parse multiline headers from editor input

The input still contains utf-8 encoded stuff tped in by the user (in headers and body), that needs
to be recoded to mime format. Hence we do it ourselves.
This adds handling for multiline header values and fixes issue #31

alot/command.py

@@ -17,6 +17,7 @@
 Copyright (C) 2011 Patrick Totzke <patricktotzke@gmail.com>
 """
 import os
+import re
 import code
 import glob
 import logging
@@ -751,17 +752,29 @@ def apply(self, ui):
             self.mail = ui.current_buffer.get_email()
 
         def openEnvelopeFromTmpfile():
+            # This parses the input from the tempfile.
+            # we do this ourselves here because we want to be able to 
+            # just type utf-8 encoded stuff into the tempfile and let alot worry
+            # about encodings.
+
+            # get input
             f = open(tf.name)
             enc = settings.config.get('general', 'editor_writes_encoding')
             editor_input = f.read().decode(enc)
-
-            #split editor out
             headertext, bodytext = editor_input.split('\n\n', 1)
 
+            # go through multiline, utf-8 encoded headers
+            key = value = None
             for line in headertext.splitlines():
-                key, value = line.strip().split(':', 1)
-                value = value.strip()
-                del self.mail[key]  # ensure there is only one
+                if re.match('\w+:', line):  #new k/v pair
+                    if key and value:  # save old one from stack
+                        del self.mail[key]  # ensure unique values in mails
+                        self.mail[key] = encode_header(key, value)  # save
+                    key, value = line.strip().split(':', 1)  # parse new pair
+                elif key and value:  # append new line without key prefix to value
+                    value += line
+            if key and value:  # save last one if present
+                del self.mail[key]
                 self.mail[key] = encode_header(key, value)
 
             if self.mail.is_multipart():
@@ -785,7 +798,7 @@ def openEnvelopeFromTmpfile():
         for key in edit_headers:
             value = u''
             if key in self.mail:
-                value = decode_header(self.mail[key])
+                value = decode_header(self.mail.get(key, ''))
             headertext += '%s: %s\n' % (key, value)
 
         if self.mail.is_multipart():