1 files changed, 1 insertions, 23 deletions
diff --git a/mu4web/main.py b/mu4web/main.py
index 3cc39dc..8a4baec 100644
--- a/mu4web/main.py
+++ b/mu4web/main.py
@@ -46,6 +46,7 @@ from .components import (
     attachement_tree,
     login_page,
 )
+from .util import MutableString
 
 #
 # A few operations depend on the index of attachements. These index
@@ -195,29 +196,6 @@ def raw_message():
     return flask.send_file(filename, mimetype='message/rfc822')
 
 
-class MutableString:
-    """
-    A mutatable string.
-
-    Strings are immutable by default in python. This works almost
-    exactly like a regular string, but ``+=`` actually changes the
-    object in place.
-    """
-
-    def __init__(self) -> None:
-        self.str = ''
-
-    def __iadd__(self, other: str) -> 'MutableString':
-        self.str += other
-        return self
-
-    def __repr__(self) -> str:
-        return f'MutableString("{self.str}")'
-
-    def __str__(self) -> str:
-        return self.str
-
-
 class IMGParser(HTMLParser):
     """
     Rewrites HTML image tags to be safer/have more functionality.