This is a simple module that exports a Through2 compatible transform.
It's extremely specific. I built it for Nand2Tetris to help with writing out bus outputs. Given input that looks like
Whatver [0] whatver[0]
Whatver [0] whatver[0]
Whatver [0] whatver[0]
Whatver [0] whatver[0]
Whatver [0] whatver[0]
Run it like so:
$ npm install -g uptick
$ pbcopy | uptick | pbcopy
It produces output that looks like this:
Whatver [0] whatver[0]
Whatver [1] whatver[1]
Whatver [2] whatver[2]
Whatver [3] whatver[3]
Whatver [4] whatver[4]