[PATCH 5 of 6] mailutil: utf patches with appropriate charset

[Christian Ebert]

# HG changeset patch
# User Christian Ebert <blacktrash at gmx.net>
# Date 1204991685 -3600
# Node ID 6dc138f7bb0debcd50ebd156ac5880f2facc3cda
# Parent  0ebd7f655fdc1fef161a10d0786ceac33b6c5b03
mailutil: utf patches with appropriate charset

diff --git a/hgext/mailutil.py b/hgext/mailutil.py
--- a/hgext/mailutil.py
+++ b/hgext/mailutil.py
@@ -86,3 +86,15 @@
         charset and transfer-encoding accordingly.'''
         s, cs = self.encode(s)
         return email.MIMEText.MIMEText(s, 'plain', cs)
+
+    def mimetextpatch(self, s, subtype='plain'):
+        '''If patch in ascii or utf-8 we can set correct charset.'''
+        # try out utf-16 etc.?
+        for cs in ('us-ascii', 'utf-8'):
+            try:
+                s.decode(cs)
+                return email.MIMEText.MIMEText(s, subtype, cs)
+            except UnicodeDecodeError:
+                pass
+        # pseudo us-ascii; send as binary attachment instead?
+        return email.MIMEText.MIMEText(s, subtype)