Set up Python based on asdf Python version.
      uses: actions/setup-python@v4.7.0
      with:
        python-version: "${{ steps.python.outputs.VERSION }}"
    - name: Configure Slack notification.
      run: >
        python set_slack_message.py
        '${{ inputs.template }}'
        '${{ inputs.results }}'
        '${{ inputs.message }}'
        '${{ github.token }}'
        '${{ github.event.pull_request.user.login }}'
        '*${{ join(github.event.pull_request.requested_reviewers.*.login, '*, *') }}*'
        '${{ github.event.pull_request.assignee.login }}'
        '${{ github.event.pull_request.number }}'
      shell: bash
      working-directory: "${{ github.action_path }}"
    - name: Send Slack notification.
      if: inputs.bot-token != '' && inputs.channel-id != ''
      uses: slackapi/slack-github-action@v1.24.0
      with:
        channel-id: ${{ inputs.channel-id }}
        slack-message: ${{ env.SLACK_MESSAGE }}
      env:
        SLACK_BOT_TOKEN: ${{ inputs.bot-token }}