From 534f6f57d46bec70a158564c5be6b40f1cd2bd06 Mon Sep 17 00:00:00 2001
From: Strahinja Val Markovic <val@markovic.io>
Date: Fri, 4 Oct 2013 10:30:58 -0700
Subject: [PATCH] Fix issue with slow cursor moving in Python

This happened when moving the cursor in normal mode. The problem was that we
were calling SyntasticCheck on every cursor move because YCM would think that
the FileReadyToParse event processing returned diagnostics... but YCM only
integrates with Syntastic for C-family files.

Fixed by only triggering SyntasticCheck in C-family files.
---
 autoload/youcompleteme.vim | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/autoload/youcompleteme.vim b/autoload/youcompleteme.vim
index b1554152..48cc8723 100644
--- a/autoload/youcompleteme.vim
+++ b/autoload/youcompleteme.vim
@@ -29,6 +29,14 @@ let s:cursor_moved = 0
 let s:moved_vertically_in_insert_mode = 0
 let s:previous_num_chars_on_current_line = -1
 
+let s:forced_syntastic_checker_for = {
+      \ 'cpp': 1,
+      \ 'c': 1,
+      \ 'objc': 1,
+      \ 'objcpp': 1,
+      \ }
+
+
 function! youcompleteme#Enable()
   " When vim is in diff mode, don't run
   if &diff
@@ -165,6 +173,12 @@ function! s:ForceSyntasticCFamilyChecker()
 endfunction
 
 
+function! s:ForcedAsSyntasticCheckerForCurrentFiletype()
+  return g:ycm_register_as_syntastic_checker &&
+         \ get( s:forced_syntastic_checker_for, &filetype, 0 )
+endfunction
+
+
 function! s:AllowedToCompleteInCurrentFile()
   if empty( &filetype ) || getbufvar(winbufnr(winnr()), "&buftype") ==# 'nofile'
     return 0
@@ -411,7 +425,7 @@ endfunction
 function! s:UpdateDiagnosticNotifications()
   let should_display_diagnostics =
         \ get( g:, 'loaded_syntastic_plugin', 0 ) &&
-        \ g:ycm_register_as_syntastic_checker &&
+        \ s:ForcedAsSyntasticCheckerForCurrentFiletype() &&
         \ pyeval( 'ycm_state.NativeFiletypeCompletionUsable()' )
 
   if !should_display_diagnostics