Xo: Watch mode

[rafaeleyng]

Didn't find an option for that, and would be awesome.

[alcalyn]

I think its better to watch files changes with gulp, then use xo with gulp to check code style of changed files, no ?

[fregante]

I'm using onchange at the moment:

onchange '*.js' -i -- xo

[rafaeleyng]

@alcalyn It would work, but I was trying to use xo + ava exactly to avoid Gulp, so would be better without it.
@bfred-it It seems nice! Never heard of it, will take a look asap

Thanks

[jamestalmage]

I like this idea.

[vadimdemedes]

I started working on this in #157. I'd love everyone's feedback on the following. Here's how the current watch output looks:

Any ideas on how to beautifully separate reports between reruns here?

[vadimdemedes]

Maybe before each new report it could show "lib/controller.js changed", so that it's easily recognizable.

[fregante]

AVA has a smart watch mode, you could look at how it behaves. I think it clears the screen between runs.

[vadimdemedes]

As for smart watch mode, I considered doing something like AVA, but in XO we have way less complexity. That's why I went with simply re-running the check each time. Do you think it'd be better to just lint changed files?

I think it clears the screen between runs.

Might do that as well. @sindresorhus @jamestalmage do you think it's the way to go?

[sindresorhus]

Do you think it'd be better to just lint changed files?

XO already caches files, so this is handled for you.

[vadimdemedes]

XO already caches files, so this is handled for you.

I meant to show lint output only for changed files.