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      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 "tools/gn/commands.h"
      6 #include "tools/gn/item.h"
      7 #include "tools/gn/label.h"
      8 #include "tools/gn/setup.h"
      9 #include "tools/gn/standard_out.h"
     10 #include "tools/gn/target.h"
     11 
     12 namespace commands {
     13 
     14 CommandInfo::CommandInfo()
     15     : help_short(NULL),
     16       help(NULL),
     17       runner(NULL) {
     18 }
     19 
     20 CommandInfo::CommandInfo(const char* in_help_short,
     21                          const char* in_help,
     22                          CommandRunner in_runner)
     23     : help_short(in_help_short),
     24       help(in_help),
     25       runner(in_runner) {
     26 }
     27 
     28 const CommandInfoMap& GetCommands() {
     29   static CommandInfoMap info_map;
     30   if (info_map.empty()) {
     31     #define INSERT_COMMAND(cmd) \
     32         info_map[k##cmd] = CommandInfo(k##cmd##_HelpShort, \
     33                                        k##cmd##_Help, \
     34                                        &Run##cmd);
     35 
     36     INSERT_COMMAND(Args)
     37     INSERT_COMMAND(Desc)
     38     INSERT_COMMAND(Gen)
     39     INSERT_COMMAND(Gyp)
     40     INSERT_COMMAND(Help)
     41     INSERT_COMMAND(Refs)
     42 
     43     #undef INSERT_COMMAND
     44   }
     45   return info_map;
     46 }
     47 
     48 const Target* GetTargetForDesc(const std::vector<std::string>& args) {
     49   // Deliberately leaked to avoid expensive process teardown.
     50   Setup* setup = new Setup;
     51   if (!setup->DoSetup())
     52     return NULL;
     53 
     54   // TODO(brettw): set the output dir to be a sandbox one to avoid polluting
     55   // the real output dir with files written by the build scripts.
     56 
     57   // Do the actual load. This will also write out the target ninja files.
     58   if (!setup->Run())
     59     return NULL;
     60 
     61   // Need to resolve the label after we know the default toolchain.
     62   // TODO(brettw) find the current directory and resolve the input label
     63   // relative to that.
     64   Label default_toolchain = setup->loader()->default_toolchain_label();
     65   Value arg_value(NULL, args[0]);
     66   Err err;
     67   Label label =
     68       Label::Resolve(SourceDir("//"), default_toolchain, arg_value, &err);
     69   if (err.has_error()) {
     70     err.PrintToStdout();
     71     return NULL;
     72   }
     73 
     74   const Item* item = setup->builder()->GetItem(label);
     75   if (!item) {
     76     Err(Location(), "Label not found.",
     77         label.GetUserVisibleName(false) + " not found.").PrintToStdout();
     78     return NULL;
     79   }
     80 
     81   const Target* target = item->AsTarget();
     82   if (!target) {
     83     Err(Location(), "Not a target.",
     84         "The \"" + label.GetUserVisibleName(false) + "\" thing\n"
     85         "is not a target. Somebody should probably implement this command for "
     86         "other\nitem types.");
     87     return NULL;
     88   }
     89 
     90   return target;
     91 }
     92 
     93 }  // namespace commands
     94