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spark is dope. it would be cool to be able to specify the number of rows/lines to use for taller graphs.

This PR implements a Nix [flake](https://nixos.wiki/wiki/Flakes) to easily run and use `spark` on Nix enabled systems.

This allows support for spark to print plots on multiple rows, triggered with the `-r/--rows` option.

I have a sequence of numbers, which includes some negative numbers, but spark doesn't handle them correctly: ``` $ echo 5 0 10 -20 | spark ▆▅█▁ ``` I'm not...

Hi, I created [Awesome package manager](https://github.com/shinokada/awesome) and I can install your repo using it. After installing the Awesome: ``` awesome -i holman/spark ``` If you can put it in your...

`spark 7 4 5 3 8 6 9 2 7 4` is working fine but `echo 7 4 5 3 8 6 9 2 7 4 | spark` is not...

a='▂▄▆█'; s=$(iwconfig wlp61s0 | sed -E-n 's/[^0-9]*=([0-9]\{1,\})\/70.*$/\1/p') ; : ${s:='-18'}; echo ${a:0:$(( ( $s / 18 ) + 1 ))} call to spark is useless and code is unsightly (even...

spark 20125 19562 20250 20125 19562 19437 20062 20062 20125 20187 show me : ▆▂█▆▂▁▆▆▆▇ This value are really higher from zero. Would it be possible to avoid that all...

Inspiration and Attribution: Shout out to Alexandre Pretto Nunes (https://github.com/apretto)! Alexandre's PR (https://github.com/holman/spark/pull/88/commits/206a69d8d076cfaa4114eb6f9fc30e90445a3442) with the "fire" palette was the inspiration behind these features. Much thanks! Additional shout out to user79743...

Data `0 1 19 20` should print ▁▁██ but prints ▁▁▇█ The problem is the number 7 in your character index calculation. A working formula for the index is `int(...