nvim: init.vim: Use floating window for FZF

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

nvim/init.vim

@@ -611,3 +611,24 @@ endfunction
 function! NvimGdbNoTKeymaps()
   tnoremap <silent> <buffer> <Esc> <C-\><C-n>
 endfunction
+
+let $FZF_DEFAULT_OPTS='--layout=reverse'
+let g:fzf_layout = { 'window': 'call FloatingFZF()' }
+function! FloatingFZF()
+    let buf = nvim_create_buf(v:false, v:true)
+    let height = float2nr(&lines * 0.4)
+    let width = float2nr(&columns * 0.8)
+    let horizontal = float2nr((&columns - width) / 2)
+    let vertical = float2nr((&columns - width) / 2)
+
+    let opts = {
+        \ 'relative': 'editor',
+        \ 'row': vertical,
+        \ 'col': horizontal,
+        \ 'width': width,
+        \ 'height': height
+        \ }
+
+    " open the new window, floating, and enter to it
+    call nvim_open_win(buf, v:true, opts)
+endfunction