How to pipe colored output to vim and show it correctly?

Hi

I have the following alias which works fine when uncolored input.

~/linux/test/gnu/ack-grep/--color$ alias less
alias less='vim -R -'

~/linux/test/gnu/ack-grep/--color$ cat.sh *.txt
==> test1.txt <==
ABC

==> test2.txt <==
AXY
~/linux/test/gnu/ack-grep/--color$ printf "%s\n" *.txt|ack --color -x A
test1.txt
1:ABC

test2.txt
1:AXY

But when the input is colored,
~/linux/test/gnu/ack-grep/--color$ printf "%s\n" *.txt|ack --color -x A|less

I see the following in vim. Does anybody know how to make the correct
alias of less that it works for both colored cases and uncolored
cases? Thanks.

1 ^[[1;32mtest1.txt^[[0m:^[[1;33m1^[[0m:^[[30;43mA^[[0mBC^[[0m^[[K
2 ^[[1;32mtest2.txt^[[0m:^[[1;33m1^[[0m:^[[30;43mA^[[0mXY^[[0m^[[K

--
Regards,
Peng

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