From 49b6012f98eda8f0e907acfebe8321313313e1fa Mon Sep 17 00:00:00 2001
From: Martin Grenfell <martin.grenfell@gmail.com>
Date: Sat, 13 Apr 2013 17:19:24 +0100
Subject: [PATCH] add basic deprecation warning system

---
 autoload/syntastic/util.vim   | 10 ++++++++++
 plugin/syntastic/registry.vim |  2 +-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/autoload/syntastic/util.vim b/autoload/syntastic/util.vim
index 86f7df6d..2fafc782 100644
--- a/autoload/syntastic/util.vim
+++ b/autoload/syntastic/util.vim
@@ -130,6 +130,16 @@ function! syntastic#util#unique(list)
     return keys(seen)
 endfunction
 
+let s:deprecationNoticesIssued = []
+function! syntastic#util#deprecationWarn(msg)
+    if index(s:deprecationNoticesIssued, a:msg) >= 0
+        return
+    endif
+
+    call add(s:deprecationNoticesIssued, a:msg)
+    echomsg "syntastic: warning: " . a:msg
+endfunction
+
 let &cpo = s:save_cpo
 unlet s:save_cpo
 " vim: set et sts=4 sw=4:
diff --git a/plugin/syntastic/registry.vim b/plugin/syntastic/registry.vim
index 8a1bd25c..ad3ef2c5 100644
--- a/plugin/syntastic/registry.vim
+++ b/plugin/syntastic/registry.vim
@@ -141,7 +141,7 @@ endfunction
 function! g:SyntasticRegistry._userHasFiletypeSettings(filetype)
     if exists("g:syntastic_" . a:filetype . "_checker") && !exists("g:syntastic_" . a:filetype . "_checkers")
         let g:syntastic_{a:filetype}_checkers = [g:syntastic_{a:filetype}_checker]
-        echomsg "syntastic: warning: variable g:syntastic_" . a:filetype . "_checker is deprecated"
+        call syntastic#util#deprecationWarn("variable g:syntastic_" . a:filetype . "_checker is deprecated")
     endif
     return exists("b:syntastic_checkers") || exists("g:syntastic_" . a:filetype . "_checkers")
 endfunction