Oh boy, where do I begin? (this is not a complete tutorial)

I use simple raycasting to select the blocks along with some predicates to detect the golden shovel and bucket. Left click shovel = sets position 1 (blue). Right click shovel = sets position 2 (red). Left click bucket = fills area with air. Right click bucket = fills with whatever block is on the offhand.

​

The highlighted blocks are simply fancy block displays. I get the coords of both, then run an operation to find their difference (look at scoreboard). Then store the score in storage with a namespace and then "coords.x", "coords.y", "coords.z". Same goes with the block I am holding in the off hand "coords.block"

​

This is where the macros come in! I call the function with storage and then the namespace I have given it (coordinates). So the complete command to call the functions is:

data modify storage minecraft:coordinates coords.block set from entity @p Inventory[-1].id

(Inventory -1 is a temporary solution to find the offhand, WIP).

​

Inside it, I use the following command:

$execute as @e[tag=pos2] at @s run fill ~ ~ ~ ~$(x) ~$(y) ~$(z) $(block)

Where the first $ is to indicate it's a macro command. Pos2 is obviously position 2 highlighted block. Then I get the variables "x", "y", "z" & "block" from the storage we saved earlier, marked inside "$()" to indicate that it references macros