options:
    p: &8[&3Walls&8]

    # dynamic time span scaling, don't change if you don't know how it works
    scaleMax: 0.045
    scaleMin: 0.005
    scalePlayers: 30

    # how long to wait between progress notifications
    notify-delay: 3 seconds

    # name of spawn world
    spawn-world: spawn

command /setwalls <world> <int> [<int=0>] [<int=0>] [<item=bedrock>] [<number>] [<item>]:
    permission: skript.setwalls
    usage: /setwalls <world> <radius> [<center x>] [<center z>] [<block>]
    trigger:
        if "%arg 1%" is "{@spawn-world}":
            message "{@p} &7http://i.imgur.com/pTcKZvJ.jpg"
            stop

        # time for catch-up/notify checking
        set {_time.tick} to now
        set {_time.notify} to now
        set {_time.start} to now

        # corner bottom blocks
        set {_r} to arg 2+0.5
        set {_++} to (block at location at {_r}+(arg 3), 0.5, {_r}+(arg 4) of the world arg-1)
        set {_+-} to (block at location at {_r}+(arg 3), 0.5, 0-{_r}+(arg 4) of the world arg-1)
        set {_--} to (block at location at 0-{_r}+(arg 3), 0.5, 0-{_r}+(arg 4) of the world arg-1)
        set {_-+} to (block at location at 0-{_r}+(arg 3), 0.5, {_r}+(arg 4) of the world arg-1)

        # counters for progress
        set {_processed} to 0
        set {_total} to ((arg 2)*2-1)*4

        if arg 6 is not set:
            # dynamic tick time calculation
            set {_playerCount} to size of all players
            if {_playerCount} > {@scalePlayers}:
                set {_playerCount} to {@scalePlayers}
            # MATHZ
            set {_seconds} to {@scaleMax}-({@scaleMax}-{@scaleMin})*({_playerCount}/{@scalePlayers})
            set {_usage} to 100*{_seconds}/0.05
            set {_maxTime} to "%{_seconds}% seconds" parsed as timespan
        else:
            # forced time
            set {_usage} to arg 6
            set {_maxTime} to "%{_usage}*0.0005% seconds" parsed as timespan

        message "{@p} &cGeneration started by &e%command sender%&7!" to all ops
        message "{@p} &7World: &9%arg 1% &r &r &r &r &r &r &7Block: &9%arg 5% &r &r &r &r &r &r &7Usage:" to all ops
        message "{@p} &7Radius/Center: &9%arg 2%&7@&9%arg 3%&7,&9%arg 4% &7(&9%arg 2*2%²&7) &r &r &r &r &9%{_usage}%%%" to all ops

        loop blocks from {_++} to {_+-}:
            loop blocks from loop-block to block 255 above loop-block:
                if arg 7 is set:
                    chance of 50%:
                        set loop-block-2 to arg 5
                    else:
                        set loop-block-2 to arg 7
                else:
                    set loop-block-2 to arg 5

            set {_processed} to {_processed}+1

            if {_time.tick} was more than {_maxTime} ago:
                wait 1 tick
                set {_time.tick} to now
                if {_time.notify} was more than {@notify-delay} ago:
                    message "{@p} &7Progress in &9%arg 1%&7: &5%100*{_processed}/{_total}%%%&7!" to all ops
                    set {_time.notify} to now

        loop blocks from {_+-} to {_--}:
            loop blocks from loop-block to block 255 above loop-block:
                if arg 7 is set:
                    chance of 50%:
                        set loop-block-2 to arg 5
                    else:
                        set loop-block-2 to arg 7
                else:
                    set loop-block-2 to arg 5

            set {_processed} to {_processed}+1

            if {_time.tick} was more than {_maxTime} ago:
                wait 1 tick
                set {_time.tick} to now
                if {_time.notify} was more than {@notify-delay} ago:
                    message "{@p} &7Progress in &9%arg 1%&7: &5%100*{_processed}/{_total}%%%&7!" to all ops
                    set {_time.notify} to now

        loop blocks from {_--} to {_-+}:
            loop blocks from loop-block to block 255 above loop-block:
                if arg 7 is set:
                    chance of 50%:
                        set loop-block-2 to arg 5
                    else:
                        set loop-block-2 to arg 7
                else:
                    set loop-block-2 to arg 5

            set {_processed} to {_processed}+1

            if {_time.tick} was more than {_maxTime} ago:
                wait 1 tick
                set {_time.tick} to now
                if {_time.notify} was more than {@notify-delay} ago:
                    message "{@p} &7Progress in &9%arg 1%&7: &5%100*{_processed}/{_total}%%%&7!" to all ops
                    set {_time.notify} to now

        loop blocks from {_-+} to {_++}:
            loop blocks from loop-block to block 255 above loop-block:
                if arg 7 is set:
                    chance of 50%:
                        set loop-block-2 to arg 5
                    else:
                        set loop-block-2 to arg 7
                else:
                    set loop-block-2 to arg 5

            set {_processed} to {_processed}+1

            if {_time.tick} was more than {_maxTime} ago:
                wait 1 tick
                set {_time.tick} to now
                if {_time.notify} was more than {@notify-delay} ago:
                    message "{@p} &7Progress in &9%arg 1%&7: &5%100*{_processed}/{_total}%%%&7!" to all ops
                    set {_time.notify} to now

        message "{@p} &aFinished in &9%arg 1%&a! &7(%difference between {_time.start} and now%)" to all ops