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

trunk/src/tools/gn/command_desc.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 <algorithm>
-#include <set>
-
-#include "tools/gn/commands.h"
-#include "tools/gn/config.h"
-#include "tools/gn/item.h"
-#include "tools/gn/item_node.h"
-#include "tools/gn/label.h"
-#include "tools/gn/setup.h"
-#include "tools/gn/standard_out.h"
-#include "tools/gn/target.h"
-
-namespace {
-
-struct CompareTargetLabel {
-  bool operator()(const Target* a, const Target* b) const {
-    return a->label() < b->label();
-  }
-};
-
-const Target* GetTargetForDesc(const std::vector<std::string>& args) {
-  // Deliberately leaked to avoid expensive process teardown.
-  Setup* setup = new Setup;
-  if (!setup->DoSetup())
-    return NULL;
-
-  // FIXME(brettw): set the output dir to be a sandbox one to avoid polluting
-  // the real output dir with files written by the build scripts.
-
-  // Do the actual load. This will also write out the target ninja files.
-  if (!setup->Run())
-    return NULL;
-
-  // Need to resolve the label after we know the default toolchain.
-  // TODO(brettw) find the current directory and resolve the input label
-  // relative to that.
-  Label default_toolchain = setup->build_settings().toolchain_manager()
-      .GetDefaultToolchainUnlocked();
-  Value arg_value(NULL, args[0]);
-  Err err;
-  Label label = Label::Resolve(SourceDir(), default_toolchain, arg_value, &err);
-  if (err.has_error()) {
-    err.PrintToStdout();
-    return NULL;
-  }
-
-  ItemNode* node;
-  {
-    base::AutoLock lock(setup->build_settings().item_tree().lock());
-    node = setup->build_settings().item_tree().GetExistingNodeLocked(label);
-  }
-  if (!node) {
-    Err(Location(), "",
-        "I don't know about this \"" + label.GetUserVisibleName(false) +
-        "\"").PrintToStdout();
-    return NULL;
-  }
-
-  const Target* target = node->item()->AsTarget();
-  if (!target) {
-    Err(Location(), "Not a target.",
-        "The \"" + label.GetUserVisibleName(false) + "\" thing\n"
-        "is not a target. Somebody should probably implement this command for "
-        "other\nitem types.");
-    return NULL;
-  }
-
-  return target;
-}
-
-void RecursiveCollectDeps(const Target* target, std::set<Label>* result) {
-  if (result->find(target->label()) != result->end())
-    return;  // Already did this target.
-  result->insert(target->label());
-
-  const std::vector<const Target*>& deps = target->deps();
-  for (size_t i = 0; i < deps.size(); i++)
-    RecursiveCollectDeps(deps[i], result);
-}
-
-// Prints dependencies of the given target (not the target itself).
-void RecursivePrintDeps(const Target* target,
-                        const Label& default_toolchain,
-                        int indent_level) {
-  std::vector<const Target*> sorted_deps = target->deps();
-  std::sort(sorted_deps.begin(), sorted_deps.end(), CompareTargetLabel());
-
-  std::string indent(indent_level * 2, ' ');
-  for (size_t i = 0; i < sorted_deps.size(); i++) {
-    OutputString(indent +
-        sorted_deps[i]->label().GetUserVisibleName(default_toolchain) + "\n");
-    RecursivePrintDeps(sorted_deps[i], default_toolchain, indent_level + 1);
-  }
-}
-
-}  // namespace
-
-int RunDescCommand(const std::vector<std::string>& args) {
-  if (args.size() != 1) {
-    Err(Location(), "You're holding it wrong.",
-        "Usage: \"gn desc <target_name>\"").PrintToStdout();
-    return NULL;
-  }
-
-  const Target* target = GetTargetForDesc(args);
-  if (!target)
-    return 1;
-
-  // Generally we only want to display toolchains on labels when the toolchain
-  // is different than the default one for this target (which we always print
-  // in the header).
-  Label target_toolchain = target->label().GetToolchainLabel();
-
-  // Header.
-  std::string title_target =
-      "Target: " + target->label().GetUserVisibleName(false);
-  std::string title_toolchain =
-      "Toolchain: " + target_toolchain.GetUserVisibleName(false);
-  OutputString(title_target + "\n", DECORATION_YELLOW);
-  OutputString(title_toolchain + "\n", DECORATION_YELLOW);
-  OutputString(std::string(
-      std::max(title_target.size(), title_toolchain.size()), '=') + "\n");
-
-  OutputString("Sources:\n");
-  const Target::FileList& sources = target->sources();
-  for (size_t i = 0; i < sources.size(); i++)
-    OutputString("  " + sources[i].value() + "\n");
-
-  // Configs (don't sort since the order determines how things are processed).
-  OutputString("\nConfigs:\n");
-  const std::vector<const Config*>& configs = target->configs();
-  for (size_t i = 0; i < configs.size(); i++) {
-    OutputString("  " +
-        configs[i]->label().GetUserVisibleName(target_toolchain) + "\n");
-  }
-
-  // Deps. Sorted for convenience. Sort the labels rather than the strings so
-  // that "//foo:bar" comes before "//foo/third_party:bar".
-  OutputString("\nDirect dependencies:\n"
-               "(Use \"gn deps\" or \"gn tree\" to display recursive deps.)\n");
-  const std::vector<const Target*>& deps = target->deps();
-  std::vector<Label> sorted_deps;
-  for (size_t i = 0; i < deps.size(); i++)
-    sorted_deps.push_back(deps[i]->label());
-  std::sort(sorted_deps.begin(), sorted_deps.end());
-  for (size_t i = 0; i < sorted_deps.size(); i++) {
-    OutputString("  " + sorted_deps[i].GetUserVisibleName(target_toolchain) +
-                 "\n");
-  }
-  return 0;
-}
-
-int RunDepsCommand(const std::vector<std::string>& args) {
-  if (args.size() != 1) {
-    Err(Location(), "You're holding it wrong.",
-        "Usage: \"gn deps <target_name>\"").PrintToStdout();
-    return NULL;
-  }
-
-  const Target* target = GetTargetForDesc(args);
-  if (!target)
-    return 1;
-
-  // Generally we only want to display toolchains on labels when the toolchain
-  // is different than the default one for this target (which we always print
-  // in the header).
-  Label target_toolchain = target->label().GetToolchainLabel();
-
-  std::set<Label> all_deps;
-  RecursiveCollectDeps(target, &all_deps);
-
-  OutputString("Recursive dependencies of " +
-               target->label().GetUserVisibleName(true) + "\n",
-               DECORATION_YELLOW);
-
-  for (std::set<Label>::iterator i = all_deps.begin();
-       i != all_deps.end(); ++i)
-    OutputString("  " + i->GetUserVisibleName(target_toolchain) + "\n");
-  return 0;
-}
-
-int RunTreeCommand(const std::vector<std::string>& args) {
-  if (args.size() != 1) {
-    Err(Location(), "You're holding it wrong.",
-        "Usage: \"gn tree <target_name>\"").PrintToStdout();
-    return NULL;
-  }
-
-  const Target* target = GetTargetForDesc(args);
-  if (!target)
-    return 1;
-
-  OutputString(target->label().GetUserVisibleName(false) + "\n");
-  RecursivePrintDeps(target, target->label().GetToolchainLabel(), 1);
-
-  return 0;
-}