Module:Minor planet list link

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Implements {{Minor planet list link}}

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local p = {}

function p.LoMP(frame)
	-- For calling from #invoke.
	local pframe = frame:getParent()
	local args = pframe.args
	return p._LoMP(args)
end

function p._LoMP(args)
	local link, result
	-- For calling from other Lua modules.
	local num = tonumber(args[1])
    if not num then
        local warning = require('Module:If preview')._warning
        return warning({'Non-numeric or missing asteroid number'})
    end
	local subsec = string.sub(tostring(num + 1000), -3)
	if (num <= 1000) then
		link = "List of minor planets: 1–1000#"..subsec
	else
		local pagefrom = math.floor((num - 1) / 1000)
		local pageto = pagefrom + 1
		link = "List of minor planets: "..pagefrom.."001–"..pageto.."000#"..subsec
	end
	if (args[2] == nil) then
		result = "[["..link.."]]"
	else
		result = "[["..link.."|"..args[2].."]]"
	end
	return result
end

return p