i try to modify no. 106 line to do this
local std_line="${colour}${date} [${upper}] ${line}${norm}";
add linenumber
local std_line="${colour}${date} [${upper}] ${BASH_LINENO}: \t${line}${norm}";
and 79 line
local file_line="${date} [${upper}] ${BASH_LINENO}:\t${line}";
then i success.
maybe merge in the repo.
\t to align