# Copyright (c) 2014-2015, Siemens AG. All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# 
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# 
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

## DOXYGEN DOCUMENTATION
#
#  Is only generated when option(.* ON) is set...
function (CreateDoxygenDocumentationTarget)
  option(BUILD_DOCUMENTATION "Use Doxygen to create the HTML based API documentation" ON)
  if(BUILD_DOCUMENTATION)
    FIND_PACKAGE(Doxygen)
    #if (NOT DOXYGEN_FOUND)
    #  message(FATAL_ERROR
    #    "Doxygen is needed to build the documentation. Please install it correctly")
    #endif()
    #-- Configure the Template Doxyfile for our specific project
    configure_file(doc/reference/Doxyfile.in
                   ${PROJECT_BINARY_DIR}/Doxyfile  @ONLY IMMEDIATE)
    #-- Add a custom target to run Doxygen when ever the project is built
    if (TARGET doxygen)
      # Do nothing, since the repeated adding causes an error
    else()
      set(DOXYGEN_TEMPLATE_FILES
      "doc/reference/header.html")

      file(COPY ${DOXYGEN_TEMPLATE_FILES} DESTINATION ${PROJECT_BINARY_DIR})

      add_custom_target (
        doxygen 
        #ALL
        COMMAND ${DOXYGEN_EXECUTABLE} ${PROJECT_BINARY_DIR}/Doxyfile
        SOURCES ${PROJECT_BINARY_DIR}/Doxyfile)
        # IF you do NOT want the documentation to be generated EVERY time you build the project
        # then leave out the 'ALL' keyword from the above command.
    endif()
  endif()
endfunction()
