/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying

   file LICENSE.rst or https://cmake.org/licensing for details.  */

#include "cmFastbuildTargetGenerator.h"

#include <algorithm>

#include <cstddef>

#include <unordered_map>

#include <unordered_set>

#include <cm/memory>

#include <cm/optional>

#include <cm/string_view>

#include "cmCryptoHash.h"

#include "cmCustomCommand.h"

#include "cmCustomCommandGenerator.h"

#include "cmCustomCommandLines.h"

#include "cmFastbuildNormalTargetGenerator.h"

#include "cmFastbuildUtilityTargetGenerator.h"

#include "cmGeneratorExpression.h"

#include "cmGeneratorTarget.h"

#include "cmGlobalCommonGenerator.h"

#include "cmGlobalFastbuildGenerator.h"

#include "cmList.h"

#include "cmListFileCache.h"

#include "cmLocalCommonGenerator.h"

#include "cmLocalFastbuildGenerator.h"

#include "cmLocalGenerator.h"

#include "cmMakefile.h"

#include "cmOSXBundleGenerator.h"

#include "cmOutputConverter.h"

#include "cmRulePlaceholderExpander.h"

#include "cmSourceFile.h"

#include "cmState.h"

#include "cmStateTypes.h"

#include "cmStringAlgorithms.h"

#include "cmSystemTools.h"

#include "cmTarget.h"

#include "cmTargetTypes.h"

#include "cmValue.h"

#define FASTBUILD_DOLLAR_TAG "FASTBUILD_DOLLAR_TAG"

constexpr auto FASTBUILD_TRACK_BYPRODUCTS_AS_OUTPUT =

  "CMAKE_FASTBUILD_TRACK_BYPRODUCTS_AS_OUTPUT";

constexpr auto FASTBUILD_DISABLE_OUTPUT_PRECHECK_EXEC =

  "CMAKE_FASTBUILD_DISABLE_OUTPUT_PRECHECK_EXEC";

cmFastbuildTargetGenerator* cmFastbuildTargetGenerator::New(

  cmGeneratorTarget* target, std::string config)

{

  switch (target->GetType()) {

    case cm::TargetType::EXECUTABLE:

    case cm::TargetType::SHARED_LIBRARY:

    case cm::TargetType::STATIC_LIBRARY:

    case cm::TargetType::MODULE_LIBRARY:

    case cm::TargetType::OBJECT_LIBRARY:

      return new cmFastbuildNormalTargetGenerator(target, std::move(config));

    case cm::TargetType::UTILITY:

    case cm::TargetType::GLOBAL_TARGET:

    case cm::TargetType::INTERFACE_LIBRARY:

      return new cmFastbuildUtilityTargetGenerator(target, std::move(config));

    default:

      return nullptr;

  }

}

cmFastbuildTargetGenerator::cmFastbuildTargetGenerator(

  cmGeneratorTarget* target, std::string configParam)

  : cmCommonTargetGenerator(target)

  , LocalGenerator(

      static_cast<cmLocalFastbuildGenerator*>(target->GetLocalGenerator()))

  , TargetDirectDependencies(

      this->GlobalCommonGenerator->GetTargetDirectDepends(GeneratorTarget))

  , Config(std::move(configParam))

{

  this->MacOSXContentGenerator =

    cm::make_unique<MacOSXContentGeneratorType>(this, Config);

}

void cmFastbuildTargetGenerator::LogMessage(std::string const& m) const

{

  this->GetGlobalGenerator()->LogMessage(m);

}

std::string cmFastbuildTargetGenerator::GetUtilityAliasFromBuildStep(

  FastbuildBuildStep step) const

{

  if (step == FastbuildBuildStep::PRE_BUILD) {

    return GetTargetName() + FASTBUILD_PRE_BUILD_ALIAS_POSTFIX;

  }

  if (step == FastbuildBuildStep::PRE_LINK) {

    return GetTargetName() + FASTBUILD_PRE_LINK_ALIAS_POSTFIX;

  }

  if (step == FastbuildBuildStep::POST_BUILD) {

    return GetTargetName() + FASTBUILD_POST_BUILD_ALIAS_POSTFIX;

  }

  return GetTargetName() + FASTBUILD_CUSTOM_COMMAND_ALIAS_POSTFIX;

}

void cmFastbuildTargetGenerator::MacOSXContentGeneratorType::operator()(

  cmSourceFile const& source, char const* pkgloc,

  std::string const& configName)

{

  // Skip OS X content when not building a Framework or Bundle.

  if (!this->Generator->GetGeneratorTarget()->IsBundleOnApple()) {

    return;

  }

  // Get the input file location.

  std::string input = source.GetFullPath();

  input = this->Generator->GetGlobalGenerator()->ConvertToFastbuildPath(input);

  // Get the output file location.

  std::string output =

    this->Generator->OSXBundleGenerator->InitMacOSXContentDirectory(

      pkgloc, configName);

  output += "/";

  output += cmSystemTools::GetFilenameName(input);

  output =

    this->Generator->GetGlobalGenerator()->ConvertToFastbuildPath(output);

  FastbuildCopyNode node;

  node.Name = "Copy_" + output;

  node.Source = std::move(input);

  if (cmSystemTools::FileIsDirectory(node.Source)) {

    node.CopyDir = true;

  }

  node.Dest = std::move(output);

  // Just in case if "from" is generated by some custom command.

  // Tested in "BundleTest" test.

  node.PreBuildDependencies =

    this->Generator->GetTargetName() + FASTBUILD_CUSTOM_COMMAND_ALIAS_POSTFIX;

  this->Generator->CopyNodes.emplace_back(std::move(node));

}

std::string cmFastbuildTargetGenerator::GetCustomCommandTargetName(

  cmCustomCommand const& cc, FastbuildBuildStep step) const

{

  std::string const extra = this->Makefile->GetCurrentBinaryDirectory();

  std::string targetName = "cc";

  std::string extras = extra;

  // Compute hash based on commands & args & output.

  for (cmCustomCommandLine const& commandLine : cc.GetCommandLines()) {

    extras += cmJoin(commandLine, "");

  }

  for (std::string const& output : cc.GetOutputs()) {

    extras += output;

  }

  extras += std::to_string(static_cast<int>(step));

  cmCryptoHash hash(cmCryptoHash::AlgoSHA256);

  targetName += "-" + hash.HashString(extras).substr(0, 14);

  return targetName;

}

void cmFastbuildTargetGenerator::WriteScriptProlog(cmsys::ofstream& file) const

{

#ifdef _WIN32

  file << "@echo off\n";

#else

  file << "set -e\n\n";

#endif

}

void cmFastbuildTargetGenerator::WriteScriptEpilog(cmsys::ofstream& file) const

{

  (void)file;

#ifdef _WIN32

  file << "goto :EOF\n\n"

          ":ABORT\n"

          "set ERROR_CODE=%ERRORLEVEL%\n"

          "echo Batch file failed at line %FAIL_LINE% "

          "with errorcode %ERRORLEVEL%\n"

          "exit /b %ERROR_CODE%";

#endif

}

std::string cmFastbuildTargetGenerator::GetScriptWorkingDir(

  cmCustomCommandGenerator const& ccg) const

{

  std::string workingDirectory = ccg.GetWorkingDirectory();

  if (workingDirectory.empty()) {

    return this->LocalCommonGenerator->GetCurrentBinaryDirectory();

  }

  return workingDirectory;

}

std::string cmFastbuildTargetGenerator::GetScriptFilename(

  std::string const& utilityTargetName) const

{

  std::string scriptFileName = Makefile->GetCurrentBinaryDirectory();

  scriptFileName += "/CMakeFiles/";

  scriptFileName += utilityTargetName;

  scriptFileName += FASTBUILD_SCRIPT_FILE_EXTENSION;

  return scriptFileName;

}

void cmFastbuildTargetGenerator::AddCommentPrinting(

  std::vector<std::string>& cmdLines,

  cmCustomCommandGenerator const& ccg) const

{

  std::string cmakeCommand = this->GetLocalGenerator()->ConvertToOutputFormat(

    cmSystemTools::GetCMakeCommand(), cmOutputConverter::SHELL);

  auto const comment = ccg.GetComment();

  if (comment) {

    // Comment printing should be first. Tested in

    // RunCMake.ExternalProject:EnvVars-build test.

    cmdLines.insert(

      cmdLines.begin(),

      cmakeCommand.append(" -E echo ")

        .append(LocalGenerator->EscapeForShell(cmGeneratorExpression::Evaluate(

          *comment, this->LocalGenerator, Config))));

  }

}

std::string cmFastbuildTargetGenerator::GetCdCommand(

  cmCustomCommandGenerator const& ccg) const

{

  return cmStrCat(FASTBUILD_SCRIPT_CD,

                  this->LocalGenerator->ConvertToOutputFormat(

                    GetScriptWorkingDir(ccg), cmOutputConverter::SHELL));

}

void cmFastbuildTargetGenerator::WriteCmdsToFile(

  cmsys::ofstream& file, std::vector<std::string> const& cmds) const

{

#ifdef _WIN32

  int line = 1;

  for (auto cmd : cmds) {

    // On Windows batch, '%' is a special character that needs to be

    // doubled to be escaped

    cmSystemTools::ReplaceString(cmd, "%", "%%");

    file << cmd << " || (set FAIL_LINE=" << ++line << "& goto :ABORT)" << '\n';

#else

  for (auto const& cmd : cmds) {

    file << cmd << '\n';

#endif

  }

}

void cmFastbuildTargetGenerator::AddOutput(cmCustomCommandGenerator const& ccg,

                                           FastbuildExecNode& exec)

{

  std::string dummyOutput = cmSystemTools::JoinPath(

    { LocalCommonGenerator->GetMakefile()->GetHomeOutputDirectory(),

      "/_fbuild_dummy" });

  this->GetGlobalGenerator()->AllFoldersToClean.insert(dummyOutput);

  dummyOutput.append("/").append(exec.Name).append(

    FASTBUILD_DUMMY_OUTPUT_EXTENSION);

  std::vector<std::string> const& outputs = ccg.GetOutputs();

  std::vector<std::string> const& byproducts = ccg.GetByproducts();

  exec.OutputsAlias.Name = exec.Name + FASTBUILD_OUTPUTS_ALIAS_POSTFIX;

  // If CC doesn't have any output - we should always run it.

  // Tested in "RunCMake.CMakePresetsBuild" test.

  bool hasAnyNonSymbolicOutput = false;

  bool const trackByproducts =

    this->Makefile->IsDefinitionSet(FASTBUILD_TRACK_BYPRODUCTS_AS_OUTPUT);

  auto const isSymbolic = [this](std::string const& file) {

    cmSourceFile* sf = this->Makefile->GetSource(file);

    if (sf && sf->GetPropertyAsBool("SYMBOLIC")) {

      LogMessage("Skipping symbolic file: " + file);

      return true;

    }

    return false;

  };

  for (std::string const& output : outputs) {

    // Tested in "RunCMake.BuildDepends".

    if (isSymbolic(output)) {

      continue;

    }

    hasAnyNonSymbolicOutput = true;

    std::string const outputPath = this->ConvertToFastbuildPath(output);

    LogMessage("CC's output: " + outputPath);

    exec.OutputsAlias.PreBuildDependencies.emplace(outputPath);

    // Ensure output path exists. For some reason, "CMake -E touch" fails with

    // "cmake -E touch: failed to update "...

    cmSystemTools::MakeDirectory(cmSystemTools::GetFilenamePath(outputPath));

    this->GetGlobalGenerator()->AddFileToClean(outputPath);

  }

  exec.ByproductsAlias.Name = exec.Name + FASTBUILD_BYPRODUCTS_ALIAS_POSTFIX;

  for (std::string const& byproduct : byproducts) {

    if (trackByproducts) {

      hasAnyNonSymbolicOutput = true;

    }

    std::string const byproductPath = this->ConvertToFastbuildPath(byproduct);

    exec.ByproductsAlias.PreBuildDependencies.emplace(byproductPath);

    this->GetGlobalGenerator()->AddFileToClean(byproductPath);

  }

  auto const addDummyOutput = [&] {

    // So that the dummy file is always created.

    exec.ExecUseStdOutAsOutput = true;

    exec.ExecOutput = this->ConvertToFastbuildPath(dummyOutput);

    for (auto const& output : exec.OutputsAlias.PreBuildDependencies) {

      OutputsToReplace[output.Name] = exec.ExecOutput;

      LogMessage(cmStrCat("Adding replace from ", output.Name, " to ",

                          exec.ExecOutput));

    }

  };

  // We don't have any output that is expected to appear on disk -> run always.

  // Tested in "RunCMake.ExternalProject":BUILD_ALWAYS

  if (!hasAnyNonSymbolicOutput) {

    exec.ExecAlways = true;

    addDummyOutput();

    return;

  }

  if (!exec.OutputsAlias.PreBuildDependencies.empty()) {

    exec.ExecOutput = this->ConvertToFastbuildPath(

      exec.OutputsAlias.PreBuildDependencies.begin()->Name);

  } else {

    exec.ExecOutput = this->ConvertToFastbuildPath(

      exec.ByproductsAlias.PreBuildDependencies.begin()->Name);

  }

  // Optionally add the "deps-check" Exec if we have more than 1 OUTPUT, but

  // allow user to opt out.

  if (exec.OutputsAlias.PreBuildDependencies.size() > 1 &&

      !this->Makefile->IsDefinitionSet(

        FASTBUILD_DISABLE_OUTPUT_PRECHECK_EXEC)) {

    exec.NeedsDepsCheckExec = true;

  }

}

void cmFastbuildTargetGenerator::AddExecArguments(

  FastbuildExecNode& exec, std::string const& scriptFilename) const

{

  exec.ExecArguments =

    cmStrCat(FASTBUILD_SCRIPT_FILE_ARG,

             cmGlobalFastbuildGenerator::QuoteIfHasSpaces(scriptFilename));

  exec.ScriptFile = scriptFilename;

  exec.ExecExecutable =

    cmGlobalFastbuildGenerator::GetExternalShellExecutable();

}

void cmFastbuildTargetGenerator::GetDepends(

  cmCustomCommandGenerator const& ccg, std::string const& currentCCName,

  std::vector<std::string>& fileLevelDeps,

  std::set<FastbuildTargetDep>& targetDep) const

{

  for (auto dep : ccg.GetDepends()) {

    LogMessage("Dep: " + dep);

    auto orig = dep;

    if (this->LocalCommonGenerator->GetRealDependency(

          dep, Config, dep, ccg.GetCC().GetCMP0212Status())) {

      LogMessage("Real dep: " + dep);

      if (!dep.empty()) {

        LogMessage("Custom command real dep: " + dep);

        for (auto const& item : cmList{ cmGeneratorExpression::Evaluate(

               this->ConvertToFastbuildPath(dep), this->LocalGenerator,

               Config) }) {

          fileLevelDeps.emplace_back(item);

        }

      }

    }

    dep = this->ConvertToFastbuildPath(dep);

    LogMessage("Real dep converted: " + dep);

    auto const targetInfo = this->LocalGenerator->GetSourcesWithOutput(dep);

    if (targetInfo.Target) {

      LogMessage(

        cmStrCat("dep: ", dep, ", target: ", targetInfo.Target->GetName()));

      auto const& target = targetInfo.Target;

      auto const processCCs = [this, &currentCCName, &targetDep,

                               dep](std::vector<cmCustomCommand> const& ccs,

                                    FastbuildBuildStep step) {

        for (auto const& cc : ccs) {

          for (auto const& output : cc.GetOutputs()) {

            LogMessage(cmStrCat("dep: ", dep, ", post output: ",

                                this->ConvertToFastbuildPath(output)));

            if (this->ConvertToFastbuildPath(output) == dep) {

              auto ccName = this->GetCustomCommandTargetName(cc, step);

              if (ccName != currentCCName) {

                LogMessage("Additional CC dep from target: " + ccName);

                targetDep.emplace(std::move(ccName));

              }

            }

          }

          for (auto const& byproduct : cc.GetByproducts()) {

            LogMessage(cmStrCat("dep: ", dep, ", post byproduct: ",

                                this->ConvertToFastbuildPath(byproduct)));

            if (this->ConvertToFastbuildPath(byproduct) == dep) {

              auto ccName = this->GetCustomCommandTargetName(cc, step);

              if (ccName != currentCCName) {

                LogMessage("Additional CC dep from target: " + ccName);

                targetDep.emplace(std::move(ccName));

              }

            }

          }

        }

      };

      processCCs(target->GetPreBuildCommands(), FastbuildBuildStep::PRE_BUILD);

      processCCs(target->GetPreLinkCommands(), FastbuildBuildStep::PRE_LINK);

      processCCs(target->GetPostBuildCommands(),

                 FastbuildBuildStep::POST_BUILD);

      continue;

    }

    if (!targetInfo.Source) {

      LogMessage(cmStrCat("dep: ", dep, ", no source, byproduct: ",

                          targetInfo.SourceIsByproduct));

      // Tested in "OutDir" test.

      if (!cmSystemTools::FileIsFullPath(orig)) {

        targetDep.emplace(std::move(orig));

      }

      continue;

    }

    if (!targetInfo.Source->GetCustomCommand()) {

      LogMessage(cmStrCat("dep: ", dep, ", no GetCustomCommand"));

      continue;

    }

    if (targetInfo.Source && targetInfo.Source->GetCustomCommand()) {

      auto ccName = this->GetCustomCommandTargetName(

        *targetInfo.Source->GetCustomCommand(), FastbuildBuildStep::REST);

      if (ccName != currentCCName) {

        LogMessage("Additional CC dep: " + ccName);

        targetDep.emplace(std::move(ccName));

      }

    }

  }

}

void cmFastbuildTargetGenerator::ReplaceProblematicMakeVars(

  std::string& command) const

{

  // TODO: fix problematic global targets.  For now, search and replace the

  // makefile vars.

  cmSystemTools::ReplaceString(

    command, "$(CMAKE_SOURCE_DIR)",

    this->LocalGenerator->ConvertToOutputFormat(

      this->LocalGenerator->GetSourceDirectory(), cmOutputConverter::SHELL));

  cmSystemTools::ReplaceString(

    command, "$(CMAKE_BINARY_DIR)",

    this->LocalGenerator->ConvertToOutputFormat(

      this->LocalGenerator->GetBinaryDirectory(), cmOutputConverter::SHELL));

  cmSystemTools::ReplaceString(command, "$(ARGS)", "");

}

FastbuildExecNode cmFastbuildTargetGenerator::GetAppleTextStubCommand() const

{

  FastbuildExecNode res;

  if (!this->GeneratorTarget->IsApple() ||

      !this->GeneratorTarget->HasImportLibrary(Config)) {

    return res;

  }

  auto const names = DetectOutput();

  std::string const outpathImp =

    this->ConvertToFastbuildPath(this->GeneratorTarget->GetDirectory(

      Config, cmStateEnums::ImportLibraryArtifact));

  std::string const binPath =

    this->ConvertToFastbuildPath(this->GeneratorTarget->GetDirectory(

      Config, cmStateEnums::RuntimeBinaryArtifact));

  cmSystemTools::MakeDirectory(outpathImp);

  std::string rule = this->LocalGenerator->GetMakefile()->GetSafeDefinition(

    "CMAKE_CREATE_TEXT_STUBS");

  LogMessage("CMAKE_CREATE_TEXT_STUBS:" + rule);

  auto rulePlaceholderExpander =

    this->GetLocalGenerator()->CreateRulePlaceholderExpander();

  cmRulePlaceholderExpander::RuleVariables vars;

  res.ExecOutput = cmStrCat(outpathImp, '/', names.ImportReal);

  res.ExecInput = { cmStrCat(binPath, '/', names.SharedObject) };

  vars.Target = res.ExecInput[0].c_str();

  rulePlaceholderExpander->SetTargetImpLib(res.ExecOutput);

  rulePlaceholderExpander->ExpandRuleVariables(this->GetLocalGenerator(), rule,

                                               vars);

  LogMessage("CMAKE_CREATE_TEXT_STUBS expanded:" + rule);

  std::string executable;

  std::string args;

  if (!cmSystemTools::SplitProgramFromArgs(rule, executable, args)) {

    cmSystemTools::Error("Failed to split program from args: " + rule);

    return res;

  }

  res.Name = cmStrCat("create_", names.ImportOutput, "_text_stub");

  res.ExecExecutable = std::move(executable);

  res.ExecArguments = std::move(args);

  res.ExecWorkingDir = this->LocalCommonGenerator->GetCurrentBinaryDirectory();

  // Wait for the build.

  res.PreBuildDependencies.emplace(this->GetTargetName());

  return res;

}

namespace {

std::vector<std::vector<cm::string_view>> GroupDeps(

  FastbuildExecNode const& depender, size_t commandLineUsedLength)

{

  std::vector<cm::string_view> depsCheckExecNames;

  depsCheckExecNames.reserve(

    depender.OutputsAlias.PreBuildDependencies.size() +

    depender.ByproductsAlias.PreBuildDependencies.size());

  for (FastbuildTargetDep const& dep :

       depender.OutputsAlias.PreBuildDependencies) {

    depsCheckExecNames.emplace_back(dep.Name);

  }

  for (FastbuildTargetDep const& dep :

       depender.ByproductsAlias.PreBuildDependencies) {

    depsCheckExecNames.emplace_back(dep.Name);

  }

  size_t commandLineLimit = cmSystemTools::CalculateCommandLineLengthLimit();

  std::vector<std::vector<cm::string_view>> depsCheckExecNamesGrouped;

  if (commandLineLimit == 0) {

    depsCheckExecNamesGrouped.emplace_back(std::move(depsCheckExecNames));

    return depsCheckExecNamesGrouped;

  }

  commandLineLimit -= commandLineUsedLength;

  std::vector<cm::string_view> currentGroup;

  currentGroup.reserve(depsCheckExecNames.size());

  size_t currentGroupSizeMayUse = commandLineLimit;

  for (size_t i = 0; i < depsCheckExecNames.size(); ++i) {

    cm::string_view depsCheckExecName = depsCheckExecNames[i];

    if (currentGroupSizeMayUse > depsCheckExecName.size()) {

      currentGroup.emplace_back(depsCheckExecName);

      // +1 for the space between arguments

      currentGroupSizeMayUse -= depsCheckExecName.size() + 1;

      continue;

    }

    // Current dependency cannot be placed in the current group

    if (currentGroup.empty()) {

      cmSystemTools::Error(cmStrCat("Failed to group dependencies: command "

                                    "line limit exceeded. Filename too long: ",

                                    depsCheckExecName,

                                    ". Size limit: ", commandLineLimit));

      return {};

    }

    depsCheckExecNamesGrouped.emplace_back(std::move(currentGroup));

    currentGroup.clear();

    currentGroup.reserve(depsCheckExecNames.size() - i);

    currentGroupSizeMayUse = commandLineLimit;

    // Go back to the previous dependency to check if it can be placed in the

    // current group.

    --i;

  }

  if (!currentGroup.empty()) {

    depsCheckExecNamesGrouped.emplace_back(std::move(currentGroup));

  }

  return depsCheckExecNamesGrouped;

}

}

std::vector<FastbuildExecNode> cmFastbuildTargetGenerator::GetDepsCheckExecs(

  FastbuildExecNode const& depender)

{

  std::string const& executable = cmSystemTools::GetCMakeCommand();

  std::string execArgumentsBase =

    cmStrCat("-E cmake_fastbuild_check_depends ", depender.ExecOutput, ' ');

  std::vector<std::vector<cm::string_view>> depsCheckExecNamesGrouped =

    GroupDeps(depender, executable.size() + execArgumentsBase.size());

  std::vector<FastbuildExecNode> res;

  res.reserve(depsCheckExecNamesGrouped.size());

  for (size_t i = 0; i < depsCheckExecNamesGrouped.size(); ++i) {

    FastbuildExecNode exec;

    exec.Name = cmStrCat(depender.Name, "-check-depends-", i);

    exec.ExecAlways = true;

    exec.ExecUseStdOutAsOutput = true;

    exec.ExecOutput = cmStrCat(depender.ExecOutput, '.', i, ".deps-checker");

    exec.ExecExecutable = executable;

    exec.ExecArguments =

      cmJoinStrings(depsCheckExecNamesGrouped[i], " ", execArgumentsBase);

    res.emplace_back(std::move(exec));

  }

  return res;

}

FastbuildExecNodes cmFastbuildTargetGenerator::GenerateCommands(

  FastbuildBuildStep buildStep)

{

  FastbuildExecNodes execs;

  execs.Alias.Name = GetUtilityAliasFromBuildStep(buildStep);

  std::vector<cmCustomCommand> commands;

  if (buildStep == FastbuildBuildStep::PRE_BUILD) {

    commands = GeneratorTarget->GetPreBuildCommands();

    LogMessage("STEP: PRE_BUILD");

  } else if (buildStep == FastbuildBuildStep::PRE_LINK) {

    commands = GeneratorTarget->GetPreLinkCommands();

    LogMessage("STEP: PRE_LINK");

  } else if (buildStep == FastbuildBuildStep::POST_BUILD) {

    commands = GeneratorTarget->GetPostBuildCommands();

    LogMessage("STEP: POST_BUILD");

  } else {

    LogMessage("STEP: ALL CUSTOM COMMANDS");

    std::vector<cmSourceFile const*> customCommands;

    GeneratorTarget->GetCustomCommands(customCommands, Config);

    for (cmSourceFile const* source : customCommands) {

      cmCustomCommand const* cmd = source->GetCustomCommand();

      if (!cmd->GetCommandLines().empty()) {

        commands.emplace_back(*cmd);

      }

    }

  }

  LogMessage(cmStrCat("Number of custom commands: ", commands.size()));

  for (cmCustomCommand const& customCommand : commands) {

    cmCustomCommandGenerator ccg(customCommand, Config, LocalCommonGenerator);

    std::string launcher = this->MakeCustomLauncher(ccg);

    std::string const execName =

      GetCustomCommandTargetName(customCommand, buildStep);

    std::vector<std::string> cmdLines;

    if (ccg.GetNumberOfCommands() > 0) {

      cmdLines.push_back(GetCdCommand(ccg));

    }

    // Since we are not using FASTBuild Exec nodes natively, we need to

    // have shell specific escape.

    this->LocalGenerator->GetState()->SetFastbuildMake(false);

    // To avoid replacing $ with $$ in the command line.

    this->LocalGenerator->SetLinkScriptShell(true);

    for (unsigned j = 0; j != ccg.GetNumberOfCommands(); ++j) {

      std::string const command = ccg.GetCommand(j);

      // Tested in "CustomCommand" ("empty_command") test.

      if (!command.empty()) {

        cmdLines.emplace_back(launcher +

                              this->LocalGenerator->ConvertToOutputFormat(

                                command, cmOutputConverter::SHELL));

        std::string& cmd = cmdLines.back();

        ccg.AppendArguments(j, cmd);

        ReplaceProblematicMakeVars(cmd);

        LogMessage("cmCustomCommandLine: " + cmd);

      }

    }

    if (cmdLines.empty()) {

      return {};

    }

    this->LocalGenerator->GetState()->SetFastbuildMake(true);

    FastbuildExecNode execNode;

    execNode.Name = execName;

    // Add dependencies to "ExecInput" so that FASTBuild will re-run the Exec

    // when needed, but also add to "PreBuildDependencies" for correct sorting.

    // Tested in "ObjectLibrary / complexOneConfig" tests.

    GetDepends(ccg, execName, execNode.ExecInput,

               execNode.PreBuildDependencies);

    for (auto const& util : ccg.GetUtilities()) {

      auto const& utilTargetName = util.Value.first;

      LogMessage("Util: " + utilTargetName +

                 ", cross: " + std::to_string(util.Value.second));

      auto* const target = this->Makefile->FindTargetToUse(utilTargetName);

      if (target && target->IsImported()) {

        std::string importedLoc =

          this->ConvertToFastbuildPath(target->ImportedGetFullPath(

            Config, cmStateEnums::ArtifactType::RuntimeBinaryArtifact));

        if (importedLoc.empty()) {

          importedLoc =

            this->ConvertToFastbuildPath(target->ImportedGetFullPath(

              Config, cmStateEnums::ArtifactType::ImportLibraryArtifact));

        }

        LogMessage("adding file level dep on imported target: " + importedLoc);

        execNode.ExecInput.emplace_back(std::move(importedLoc));

        continue;

      }

      // This CC uses some executable produced by another target. Add explicit

      // dep. Tested in "CustomCommand" test.

      if (util.Value.second) {

        if (utilTargetName != customCommand.GetTarget()) {

          LogMessage("Adding util dep: " + utilTargetName);

          execNode.PreBuildDependencies.emplace(utilTargetName);

        }

      }

    }

    execs.Alias.PreBuildDependencies.emplace(execNode.Name);

    LogMessage(cmStrCat("cmdLines size ", cmdLines.size()));

    if (!cmdLines.empty()) {

      std::string const scriptFileName = GetScriptFilename(execName);

      cmsys::ofstream scriptFile(scriptFileName);

      AddOutput(ccg, execNode);

      AddExecArguments(execNode, scriptFileName);

      AddCommentPrinting(cmdLines, ccg);

      WriteScriptProlog(scriptFile);

      WriteCmdsToFile(scriptFile, cmdLines);

      WriteScriptEpilog(scriptFile);

    }

    if (buildStep == FastbuildBuildStep::POST_BUILD) {

      // Execute POST_BUILD in order in which they are declared.

      // Tested in "complex" test.

      for (auto& exec : execs.Nodes) {

        execNode.PreBuildDependencies.emplace(exec.Name);

      }

    }

    for (auto const& out : execNode.OutputsAlias.PreBuildDependencies) {

      LogMessage(cmStrCat("Adding replace from ", out.Name, " to ", execName));

      OutputToExecName[out.Name] = execName;

    }

    execs.Nodes.emplace_back(std::move(execNode));

  }

  for (auto& exec : execs.Nodes) {

    for (auto& inputFile : exec.ExecInput) {

      auto const iter = OutputsToReplace.find(inputFile);

      if (iter != OutputsToReplace.end()) {

        LogMessage(

          cmStrCat("Replacing input: ", inputFile, " with ", iter->second));

        inputFile = iter->second;

      }

      auto const depIter = std::find_if(

        exec.PreBuildDependencies.begin(), exec.PreBuildDependencies.end(),

        [this](FastbuildTargetDep const& dep) {

          return !OutputToExecName[dep.Name].empty();

        });

      if (depIter != exec.PreBuildDependencies.end()) {

        LogMessage(cmStrCat("Replacing dep ", depIter->Name, " with ",

                            OutputToExecName[depIter->Name]));

        exec.PreBuildDependencies.emplace(OutputToExecName[depIter->Name]);

        exec.PreBuildDependencies.erase(depIter);

      }

    }

    if (exec.NeedsDepsCheckExec) {

      std::vector<FastbuildExecNode> depsCheckExecs = GetDepsCheckExecs(exec);

      std::vector<cm::string_view> depsCheckExecNames;

      depsCheckExecNames.reserve(depsCheckExecs.size());

      for (FastbuildExecNode const& depsCheckExec : depsCheckExecs) {

        depsCheckExecNames.emplace_back(depsCheckExec.Name);

      }

      LogMessage(

        cmJoinStrings(depsCheckExecNames, ", ", "Adding deps check Exec: "));

      for (FastbuildExecNode& depsCheckExec : depsCheckExecs) {

        exec.PreBuildDependencies.emplace(depsCheckExec.Name);

        this->GetGlobalGenerator()->AddTarget(std::move(depsCheckExec));

      }

    }

  }

  return execs;

}

std::string cmFastbuildTargetGenerator::MakeCustomLauncher(

  cmCustomCommandGenerator const& ccg)

{

  // Copied from cmLocalNinjaGenerator::MakeCustomLauncher.

  cmValue property_value = this->Makefile->GetProperty("RULE_LAUNCH_CUSTOM");

  if (!cmNonempty(property_value)) {

    return std::string();

  }

  // Expand rule variables referenced in the given launcher command.

  cmRulePlaceholderExpander::RuleVariables vars;

  std::string output;

  std::vector<std::string> const& outputs = ccg.GetOutputs();

  for (size_t i = 0; i < outputs.size(); ++i) {

    output =

      cmStrCat(output,

               this->LocalGenerator->ConvertToOutputFormat(

                 ccg.GetWorkingDirectory().empty()

                   ? this->LocalGenerator->MaybeRelativeToCurBinDir(outputs[i])

                   : outputs[i],

                 cmOutputConverter::SHELL));

    if (i != outputs.size() - 1) {

      output = cmStrCat(output, ',');

    }

  }

  vars.Output = output.c_str();

  std::string filePathWithOutput = ccg.StoreContentToFile(output);

  vars.FilePathWithOutput = filePathWithOutput.c_str();

  vars.Role = ccg.GetCC().GetRole().c_str();

  vars.CMTargetName = ccg.GetCC().GetTarget().c_str();

  vars.Config = ccg.GetOutputConfig().c_str();

  auto rulePlaceholderExpander =

    this->LocalGenerator->CreateRulePlaceholderExpander();

  std::string launcher = *property_value;

  rulePlaceholderExpander->ExpandRuleVariables(this->LocalGenerator, launcher,

                                               vars);

  if (!launcher.empty()) {

    launcher += " ";

  }

  LogMessage("CC Launcher: " + launcher);

  return launcher;

}

std::string cmFastbuildTargetGenerator::GetTargetName() const

{

  if (this->GeneratorTarget->GetType() == cm::TargetType::GLOBAL_TARGET) {

    return this->GetGlobalGenerator()->GetTargetName(GeneratorTarget);

  }

  return this->GeneratorTarget->GetName();

}

cmGeneratorTarget::Names cmFastbuildTargetGenerator::DetectOutput() const

{

  if (GeneratorTarget->GetType() == cm::TargetType::EXECUTABLE) {

    return GeneratorTarget->GetExecutableNames(Config);

  }

  return GeneratorTarget->GetLibraryNames(Config);

}

void cmFastbuildTargetGenerator::AddObjectDependencies(

  FastbuildTarget& fastbuildTarget,

  std::vector<std::string>& allObjectDepends) const

{

  auto const FindObjListWhichOutputs = [&fastbuildTarget](

                                         std::string const& output) {

    for (FastbuildObjectListNode const& objList :

         fastbuildTarget.ObjectListNodes) {

      if (objList.ObjectOutputs.find(output) != objList.ObjectOutputs.end()) {

        return objList.Name;

      }

    }

    return std::string{};

  };

  for (FastbuildObjectListNode& objList : fastbuildTarget.ObjectListNodes) {

    for (auto const& objDep : objList.ObjectDepends) {

      // Check if there is another object list which outputs (OBJECT_OUTPUTS)

      // something that this object list needs (OBJECT_DEPENDS).

      auto anotherObjList = FindObjListWhichOutputs(objDep);

      if (!anotherObjList.empty()) {

        LogMessage("Adding explicit <OBJECT_DEPENDS> dep: " + anotherObjList);

        allObjectDepends.emplace_back(anotherObjList);

        objList.PreBuildDependencies.emplace(std::move(anotherObjList));

      } else {

        LogMessage("Adding <OBJECT_DEPENDS> dep: " + objDep);

        allObjectDepends.emplace_back(objDep);

        objList.PreBuildDependencies.emplace(objDep);

      }

    }

  }

  cmGlobalFastbuildGenerator::TopologicalSort(fastbuildTarget.ObjectListNodes);

}

void cmFastbuildTargetGenerator::AddLinkerNodeDependencies(

  FastbuildTarget& fastbuildTarget)

{

  for (auto& linkerNode : fastbuildTarget.LinkerNode) {

    if (!fastbuildTarget.PreLinkExecNodes.Nodes.empty()) {

      linkerNode.PreBuildDependencies.emplace(

        fastbuildTarget.Name + FASTBUILD_PRE_LINK_ALIAS_POSTFIX);

    }

  }

}

std::string cmFastbuildTargetGenerator::GetClangTidyReplacementsFilePath(

  std::string const& directory, cmSourceFile const& source,

  std::string const& /*config*/) const

{

  std::string objectDir =

    this->ConvertToFastbuildPath(this->GeneratorTarget->GetSupportDirectory());

  std::string const& objectName =

    this->GeneratorTarget->GetObjectName(&source);

  std::string path =

    cmStrCat(directory, '/', objectDir, '/', objectName, ".yaml");

  LogMessage("ClangTidy replacements file: " + path);

  return path;