How to get a variable with the contents of a file on the filesystem?

Question

I intend to use this to optionally share the search buffer between different Vim instances. I'll have a file on the filesystem that contains the content. So it means I need to set the search register with the contents of a file.

I'm hoping there's a clean Vimscript way to do this. It's ok if it uses python or any other language integration too.

I think this is how to edit the register: let @/ = [whatever]

Answer 1

This was easy.

nnoremap <silent> <Leader>n :let @/ = join(readfile(glob("~/.vim/.search")), "\n")<CR>