-- SPDX-FileCopyrightText: 2017 Daniel Ratcliffe
--
-- SPDX-License-Identifier: LicenseRef-CCPL

if not turtle then
    printError("Requires a Turtle")
    return
end

local tArgs = { ... }
local function printUsage()
    local programName = arg[0] or fs.getName(shell.getRunningProgram())
    print("Usage: " .. programName .. " <slot> <side>")
end

if #tArgs ~= 2 then
    printUsage()
    return
end

local function equip(nSlot, fnEquipFunction)
    turtle.select(nSlot)
    local nOldCount = turtle.getItemCount(nSlot)
    if nOldCount == 0 then
        print("Nothing to equip")
    elseif fnEquipFunction() then
        local nNewCount = turtle.getItemCount(nSlot)
        if nNewCount > 0 then
            print("Items swapped")
        else
            print("Item equipped")
        end
    else
        print("Item not equippable")
    end
end

local nSlot = tonumber(tArgs[1])
local sSide = tArgs[2]
if sSide == "left" then
    equip(nSlot, turtle.equipLeft)
elseif sSide == "right" then
    equip(nSlot, turtle.equipRight)
else
    printUsage()
    return
end