Rename fletch -> dartino

pkg/dartino_compiler/lib/src/guess_configuration.dart

+// Copyright (c) 2015, the Dartino 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.md file.
+
+library dartino_compiler.src.guess_configuration;
+
+import 'dart:io' show
+    File,
+    Link,
+    Platform,
+    Process;
+
+const String _DARTINO_VM = const String.fromEnvironment("dartino-vm");
+
+Uri get executable {
+  return Uri.base.resolveUri(new Uri.file(Platform.resolvedExecutable));
+}
+
+bool _looksLikeDartinoVm(Uri uri) {
+  return new File.fromUri(uri).existsSync();
+}
+
+// TODO(zerny): Guessing the VM path should only happen once and only if no
+// prior configuration has happend. Make this a private method in
+// dartino_compiler.dart
+Uri guessDartinoVm(Uri dartinoVm, {bool mustExist: true}) {
+  if (dartinoVm == null && _DARTINO_VM != null) {
+    // Use Uri.base here because _DARTINO_VM is a constant relative to the
+    // location of where the Dart VM was started, not relative to the C++
+    // client.
+    dartinoVm = Uri.base.resolve(_DARTINO_VM);
+  } else {
+    Uri uri = executable.resolve('dartino-vm');
+    if (new File.fromUri(uri).existsSync()) {
+      dartinoVm = uri;
+    }
+  }
+  if (dartinoVm == null) {
+    if (!mustExist) return null;
+    throw new StateError("""
+Unable to guess the location of the dartino VM (dartinoVm).
+Try adding command-line option '-Ddartino-vm=<path to dartino VM>.""");
+  } else if (!_looksLikeDartinoVm(dartinoVm)) {
+    if (!mustExist) return null;
+    throw new StateError("""
+No dartino VM at '$dartinoVm'.
+Try adding command-line option '-Ddartino-vm=<path to dartino VM>.""");
+  }
+  return dartinoVm;
+}
+
+String _cachedDartinoVersion;
+
+String get dartinoVersion {
+  if (_cachedDartinoVersion != null) return _cachedDartinoVersion;
+  _cachedDartinoVersion = const String.fromEnvironment('dartino.version');
+  if (_cachedDartinoVersion != null) return _cachedDartinoVersion;
+  Uri dartinoVm = guessDartinoVm(null, mustExist: false);
+  if (dartinoVm != null) {
+    String vmPath = dartinoVm.toFilePath();
+    return _cachedDartinoVersion =
+        Process.runSync(vmPath, <String>["--version"]).stdout.trim();
+  }
+  return _cachedDartinoVersion = "version information not available";
+}