Goyo is configured to toggle with <Leader><Space>, and to set its width

using either the filetype's textwidth value, or if none is set either 78
columns or the widest line if any are longer than that.

vim/config/keyboard.vim

@@ -29,6 +29,7 @@
 "   <Ctrl-_>p               | (A) -> comment the current paragraph
 "   +                       | (V) -> increase the selected region
 "   _                       | (V) -> decrease the selected region
+"   <Leader><Space>         | (N) -> center content and hide everything else
 "
 "  (surround)
 "    S"                     | (V) -> surround selection with quotes

vim/config/plugins.vim

@@ -30,6 +30,18 @@
     endif
 "}}}
 
+"GOYO: {{{
+    nnoremap <Leader><Space> :Goyo<CR>
+    autocmd VimEnter,Filetype *
+        \   let g:goyo_width = &textwidth |
+        \   if (g:goyo_width == 0) |
+        \       let g:goyo_width = max(map(getline(1,'$'), 'len(v:val)')) |
+        \       if (g:goyo_width < 78) |
+        \           let g:goyo_width = 78 |
+        \       endif |
+        \   endif
+"}}}
+
 "GUNDO: {{{
     let g:gundo_right=1
     let g:gundo_width=35