Bishop movement thing

local dir1 = math.min(bishop.x, bishop.y)
local skip = false

for i = 1, dir1 do
    if skip then
        break
        --either break or keep returning false...
    end

    local x = bishop.x-i+1
    local y = bishop.y-i+1

    if x == bishop.x and y == bishop.y then
        --return true, since it's the original position
    elseif grid[x][y] == false then
        --return true, since it's an empty slot
    elseif grid[x][y] == piece on the same side then
        --return false, for obvious reasons
    elseif grid[x][y] == piece of opposite side then
        skip = true
        --return true, since you can move, but set skip,
        --so no further movements can be done
    end
end

--dir1 would be moving top-left


local dir2 = math.min(8-bishop.x, 8-bishop.y)

for i = 1, dir2 do
    local x = bishop.x+i-1
    local y = bishop.y+i-1

    --do same stuff, but you'll need to reset the skip variable
end

--dir2 is moving down-right


local dir3 = math.min(bishop.y, 8-bishop.x)

for i = 1, dir3 do
    local x = bishop.x+i-1
    local y = bishop.y-i+1

    --do same stuff, but you'll need to reset the skip variable
end

--dir3 is moving top-right


local dir4 = math.min(bishop.x, 8-bishop.y)

for i = 1, dir4 do
    local x = bishop.x-i+1
    local y = bishop.y+i-1

    --do same stuff, but you'll need to reset the skip variable
end

--dir4 is moving bottom-left