[GN] Add support for generating Xcode projects.

tools/gn/command_gen.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/atomicops.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/timer/elapsed_timer.h"
 #include "tools/gn/build_settings.h"
 #include "tools/gn/commands.h"
 #include "tools/gn/eclipse_writer.h"
 #include "tools/gn/ninja_target_writer.h"
 #include "tools/gn/ninja_writer.h"
 #include "tools/gn/runtime_deps.h"
 #include "tools/gn/scheduler.h"
 #include "tools/gn/setup.h"
 #include "tools/gn/standard_out.h"
 #include "tools/gn/switches.h"
 #include "tools/gn/target.h"
 #include "tools/gn/visual_studio_writer.h"
+#include "tools/gn/xcode_writer.h"
 
 namespace commands {
 
 namespace {
 
 const char kSwitchCheck[] = "check";
 const char kSwitchFilters[] = "filters";
 const char kSwitchIde[] = "ide";
 const char kSwitchIdeValueEclipse[] = "eclipse";
 const char kSwitchIdeValueVs[] = "vs";
 const char kSwitchIdeValueVs2013[] = "vs2013";
 const char kSwitchIdeValueVs2015[] = "vs2015";
+const char kSwitchIdeValueXcode[] = "xcode";
+const char kSwitchNinjaExtraArgs[] = "ninja-extra-args";
+const char kSwitchRootTarget[] = "root-target";
 const char kSwitchSln[] = "sln";
+const char kSwitchWorkspace[] = "workspace";
 
 // Called on worker thread to write the ninja file.
 void BackgroundDoWrite(const Target* target) {
   NinjaTargetWriter::RunAndWriteFile(target);
   g_scheduler->DecrementWorkCount();
 }
 
 // Called on the main thread.
 void ItemResolvedCallback(base::subtle::Atomic32* write_counter,
                           scoped_refptr<Builder> builder,
@@ skipping 135 matching lines @@
     if (command_line->HasSwitch(kSwitchFilters))
       filters = command_line->GetSwitchValueASCII(kSwitchFilters);
     bool res = VisualStudioWriter::RunAndWriteFiles(
         build_settings, builder, version, sln_name, filters, err);
     if (res && !command_line->HasSwitch(switches::kQuiet)) {
       OutputString("Generating Visual Studio projects took " +
                    base::Int64ToString(timer.Elapsed().InMilliseconds()) +
                    "ms\n");
     }
     return res;
+  } else if (ide == kSwitchIdeValueXcode) {
+    bool res = XcodeWriter::RunAndWriteFiles(
+        command_line->GetSwitchValueASCII(kSwitchWorkspace),
+        command_line->GetSwitchValueASCII(kSwitchRootTarget),
+        command_line->GetSwitchValueASCII(kSwitchNinjaExtraArgs),
+        command_line->GetSwitchValueASCII(kSwitchFilters), build_settings,
+        builder, err);
+    if (res && !command_line->HasSwitch(switches::kQuiet)) {
+      OutputString("Generating Xcode projects took " +
+                   base::Int64ToString(timer.Elapsed().InMilliseconds()) +
+                   "ms\n");
+    }
+    return res;
   }
 
   *err = Err(Location(), "Unknown IDE: " + ide);
   return false;
 }
 
 }  // namespace
 
 const char kGen[] = "gen";
 const char kGen_HelpShort[] =
@@ skipping 17 matching lines @@
     "\n"
     "  GN optionally generates files for IDE. Possibilities for <ide options>\n"
     "\n"
     "  --ide=<ide_name>\n"
     "      Generate files for an IDE. Currently supported values:\n"
     "      \"eclipse\" - Eclipse CDT settings file.\n"
     "      \"vs\" - Visual Studio project/solution files.\n"
     "             (default Visual Studio version: 2015)\n"
     "      \"vs2013\" - Visual Studio 2013 project/solution files.\n"
     "      \"vs2015\" - Visual Studio 2015 project/solution files.\n"
-    "\n"
-    "  --sln=<file_name>\n"
-    "      Override default sln file name (\"all\"). Solution file is written\n"
-    "      to the root build directory. Only for Visual Studio.\n"
+    "      \"xcode\" - Xcode workspace/solution files.\n"
     "\n"
     "  --filters=<path_prefixes>\n"
     "      Semicolon-separated list of label patterns used to limit the set\n"
     "      of generated projects (see \"gn help label_pattern\"). Only\n"
-    "      matching targets will be included to the solution. Only for Visual\n"
-    "      Studio.\n"
+    "      matching targets will be included to the solution. Only used for\n"
+    "      Visual Studio and Xcode.\n"
+    "\n"
+    "Visual Studio Flags\n"
+    "\n"
+    "  --sln=<file_name>\n"
+    "      Override default sln file name (\"all\"). Solution file is written\n"
+    "      to the root build directory.\n"
+    "\n"
+    "Xcode Flags\n"
+    "\n"
+    "  --workspace=<file_name>\n"
+    "      Override defaut workspace file name (\"all\"). The workspace file\n"
+    "      is written to the root build directory.\n"
+    "\n"
+    "  --ninja-extra-args=<string>\n"
+    "      This string is passed without any quoting to the ninja invocation\n"
+    "      command-line. Can be used to configure ninja flags, like \"-j\" if\n"
+    "      using goma for example.\n"
+    "\n"
+    "  --root-target=<target_name>\n"
+    "      Name of the target corresponding to \"All\" target in Xcode. If\n"
+    "      unset, \"All\" invokes ninja without any target thus build all the\n"
+    "      targets.\n"
     "\n"
     "Eclipse IDE Support\n"
     "\n"
     "  GN DOES NOT generate Eclipse CDT projects. Instead, it generates a\n"
     "  settings file which can be imported into an Eclipse CDT project. The\n"
     "  XML file contains a list of include paths and defines. Because GN does\n"
     "  not generate a full .cproject definition, it is not possible to\n"
     "  properly define includes/defines for each file individually.\n"
     "  Instead, one set of includes/defines is generated for the entire\n"
     "  project. This works fairly well but may still result in a few indexer\n"
@@ skipping 66 matching lines @@
             setup->scheduler().input_file_manager()->GetInputFileCount()) +
         " files in " +
         base::Int64ToString(elapsed_time.InMilliseconds()) + "ms\n";
     OutputString(stats);
   }
 
   return 0;
 }
 
 }  // namespace commands