Ag w/o argument

Examples-(vim).md

@@ -118,6 +118,7 @@ command! FZFLines call fzf#run({
 
 - `CTRL-X`, `CTRL-V`, `CTRL-T` to open in a new split, vertical split, tab respectively.
 - `CTRL-A` to select all matches and list them in quickfix window
+- `Ag` without argument will list all the lines
 
 ```vim
 function! s:ag_to_qf(line)
@@ -146,8 +147,9 @@ function! s:ag_handler(lines)
   endif
 endfunction
 
-command! -nargs=1 Ag call fzf#run({
-\ 'source':  'ag --nogroup --column --color "'.escape(<q-args>, '"\').'"',
+command! -nargs=* Ag call fzf#run({
+\ 'source':  printf('ag --nogroup --column --color "%s"',
+\                   escape(empty(<q-args>) ? '^' : <q-args>, '"\')),
 \ 'sink*':    function('<sid>ag_handler'),
 \ 'options': '--ansi --expect=ctrl-t,ctrl-v,ctrl-x '.
 \            '--multi --bind ctrl-a:select-all --color hl:68,hl+:110',