action.yml

name: 'Nx Affected List'
description: 'Outputs a space-separated list of Nx projects affected by changes between base and head commits.'

inputs:
  base:
    description: 'Base commit SHA'
    required: false
  head:
    description: 'Head commit SHA'
    required: false

outputs:
  affected:
    description: 'Space-separated list of affected project names'
    value: ${{ steps.affected.outputs.affected }}

runs:
  using: 'composite'
  steps:
    - name: Get affected Nx projects
      id: affected
      shell: bash
      env:
        INPUT_BASE: ${{ inputs.base }}
        INPUT_HEAD: ${{ inputs.head }}
      run: |
        set -euo pipefail
        extra_args=()
        if [ -n "${INPUT_BASE:-}" ]; then extra_args+=(--base="$INPUT_BASE"); fi
        if [ -n "${INPUT_HEAD:-}" ]; then extra_args+=(--head="$INPUT_HEAD"); fi

        # Fail the step on nx/git errors so empty output cannot skip integration jobs silently.
        AFFECTED=$(./node_modules/.bin/nx show projects --affected "${extra_args[@]}" | tr '\n' ' ' | xargs)
        echo "affected=$AFFECTED" >> "$GITHUB_OUTPUT"

        if [ -n "$AFFECTED" ]; then
          echo "Affected projects: $AFFECTED"
        else
          echo "No affected projects found"
        fi