list-peripheral-methods.lua

local args = {...}
local sides = {}

if args[1] ~= nil then
    sides[1] = args[1]
else
    sides = peripheral.getNames()
end

local only1Peripheral = args[1] ~= nil or #sides == 1

for side in sides do
     if not only1Peripheral then
         print("Side " .. side .. ":")
     end
    for i, v in ipairs(peripheral.getMethods(side)) do
        local startChar
        if only1Peripheral then
            startChar = ""
        else
            startChar = "\t"
        end

        print(startChar .. i .. ": " .. v)
    end
end