Implement :Gwq

doc/fugitive.txt

@@ -118,6 +118,13 @@ that are part of Git repositories).
                         :0:foo.txt or even :0 to write to just that stage in
                         the index.
 
+                                                *fugitive-:Gwq*
+:Gwq [path]             Like |:Gwrite| followed by |:quit| if the write
+                        succeeded.
+
+:Gwq! [path]            Like |:Gwrite|! followed by |:quit|! if the write
+                        succeeded.
+
                                                 *fugitive-:Gdiff*
 :Gdiff [revision]       Perform a |vimdiff| against the current file in the
                         given revision.  With no argument, the version in the

plugin/fugitive.vim

@@ -903,6 +903,8 @@ call s:command("-bar -bang -nargs=? -count -complete=customlist,s:EditComplete G
 " Gwrite, Gwq {{{1
 
 call s:command("-bar -bang -nargs=? -complete=customlist,s:EditComplete Gwrite :execute s:Write(<bang>0,<f-args>)")
+call s:command("-bar -bang -nargs=? -complete=customlist,s:EditComplete Gw :execute s:Write(<bang>0,<f-args>)")
+call s:command("-bar -bang -nargs=? -complete=customlist,s:EditComplete Gwq :execute s:Wq(<bang>0,<f-args>)")
 
 function! s:Write(force,...) abort
   if exists('b:fugitive_commit_arguments')
@@ -1022,6 +1024,19 @@ function! s:Write(force,...) abort
   return 'checktime'
 endfunction
 
+function! s:Wq(force,...) abort
+  let bang = a:force ? '!' : ''
+  if exists('b:fugitive_commit_arguments')
+    return 'wq'.bang
+  endif
+  let result = call(s:function('s:Write'),[a:force]+a:000)
+  if result =~# '^\%(write\|wq\|echoerr\)'
+    return s:sub(result,'^write','wq')
+  else
+    return result.'|quit'.bang
+  endif
+endfunction
+
 " }}}1
 " Gdiff {{{1