nvim_eval_statusline() can return the default statusline

[justinmk]

Problem

An old limitation of N/Vim is that the default internal logic for empty 'statusline' option, is not exposed as a 'statusline' expression. We added nvim_eval_statusline() which is very nice, but still can't use it to get the default statusline result.

Expected behavior

nvim_eval_statusline() should be able to yield the default statusline. It could look like any of :

• Passing empty string: nvim_eval_statusline('')
• or, a new opts flag: nvim_eval_statusline('',{default=true, ...})

[luukvbaal]

Worth noting that the help for 'statusline' does mention what supposedly yields the default statusline:

Emulate standard status line with 'ruler' set
set statusline=%<%f\ %h%m%r%=%-14.(%l,%c%V%)\ %P