ENH: Refactor cmInstallGenerator for re-use

A new cmScriptGenerator base class factors out the non-install-specific
part of cmInstallGenerator.  This will be useful for other generators
that want per-configuration functionality.

Source/cmScriptGenerator.h

@@ -0,0 +1,99 @@
+/*=========================================================================
+
+  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 cmScriptGenerator_h
+#define cmScriptGenerator_h
+
+#include "cmStandardIncludes.h"
+
+class cmScriptGeneratorIndent
+{
+public:
+  cmScriptGeneratorIndent(): Level(0) {}
+  cmScriptGeneratorIndent(int level): Level(level) {}
+  void Write(std::ostream& os) const
+    {
+    for(int i=0; i < this->Level; ++i)
+      {
+      os << " ";
+      }
+    }
+  cmScriptGeneratorIndent Next(int step = 2) const
+    {
+    return cmScriptGeneratorIndent(this->Level + step);
+    }
+private:
+  int Level;
+};
+inline std::ostream& operator<<(std::ostream& os,
+                                cmScriptGeneratorIndent const& indent)
+{
+  indent.Write(os);
+  return os;
+}
+
+/** \class cmScriptGenerator
+ * \brief Support class for generating install and test scripts.
+ *
+ */
+class cmScriptGenerator
+{
+public:
+  cmScriptGenerator(const char* config_var,
+                    std::vector<std::string> const& configurations);
+  virtual ~cmScriptGenerator();
+
+  void Generate(std::ostream& os, const char* config,
+                std::vector<std::string> const& configurationTypes);
+
+  const std::vector<std::string>& GetConfigurations() const
+    { return this->Configurations; }
+
+protected:
+  typedef cmScriptGeneratorIndent Indent;
+  virtual void GenerateScript(std::ostream& os);
+  virtual void GenerateScriptConfigs(std::ostream& os, Indent const& indent);
+  virtual void GenerateScriptActions(std::ostream& os, Indent const& indent);
+  virtual void GenerateScriptForConfig(std::ostream& os,
+                                       const char* config,
+                                       Indent const& indent);
+
+  // Test if this generator does something for a given configuration.
+  bool GeneratesForConfig(const char*);
+
+  std::string CreateConfigTest(const char* config);
+  std::string CreateConfigTest(std::vector<std::string> const& configs);
+  std::string CreateComponentTest(const char* component);
+
+  // Information shared by most generator types.
+  std::string RuntimeConfigVariable;
+  std::vector<std::string> const Configurations;
+
+  // Information used during generation.
+  const char* ConfigurationName;
+  std::vector<std::string> const* ConfigurationTypes;
+
+  // True if the subclass needs to generate an explicit rule for each
+  // configuration.  False if the subclass only generates one rule for
+  // all enabled configurations.
+  bool ActionsPerConfig;
+
+private:
+  void GenerateScriptActionsOnce(std::ostream& os, Indent const& indent);
+  void GenerateScriptActionsPerConfig(std::ostream& os, Indent const& indent);
+};
+
+#endif