Adding the cursor identifier on InsertLeave

This should help catch cases where the user jumps to an identifier and then
edits it in place; we want to add that new ident to the db ASAP because the user
may want to have it completed soon.

Still, we're not perfect. If the user just deletes chars with 'x' or 'd' in Vim
and therefore never even enters insert mode we are obviously not going to pick
up that identifier until the next full file sweep.

autoload/youcompleteme.vim

@@ -140,11 +140,9 @@ endfunction
 
 
 function! s:OnInsertLeave()
-  " TODO: Also, look at the current identifier under the cursor on InsertLeave
-  " and add it to the identifier database; this should catch the cases where the
-  " user slightly changes a variable name in-place
   let s:omnifunc_mode = 0
   call s:UpdateDiagnosticNotifications()
+  py identcomp.AddIdentifierUnderCursor()
 endfunction
 
 

python/ycm.py

@@ -82,6 +82,20 @@ class IdentifierCompleter( Completer ):
     self.AddIdentifier( PreviousIdentifier() )
 
 
+  def AddIdentifierUnderCursor( self ):
+    cursor_identifier = vim.eval( 'expand("<cword>")' )
+    if not cursor_identifier:
+      return
+
+    stripped_cursor_identifier = ''.join( ( x for x in
+                                            cursor_identifier if
+                                            IsIdentifierChar( x ) ) )
+    if not stripped_cursor_identifier:
+      return
+
+    self.AddIdentifier( stripped_cursor_identifier )
+
+
   def AddBufferIdentifiers( self ):
     filetype = vim.eval( "&filetype" )
     filepath = vim.eval( "expand('%:p')" )