Added colors to file names and line+col numbers in clear-text reporter

[JoshuaKGoldberg]

Same cyan & yellow as TypeScript. It seems to work well there. Removes the extra lines of output as an opt-out behavior to make output more concise.

Starts on #975 (fancy emojis can come next!)

Before:

After:

[JoshuaKGoldberg]

I'm a little lost trying to get these unit tests to work with chalk 😕... if someone could help, I'd appreciate it! Debugged and realized I was off by one. Colored printing was fun.

[nicojs]

Hmm looks better I think. I'll have a look at the tests.

@simondel what do you think? It removes the names of the tests that ran, but do we really need them? It's a nice feature, but it also takes up a lot of space.

Maybe we can have 1 sentence:

Ran 3/24 tests for this mutant

Ran all tests for this mutant

EDIT:

Apparently it is configurable now? Very cool, let me check it out first :)

[JoshuaKGoldberg]

I also wonder if we really need the Mutant survived! complaint on top of each file. How about a 12/345 mutants survived! once before the list?

[nicojs]

It is a lot of repeated text. It would be awesome if could at a remark in front of the mutator:

1. [Survived] StringLiteral
/tmp/cmp/success.component.js:5:5
-    controllerAs: 'cpt'
+    controllerAs: ''
2. [No coverage] BinaryOperator
/tmp/cmp/success.component.js:10:5
-    1+1
+    1-1

I would just remove the Mutant survived! entirely. I'm pretty sure it is remnant from the original code base, when @simondel was still a student :). A blast from the past.

[JoshuaKGoldberg]

If you don't mind, I think we could also remove the Mutator: *Mutator message too. Doesn't seem too useful to end users, and we can generally figure it out from the change. Removed in the latest commit.

Edit: Just re-read and realized I'd misinterpreted your last comment, nicojs. I can make that change if you'd like! Will wait for input.

[simondel]

RIP Mutant Survived!
2015 - 2018

[nicojs]

If you don't mind, I think we could also remove the Mutator: *Mutator message too.

This is actually useful info. If you want to disable a mutator, you need to know the name.

[nicojs]

I'm thinking of adding a global option for allowColor. Instead of one specific for the clear text reporter. Might be useful for the log4js formatting as well. @JoshuaKGoldberg is it OK if I move it to a separate issue?

[nicojs]

How about this?

[JoshuaKGoldberg]

global option for allowColor

That sounds nice... though what if we want to have one reporter in color and another without? Would the allowColor set what the default is, as overridden by reporters?

I'll update this PR for the 105. [NoCoverage] Block, and if your separate issue / branch is different and this PR gets closed, I won't be offended in the slightest. 😊

[nicojs]

That sounds nice... though what if we want to have one reporter in color and another without?

What would that use case be? The only reason I see for disabling the colors is for build servers.

[nicojs]

@JoshuaKGoldberg I've created a separate issue for it. Could you explain it further there? #1218