add filemask action for live_grep picker

[antosha417]

When I use live_grep in a huge repo sometimes there are too many results to scroll through. This is when filemask filters like some/path/*/*.{lua,vim} come in handy.
The only problem is that I can see that there are too many results only after I typed a search query. So I need to close live_grep, open it again with a right filemask and then retype my query.
I want to be able to call filemask_filter action to filter out results I don't need in live_grep

[antosha417]

I also have an idea to be able to filter out results by file type. rg have builtin file types that can be passed to telescope. But I couldn't figure out a proper way to save prompt content for live_grep when another telescope picker is opened

[Conni2461]

Not sure if we want this action in core. Could just be a wiki entry somewhere here: https://github.com/nvim-telescope/telescope.nvim/wiki/Configuration-Recipes

[aidos]

Thanks @antosha417 for the idea on how to do this. I've been looking myself for a way to better control rg. I was wondering if it made sense to allow live_grep to parse the command as arguments instead of as the search text (say if the prompt begins with --).

So then we could just use --type python -- my search here (or any other rg flags we wanted)

[aidos]

Ah ha, just found this PR and this offshoot extension which is exactly the idea I was looking for above. Will point my attention that way instead.

[Conni2461]

https://github.com/nvim-telescope/telescope-rg.nvim is a good solution that does this in the prompt.

Closing this as this can be done from user side