Allow typing label names on Windows by not treating things that start with slashes as arguments rat…

tools/gn/gn_main.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/strings/utf_string_conversions.h"
+#include "build/build_config.h"
 #include "tools/gn/commands.h"
 #include "tools/gn/err.h"
 #include "tools/gn/location.h"
 
+#if defined(OS_WIN)
+#include <windows.h>
+#include <shellapi.h>
+#endif
+
 namespace {
 
 std::vector<std::string> GetArgs(const CommandLine& cmdline) {
-  CommandLine::StringVector in_args = cmdline.GetArgs();
 #if defined(OS_WIN)
+  // On Windows our command line parser treats things starting with slashes as
+  // switches. This makes it impossible to type label names like "//foo:bar".

[scottmg, 2013/09/25 17:23:23]

seems like it'd be a useful option for CommandLine

+  //
+  // Here, we manually extract the args, looking only for ones beginning with
+  // hyphens to behave more like Posix.
+  int num_args = 0;
+  wchar_t** args = NULL;
+  args = ::CommandLineToArgvW(::GetCommandLineW(), &num_args);
+
+  bool found_switch_terminator = false;
   std::vector<std::string> out_args;
-  for (size_t i = 0; i < in_args.size(); i++)
-    out_args.push_back(base::WideToUTF8(in_args[i]));
+  for (int i = 1; i < num_args; i++) {
+    if (args[i][0] == '-' && args[i][1] == '-' && args[i][2] == 0) {
+      // Found a bare "--" argument, treat everything following as args.
+      found_switch_terminator = true;
+      continue;
+    }
+    if (found_switch_terminator || args[i][0] != '-')
+      out_args.push_back(base::WideToUTF8(args[i]));
+  }
+
+  ::LocalFree(args);
   return out_args;
+
 #else
-  return in_args;
+  return cmdline.GetArgs();
 #endif
 }
 
 }  // namespace
 
 int main(int argc, char** argv) {
   base::AtExitManager at_exit;
   CommandLine::Init(argc, argv);
 
   const CommandLine& cmdline = *CommandLine::ForCurrentProcess();
@@ skipping 20 matching lines @@
   } else {
     Err(Location(),
         "Command \"" + command + "\" unknown.").PrintToStdout();
     commands::RunHelp(std::vector<std::string>());
     retval = 1;
   }
 
   exit(retval);  // Don't free memory, it can be really slow!
   return retval;
 }