feat: Fail on fix (#52)

[josejulio]

The purpose of this is to have something that aborts commits in case any file is fixed.

I added a flag to maintain backwards compatibility, so only users who pass the --fail-on-fix will have this behavior.

[aleclarson]

Good work! I vote for the name being --bail like Jest does it.

Please remove the object being passed to mri. We don't use that for any of the other flags.

So this can implemented as a one-liner:

 onWriteFile: file => {
   console.log(`✍️  Fixing up ${chalk.bold(file)}.`);
+  if (args.bail) success = false;
 }

[josejulio]

Thanks for the name suggestion, i was looking for something short to avoid the mri flags :)

[aleclarson]

Change to this please:

## `--bail`

Prevent `git commit` if any files are fixed.

[josejulio]

@aleclarson done

[azz]

We need a different error message when bailing, the current one is

Partially staged files were fixed up

Which is not correct in this case.

Could you also add a test?

[josejulio]

We need a different error message when bailing, the current one is

Partially staged files were fixed up

Which is not correct in this case.

Could you also add a test?

Sure, will attempt to add it next week, thanks!

[jantimon]

Added unit tests to #60

[josejulio]

Thanks @jantimon !