Pipelining text with ANSI color code to bat consumes huge CPU and memory. #1481
Description
What version of bat are you using?
bat 0.17.1
Describe the bug you encountered:
I was working on the nginx source tree: http://nginx.org/download/nginx-1.19.6.tar.gz
grep -rniI 'u_char' --color=always | batless will open but scrolling to end (G) takes 8 seconds for a 2500 lines grep result. top report that less consumed a whole CPU core and 960 MiB physical memory (RES) during that 8 seconds.
grep -rniI 'u_char' --color=never | bat works fine.
grep -rniI 'u_char' --color=always | less -RN works fine.
What did you expect to happen instead?
Performance should be equivalent to grep -rniI 'u_char' --color=always | less -RN.
How did you install bat?
Archlinux pacman.
Evironment
system
$ uname -srm
Linux 5.9.14-arch1-1 x86_64
bat
$ bat --version
bat 0.17.1
$ env
bat_config
bat_wrapper
No wrapper script for 'bat'.
bat_wrapper_function
No wrapper function for 'bat'.
No wrapper function for 'cat'.
tool
$ less --version
less 563 (PCRE regular expressions)