check-changes.yml

name: Check File Changes

on:
  workflow_call:
    inputs:
      skip-extensions:
        description: Space-separated list of file extensions that should skip tests
        required: false
        type: string
        default: md mdc txt rst png jpg jpeg gif svg ico pdf
    outputs:
      should-skip:
        description: Whether the workflow should skip (only skippable files changed)
        value: ${{ jobs.check-changes.outputs.should-skip }}

permissions:
  contents: read

jobs:
  check-changes:
    runs-on: ubuntu-latest
    outputs:
      should-skip: ${{ steps.check.outputs.should-skip }}
    steps:
      - uses: actions/checkout@v5
        with:
          fetch-depth: 0

      - name: Check if only skippable files changed
        id: check
        run: |
          # Use input parameter or default
          SKIP_EXTENSIONS="${{ inputs.skip-extensions }}"

          if [ "${{ github.event_name }}" == "schedule" ] || [ "${{ github.event_name }}" == "workflow_dispatch" ]; then
            echo "Triggered by schedule or manual dispatch, running full tests"
            echo "should-skip=false" >> $GITHUB_OUTPUT
            exit 0
          fi

          # Get the list of changed files
          git fetch origin ${{ github.base_ref }}
          CHANGED_FILES=$(git diff --name-only origin/${{ github.base_ref }}...HEAD)

          # Check if we have any changes
          if [ -z "$CHANGED_FILES" ]; then
            echo "No files changed, running tests"
            echo "should-skip=false" >> $GITHUB_OUTPUT
            exit 0
          fi

          # Build regex pattern from extensions (e.g., \.(md|txt|png)$)
          PATTERN=$(echo "$SKIP_EXTENSIONS" | sed 's/ /|/g')
          REGEX="\.($PATTERN)$"

          # Check if all changes match skippable extensions
          NON_SKIPPABLE_FILES=$(echo "$CHANGED_FILES" | grep -Ev "$REGEX" || true)

          if [ -z "$NON_SKIPPABLE_FILES" ]; then
            echo "Only skippable files changed (extensions: $SKIP_EXTENSIONS), skipping tests"
            echo "should-skip=true" >> $GITHUB_OUTPUT
          else
            echo "Non-skippable files changed, running tests"
            echo "should-skip=false" >> $GITHUB_OUTPUT
          fi

  skip-job:
    needs: check-changes
    if: needs.check-changes.outputs.should-skip == 'true'
    runs-on: ubuntu-latest
    steps:
      - name: Skip tests
        run: echo "Only documentation/assets changed, skipping tests"