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---
title: "lolcat-c"
external_links:
- name: Sources
url: "https://git.jaseg.de/lolcat.git"
- name: Issues
url: "https://github.com/jaseg/lolcat/issues"
summary: >
lolcat-c is a small, high-performance re-implementation of the
`lolcat <https://github.com/busyloop/lolcat>`__
rainbow cat utility. lolcat-c is meant as a lolcat that you can actually use in production. It is fast, not slowing
down whatever you pipe through it, and it robustly handles real-world terminal output including escape sequences.
---
What?
=====
.. image:: LOLCat-Rainbow.jpg
Screenshot
==========
.. image:: screenshot.png
.. image:: sl.gif
Installation
============
Archlinux
---------
There's an `AUR package <https://aur.archlinux.org/packages/c-lolcat>`__:
.. code:: sh
$ git clone https://aur.archlinux.org/packages/c-lolcat
$ cd c-lolcat
$ makepkg -csi
Fedora
------
.. code:: sh
$ dnf install lolcat
Ubuntu (Snap)
-------------
See `this awesome blog post by a kind person from the internet <https://blog.simos.info/how-to-make-a-snap-package-for-lolcat-with-snapcraft-on-ubuntu/>`__:
.. code:: sh
$ snap install lolcat-c
Mac
---
Build loclcat with:
.. code:: sh
$ make lolcat
...and put the resulting binary at a place of your choice.
Others
------
.. code:: sh
$ make && sudo make install
Why?
====
This `lolcat` clone is an attempt to reduce the world's carbon dioxide emissions by optimizing inefficient code. It's
>10x as fast and <0.1% as large as the original one.
.. code:: sh
newton~/d/lolcat <3 dmesg>foo
newton~/d/lolcat <3 time upstream/bin/lolcat foo
13.51user 1.34system 0:15.99elapsed 92%CPU (0avgtext+0avgdata 10864maxresident)k
0inputs+0outputs (0major+1716minor)pagefaults 0swaps
newton~/d/lolcat <3 time ./lolcat foo
0.02user 0.00system 0:00.09elapsed 34%CPU (0avgtext+0avgdata 1936maxresident)k
0inputs+0outputs (0major+117minor)pagefaults 0swaps
Bonus comparison with `python-lolcat <https://github.com/tehmaze/lolcat/>`__:
.. code:: sh
newton~/d/lolcat <3 dmesg>foo
$ time python-lolcat foo
12.27user 0.00system 0:12.29elapsed 99%CPU (0avgtext+0avgdata 11484maxresident)k
0inputs+0outputs (0major+1627minor)pagefaults 0swaps
$ time c-lolcat foo
0.29user 0.00system 0:00.30elapsed 98%CPU (0avgtext+0avgdata 468maxresident)k
0inputs+0outputs (0major+21minor)pagefaults 0swaps
(Read: `c-lolcat << python-lolcat << ruby-lolcat`)
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