Support lib selection

Author: othree_kao

plugin/jslsyntax.vim

@@ -1,19 +1,33 @@
 " Vim plugin file
 " Language:    JS Lib syntax loader
 " Maintainer:  othree <othree@gmail.com>
-" Last Change: 2013/02/06
-" Version:     0.1
+" Last Change: 2013/02/20
+" Version:     0.2
 " URL:         https://github.com/othree/javascript-libraries-syntax.vim
 
 autocmd FileType javascript call LoadLibs(expand('<sfile>:p:h'))
 autocmd FileType coffee call LoadLibs(expand('<sfile>:p:h'))
 autocmd FileType ls call LoadLibs(expand('<sfile>:p:h'))
 
 function! LoadLibs(path)
-    exe('source '.a:path.'/syntax/jquery.vim')
-    exe('source '.a:path.'/syntax/underscore.vim')
-    exe('source '.a:path.'/syntax/backbone.vim')
-    exe('source '.a:path.'/syntax/prelude.vim')
-    exe('source '.a:path.'/syntax/postprocess.vim')
+  if exists('b:javascript_libraries_syntax')
+    return
+  endif
+  let b:javascript_libraries_syntax = 1
+
+  let libs = ['jquery', 'underscore', 'backbone', 'prelude']
+  if !exists('g:used_javascript_libs') 
+    let g:used_javascript_libs = join(libs, ',')
+  endif
+
+  let index = 0
+  while index < len(libs)
+    let lib = libs[index]
+    if g:used_javascript_libs =~ lib
+      exe('source '.a:path.'/syntax/'.lib.'.vim')
+    endif
+    let index = index + 1
+  endwhile
+  exe('source '.a:path.'/syntax/postprocess.vim')
 endfunction