Revert 214254 "Add initial prototype for the GN meta-buildsystem."

trunk/src/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 "tools/gn/commands.h"
-#include "tools/gn/err.h"
-#include "tools/gn/location.h"
-
-namespace {
-
-std::vector<std::string> GetArgs(const CommandLine& cmdline) {
-  CommandLine::StringVector in_args = cmdline.GetArgs();
-#if defined(OS_WIN)
-  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]));
-  return out_args;
-#else
-  return in_args;
-#endif
-}
-
-}  // namespace
-
-int main(int argc, char** argv) {
-  base::AtExitManager at_exit;
-  CommandLine::Init(argc, argv);
-
-  std::vector<std::string> args = GetArgs(*CommandLine::ForCurrentProcess());
-
-  std::string command;
-  if (args.empty()) {
-    command = "gen";
-  } else {
-    command = args[0];
-    args.erase(args.begin());
-  }
-
-  int retval = 0;
-  if (command == "gen") {
-    retval = RunGenCommand(args);
-  } else if (command == "desc" || command == "wtf") {
-    retval = RunDescCommand(args);
-  } else if (command == "deps") {
-    retval = RunDepsCommand(args);
-  } else if (command == "tree") {
-    retval = RunTreeCommand(args);
-  } else {
-    Err(Location(),
-        "Command \"" + command + "\" unknown.").PrintToStdout();
-    retval = 1;
-  }
-
-  exit(retval);  // Don't free memory, it can be really slow!
-  return retval;
-}