TestRun

PosOffset = {x=0,y=0,z=0}
Forward = {x=1,y=0,z=0}
function Move(direction)
    PosOffset.x=PosOffset.x+Forward.x
    PosOffset.y=PosOffset.y+Forward.y
    PosOffset.z=PosOffset.z+Forward.z
end
function shift(direction)
    local x,z = Forward.x,Forward.z
    if direction=="right" then
        Forward.x = (z == 1 and -1) or (z == -1 and 1) or (x ~= 0 and 0)
        Forward.z = (x == 1 and 1) or (x == -1 and -1) or (z ~= 0 and 0)
    end
    if direction=="left" then
        Forward.z = (x == 1 and -1) or (x == -1 and 1) or (z ~= 0 and 0)
        Forward.x = (z == 1 and 1) or (z == -1 and -1) or (x ~= 0 and 0)
    end
end
function GetDirection()
    if Forward.x==1 then
        return "forward"
    elseif Forward.x==-1 then
        return "backwards"
    elseif Forward.z==1 then
        return "right"
    elseif Forward.z==-1 then
        return "left"
    end
end
function IsFull()
    local f = true
    for i = 1,16 do
        if turtle.getItemCount(i) == 0 then
            f=false
        end
    end
    return f
end
function Return()
end
function SetDirection(dir)
    local DIR = GetDirection()
    if DIR~=dir:lower() then
        local l,r = 0,0
        if DIR == "left" then
            l,r = ((dir=="forward"and 1)or 0),((dir=="backwards"and 1)or(dir=="right"and 2)or 0)
        elseif DIR == "right" then
            l,r = ((dir=="backwards"and 1)or 0),((dir=="forward"and 1)or(dir=="left"and 2)or 0)
        elseif DIR == "backwards" then
            l,r = ((dir=="right"and 1)or 0),((dir=="left"and 1)or(dir=="forward"and 2)or 0)
        elseif DIR == "forward" then
            l,r = ((dir=="left"and 1)or 0),((dir=="right"and 1)or(dir=="backwards"and 2)or 0)
        end
        for i = 1,r do shift("right") turtle.turnRight() end
        for i = 1,l do shift("left") turtle.turnLeft() end
    end
end
function Quarry(x,y,z)
end