#!/bin/bash
#
# Copyright (C) 2009 David L. Cantrell Jr. <dcantrell@redhat.com>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

# Does a batch send using git-format-patch and git-send-email.  I like to
# have an intro message with all patches sent as replies to the intro msg.
# In a threaded mail reader, it would look like:
#
#      Intro message about patches
#          [PATCH] patch 1
#          [PATCH] patch 2
#          [PATCH] patch 3
#          ....
#
# By default, git-send-email sends each patch as a reply to the previous, so
# you get a nasty stairstep thing and no intro text.  It looks like this:
#
#      [PATCH] patch 1
#          [PATCH] patch 2
#              [PATCH] patch 3
#                  ....
#

CWD="$(pwd)"
PROG="$(basename ${0})"

usage() {
    echo "Usage: ${PROG} <recipient email addr> [single patch]"
    echo
    echo "If you specify a single patch file after the recipient email address,"
    echo "${PROG} will send just that patch.  If you do not specify a"
    echo "single patch, ${PROG} will look for a _msg file and send"
    echo "that first with all *.patch files as replies to the _msg file."
}

dest="${1}"

if [ -z "${dest}" ]; then
    usage
    exit 1
fi

echo "${dest}" | grep -q '@'
if [ $? -eq 1 ]; then
    usage
    exit 2
fi

if [ ! -f "${CWD}/_msg" ]; then
    if [ -f "${2}" ]; then
        git send-email --no-chain-reply-to --quiet --to ${dest} ${2}
    else
        echo "Missing intro message, please run git-msg-template first." >&2
        echo "Or call ${PROG} with a single patch to send." >&2
        exit 3
    fi
else
    patches="$(ls -1 ${CWD}/*.patch 2>/dev/null)"
    if [ -z "${patches}" ]; then
        echo "No patches found, please run 'git format-patch'." >&2
        exit 4
    fi

    git send-email --no-chain-reply-to --quiet --to ${dest} _msg *.patch
fi