Initial commit with IRC and bot example.

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

lib/config.ex

@@ -0,0 +1,52 @@
+defmodule Omnibot.Config do
+  alias Omnibot.Irc.Msg
+
+  @enforce_keys [:server]
+  defstruct [
+    :server,
+    nick: "omnibot",
+    user: "omnibot",
+    real: "omnibot",
+    port: 6667,
+    ssl: false,
+    modules: [],
+    module_paths: []
+  ]
+
+  @doc ~S"""
+  Gets all channels that the bot should join via its modules.
+  """
+  def all_channels(cfg) do
+    Enum.flat_map(cfg.modules, fn {_, [channels: channels]} -> channels end)
+      |> MapSet.new()
+      |> MapSet.to_list()
+  end
+
+  @doc ~S"""
+  Gets a list of all `{module, mod_cfg}` pairs from the given configuration
+  that are listening to the given channel.
+  """
+  def channel_modules(cfg, channel) do
+    cfg.modules 
+      |> Enum.filter(fn {_, cfg} -> Enum.member?(cfg[:channels] || [], channel) end)
+  end
+
+  def msg_prefix(cfg) do
+    %Msg.Prefix {
+      nick: cfg.nick,
+      user: cfg.user,
+    }
+  end
+
+  @doc ~S"""
+  Make a new message with the given command and parameters using the given
+  configuration to build the prefix.
+  """
+  def msg(cfg, command, params \\ []) do
+    %Msg {
+      prefix: msg_prefix(cfg),
+      command: command,
+      params: params,
+    }
+  end
+end