action.yml

name: Setup shp
description: Download shp from a shapelang GitHub release and add it to PATH.

inputs:
  version:
    description: Release tag to install. Defaults to the action ref when it is a version tag, otherwise latest.
    required: false
  repository:
    description: Repository to download release assets from.
    required: false
    default: timbrinded/shapelang
  token:
    description: GitHub token used by gh to download release assets.
    required: false

runs:
  using: composite
  steps:
    - name: Download shp
      shell: bash
      env:
        INPUT_VERSION: ${{ inputs.version }}
        ACTION_REF: ${{ github.action_ref }}
        REPOSITORY: ${{ inputs.repository }}
        GH_TOKEN: ${{ inputs.token || github.token }}
      run: |
        set -euo pipefail

        version="$INPUT_VERSION"
        if [ -z "$version" ]; then
          case "$ACTION_REF" in
            v*) version="$ACTION_REF" ;;
            *) version="latest" ;;
          esac
        fi

        case "$RUNNER_OS" in
          Linux)
            os="linux"
            executable="shp"
            ;;
          macOS)
            os="darwin"
            executable="shp"
            ;;
          Windows)
            os="windows"
            executable="shp.exe"
            ;;
          *)
            echo "Unsupported runner OS: $RUNNER_OS" >&2
            exit 1
            ;;
        esac

        case "$RUNNER_ARCH" in
          X64) arch="x64" ;;
          ARM64) arch="arm64" ;;
          *)
            echo "Unsupported runner architecture: $RUNNER_ARCH" >&2
            exit 1
            ;;
        esac

        if [ "$os" = "windows" ] && [ "$arch" = "arm64" ]; then
          echo "No shp release asset is published for Windows ARM64." >&2
          exit 1
        fi
        if [ "$os" = "darwin" ] && [ "$arch" = "x64" ]; then
          echo "No shp release asset is published for macOS x64." >&2
          exit 1
        fi

        asset="shp-$os-$arch.tar.gz"
        download_dir="$(mktemp -d)"
        install_dir="$(mktemp -d)"

        if [ "$version" = "latest" ]; then
          gh release download --repo "$REPOSITORY" --pattern "$asset" --pattern checksums.txt --dir "$download_dir"
        else
          gh release download "$version" --repo "$REPOSITORY" --pattern "$asset" --pattern checksums.txt --dir "$download_dir"
        fi

        if command -v sha256sum >/dev/null 2>&1; then
          (cd "$download_dir" && sha256sum --check checksums.txt --ignore-missing)
        elif command -v shasum >/dev/null 2>&1; then
          expected="$(awk -v asset="$asset" '$2 == "./" asset { print $1 }' "$download_dir/checksums.txt")"
          actual="$(shasum -a 256 "$download_dir/$asset" | awk '{ print $1 }')"
          if [ -z "$expected" ] || [ "$expected" != "$actual" ]; then
            echo "Checksum verification failed for $asset." >&2
            exit 1
          fi
        else
          echo "No SHA-256 tool found; skipping checksum verification." >&2
        fi

        tar -xzf "$download_dir/$asset" -C "$install_dir"
        chmod +x "$install_dir/$executable" 2>/dev/null || true
        path_to_add="$install_dir"
        if [ "$RUNNER_OS" = "Windows" ] && command -v cygpath >/dev/null 2>&1; then
          path_to_add="$(cygpath -w "$install_dir")"
        fi

        echo "$path_to_add" >> "$GITHUB_PATH"
        "$install_dir/$executable" --help >/dev/null