Best way to trim whitespace from :pipe command output?

[michaeljones]

I've just discovered a great pairing between the pastel command and helix where you can select a hex colour code (like #8a6d3b in a css file) and run :pipe pastel format hsl to convert the selected colour to HSL syntax instead.

Unfortunately the pastel command prints the output on a new line so there is trailing new line character which means:

.alert-warning {
  color: #8a6d3b;
}

becomes:

.alert-warning {
  color: hsl(38, 40.1%, 38.6%)
;
}

What is the best way to address that? My first thought was to have some kind of :pipe-trim command that would trim whitespace from the output. I guess I could also set up my own executable on my path called pastel-trim which called pastel and removed the whitespace from the output. Or maybe there is some simple key sequence that'll handle it though I'd rather it was a seamless operation without addition clean up key strokes required.

I'm also curious how best to go about creating keyboard shortcuts for such that it might be possible to have a menu of formats to convert to. But I'm not sure that that is possible and I haven't explored yet.

[lukehsiao]

This isn't a helix-command, but you can just use general pipes to get what you want.

Some options that work for your example would be:

:pipe pastel format hsl | xargs echo -n 

or

:pipe pastel format hsl | tr -d '\n'  <-- this remove ALL newlines though, so this assumes only a single line output

[kirawi]

Or https://git-scm.com/docs/git-stripspace

[lukehsiao]

No, probably not. From the docs you linked:

add a missing \n to the last line if necessary.

This will create the awkward newline before the semi-colon that OP was wanting to get rid of.

Demo: