ENH: Add variable watch command

1 files changed, 136 insertions, 0 deletions

diff --git a/Source/cmVariableWatchCommand.cxx b/Source/cmVariableWatchCommand.cxx
new file mode 100644
index 0000000..8e83756
--- /dev/null
+++ b/Source/cmVariableWatchCommand.cxx
@@ -0,0 +1,136 @@
+/*=========================================================================
+
+  Program:   CMake - Cross-Platform Makefile Generator
+  Module:    $RCSfile$
+  Language:  C++
+  Date:      $Date$
+  Version:   $Revision$
+
+  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even 
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#include "cmVariableWatchCommand.h"
+
+#include "cmVariableWatch.h"
+
+//----------------------------------------------------------------------------
+static void cmVariableWatchCommandVariableAccessed(
+  const std::string& variable, int access_type, void* client_data,
+  const char* newValue, const cmMakefile* mf)
+{
+  cmVariableWatchCommand* command = static_cast<cmVariableWatchCommand*>(client_data);
+  command->VariableAccessed(variable, access_type, newValue, mf);
+}
+
+//----------------------------------------------------------------------------
+cmVariableWatchCommand::cmVariableWatchCommand()
+{
+  this->InCallback = false;
+}
+
+//----------------------------------------------------------------------------
+bool cmVariableWatchCommand::InitialPass(std::vector<std::string> const& args)
+{
+  if ( args.size() < 1 )
+    {
+    this->SetError("must be called with at least one argument.");
+    return false;
+    }
+  std::string variable = args[0];
+  if ( args.size() > 1 )
+    {
+    std::string command = args[1];
+    this->Handlers[variable].Commands.push_back(args[1]);
+    }
+  if ( variable == "CMAKE_CURRENT_LIST_FILE" )
+    {
+    cmOStringStream ostr;
+    ostr << "cannot be set on the variable: " << variable.c_str();
+    this->SetError(ostr.str().c_str());
+    return false;
+    }
+
+  this->Makefile->GetCMakeInstance()->GetVariableWatch()->AddWatch(
+    variable, cmVariableWatchCommandVariableAccessed, this);
+
+  return true;
+}
+
+//----------------------------------------------------------------------------
+void cmVariableWatchCommand::VariableAccessed(const std::string& variable,
+  int access_type, const char* newValue, const cmMakefile* mf)
+{
+  if ( this->InCallback )
+    {
+    return;
+    }
+  this->InCallback = true;
+
+  cmListFileFunction newLFF;
+  cmVariableWatchCommandHandler *handler = &this->Handlers[variable];
+  cmVariableWatchCommandHandler::VectorOfCommands::iterator it;
+  cmListFileArgument arg;
+  bool processed = false;
+  const char* accessString = cmVariableWatch::GetAccessAsString(access_type);
+  const char* currentListFile = mf->GetDefinition("CMAKE_CURRENT_LIST_FILE");
+
+  /// Ultra bad!!
+  cmMakefile* makefile = const_cast<cmMakefile*>(mf);
+
+  std::string stack = makefile->GetProperty("LISTFILE_STACK");
+  for ( it = handler->Commands.begin(); it != handler->Commands.end();
+    ++ it )
+    {
+    std::string command = *it;
+    newLFF.Arguments.clear();
+    newLFF.Arguments.push_back(cmListFileArgument(variable, true, "unknown", 9999));
+    newLFF.Arguments.push_back(cmListFileArgument(accessString, true, "unknown", 9999));
+    newLFF.Arguments.push_back(cmListFileArgument(newValue?newValue:"", true, "unknown", 9999));
+    newLFF.Arguments.push_back(cmListFileArgument(currentListFile, true, "unknown", 9999));
+    newLFF.Arguments.push_back(cmListFileArgument(stack, true, "unknown", 9999));
+    newLFF.Name = command; 
+    newLFF.FilePath = "Some weird path";
+    newLFF.Line = 9999;
+    if(!makefile->ExecuteCommand(newLFF))
+      {
+      arg.FilePath =  "Unknown";
+      arg.Line = 0;
+      cmOStringStream error;
+      error << "Error in cmake code at\n"
+        << arg.FilePath << ":" << arg.Line << ":\n"
+        << "A command failed during the invocation of callback\""
+        << command << "\".";
+      cmSystemTools::Error(error.str().c_str());
+      this->InCallback = false;
+      return;
+      }
+    processed = true;
+    }
+  if ( !processed )
+    {
+    cmOStringStream msg;
+    msg << "* Variable \"" << variable.c_str() << "\" was accessed using "
+      << accessString << " in: " << currentListFile << std::endl;
+    msg << "  The value of the variable: \"" << newValue << "\"" << std::endl;
+    msg << "  The list file stack: " << stack.c_str();
+    cmSystemTools::Message(msg.str().c_str());
+    std::vector<std::string> vars = makefile->GetDefinitions();
+    cmOStringStream msg2;
+    size_t cc;
+    for ( cc = 0; cc < vars.size(); cc ++ )
+      {
+      if ( vars[cc] == variable )
+        {
+        continue;
+        }
+      msg2 << vars[cc] << " = \"" << makefile->GetDefinition(vars[cc].c_str()) << "\"" << std::endl;
+      }
+    //cmSystemTools::Message(msg2.str().c_str());
+    }
+  this->InCallback = false;
+}