action.yml

name: 'Should I notify slack?'
description: 'Decide if a notification to slack is necessary taking into account the previous build result.'
branding:
  icon: 'bell'
  color: 'green'
inputs:
  needs_context:
    description: 'json representation of the `needs` object in your context (`toJson(needs)`)'
    required: true
  branch:
    description: 'The branch to get the status from'
    required: true
    default: 'main'
  github_token:
    description: 'A github token (secrets.GITHUB_TOKEN will suffice)'
    required: true
outputs:
  should_send_message:
    description: "`yes|no` depending on if the message should be sent"
    value: ${{ steps.determine-notification.outputs.should_send_message }}
runs:
  using: "composite"
  steps:
    - name: Determine if we need to notify
      id: determine-notification
      shell: bash
      run: |
        workflow_id=$(curl --header 'authorization: Bearer ${{ inputs.github_token }}' \
            --header 'content-type: application/json' \
            https://api.github.com/repos/${{ github.repository }}/actions/runs/${{ github.run_id }} | jq -r .workflow_id)
        echo "workflow id: $workflow_id"
        last_status=$(curl --silent --header 'authorization: Bearer ${{ inputs.github_token }}' \
                      --header 'content-type: application/json' \
                      "https://api.github.com/repos/${{ github.repository }}/actions/workflows/$workflow_id/runs?per_page=1&status=completed&branch=${{ inputs.branch }}" | jq -r .workflow_runs[0].conclusion)
        echo "status of the previous build: $last_status"
        needs_context="${{ inputs.needs_context }}"

        if [[ $(echo $needs_context | grep "result: failure") ]]; then
          echo "One of the jobs in the "needs" array failed"
          echo "should_send_message=yes" >> $GITHUB_OUTPUT
        elif [[ $last_status == failure ]]; then
          echo "The last run for this workflow failed so this is a recovery"
          echo "should_send_message=yes" >> $GITHUB_OUTPUT
        else
          echo "The last run did not fail and none of the jobs in needs failed either"
          echo "should_send_message=no" >> $GITHUB_OUTPUT
        fi