Fixes pluginSearchDirs w/ getFileInfo

[arcanis]

This plugin wasn't properly forwarding the pluginSearchDirs option to Prettier, causing unexpected issues in some cases. This diff simply makes sure that the options are merged with the rc settings that are read right before.

[BPScott]

Thanks @arcanis,

I think this should also include any options added within the eslint config - the eslintPrettierOptions object, can update your Object.assign to be:

Object.assign(
  { ignorePath: '.prettierignore' },
  prettierRcOptions,
  eslintPrettierOptions
)

Would it be possible to add a test for this as well?

[BPScott]

Taking a deeper look into this, I don't think this code is correct.

The options that prettier.getFileInfo accepts are not the options that prettier.format accepts, so it doesn't make sense to merge the options that we pass to format into getFileInfo. (Annoyingly the docs are slightly out of date and don't mention the plugins option: https://github.com/prettier/prettier/blob/3fcf69a7d561a22314c9644b4e309907310db266/src/common/get-file-info.js#L8)

I've just merged #187 allows you to pass arbitrary options to getFileInfo. If you need to pass extra options into getFileInfo then you should use that.

[BPScott]

It looks like getFileInfo doesn't ever use pluginSearchDirs (per https://github.com/prettier/prettier/blob/3fcf69a7d561a22314c9644b4e309907310db266/src/common/get-file-info.js) so if you need that you'll have to raise an issue in prettier itself.