POWERLINE_CUSTOM_CURRENT_PATH does nothing, because it then sets POWERLINE_CURRENT_PATH instead of POWERLINE_PATH
Feasibly, POWERLINE_CUSTOM_CURRENT_PATH could be renamed to POWERLINE_CUSTOM_PATH, or its behaviour could be directly rolled into the POWERLINE_PATH variable (by checking if it is unset before setting the default).
POWERLINE_CUSTOM_CURRENT_PATH does nothing, because it then sets POWERLINE_CURRENT_PATH instead of POWERLINE_PATH
Feasibly, POWERLINE_CUSTOM_CURRENT_PATH could be renamed to POWERLINE_CUSTOM_PATH, or its behaviour could be directly rolled into the POWERLINE_PATH variable (by checking if it is unset before setting the default).