#
# Routines to determine array membership.
#
# These are slow, no doubt; if speed is desired over
# elegance, use:
#
#   IFS=$'\n'; echo "${something[*]}" | grep -c
#

require array_count

#
# Tests if the array $1 contains a member value $2,
# regardless of how many members have this value
#
array_ismember ()
{
    local array=$1
    local member="$2"
    local arrlen=`array_count $array`

    for ((i = 0; i < arrlen; i++))
    do eval [[ "\${${array}[i]}" == "\$member" ]] && return 0;
    done

    return 1
}

#
# Tests if the array $1 contains a member value $2, and only
# returns true if it's uniquely so.
#
array_ismember_unique ()
{
    local array=$1
    local member="$2"
    local arrlen=`array_count $array`

    local already # have we seen this one already?

    for ((i = 0; i < arrlen; i++))
    do
        if eval [[ "\${${array}[i]}" == "\$member" ]]
        then
            if ((already))
            then return 1
            else already=1
            fi
        fi
    done

    if ((already))
    then return 0
    else return 1
    fi
}
# vim:syn=sh:ft=sh