Now reparsing clang files on buffer enter

This creates an auto PCH that speeds up code completion.

autoload/youcompleteme.vim

@@ -75,6 +75,10 @@ endfunction
 function! s:OnBufferVisit()
   call s:SetCompleteFunc()
   py identcomp.OnFileEnter()
+
+  if pyeval('ycm.ClangAvailableForFile()')
+    py clangcomp.OnFileEnter()
+  endif
 endfunction
 
 

python/ycm.py

@@ -123,19 +123,8 @@ class ClangCompleter( Completer ):
     self.filename_holder = []
 
 
-  def CandidatesForQueryAsync( self, query ):
-    # TODO: sanitize query
+  def GetUnsavedFilesVector( self ):
     files = indexer.UnsavedFileVec()
-
-    # CAREFUL HERE! For UnsavedFile filename and contents we are referring
-    # directly to Python-allocated and -managed memory since we are accepting
-    # pointers to data members of python objects. We need to ensure that those
-    # objects outlive our UnsavedFile objects. This is why we need the
-    # contents_holder and filename_holder lists, to make sure the string objects
-    # are still around when we call CandidatesForQueryAndLocationInFile.  We do
-    # this to avoid an extra copy of the entire file contents.
-
-    if not query:
     self.contents_holder = []
     self.filename_holder = []
     for buffer in GetUnsavedBuffers():
@@ -149,6 +138,24 @@ class ClangCompleter( Completer ):
 
       files.append( unsaved_file )
 
+    return files
+
+
+  def CandidatesForQueryAsync( self, query ):
+    # TODO: sanitize query
+
+    # CAREFUL HERE! For UnsavedFile filename and contents we are referring
+    # directly to Python-allocated and -managed memory since we are accepting
+    # pointers to data members of python objects. We need to ensure that those
+    # objects outlive our UnsavedFile objects. This is why we need the
+    # contents_holder and filename_holder lists, to make sure the string objects
+    # are still around when we call CandidatesForQueryAndLocationInFile.  We do
+    # this to avoid an extra copy of the entire file contents.
+
+    files = indexer.UnsavedFileVec()
+    if not query:
+      files = self.GetUnsavedFilesVector()
+
     line, _ = vim.current.window.cursor
     column = int( vim.eval( "s:completion_start_column" ) ) + 1
     current_buffer = vim.current.buffer
@@ -167,7 +174,9 @@ class ClangCompleter( Completer ):
 
 
   def OnFileEnter( self ):
-    pass
+    self.future = self.completer.UpdateTranslationUnit(
+      vim.current.buffer.name,
+      self.GetUnsavedFilesVector() )
 
 
 
@@ -211,12 +220,13 @@ def CurrentLineAndColumn():
   return line, column
 
 
-def ShouldUseClang( start_column ):
-  if not CLANG_COMPLETION_ENABLED:
-    return False
-
+def ClangAvailableForFile():
   filetype = vim.eval( "&filetype" )
-  if filetype not in CLANG_FILETYPES:
+  return filetype in CLANG_FILETYPES
+
+
+def ShouldUseClang( start_column ):
+  if not CLANG_COMPLETION_ENABLED or not ClangAvailableForFile():
     return False
 
   line = vim.current.line