Fix an issue where the type <formatter> list command would not accept a valid argument and instead error out complaining about a malformed regex

rdar://problem/24380025

llvm-svn: 259078

lldb/packages/Python/lldbsuite/test/functionalities/data-formatter/type_summary_list_arg/TestTypeSummaryListArg.py

@@ -0,0 +1,26 @@
+"""
+Test lldb data formatter subsystem.
+"""
+
+from __future__ import print_function
+
+
+
+import os, time
+import lldb
+from lldbsuite.test.lldbtest import *
+import lldbsuite.test.lldbutil as lldbutil
+
+class TypeSummaryListArgumentTestCase(TestBase):
+
+    mydir = TestBase.compute_mydir(__file__)
+
+    def setUp(self):
+        # Call super's setUp().
+        TestBase.setUp(self)
+
+    @no_debug_info_test
+    def test_type_summary_list_with_arg(self):
+        """Test that the 'type summary list' command handles command line arguments properly"""
+        self.expect('type summary list Foo', substrs=['Category: default', 'Category: system'])
+        self.expect('type summary list char', substrs=['char *', 'unsigned char'])

lldb/source/Commands/CommandObjectType.cpp

@@ -1384,7 +1384,7 @@ protected:
         
         if (argc == 1)
         {
-            const char* arg = command.GetArgumentAtIndex(1);
+            const char* arg = command.GetArgumentAtIndex(0);
             formatter_regex.reset(new RegularExpression());
             if (!formatter_regex->Compile(arg))
             {