#!/bin/bash -
#===============================================================================
#
#          FILE: bump-versions.sh
#
#         USAGE: ./bump-versions.sh
#
#   DESCRIPTION: Bump the versions for all servant packages
#
#       OPTIONS: See usage
#  REQUIREMENTS: bumper, bash >= 4
#       CREATED: 11.05.2015 21:36
#      REVISION:  ---
#===============================================================================

set -o nounset
set -o errexit

DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
DRY_RUN=false
POSITION="none"
SOURCES_TXT="$( dirname $DIR)/sources.txt"

declare -a SOURCES
readarray -t SOURCES < "$SOURCES_TXT"

usage () {
    echo " bump-versions <POSITION> [-d|--dry-run]"
    echo "             | [-h|--help]"
    echo "    Bumps the specified positional version of all servant packages."
    echo "    POSITION is a number between 0 and 3, inclusive."
    exit 0
}

join () { local IFS="$1"; shift; echo "$*"; }

versions_equal () {
    local NUM=$(find . -name 'servant*.cabal' | xargs grep "^version:" | awk '{ print $2 }' | uniq -c | wc -l)
    if [ 1 -eq $NUM ] ; then
        return 0
    else
        echo "versions of packages are not all the same!" && exit 1
    fi
}

if [ $# -eq 0 ] ; then
    echo "expecting one or more arguments. Got 0"
    usage
elif [ $# -gt 2 ] ; then
    echo "expecting one or more arguments"
    usage
fi

versions_equal

while [ "${1:-unset}" != "unset" ] ; do
    case "$1" in
        -h | --help) usage ;;
        -d | --dry-run) DRY_RUN=true
           shift ;;
        0) if POSITION="none" ; then POSITION=0 ; else usage ; fi
           shift ;;
        1) if POSITION="none" ; then POSITION=1 ; else usage ; fi
           shift ;;
        2) if POSITION="none" ; then POSITION=2 ; else usage ; fi
           shift ;;
        3) if POSITION="none" ; then POSITION=3 ; else usage ; fi
           shift ;;
        *) usage ;;
   esac
done

if $DRY_RUN ; then
   bumper --dry-run -"$POSITION" $(join , "${SOURCES[@]}")
else
   bumper -"$POSITION" $(join , "${SOURCES[@]}")
fi