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# - Find lex executable
#

INCLUDE(FindCygwin)

FIND_PROGRAM(LEX_EXECUTABLE
  NAMES
    flex
    lex
  PATHS
    ${CYGWIN_INSTALL_PATH}/bin
    /bin
    /usr/bin
    /usr/local/bin
    /sbin
)

MARK_AS_ADVANCED(LEX_EXECUTABLE)

# flex a .l file

# search flex
MACRO(FIND_LEX)
  IF(NOT LEX_EXECUTABLE)
    FIND_PROGRAM(LEX_EXECUTABLE flex)
    IF (NOT LEX_EXECUTABLE)
      MESSAGE(FATAL_ERROR "flex not found - aborting")
    ENDIF (NOT LEX_EXECUTABLE)
  ENDIF(NOT LEX_EXECUTABLE)
ENDMACRO(FIND_LEX)

MACRO(ADD_LEX_FILES _sources )
  FIND_LEX()

    FOREACH (_current_FILE ${ARGN})
      GET_FILENAME_COMPONENT(_in ${_current_FILE} ABSOLUTE)
      GET_FILENAME_COMPONENT(_basename ${_current_FILE} NAME_WE)

      SET(_outc ${CMAKE_CURRENT_BINARY_DIR}/${_basename}.c)
      SET(_outh ${CMAKE_CURRENT_BINARY_DIR}/${_basename}_lex.h)

      ADD_CUSTOM_COMMAND(
        OUTPUT ${_outc}
#       COMMAND ${LEX_EXECUTABLE}
        COMMAND ${CMAKE_SOURCE_DIR}/tools/runlex.sh ${LEX_EXECUTABLE}
        ARGS
        -o${_outc}
        --header-file=${_outh}
        ${_in}
        DEPENDS ${_in}
      )

    SET(${_sources} ${${_sources}} ${_outc} )
  ENDFOREACH (_current_FILE)
ENDMACRO(ADD_LEX_FILES)