nav_file doesn't work with hidden files

[jaklan]

Hi, I wanted to use the convention known from mkdocs-awesome-pages plugin to put sub-navs into .pages files:

  - literate-nav:
      nav_file: .pages

Unforunately, it doesn't work. If I rename the file and the config to pages or pages.md - everything is okay, so it's clearly related to hidden files.

[oprypin]

References to relevant code:

mkdocs-literate-nav/mkdocs_literate_nav/plugin.py

Line 63 in 1b02eb7

file = files.get_file_from_path(os.path.join(path, nav_file_name))

https://github.com/mkdocs/mkdocs/blob/1779c181a32b62c89bdfbf888bf7e88a4fce58cf/mkdocs/structure/files.py#L30
https://github.com/mkdocs/mkdocs/blob/1779c181a32b62c89bdfbf888bf7e88a4fce58cf/mkdocs/structure/files.py#L230
https://github.com/mkdocs/mkdocs/blob/1779c181a32b62c89bdfbf888bf7e88a4fce58cf/mkdocs/structure/files.py#L253

Indeed, MkDocs excludes hidden files from the get-go, and mkdocs-literate-nav can't detect such files if it relies on that mechanism.

Thanks for the report. Maybe the implementation for finding the files can be changed.