##

find_package(Doxygen QUIET)

if(DOXYGEN_FOUND)
  # click+jump in Emacs and Visual Studio (for doxy.config) (jw)
  if(CMAKE_BUILD_TOOL MATCHES "msdev|devenv")
    set(DOXY_WARN_FORMAT "\"$file($line) : $text \"")
  else()
    set(DOXY_WARN_FORMAT "\"$file:$line: $text \"")
  endif()

  set(DOXY_INPUT_DIR  ${CMAKE_CURRENT_SOURCE_DIR})
  set(DOXY_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR})
  
  # we need latex for doxygen because of the formulas
  #find_package(LATEX)
  #if(NOT LATEX_COMPILER)
  #  message(STATUS "latex command LATEX_COMPILER not found but usually required. You will probably get warnings and user inetraction on doxy run.")
  #endif(NOT LATEX_COMPILER)
  #if(NOT MAKEINDEX_COMPILER)
  #  message(STATUS "makeindex command MAKEINDEX_COMPILER not found but usually required.")
  #endif(NOT MAKEINDEX_COMPILER)
  #if(NOT DVIPS_CONVERTER)
  #  message(STATUS "dvips command DVIPS_CONVERTER not found but usually required.")
  #endif(NOT DVIPS_CONVERTER)
  
  if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/doxy.config.in)
    configure_file(${CMAKE_CURRENT_SOURCE_DIR}/doxy.config.in ${CMAKE_CURRENT_BINARY_DIR}/doxy.config @ONLY)
    # use (configured) doxy.config from (out of place) BUILD tree:
    set(DOXY_CONFIG ${CMAKE_CURRENT_BINARY_DIR}/doxy.config)
  else()
    message(STATUS "Warning: Could not find dox.config.in in the root directory.")
  endif()
  
  add_custom_target(doc ${DOXYGEN_EXECUTABLE} ${DOXY_CONFIG})
  
  # create a windows help .chm file using hhc.exe
  # HTMLHelp DLL must be in path!
  # fallback: use hhw.exe interactively
  if(WIN32)
    find_package(HTMLHelp)
    if(HTML_HELP_COMPILER)      
      set(TMP ${DOXY_OUTPUT_DIR}/html/index.hhp)
      string(REGEX REPLACE "/" "\\\\" HHP_FILE ${TMP})
      add_custom_target(chmdoc ${HTML_HELP_COMPILER} ${HHP_FILE})
      add_dependencies(chmdoc doc)
      # Adding a dependency somehow adds doc target as default build target
      set_target_properties(doc chmdoc PROPERTIES EXCLUDE_FROM_DEFAULT_BUILD TRUE)
    endif(HTML_HELP_COMPILER)
  endif(WIN32) 


  # Installation
  install(
    FILES ${DOXY_CONFIG} ${CMAKE_CURRENT_BINARY_DIR}/doxy.log
    DESTINATION ${PIXHAWK_DOC_INSTALL_PATH}/api
    OPTIONAL
  )
  # Install command always needs the directory to work
  if(NOT EXISTS ${CMAKE_CURRENT_BINARY_DIR}/html)
    file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/html)
  endif()
  install(
    DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/html
    DESTINATION ${PIXHAWK_DOC_INSTALL_PATH}/api
  )
endif(DOXYGEN_FOUND)