Allow CLI to read the CSS from stdin

[mhhollomon]

I would like for there to be a way that the purgecss CLI could read the CSS from stdin.

I would like to be able to do something like:

tailwind build site/mystyles.css | purgecss --css - -c purgeccs.config.js -o build/mystyles.css

Maybe there is a way to do this, but I couldn't see it after looking at the code.

My other two options are

1. use a temp file in the middle
2. write my own wrapper for purgecss.

[mhhollomon]

If it helps anyone else, I created purgecss_stdin as a (very) simple wrapper around the API to read CSS from stdin. It can write to either stdout or to a file.

[Ffloriel]

Thanks, could be useful. I'll look into the PR this week and if we could include the purgecss_stdin option to the CLI.

[mhhollomon]

I'll be happy to create a PR for this issue as well, but wanted to build it on top of the other one.

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