ENH: Start working on a general file manipulation command

Source/cmCommands.cxx

@@ -34,6 +34,7 @@
 #include "cmEndForEachCommand.cxx"
 #include "cmEndIfCommand.cxx"
 #include "cmExecProgramCommand.cxx"
+#include "cmFileCommand.cxx"
 #include "cmFindFileCommand.cxx"
 #include "cmFindLibraryCommand.cxx"
 #include "cmFindPackageCommand.cxx"
@@ -125,6 +126,7 @@ void GetPredefinedCommands(std::list<cmCommand*>& commands)
   commands.push_back(new cmEndForEachCommand);
   commands.push_back(new cmEndIfCommand);
   commands.push_back(new cmExecProgramCommand);
+  commands.push_back(new cmFileCommand);
   commands.push_back(new cmFindFileCommand);
   commands.push_back(new cmFindLibraryCommand);
   commands.push_back(new cmFindPackageCommand);

Source/cmFileCommand.cxx

+/*=========================================================================
+
+  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 "cmFileCommand.h"
+
+// cmLibraryCommand
+bool cmFileCommand::InitialPass(std::vector<std::string> const& args)
+{
+  if(args.size() < 2 )
+    {
+    this->SetError("must be called with at least two arguments.");
+    return false;
+    }
+  std::string subCommand = args[0];
+  if ( subCommand == "WRITE" )
+    {
+    return this->HandleWriteCommand(args, false);
+    }
+  else if ( subCommand == "APPEND" )
+    {
+    return this->HandleWriteCommand(args, true);
+    }
+  else if ( subCommand == "READ" )
+    {
+    return this->HandleReadCommand(args);
+    }
+
+  std::string e = "does not recognize sub-command "+subCommand;
+  this->SetError(e.c_str());
+  return true;
+}
+
+//----------------------------------------------------------------------------
+bool cmFileCommand::HandleWriteCommand(std::vector<std::string> const& args, 
+  bool append)
+{
+  std::string message;
+  std::vector<std::string>::const_iterator i = args.begin();
+
+  i++; // Get rid of subcommand
+
+  std::string fileName = *i;
+  i++;
+
+  for(;i != args.end(); ++i)
+    {
+    message += *i;
+    }
+  std::string dir = cmSystemTools::GetFilenamePath(fileName);
+  cmSystemTools::MakeDirectory(dir.c_str());
+
+  std::ofstream file(fileName.c_str(), append?std::ios::app: std::ios::out);
+  if ( !file )
+    {
+    std::string error = "Internal CMake error when trying to open file: ";
+    error += fileName.c_str();
+    error += " for writting.";
+    this->SetError(error.c_str());
+    return false;
+    }
+  file << message << std::endl;
+  file.close();
+  return true;
+}
+
+//----------------------------------------------------------------------------
+bool cmFileCommand::HandleReadCommand(std::vector<std::string> const& args)
+{
+  if ( args.size() != 3 )
+    {
+    this->SetError("READ must be called with two additional arguments");
+    }
+
+  std::string fileName = args[1];
+  std::string variable = args[2];
+  std::ifstream file(fileName.c_str(), std::ios::in);
+  if ( !file )
+    {
+    std::string error = "Internal CMake error when trying to open file: ";
+    error += fileName.c_str();
+    error += " for reading.";
+    this->SetError(error.c_str());
+    return false;
+    }
+
+  std::string output;
+  std::string line;
+  bool has_newline = false;
+  while ( cmSystemTools::GetLineFromStream(file, line, &has_newline) )
+    {
+    output += line;
+    if ( has_newline )
+      {
+      output += "\n";
+      }
+    }
+  m_Makefile->AddDefinition(variable.c_str(), output.c_str());
+  return true;
+}
+

Source/cmFileCommand.h

+/*=========================================================================
+
+  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.
+
+=========================================================================*/
+#ifndef cmFileCommand_h
+#define cmFileCommand_h
+
+#include "cmStandardIncludes.h"
+#include "cmCommand.h"
+
+/** \class cmFileCommand
+ * \brief Command for manipulation of files
+ *
+ */
+class cmFileCommand : public cmCommand
+{
+public:
+  /**
+   * This is a virtual constructor for the command.
+   */
+  virtual cmCommand* Clone() 
+    {
+    return new cmFileCommand;
+    }
+
+  /**
+   * This is called when the command is first encountered in
+   * the CMakeLists.txt file.
+   */
+  virtual bool InitialPass(std::vector<std::string> const& args);
+
+  /**
+   * This determines if the command gets propagated down
+   * to makefiles located in subdirectories.
+   */
+  virtual bool IsInherited() {return true;}
+
+  /**
+   * The name of the command as specified in CMakeList.txt.
+   */
+  virtual const char* GetName() { return "FILE";}
+
+  /**
+   * Succinct documentation.
+   */
+  virtual const char* GetTerseDocumentation() 
+    {
+    return "File manipulation command.";
+    }
+  
+  /**
+   * More documentation.
+   */
+  virtual const char* GetFullDocumentation()
+    {
+    return
+      "  FILE(WRITE filename \"message to write\"... )\n"
+      "  FILE(APPEND filename \"message to write\"... )\n"
+      "  FILE(READ filename variable)\n"
+      "WRITE will write a message into a file called 'filename'. It "
+      "overwrites the file if it already exists, and creates the file "
+      "if it does not exists.\n\n"
+      "APPEND will write a message into a file same as WRITE, except "
+      "it will append it to the end of the file\n\n"
+      "READ will read the content of a file and store it into a "
+      "variable.\n\n"; }
+  
+  cmTypeMacro(cmFileCommand, cmCommand);
+
+protected:
+  bool HandleWriteCommand(std::vector<std::string> const& args, bool append);
+  bool HandleReadCommand(std::vector<std::string> const& args);
+};
+
+
+#endif