# - Get the current date from the system
# This file defines the macro TODAY that can be used to
# retrive the current date.
#
# This is the definition of the macro
#  macro TODAY(result)
#
# After retriving the current date, it set the variable ${result}
# in the format YYYYMMDD. In addition the following variables
# are also set:
#  ${result}_YEAR to YYYY
#  ${result}_MONTH to MM
#  ${result}_DAY to DD
#
# Example:
#  include(Today)
#  today(CURRENT_DATE)
#  message(STATUS "${CURRENT_DATE_YEAR}-${CURRENT_DATE_MONTH}-${CURRENT_DATE_DAY}")
# will print YYYY-MM-DD.
#

macro(TODAY RESULT)
    if(WIN32)
        execute_process(COMMAND "cmd" "/C date /T" OUTPUT_VARIABLE ${RESULT})
    elseif(UNIX)
        execute_process(COMMAND "date" "+%d/%m/%Y" OUTPUT_VARIABLE ${RESULT})
    else()
        message(WARNING "Cannot get the current date, continue with date equal to '00000000'")
        set(${RESULT} 00000000)
    endif()
    
    string(REGEX REPLACE "([0-9][0-9])/([0-9][0-9])/([0-9][0-9][0-9][0-9]).*" "\\3\\2\\1" ${RESULT} ${${RESULT}})
    string(REGEX REPLACE "([0-9][0-9][0-9][0-9])[0-9][0-9][0-9][0-9]" "\\1" ${RESULT}_YEAR ${${RESULT}})
    string(REGEX REPLACE "[0-9][0-9][0-9][0-9]([0-9][0-9])[0-9][0-9]" "\\1" ${RESULT}_MONTH ${${RESULT}})
    string(REGEX REPLACE "[0-9][0-9][0-9][0-9][0-9][0-9]([0-9][0-9])" "\\1" ${RESULT}_DAY ${${RESULT}})
endmacro(TODAY)