[fuchsia_reload] Fix command line argument checking (#9434)

b645e4ea · Zachary Anderson · GitHub · fc58bd76 · b645e4ea
Commit b645e4ea authored Apr 17, 2017 by Zachary Anderson Committed by GitHub Apr 17, 2017
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fuchsia_reload.dart packages/flutter_tools/lib/src/commands/fuchsia_reload.dart +6 -3

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--- a/packages/flutter_tools/lib/src/commands/fuchsia_reload.dart
+++ b/packages/flutter_tools/lib/src/commands/fuchsia_reload.dart
@@ -195,9 +195,12 @@ class FuchsiaReloadCommand extends FlutterCommand {
      return;
    }
-    final List<String> gnTarget = _extractPathAndName(argResults['gn-target']);
+    final String gnTarget = argResults['gn-target'];
-    _projectRoot = gnTarget[0];
+    if (gnTarget == null)
-    _projectName = gnTarget[1];
+      throwToolExit('Give the GN target with --gn-target(-g).');
+    final List<String> targetInfo = _extractPathAndName(gnTarget);
+    _projectRoot = targetInfo[0];
+    _projectName = targetInfo[1];
    _fuchsiaProjectPath = '$_fuchsiaRoot/$_projectRoot';
    if (!_directoryExists(_fuchsiaProjectPath))
      throwToolExit('Target does not exist in the Fuchsia tree: $_fuchsiaProjectPath.');