calc_plugin.ex
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calc_plugin.ex
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	defmodule LSG.IRC.CalcPlugin do
	@moduledoc """
	# calc

	* !calc `<expression>`: évalue l'expression mathématique `<expression>`.
	"""

	def irc_doc, do: @moduledoc

	def start_link() do
	GenServer.start_link(__MODULE__, [], name: __MODULE__)
	end

	def init(_) do
	{:ok, _} = Registry.register(IRC.PubSub, "trigger:calc", [plugin: __MODULE__])
	{:ok, nil}
	end

	def handle_info({:irc, :trigger, "calc", message = %IRC.Message{trigger: %IRC.Trigger{type: :bang, args: expr_list}}}, state) do
	expr = Enum.join(expr_list, " ")
	result = try do
	case Abacus.eval(expr) do
	{:ok, result} -> result
	error -> inspect(error)
	end
	rescue
	error -> if(error[:message], do: "#{error.message}", else: "erreur")
	end
	message.replyfun.("#{message.sender.nick}: #{expr} = #{result}")
	{:noreply, state}
	end

	def handle_info(msg, state) do
	{:noreply, state}
	end

	end