Use the built-in ESLint reporter (Stylish)

[kasperisager]

This PR refactors Standard to report errors using the built-in reporter in ESLint.

Before:

After:

[jprichardson]

Not sure what @feross thinks about this PR, but presumably that's why he built snazzy.

[Flet]

Unfortunately, I don't think this will get merged...

"... the output format of standard is locked – it will never change"
#142 (comment)

And:

"I would prefer to solve this outside of standard core, since it's not an essential feature.
I published a new package snazzy that does just what you need: it transforms "compact" output to "stylish"."
#202

I definitely recommend checking out snazzy!

[kasperisager]

Snazzy it is then!

[feross]

I'm afraid this change will break the editor tools that rely on the current output format on stdout.

We could try to detect if standard is running in a TTY (with process.stdin.isTTY) and use the stylish formatting in that case, falling back to the current formatting in scripts and when using unix pipes, but this method is not foolproof.

[LinusU]

I would love to see some nicer output from standard, but I don't think that the extra effort (although small) of using snazzy outweighs that need.

I'm +1 on this getting merged thought, maybe with isTTY. But somehow I think that we have kind of the worst of two worlds currently. It's not very human readable and it's not very machine readable. I don't know, just my two cents...

[jprichardson]

It's best to just keep it the same. You can never predict how consumers of your software will use it. isTTY feels like a "non-pure" hack. Mocha uses this and it forced me to do some nasty things in electron-mocha... but that's because they probably didn't anticipate a Node environment that's DOM-enabled.

[feross]

Thanks for the PR, but we don't need this feature in core.

There are many of modules that style the output - it's not that hard to parse. The built-in reporter works just fine, but there's also snazzy, standard-json, and standard-tap for specific styles. Also standard-reporter supports a bunch more.