tools/gn/gn_main.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/at_exit.h"
   6 #include "base/command_line.h"
   7 #include "base/strings/utf_string_conversions.h"
   8 #include "tools/gn/commands.h"
   9 #include "tools/gn/err.h"
  10 #include "tools/gn/location.h"
  11 #include "tools/gn/standard_out.h"
  12
  13 // Only the GN-generated build makes this header for now.
  14 // TODO(brettw) consider adding this if we need it in GYP.
  15 #if defined(GN_BUILD)
  16 #include "tools/gn/last_commit_position.h"
  17 #else
  18 #define LAST_COMMIT_POSITION "UNKNOWN"
  19 #endif
  20
  21 namespace {
  22
  23 std::vector<std::string> GetArgs(const CommandLine& cmdline) {
  24   CommandLine::StringVector in_args = cmdline.GetArgs();
  25 #if defined(OS_WIN)
  26   std::vector<std::string> out_args;
  27   for (const auto& arg : in_args)
  28     out_args.push_back(base::WideToUTF8(arg));
  29   return out_args;
  30 #else
  31   return in_args;
  32 #endif
  33 }
  34
  35 }  // namespace
  36
  37 int main(int argc, char** argv) {
  38   base::AtExitManager at_exit;
  39 #if defined(OS_WIN)
  40   CommandLine::set_slash_is_not_a_switch();
  41 #endif
  42   CommandLine::Init(argc, argv);
  43
  44   const CommandLine& cmdline = *CommandLine::ForCurrentProcess();
  45   std::vector<std::string> args = GetArgs(cmdline);
  46
  47   std::string command;
  48   if (cmdline.HasSwitch("help") || cmdline.HasSwitch("h")) {
  49     // Make "-h" and "--help" default to help command.
  50     command = commands::kHelp;
  51   } else if (cmdline.HasSwitch("version")) {
  52     // Make "--version" print the version and exit.
  53     OutputString(std::string(LAST_COMMIT_POSITION) + "\n");
  54     exit(0);
  55   } else if (args.empty()) {
  56     // No command, print error and exit.
  57     Err(Location(), "No command specified.",
  58         "Most commonly you want \"gn gen <out_dir>\" to make a build dir.\n"
  59         "Or try \"gn help\" for more commands.").PrintToStdout();
  60     return 1;
  61   } else {
  62     command = args[0];
  63     args.erase(args.begin());
  64   }
  65
  66   const commands::CommandInfoMap& command_map = commands::GetCommands();
  67   commands::CommandInfoMap::const_iterator found_command =
  68       command_map.find(command);
  69
  70   int retval;
  71   if (found_command != command_map.end()) {
  72     retval = found_command->second.runner(args);
  73   } else {
  74     Err(Location(),
  75         "Command \"" + command + "\" unknown.").PrintToStdout();
  76     commands::RunHelp(std::vector<std::string>());
  77     retval = 1;
  78   }
  79
  80   exit(retval);  // Don't free memory, it can be really slow!
  81 }