Add mono to command for non-windows systems

python/ycm/completers/cs/cs_completer.py

@@ -20,6 +20,7 @@
 
 import vim
 import os
+from sys import platform
 import glob
 from ycm.completers.threaded_completer import ThreadedCompleter
 from ycm import vimsupport
@@ -121,6 +122,9 @@ class CsharpCompleter( ThreadedCompleter ):
       vimsupport.PostVimMessage( SERVER_NOT_FOUND_MSG.format( omnisharp ) )
       return
 
+    if not platform.startswith('win'):
+      omnisharp = "mono " + omnisharp
+
     solutionfile = os.path.join( folder, solutionfile )
     # command has to be provided as one string for some reason
     command = [ omnisharp + ' -p ' + str( self._omnisharp_port ) + ' -s ' +