Allow static checks to be run against an arbitrary path

[davidperezgar]

What we need for the submission form from wordpress.org is run static checks in an arbitrary path. It's helpful as well for any developer user to directly run static checks in any directory.

Resolves #478

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Co-authored-by: ernilambar <rabmalin@git.wordpress.org>
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[swissspidy]

I'm out of office until Monday but happy to review then.

At first glance I'd say the is_dir logic is at the wrong level. If you pull it higher up, then you don't to worry about naming or anything. For example doing that in Abstract_Check_Runner::get_plugin_basename would be better. No need to touch get_plugin_basename_from_input() at all.

Also, this would be an excellent candidate to write Behat tests for.

Happy to help with both once I'm back.

[ernilambar]

I tested PR and it is not working for plugin in external location as expected. Few checks are working though.

In Plugin_Context there is protected $main_file; which is used in several checks. This expects the main file of the plugin but in external plugin, this variable just has plugin path. So there are few errors in the output.

Like in Plugin_Header_Text_Domain_Check, there is like this:

$plugin_main_file = WP_PLUGIN_DIR . '/' . $result->plugin()->basename();

May be we should fix $main_file in the beginning and access same property in all checks rather than evaluating main file like above.

[davidperezgar]

Thanks @ernilambar for your feedback. I've detected that problem, and I've committed a fix. Update the PR and it should work.