mquote

mquote - format MSG as a quotation.

This is a tweaked copy of mquote from mblaze that adds the date of the original message.

#!/bin/sh

Extract the sender

: ${from:=$(mhdr -d -h x-original-from "$1")}
: ${from:=$(mhdr -d -h from "$1")}
: ${from:=Someone}

and the date

pfmt="%a, %d %b %Y %H:%M:%S %z"
: ${date:=$(mhdr -d -h date "$1")}
date="${date:+$(dateconv -f "$pfmt" "$date")}"

printf '%s%s wrote:\n' "${date:+On $date, }" "$from"

Then strip the signature, empty lines and prefix everything with ">"

{ mshow -R "$1" || mshow -h '' -N "$1"; } |
	sed -n '/^-- $/,$!p'   |
	sed -e :a -e '/^\n*$/{$d;N;ba' -e '}' |
	sed 's/^/> /'