I'd like to create a text/plain message using Markdown formatting and transform that into a multipart/alternative message where the text/html part has been generated from the Markdown.
I've tried using the filter command to filter this through a python program that creates the message, but it seems that the message doesn't get sent through properly. The code is below (this is just test code to see if I can make multipart/alternative messages at all.
import sys
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
html = """<html>
<body>
This is <i>HTML</i>
</body>
</html>
"""
msgbody = sys.stdin.read()
newmsg = MIMEMultipart("alternative")
plain = MIMEText(msgbody, "plain")
plain["Content-Disposition"] = "inline"
html = MIMEText(html, "html")
html["Content-Disposition"] = "inline"
newmsg.attach(plain)
newmsg.attach(html)
print newmsg.as_string()
Unfortunately, in mutt, you only get the message body sent to the filter command when you compose (the headers are not included). Once I get this working, I think the markdown part won't be too hard.
Looks like Mutt 1.13 has the ability to create a multipart/alternative from an external script. http://www.mutt.org/relnotes/1.13/