// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/// Operations relative to the user's installed Dart SDK.
library pub.sdk;

import 'dart:io';

import 'package:path/path.dart' as path;

import 'io.dart';
import 'version.dart';

/// Gets the path to the root directory of the SDK.
///
/// When running from the actual built SDK, this will be the SDK that contains
/// the running Dart executable. When running from the repo, it will be the
/// "sdk" directory in the Dart repository itself.
final String rootDirectory =
    runningFromSdk ? _rootDirectory : path.join(repoRoot, "sdk");

/// Gets the path to the root directory of the SDK, assuming that the currently
/// running Dart executable is within it.
final String _rootDirectory =
    path.dirname(path.dirname(Platform.executable));

/// The SDK's revision number formatted to be a semantic version.
///
/// This can be set so that the version solver tests can artificially select
/// different SDK versions.
Version version = _getVersion();

/// Determine the SDK's version number.
Version _getVersion() {
  // Some of the pub integration tests require an SDK version number, but the
  // tests on the bots are not run from a built SDK so this lets us avoid
  // parsing the missing version file.
  var sdkVersion = Platform.environment["_PUB_TEST_SDK_VERSION"];
  if (sdkVersion != null) return new Version.parse(sdkVersion);

  // Read the "version" file.
  var revisionPath = path.join(_rootDirectory, "version");
  var version = readTextFile(revisionPath).trim();
  return new Version.parse(version);
}