diffC

	exec '/usr/bin/diff' \
	--unchanged-group-format='' \
	--old-group-format=\
'%c'\''\033'\''[1;97;40m|%c'\''\033'\''[91m*%c'\''\033'\''[97m| Line %dF%c'\''\033'\''[0;97;40m: missing %dn line%(n=1?:s):%c'\''\033'\''[m
%c'\''\033'\''[36m[[%c'\''\033'\''[31m
%<%c'\''\033'\''[36m]]
%c'\''\033'\''[37;40m(line %(n=1?%df:%df - %dl))%c'\''\033'\''[m

' \
	--new-group-format=\
'%c'\''\033'\''[1;97;40m|%c'\''\033'\''[92m*%c'\''\033'\''[97m| Line %dF%c'\''\033'\''[0;97;40m: additional %dN line%(N=1?:s):%c'\''\033'\''[m
%c'\''\033'\''[36m[[%c'\''\033'\''[32m
%>%c'\''\033'\''[36m]]%c'\''\033'\''[m

' \
	--changed-group-format=\
'%c'\''\033'\''[1;97;40m|%c'\''\033'\''[93m*%c'\''\033'\''[97m| Line %dF%c'\''\033'\''[0;97;40m: changed %dN line%(N=1?:s):%c'\''\033'\''[m
%c'\''\033'\''[36m[[%c'\''\033'\''[32m
%>%c'\''\033'\''[36m]]%c'\''\033'\''[m
, from:
%c'\''\033'\''[36m[[%c'\''\033'\''[31m
%<%c'\''\033'\''[36m]]
%c'\''\033'\''[37;40m(line %(n=1?%df:%df - %dl))%c'\''\033'\''[m

' \
	"$@";
#
# RegEx (Perl) matching all formatting codes above:
# [[
# %c'\\''\\033'\\''\[\d{0,3}(?:;\d{0,3})*m
# ]]
#