#!/bin/bash
# SPDX-License-Identifier: GPL-2.0

[ -x "$GIT" ]       || export GIT=git
[ -d "$KERNELSRC" ] || export KERNELSRC=.

LKML="linux-kernel@vger.kernel.org"

check_ksrc() {
    if [ -d $KERNELSRC/arch ] && \
       [ -d $KERNELSRC/block ] && \
       [ -d $KERNELSRC/init ] && \
       [ -d $KERNELSRC/kernel ] && \
       [ -d $KERNELSRC/sound ] && \
       [ -d $KERNELSRC/drivers ] && \
       [ -d $KERNELSRC/net ] && \
       [ -d $KERNELSRC/include ] && \
       [ -f $KERNELSRC/COPYING ] && \
       [ -f $KERNELSRC/MAINTAINERS ] && \
       [ -f $KERNELSRC/CREDITS ] && \
       [ -f $KERNELSRC/Kconfig ] && \
       [ -f $KERNELSRC/Makefile ]; then
        return 0
    else
        echo "$0: cant find the kernel source tree. please call me from the topdir" >&2
        exit 1
    fi
}

check_ksrc

get_files() {
    $GIT diff --name-only "$REF"
}

get_maintainers() {
    $KERNELSRC/scripts/get_maintainer.pl --m --l --remove-duplicates `get_files` |
        grep -v "$LKML" | \
        grep -E "(maintainer|reviewer|open list)" | \
        grep -o '[[:alnum:]+\.\_\-]*@[[:alnum:]+\.\_\-]*'
}

construct_params() {
    echo -n "--to=$LKML "
    for a in $MAINTAINERS; do
        echo -n "--cc=$a "
    done
}

if [ ! "$1" ]; then
    echo "$0: missing git revision to send out" >&2
    echo "" >&2
    echo "for example: 'HEAD^' for sending just the last patch" >&2
    echo >&2
    echo "$0 <git-ref> [<extra params for git-send-mail>]"
    exit 1
fi

REF="$1"
shift

echo "scanning for maintainers ..." >&2
MAINTAINERS=`get_maintainers`

echo "sending mail ..." >&2
$GIT send-email `construct_params` "$REF" "$@"