#!/bin/bash
#
# Handles formatting of raw input
#
#  Copyright (C) 2012  Mike Gerwitz
#
#  This file is part of repo2html.
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# This script should be invoked after setting up the environment. The name of
# the template must be provided and the input will be accepted from stdin. The
# input up until the first empty line will be considered the subject.
# #

tpl="${1:?No template provided}"
msgfmt="${2:-cat}"

[ -x "$tpl" ] || {
  echo "fatal: template '${tpl##*/}' does not exist or is not executable" >&2
  exit 64
}

# grab and format the subject (the template may or may not use it); note that
# 'q' includes the line that is matched (as opposed to Q), so the sed command
# will output the newline and leave the remaining input (the body) untouched
export subject="$( sed -u '/^$/q' | "$msgfmt" -P )"

# the remainder of the input will be formatted and sent directly to the template
"$msgfmt" | "$tpl"