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/usr/share/catkin/cmake/tools/doxygen.cmake is in catkin 0.7.4-4.

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#
# Copyright (c) 2011, Willow Garage, Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#     * Redistributions of source code must retain the above copyright
#       notice, this list of conditions and the following disclaimer.
#     * 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.
#     * Neither the name of the Willow Garage, Inc. nor the names of its
#       contributors may be used to endorse or promote products derived from
#       this software without specific prior written permission.
#
# 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 OWNER 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(<TARGET_NAME> <SEARCH_DIRS>)
# TARGET_NAME -> The cmake target to create.
# SEARCH_DIRS -> a CMake List of directories to search for doxygenated files.
#
find_program(DOXYGEN_EXECUTABLE doxygen)

if (DOXYGEN_EXECUTABLE)
  set(DOXYGEN_FOUND TRUE CACHE BOOL "Doxygen found")
endif()

if(NOT TARGET doxygen)
  add_custom_target(doxygen)
endif()

macro(catkin_doxygen TARGET_NAME SEARCH_DIRS)
  foreach(dir ${SEARCH_DIRS})
    file(GLOB_RECURSE _doc_sources ${dir}/*)
    list(APPEND doc_sources ${_doc_sources})
  endforeach()

  string(REPLACE ";" " " doc_sources "${doc_sources}")

  configure_file(${catkin_EXTRAS_DIR}/templates/Doxyfile.in ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile @ONLY)

  add_custom_target(${TARGET_NAME}
    COMMENT "Generating API documentation with Doxygen" VERBATIM
    )

  add_custom_command(TARGET ${TARGET_NAME}
    COMMAND ${DOXYGEN_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile
    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
    )
  add_dependencies(doxygen ${TARGET_NAME})

endmacro()