DarkflameServer/cmake/Utils.cmake

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# Parses a config file for a specific option and appends the new option if it does not exist
# If the new option does exist, this function will do nothing.
# file_name: The name of the file to parse
# old_option_name: The name of the option to find
# new_option_name: The name of the option to add
function(UpdateConfigOption file_name old_option_name new_option_name)
string(APPEND old_option_name "=")
string(APPEND new_option_name "=")
message(STATUS "Checking " ${file_name} " for " ${old_option_name} " and adding " ${new_option_name} " if it does not exist")
if(NOT EXISTS ${file_name})
message(STATUS ${file_name} " does not exist. Doing nothing")
return()
endif()
file(READ ${file_name} current_file_contents)
string(REPLACE "\\\n" "" current_file_contents ${current_file_contents})
string(REPLACE "\n" ";" current_file_contents ${current_file_contents})
set(parsed_current_file_contents "")
# Remove comment lines so they do not interfere with the variable parsing
foreach(line ${current_file_contents})
string(FIND ${line} "#" is_comment)
if(NOT ${is_comment} EQUAL 0)
string(APPEND parsed_current_file_contents ${line})
endif()
endforeach()
set(found_new_option -1)
set(found_old_option -1)
set(current_value -1)
foreach(line ${current_file_contents})
string(FIND ${line} ${old_option_name} old_option_in_file)
if(${old_option_in_file} EQUAL 0)
set(found_old_option 1)
set(current_value ${line})
endif()
string(FIND ${line} ${new_option_name} found_new_option_in_file)
if(${found_new_option_in_file} EQUAL 0)
set(found_new_option 1)
endif()
endforeach(line ${current_file_contents})
if(${found_old_option} EQUAL 1 AND NOT ${found_new_option} EQUAL 1)
string(REPLACE ${old_option_name} ${new_option_name} current_value ${current_value})
file(APPEND ${file_name} "\n" ${current_value})
endif()
endfunction()