cmState: Compute and store directory components.

There is no need to duplicate these in all cmLocalGenerators.

Rename the symbols according to current conventions.

Add explicit calls to Set{Source,Binary}Directory with empty strings
in order to trigger the population of the components containers with
the current working directory in cmLocalGenerator.  Having
directories set to empty is a special case in CMake, which is relied
on for the `if(CMAKE_BINARY_DIR)` condition at the end of
CMakeDetermineSystem.cmake.

Source/CPack/cmCPackGenerator.cxx

@@ -711,6 +711,8 @@ int cmCPackGenerator::InstallProjectViaInstallCMakeProjects(
           }
 
         cmake cm;
+        cm.SetHomeDirectory("");
+        cm.SetHomeOutputDirectory("");
         cm.AddCMakePaths();
         cm.SetProgressCallback(cmCPackGeneratorProgress, this);
         cmGlobalGenerator gg;

Source/CPack/cpack.cxx

@@ -198,6 +198,8 @@ int main (int argc, char const* const* argv)
     "Read CPack config file: " << cpackConfigFile << std::endl);
 
   cmake cminst;
+  cminst.SetHomeDirectory("");
+  cminst.SetHomeOutputDirectory("");
   cminst.GetState()->RemoveUnscriptableCommands();
   cmGlobalGenerator cmgg;
   cmgg.SetCMakeInstance(&cminst);

Source/CTest/cmCTestBuildAndTestHandler.cxx

@@ -204,6 +204,8 @@ int cmCTestBuildAndTestHandler::RunCMakeAndTest(std::string* outstring)
     }
 
   cmake cm;
+  cm.SetHomeDirectory("");
+  cm.SetHomeOutputDirectory("");
   std::string cmakeOutString;
   cmCTestBuildAndTestCaptureRAII captureRAII(cm, cmakeOutString);
   static_cast<void>(captureRAII);

Source/CTest/cmCTestLaunch.cxx

@@ -750,6 +750,8 @@ int cmCTestLaunch::Main(int argc, const char* const argv[])
 void cmCTestLaunch::LoadConfig()
 {
   cmake cm;
+  cm.SetHomeDirectory("");
+  cm.SetHomeOutputDirectory("");
   cmGlobalGenerator gg;
   gg.SetCMakeInstance(&cm);
   cmsys::auto_ptr<cmLocalGenerator> lg(gg.CreateLocalGenerator());

Source/CTest/cmCTestScriptHandler.cxx

@@ -336,6 +336,8 @@ void cmCTestScriptHandler::CreateCMake()
     delete this->LocalGenerator;
     }
   this->CMake = new cmake;
+  this->CMake->SetHomeDirectory("");
+  this->CMake->SetHomeOutputDirectory("");
   this->CMake->AddCMakePaths();
   this->GlobalGenerator = new cmGlobalGenerator;
   this->GlobalGenerator->SetCMakeInstance(this->CMake);

Source/CTest/cmCTestTestHandler.cxx

@@ -1571,6 +1571,8 @@ void cmCTestTestHandler::GetListOfTests()
   cmCTestOptionalLog(this->CTest, HANDLER_VERBOSE_OUTPUT,
     "Constructing a list of tests" << std::endl, this->Quiet);
   cmake cm;
+  cm.SetHomeDirectory("");
+  cm.SetHomeOutputDirectory("");
   cmGlobalGenerator gg;
   gg.SetCMakeInstance(&cm);
   cmsys::auto_ptr<cmLocalGenerator> lg(gg.CreateLocalGenerator());

Source/CursesDialog/ccmake.cxx

@@ -104,6 +104,8 @@ int main(int argc, char const* const* argv)
   if(doc.CheckOptions(argc, argv))
     {
     cmake hcm;
+    hcm.SetHomeDirectory("");
+    hcm.SetHomeOutputDirectory("");
     hcm.AddCMakePaths();
     std::vector<cmDocumentationEntry> generators;
     hcm.GetGeneratorDocumentation(generators);

Source/QtDialog/CMakeSetup.cxx

@@ -64,6 +64,8 @@ int main(int argc, char** argv)
     {
     // Construct and print requested documentation.
     cmake hcm;
+    hcm.SetHomeDirectory("");
+    hcm.SetHomeOutputDirectory("");
     hcm.AddCMakePaths();
 
     std::vector<cmDocumentationEntry> generators;

Source/cmCTest.cxx

@@ -510,6 +510,8 @@ int cmCTest::Initialize(const char* binary_dir, cmCTestStartCommand* command)
     }
 
   cmake cm;
+  cm.SetHomeDirectory("");
+  cm.SetHomeOutputDirectory("");
   cmGlobalGenerator gg;
   gg.SetCMakeInstance(&cm);
   cmsys::auto_ptr<cmLocalGenerator> lg(gg.CreateLocalGenerator());

Source/cmGraphVizWriter.cxx

@@ -65,6 +65,8 @@ void cmGraphVizWriter::ReadSettings(const char* settingsFileName,
                                     const char* fallbackSettingsFileName)
 {
   cmake cm;
+  cm.SetHomeDirectory("");
+  cm.SetHomeOutputDirectory("");
   cmGlobalGenerator ggi;
   ggi.SetCMakeInstance(&cm);
   cmsys::auto_ptr<cmLocalGenerator> lg(ggi.CreateLocalGenerator());

Source/cmLocalGenerator.cxx

@@ -201,18 +201,11 @@ void cmLocalGenerator::SetupPathConversions()
   // Setup the current output directory components for use by
   // Convert
   std::string outdir;
-  outdir =
-    cmSystemTools::CollapseFullPath(this->GetState()->GetSourceDirectory());
-  cmSystemTools::SplitPath(outdir, this->HomeDirectoryComponents);
+
   outdir = cmSystemTools::CollapseFullPath(
       this->StateSnapshot.GetCurrentSourceDirectory());
   cmSystemTools::SplitPath(outdir, this->StartDirectoryComponents);
 
-  outdir = cmSystemTools::CollapseFullPath
-    (this->GetState()->GetBinaryDirectory());
-  cmSystemTools::SplitPath(outdir,
-                           this->HomeOutputDirectoryComponents);
-
   outdir = cmSystemTools::CollapseFullPath
     (this->StateSnapshot.GetCurrentBinaryDirectory());
   cmSystemTools::SplitPath(outdir,
@@ -2721,8 +2714,8 @@ std::string cmLocalGenerator::Convert(const std::string& source,
       {
       case HOME:
         //result = cmSystemTools::CollapseFullPath(result.c_str());
-        result = this->ConvertToRelativePath(this->HomeDirectoryComponents,
-                                             result);
+        result = this->ConvertToRelativePath(
+            this->GetState()->GetSourceDirectoryComponents(), result);
         break;
       case START:
         //result = cmSystemTools::CollapseFullPath(result.c_str());
@@ -2732,8 +2725,8 @@ std::string cmLocalGenerator::Convert(const std::string& source,
       case HOME_OUTPUT:
         //result = cmSystemTools::CollapseFullPath(result.c_str());
         result =
-          this->ConvertToRelativePath(this->HomeOutputDirectoryComponents,
-                                      result);
+          this->ConvertToRelativePath(
+              this->GetState()->GetBinaryDirectoryComponents(), result);
         break;
       case START_OUTPUT:
         //result = cmSystemTools::CollapseFullPath(result.c_str());

Source/cmLocalGenerator.h

@@ -458,9 +458,7 @@ protected:
   cmMakefile *Makefile;
   cmState::Snapshot StateSnapshot;
   cmGlobalGenerator *GlobalGenerator;
-  std::vector<std::string> HomeDirectoryComponents;
   std::vector<std::string> StartDirectoryComponents;
-  std::vector<std::string> HomeOutputDirectoryComponents;
   std::vector<std::string> StartOutputDirectoryComponents;
   cmLocalGenerator* Parent;
   std::vector<cmLocalGenerator*> Children;

Source/cmState.cxx

@@ -458,6 +458,10 @@ void cmState::SetSourceDirectory(std::string const& sourceDirectory)
 {
   this->SourceDirectory = sourceDirectory;
   cmSystemTools::ConvertToUnixSlashes(this->SourceDirectory);
+
+  cmSystemTools::SplitPath(
+      cmSystemTools::CollapseFullPath(this->SourceDirectory),
+        this->SourceDirectoryComponents);
 }
 
 const char* cmState::GetSourceDirectory() const
@@ -465,10 +469,19 @@ const char* cmState::GetSourceDirectory() const
   return this->SourceDirectory.c_str();
 }
 
+std::vector<std::string> const& cmState::GetSourceDirectoryComponents() const
+{
+  return this->SourceDirectoryComponents;
+}
+
 void cmState::SetBinaryDirectory(std::string const& binaryDirectory)
 {
   this->BinaryDirectory = binaryDirectory;
   cmSystemTools::ConvertToUnixSlashes(this->BinaryDirectory);
+
+  cmSystemTools::SplitPath(
+      cmSystemTools::CollapseFullPath(this->BinaryDirectory),
+        this->BinaryDirectoryComponents);
 }
 
 const char* cmState::GetBinaryDirectory() const
@@ -476,6 +489,11 @@ const char* cmState::GetBinaryDirectory() const
   return this->BinaryDirectory.c_str();
 }
 
+std::vector<std::string> const& cmState::GetBinaryDirectoryComponents() const
+{
+  return this->BinaryDirectoryComponents;
+}
+
 cmState::Snapshot cmState::CreateSnapshot(Snapshot originSnapshot)
 {
   PositionType pos = this->ParentPositions.size();

Source/cmState.h

@@ -123,6 +123,9 @@ public:
   const char* GetBinaryDirectory() const;
   void SetBinaryDirectory(std::string const& binaryDirectory);
 
+  std::vector<std::string> const& GetSourceDirectoryComponents() const;
+  std::vector<std::string> const& GetBinaryDirectoryComponents() const;
+
 private:
   std::map<cmProperty::ScopeType, cmPropertyDefinitionMap> PropertyDefinitions;
   std::vector<std::string> EnabledLanguages;
@@ -132,6 +135,9 @@ private:
   std::vector<std::string> Locations;
   std::vector<std::string> OutputLocations;
   std::vector<PositionType> ParentPositions;
+
+  std::vector<std::string> SourceDirectoryComponents;
+  std::vector<std::string> BinaryDirectoryComponents;
   std::string SourceDirectory;
   std::string BinaryDirectory;
   bool IsInTryCompile;

Source/cmake.cxx

@@ -1925,6 +1925,8 @@ int cmake::CheckBuildSystem()
   // Read the rerun check file and use it to decide whether to do the
   // global generate.
   cmake cm;
+  cm.SetHomeDirectory("");
+  cm.SetHomeOutputDirectory("");
   cmGlobalGenerator gg;
   gg.SetCMakeInstance(&cm);
   cmsys::auto_ptr<cmLocalGenerator> lg(gg.CreateLocalGenerator());
@@ -2580,6 +2582,9 @@ int cmake::Build(const std::string& dir,
                  const std::vector<std::string>& nativeOptions,
                  bool clean)
 {
+
+  this->SetHomeDirectory("");
+  this->SetHomeOutputDirectory("");
   if(!cmSystemTools::FileIsDirectory(dir))
     {
     std::cerr << "Error: " << dir << " is not a directory\n";

Source/cmakemain.cxx

@@ -214,6 +214,8 @@ int do_cmake(int ac, char const* const* av)
     {
     // Construct and print requested documentation.
     cmake hcm;
+    hcm.SetHomeDirectory("");
+    hcm.SetHomeOutputDirectory("");
     hcm.AddCMakePaths();
 
     // the command line args are processed here so that you can do
@@ -317,10 +319,14 @@ int do_cmake(int ac, char const* const* av)
   if (sysinfo)
     {
     cmake cm;
+    cm.SetHomeDirectory("");
+    cm.SetHomeOutputDirectory("");
     int ret = cm.GetSystemInformation(args);
     return ret;
     }
   cmake cm;
+  cm.SetHomeDirectory("");
+  cm.SetHomeOutputDirectory("");
   cmSystemTools::SetMessageCallback(cmakemainMessageCallback, (void *)&cm);
   cm.SetProgressCallback(cmakemainProgressCallback, (void *)&cm);
   cm.SetWorkingMode(workingMode);

Source/ctest.cxx

@@ -160,6 +160,8 @@ int main (int argc, char const* const* argv)
     if(doc.CheckOptions(argc, argv))
       {
       cmake hcm;
+      hcm.SetHomeDirectory("");
+      hcm.SetHomeOutputDirectory("");
       hcm.AddCMakePaths();
 
       // Construct and print requested documentation.