Feature idea: include additional file search paths that are normally ignored by git / ripgrep

[gitaarik]

Hi there! I often work in projects where I need to edit files that are ignored by git or ripgrep, thus don't show up in fzf-preview. So for me it would be handy if they would show up.

I noticed you can configure your own file list commands with:

" Commands used to get the file list from project
let g:fzf_preview_filelist_command = 'custom_command'

" Commands used to get the file list from git repository
let g:fzf_preview_git_files_command = 'custom_command'

" Commands used to get the file list from current directory
let g:fzf_preview_directory_files_command = 'custom_command'

That's really nice. So I made a little zsh script that searches a project with additional paths configured in a .fzf_preview_include file. See my Gist here: https://gist.github.com/gitaarik/bc7c6724a1868f8d89f5a97f794f14f2

I think this might be a nice feature to have included in fzf-preview. I guess however that a zsh script is maybe not appropriate. I'm not so familiar with vim plugin development. In any case, I think it would be very useful, because it has been frustrating me sometimes that some paths don't show up in fzf-preview. It could also maybe be included in the readme in section "Requirements -> Optional".

Edit: I would also like to use this command for non-project directories. These vim config variables that you can set only influence the project directory commands like :FzfPreviewProjectFilesRpc. So it does not work for :FzfPreviewDirectoryFiles.

Also, there doesn't seem to be a MRU variation of the :FzfPreviewDirectoryFiles command. Which would also be really helpful. Why is there only MRU for project (git) dirs (FzfPreviewProjectMruFiles) and not for regular directories?