# Locate and setup doxygen

# This module defines
# DOXYGEN_EXECUTABLE the path to the doxygen executable
# MACRO ADD_DOXYGEN_TARGET()
#  target is the name of the project the doxyfile is for
#  input is the doxyfile to preprocess wiuth CONFIGURE_FILE
#  output is the output name for the doxyfile
#  a new make target 'doxygen_<TARGET>' with TARGET is the target name given

FIND_PROGRAM(DOXYGEN_EXECUTABLE doxygen)

MACRO(ADD_DOXYGEN_TARGET target input output infile outdir)
  IF(DOXYGEN_EXECUTABLE-NOTFOUND)
    MESSAGE(STATUS "Doxygen executable not found - can't create doxygen documentation")
  ELSE(DOXYGEN_EXECUTABLE-NOTFOUND)
    CONFIGURE_FILE(${input} ${output})
    ADD_CUSTOM_TARGET(doxygen_${target} doxygen ${output}
      COMMAND ${CMAKE_COMMAND} -E copy_if_different ${infile} ${outdir}
    )
  ENDIF(DOXYGEN_EXECUTABLE-NOTFOUND)
ENDMACRO(ADD_DOXYGEN_TARGET target)