1 files changed, 25 insertions, 19 deletions

diff --git a/src/mailman/chains/base.py b/src/mailman/chains/base.py
index 9507d8fbc..45301abc3 100644
--- a/src/mailman/chains/base.py
+++ b/src/mailman/chains/base.py
@@ -18,7 +18,6 @@
 """Base class for terminal chains."""
 
 from mailman.config import config
-from mailman.core.i18n import _
 from mailman.interfaces.chain import (
     IChain, IChainIterator, IChainLink, IMutableChain, LinkAction)
 from mailman.interfaces.rules import IRule
@@ -28,24 +27,6 @@ from zope.interface import implementer
 
 
 @public
-def format_reasons(reasons):
-    """Translate and format hold and rejection reasons.
-
-    :param reasons: A list of reasons from the rules that hit.  Each reason is
-        a string to be translated or a tuple consisting of a string with {}
-        replacements and one or more replacement values.
-    :returns: A list of the translated and formatted strings.
-    """
-    new_reasons = []
-    for reason in reasons:
-        if isinstance(reason, tuple):
-            new_reasons.append(_(reason[0]).format(*reason[1:]))
-        else:
-            new_reasons.append(_(reason))
-    return new_reasons
-
-
-@public
 @implementer(IChainLink)
 class Link:
     """A chain link."""
@@ -107,6 +88,31 @@ class TerminalChainBase:
 
 @public
 @abstract_component
+@implementer(IChain)
+class JumpChainBase:
+    """A base chain that simplifies jumping to another chain."""
+    def jump_to(self, mlist, msg, msgsdata):
+        """Return the chain to jump to.
+
+        This must be overridden by subclasses.
+
+        :param mlist: The mailing list.
+        :param msg: The message.
+        :param msgdata: The message metadata.
+        :return: The name of the chain to jump to.
+        :rtype: str
+        """
+        raise NotImplementedError
+
+    def get_links(self, mlist, msg, msgdata):
+        jump_chain = self.jump_to(mlist, msg, msgdata)
+        return iter([
+            Link('truth', LinkAction.jump, jump_chain),
+            ])
+
+
+@public
+@abstract_component
 @implementer(IMutableChain)
 class Chain:
     """Generic chain base class."""