Make file name matcher check on base name of entry

[ainopara]

I am writing a textbundle plugin for jekyll. I found that If a folder in _posts named 2018-06-09-Test.textbundle, which can pass the matcher check, all files in the folder will pass the check no matter what name they have.

That means all the png images in textbundle will tried to be read by Jekyll and we will see an error message for them. textbundle format also contains a json file which is not used by Jekyll but recognized as a Jekyll::Document.

I know having a folder in _posts folder and it’s name happened to pass the file name checker is not common, but file name checker is supposed to check a file’s name rather than it’s location. So I think it will be nice to fix it.

[ashmaroli]

@ainopara Will you be able to write some tests for this..?

[kenman345]

@ainopara This looks pretty solid to me. Can you show me the issue you're having in a repository so I can mock that up for tests to help you along?

[ainopara]

@kenman345 Thank you for helping me to write tests for this change. It's beyond my ability to write tests for this method on my own.
Is https://github.com/ainopara/BugReportDemo/tree/jekyll/issue-7067 sufficient for this case?