#!/bin/sh

die()
{
    printf '%s: Error: %s\n' "$0" "$*" >&2
    exit 1
}

parseopts()
{
    while [ $# -gt 0 ]
    do
        case "$1" in
            -q | --quiet )
                exec 2>/dev/null
                ;;
            -y | --kill-last-process )
                FIRESLAY_KILL_LAST_PROCESS=y
                ;;
            --)
                shift
                break
                ;;
            -* )
                die unknown option
                ;;
            *)
                break
                ;;
        esac
        shift
    done
    [ $# = 0 ] || die usage
}

main()
{
    parseopts "$@"

    set -- $(web_content_pids)

    (
        case $# in
            0 ) echo "$0: Warning: Not slaying: no Web Content process found." >&2
                exit
                ;;
            1 ) if ! [ "$FIRESLAY_KILL_LAST_PROCESS" ]
                then
                    echo "$0: Warning: Not slaying: only one 'Web Content' process.  Specify -y to kill it." >&2
                    exit
                fi
                ;;
            * ) shift
                ;;
        esac
        set -x
        ps $* >&2
        kill $*
    )

    r=$?
    ps $* >&2
    exit $r
}

web_content_pids()
{
    top -w512 -bn1 -o '%MEM' | sed -e '1,/^$/d' | {
        while read line
        do set -- $line
           [ "${12} ${13}" = "Web Content" ] || continue
           [ "${8}" != Z ] || continue
           echo $1
        done
    }
}

main "$@"