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I would like to find the git root directory and use it as argument for :FZF in a key mapping like this:
nnoremap <Leader>eg :FZF `git rev-parse --show-toplevel`<CR>
Unfortunately, this does not work. If I understand it right, backtick expansion works only when vim expects a filename. I think :FZF expects a folder name but maybe vim doesn't know this.
How can this be done?
You can use the system() function to run an external command and take its output (as you realized, per your own comments.)
Furthermore, you may also need trim() around it, to strip the whitespace (more specifically, the trailing newline at the end of the output from the command.)
You can then use :execute to assemble a call to the :FZF command, passing the git worktree root as an argument.
Putting it all together:
nnoremap <Leader>eg :execute 'FZF' trim(system('git rev-parse --show-toplevel'))<CR>
trim was missing and the error message didn't help me understanding this. Thanks a lot!
:help system()and consider experimenting with github.com/junegunn/fzf.vim#advanced-customization.nnoremap <Leader>eg :echo system(['git', 'rev-parse', '--show-toplevel'])<CR>works as expected.