Initial commit with IRC and bot example.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

lib/state.ex

@@ -0,0 +1,74 @@
+defmodule Omnibot.State do
+  use GenServer
+
+  @enforce_keys [:cfg]
+  defstruct [:cfg, channels: MapSet.new()]
+
+  ## Client API
+
+  def start_link(opts) do
+    cfg = opts[:cfg]
+    GenServer.start_link(__MODULE__, %Omnibot.State{
+      cfg: cfg
+    }, opts)
+  end
+
+  @doc "Gets the current configuration from the default State process."
+  def cfg(), do: cfg(__MODULE__)
+
+  @doc "Gets the current configuration from the given State process."
+  def cfg(state) do
+    GenServer.call(state, :cfg)
+  end
+
+  @doc "Gets all channels that the bot is present in from the default State process."
+  def channels(), do: channels(__MODULE__)
+
+  @doc "Gets all channels that the bot is present in from the given State process."
+  def channels(state) do
+    GenServer.call(state, :channels)
+  end
+  
+  @doc "Adds a channel to the list of joined channels of the default State process, if it is not already present."
+  def add_channel(channel), do: add_channel(__MODULE__, channel)
+
+  @doc "Adds a channel to the list of joined channels of the given State process, if it is not already present."
+  def add_channel(state, channel) do
+    GenServer.cast(state, {:add_channel, channel})
+  end
+
+  @doc "Removes a channel from the list of joined channels of the default State process, if it exists."
+  def remove_channel(channel), do: remove_channel(__MODULE__, channel)
+
+  @doc "Removes a channel from the list of joined channels of the given State process, if it exists."
+  def remove_channel(state, channel) do
+    GenServer.cast(state, {:remove_channel, channel})
+  end
+
+  ## Server API
+
+  @impl true
+  def init(state) do
+    {:ok, state}
+  end
+
+  @impl true
+  def handle_call(:cfg, _from, state) do
+    {:reply, state.cfg, state}
+  end
+
+  @impl true
+  def handle_call(:channels, _from, state) do
+    {:reply, state.channels, state}
+  end
+  
+  @impl true
+  def handle_cast({:add_channel, channel}, state) do
+    {:noreply, %{state | channels: state.channels |> MapSet.put(channel)}}
+  end
+
+  @impl true
+  def handle_cast({:remove_channel, channel}, state) do
+    {:noreply, %{state | channels: state.channels |> MapSet.delete(channel)}}
+  end
+end