#
 #             ORXONOX - the hottest 3D action shooter ever to exist
 #                             > www.orxonox.net <
 #
 #        This program is free software; you can redistribute it and/or
 #         modify it under the terms of the GNU General Public License
 #        as published by the Free Software Foundation; either version 2
 #            of the License, or (at your option) any later version.
 #
 #       This program is distributed in the hope that it will be useful,
 #        but WITHOUT ANY WARRANTY; without even the implied warranty of
 #        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 #                 GNU General Public License for more details.
 #
 #   You should have received a copy of the GNU General Public License along
 #      with this program; if not, write to the Free Software Foundation,
 #     Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #
 #
 #  Author:
 #    Reto Grieder
 #  Description:
 #    Several functions that help organising the source tree.
 #    [ADD/SET]_SOURCE_FILES - Writes source files to the cache by force and
 #                             adds the current directory.
 #                             Also compiles multiple source files into a single
 #                             translation unit (faster)
 #                             Use [END_]BUILD_UNIT in
 #                             [ADD|SET]_SOURCE_FILES and specify the name of
 #                             the new source file after BUILD_UNIT
 #    GET_ALL_HEADER_FILES   - Finds all header files recursively.
 #    GENERATE_SOURCE_GROUPS - Set Visual Studio source groups.
 #

FUNCTION(PREPARE_SOURCE_FILES)
  SET(_source_files)
  FOREACH(_file ${ARGN})
    IF(_file MATCHES "^(BUILD_UNIT|END_BUILD_UNIT)$")
      # Append keywords verbatim
      LIST(APPEND _source_files ${_file})
    ELSE()
      # Store file with path relative to the root source directory
      FILE(RELATIVE_PATH _file_rel ${CMAKE_SOURCE_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/${_file})
      LIST(APPEND _source_files ./${_file_rel})
    ENDIF()
  ENDFOREACH(_file)
  SET(_source_files ${_source_files} PARENT_SCOPE)
ENDFUNCTION(PREPARE_SOURCE_FILES)


# Adds source files with the full path to a list
FUNCTION(ADD_SOURCE_FILES _varname)
  PREPARE_SOURCE_FILES(${ARGN})
  # Write into the cache to avoid variable scoping in subdirs
  SET(${_varname} ${${_varname}} ${_source_files} CACHE INTERNAL "Do not edit")
ENDFUNCTION(ADD_SOURCE_FILES)


# Sets source files with the full path
FUNCTION(SET_SOURCE_FILES _varname)
  PREPARE_SOURCE_FILES(${ARGN})
  # Write into the cache to avoid variable scoping in subdirs
  SET(${_varname} ${_source_files} CACHE INTERNAL "Do not edit")
ENDFUNCTION(SET_SOURCE_FILES)


# Search the entire directory tree for header files and add them to a variable
MACRO(GET_ALL_HEADER_FILES _target_varname)
  FILE(GLOB_RECURSE ${_target_varname} ${CMAKE_CURRENT_SOURCE_DIR} "*.h")
ENDMACRO(GET_ALL_HEADER_FILES)


# Generate source groups according to the directory structure
FUNCTION(GENERATE_SOURCE_GROUPS)

  FOREACH(_file ${ARGN})
    GET_SOURCE_FILE_PROPERTY(_full_filepath ${_file} LOCATION)
    FILE(RELATIVE_PATH _relative_path ${CMAKE_CURRENT_SOURCE_DIR} ${_full_filepath})
    IF(NOT _relative_path MATCHES "^\\.\\./") # Has "../" at the beginning
      GET_FILENAME_COMPONENT(_relative_path ${_relative_path} PATH)
      STRING(REPLACE "/" "\\\\" _group_path "${_relative_path}")
      SOURCE_GROUP("Source\\${_group_path}" FILES ${_file})
    ELSE()
      # File is being generated in the binary directory
      SOURCE_GROUP("Generated" FILES ${_file})
    ENDIF()
  ENDFOREACH(_file)

ENDFUNCTION(GENERATE_SOURCE_GROUPS)