#!/bin/bash
# (re)quote input lines email using $QUOTE to appropriate level.
# It's intended use is for cleaning up mails or reformatting comments etc.
#
# License: LGPLv2
#
# Note fmt has the --prefix option that does the appropriate thing
# for C comments for e.g. so the main use of this script is for
# badly formatted email.

QUOTE="> "
MIN_TEXT_LEN=8

if [ $# == 3 ]; then
    QUOTE="$1"
    shift
fi

if [ $# != 2 ]; then
    echo "Usage: $0 [quote_string(> )] response_level(starting at 0) line_width" >&2
    exit 1
fi

RESPONSE_LEVEL=$1
TEXT_WIDTH=`expr $2 - $1 \* ${#QUOTE}`

if [ $TEXT_WIDTH -lt $MIN_TEXT_LEN ]; then
    echo "Aborting as line length will be less than $MIN_TEXT_LEN" >&2
    exit 1
fi

for i in `seq 1 $RESPONSE_LEVEL`; do
    RESPONSE_DELIM="$RESPONSE_DELIM$QUOTE"
done
RESPONSE_DELIM=`echo "$RESPONSE_DELIM" | sed 's/[ ]*$//'` #remove tailing spaces

QUOTE_DEL=`echo "$QUOTE" | tr -d ' '`
tr -ds "$QUOTE_DEL\\n" ' ' |
fmt -w$TEXT_WIDTH |
sed -e "s/^[ ]*\(.*\)/$RESPONSE_DELIM \1/"