local component = require("component")
local sides = require("sides")
local os = require("os")

local function main()
    local dist_sets = {}
    local input_cands = { sides.east, sides.west }
    local output_cands = { sides.north, sides.south, sides.up }
    for addr, type in component.list() do        
        if type == "transposer" then
            local tp = component.proxy(addr)
            local input = nil
            if tp.getInventorySize(input_cands[1]) ~= nil then input = input_cands[1]
            else input = input_cands[2]
            local valid_sides = {}
            for _, cand in pairs(output_cands) do
                if tp.getInventorySize(cand) ~= nil then
                    table.insert(valid_sides, cand)
                end
            end
            table.insert(dist_sets, { tp = tp, valid_sides = valid_sides })
        end
    end
    while true do
        for _, dist_set in pairs(dist_sets) do
            for _, valid_out in pairs(dist_set.valid_sides) do
                while tp.getStackInSlot(dist_set.input, 1) == nil do os.sleep(0.1) end
                while tp.getStackInSlot(valid_out, 1) ~= nil do os.sleep(0.1) end
                for slot = 1, 2 do
                    tp.transferItem(dist_set.input, dist_set.valid_out, 1, slot, slot)
                end
            end
        end
    end
end

main()