#!/bin/sh

do_clone()
{
    set -ex
    if ! test -e "$1" ; then
        git clone "$2" "$1"
    fi
}

do_clone_all()
{
    do_clone "ffmpeg"   "git://source.ffmpeg.org/ffmpeg.git"
    do_clone "fribidi"  "git://anongit.freedesktop.org/fribidi/fribidi.git"
    do_clone "libass"   "https://code.google.com/p/libass/"
    do_clone "mpv"      "https://github.com/mpv-player/mpv.git"
}

do_gitmaster()
{
    set -ex
    (
        cd "$1"
        git checkout --detach origin/master
        git remote prune origin
    )
}

do_gitmaster_all()
{
    set -ex
    do_clone_all
    do_gitmaster ffmpeg
    do_gitmaster fribidi
    do_gitmaster libass
    do_gitmaster mpv
}

do_releasetag()
{
    (
        cd "$1"
        version=`git tag | grep "^$2[0-9]" | sort -V | tail -n 1`
        git checkout --detach refs/tags/"$version"
    )
}

do_releasetag_all()
{
    set -ex
    do_clone_all
    do_releasetag ffmpeg  'n'
    do_releasetag fribidi ''
    do_releasetag libass  ''
    do_releasetag mpv     'v'
}

if [ x"$1" != x"--skip-selfupdate" ]; then
    (
        set -ex
        git pull --rebase
    )
    exec "$0" --skip-selfupdate "$@"
fi
shift

case "$1" in
    --master)
        do_gitmaster_all
        ;;
    --release|'')
        do_releasetag_all
        ;;
    *)
        echo >&2 "$0 --master"
        echo >&2 "$0 --release"
        exit 0
        ;;
esac