From 8d37201ed29a4149ff87b17e7ade209a0981986a Mon Sep 17 00:00:00 2001
From: "Justin M. Keyes" <justinkz@gmail.com>
Date: Sun, 10 Apr 2016 02:20:53 -0400
Subject: [PATCH] spell: Fix argument and avoid redundant prompt.

In #3027 we deferred the "missing spell file" prompt until VimEnter, but
we were sending the wrong argument (should be "en", not "en_us").
This also caused redundant prompts if user answers "No" to the download
prompt invoked by the SpellFileMissing event.

Closes #3966
Closes #4406
---
 runtime/plugin/spellfile.vim |  7 -------
 src/nvim/spell.c             | 13 ++++++++-----
 2 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/runtime/plugin/spellfile.vim b/runtime/plugin/spellfile.vim
index 437296090c..e03659d6d6 100644
--- a/runtime/plugin/spellfile.vim
+++ b/runtime/plugin/spellfile.vim
@@ -1,15 +1,8 @@
 " Vim plugin for downloading spell files
-" Maintainer:  Bram Moolenaar <Bram@vim.org>
-" Last Change: 2006 Feb 01
 
-" Exit quickly when:
-" - this plugin was already loaded
-" - when 'compatible' is set
-" - some autocommands are already taking care of spell files
 if exists("loaded_spellfile_plugin") || &cp || exists("#SpellFileMissing")
   finish
 endif
 let loaded_spellfile_plugin = 1
 
-" The function is in the autoload directory.
 autocmd SpellFileMissing * call spellfile#LoadFile(expand('<amatch>'))
diff --git a/src/nvim/spell.c b/src/nvim/spell.c
index cc7dc6210c..fdae89b84c 100644
--- a/src/nvim/spell.c
+++ b/src/nvim/spell.c
@@ -2332,14 +2332,17 @@ static void spell_load_lang(char_u *lang)
 
   if (r == FAIL) {
     if (starting) {
-      // Some startup file sets &spell, but the necessary files don't exist:
-      // try to prompt the user at VimEnter. Also set spell again. #3027
-      do_cmdline_cmd(
-        "autocmd VimEnter * call spellfile#LoadFile(&spelllang)|set spell");
+      // Prompt the user at VimEnter if spell files are missing. #3027
+      // Plugins aren't loaded yet, so spellfile.vim cannot handle this case.
+      char autocmd_buf[128] = { 0 };
+      snprintf(autocmd_buf, sizeof(autocmd_buf),
+               "autocmd VimEnter * call spellfile#LoadFile('%s')|set spell",
+               lang);
+      do_cmdline_cmd(autocmd_buf);
     } else {
       smsg(
         _("Warning: Cannot find word list \"%s.%s.spl\" or \"%s.ascii.spl\""),
-	    lang, spell_enc(), lang);
+        lang, spell_enc(), lang);
     }
   } else if (sl.sl_slang != NULL) {
     // At least one file was loaded, now load ALL the additions.