utils.rb in pycall-0.1.0.alpha.20170307

- old
+ new

@@ -1,7 +1,12 @@
 module PyCall
   module Utils
+    def append_sys_path(path_str)
+      pyobj = LibPython.PyUnicode_DecodeUTF8(path_str, path_str.bytesize, nil)
+      sys.path.append.(pyobj)
+    end
+
     def callable?(pyobj)
       case pyobj
       when PyObject
       when PyTypeObject
         pyobj = PyObject.new(pyobj.to_ptr)
@@ -17,26 +22,45 @@
       value = LibPython.PyObject_Dir(pyobj)
       return value.to_ruby unless value.null?
       raise PyError.fetch
     end
 
+    def incref(pyobj)
+      LibPython.Py_IncRef(pyobj)
+      pyobj
+    end
+
+    def decref(pyobj)
+      LibPython.Py_DecRef(pyobj)
+      pyobj.send :pointer=, FFI::Pointer::NULL
+      pyobj
+    end
+
     def int(pyobj)
       @int ||= PyCall.eval('int')
       @int.(pyobj)
     end
 
     def len(pyobj)
       @len ||= PyCall.eval('len')
       @len.(pyobj)
     end
 
+    def None
+      LibPython.Py_None
+    end
+
     def slice(*args)
       Slice.new(*args)
     end
 
     def str(pyobj)
       @str ||= PyCall.eval('str')
       @str.(pyobj)
+    end
+
+    def sys
+      @sys ||= PyCall.import_module('sys')
     end
 
     def tuple(*args)
       PyCall::Tuple[*args]
     end