action.yml

name: "Deploy static site to Netlify or Vercel"
description: "Deploy to Netlify or Vercel when commit id changes"
author: "Łukasz Wójcik"

branding:
  color: "gray-dark"
  icon: "play"

inputs:
  platform:
    description: "Name of the platform to deploy to (netlify / vercel - all lowercase)"
    required: true
  netlify_deploy_hook_url:
    description: "Netlify deploy hook URL used to trigger the build"
  always_deploy:
    description: "Skip cache check and always deploy even if no changes are detected"
    default: "false"
  vercel_deploy_hook_url:
    description: "Vercel deploy hook URL used to trigger the build"
  cache_file_path:
    description: "Name of the file to use for caching deployed commit id"
    default: "commit_id.txt"
  cache_key_prefix:
    description: "Cache key prefix"
    default: "commit_id"

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

    - name: Read latest commit id
      shell: bash
      id: read_latest_commit
      run: |
        COMMIT_ID=$(git rev-parse HEAD)

        echo "Latest commit id: ${COMMIT_ID}"
        echo "commit_id=$COMMIT_ID" >> $GITHUB_OUTPUT

    - name: Restore cached commit id
      id: restore_cached_commit
      uses: actions/cache/restore@v4
      with:
        path: "${{ inputs.cache_file_path }}"
        key: ${{ inputs.cache_key_prefix }}-${{ steps.read_latest_commit.outputs.commit_id }}
        restore-keys: ${{ inputs.cache_key_prefix }}-

    - name: Read cached commit id
      shell: bash
      id: check_cache
      run: |
        echo "Cached commit id: $(cat "${{ inputs.cache_file_path }}" || echo '')"
        echo "commit_id=$(cat "${{ inputs.cache_file_path }}" || echo '')" >> $GITHUB_OUTPUT

    - name: Compare commit ids
      shell: bash
      id: compare_commits
      run: |
        if [ "${{ inputs.always_deploy }}" == "true" ]; then
          echo "always_deploy was set to true. Deployment will start shortly..."
          echo "should_deploy=true" >> $GITHUB_OUTPUT
        elif [ "${{ steps.check_cache.outputs.commit_id }}" == "${{ steps.read_latest_commit.outputs.commit_id }}" ]; then
          echo "Commit ids match. Skipping deployment."
          echo "should_deploy=false" >> $GITHUB_OUTPUT
        else
          echo "Commit ids differ. Deployment will start shortly..."
          echo "should_deploy=true" >> $GITHUB_OUTPUT
        fi

    - name: Deploy site
      shell: bash
      if: steps.compare_commits.outputs.should_deploy == 'true'
      run: |
        PLATFORM="${{ inputs.platform }}"
        NETLIFY_DEPLOY_HOOK_URL="${{ inputs.netlify_deploy_hook_url }}"
        VERCEL_DEPLOY_HOOK_URL="${{ inputs.vercel_deploy_hook_url }}"

        if [ "$PLATFORM" = "netlify" ]; then
          echo "Deploying to Netlify"
          curl -X POST -d {} "$NETLIFY_DEPLOY_HOOK_URL"
        elif [ "$PLATFORM" = "vercel" ]; then
          echo "Deploying to Vercel"
          curl -X POST -d {} "$VERCEL_DEPLOY_HOOK_URL"
        else
          echo "Invalid site type provided. Deployment aborted."
          exit 1
        fi

    - name: Update latest commit id
      shell: bash
      if: steps.compare_commits.outputs.should_deploy == 'true' && inputs.always_deploy != 'true'
      run: echo "${{ steps.read_latest_commit.outputs.commit_id }}" > "${{ inputs.cache_file_path }}"

    - name: Save new commit id to cache
      if: steps.compare_commits.outputs.should_deploy == 'true' && inputs.always_deploy != 'true'
      uses: actions/cache/save@v4
      with:
        path: ${{ inputs.cache_file_path }}
        key: ${{ inputs.cache_key_prefix }}-${{ steps.read_latest_commit.outputs.commit_id }}