Finish removing Omnibot.State functions

Omnibot.State shouldn't be used anywhere anymore except as a GenServer
being started up in the supervisor.

Also, configuration must be loaded through Config.load/1 rather than
being constructed, because everything expects a tuple of {plugin,
config} now.

Finally, Omnibot.Core must be added to the configuration in order for
basic functionality.

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

test/config_test.exs

@@ -0,0 +1,63 @@
+defmodule Omnibot.ConfigTest do
+  use ExUnit.Case, async: true
+  doctest Omnibot.Config
+  alias Omnibot.Config
+
+  test "channel_plugins works correctly" do
+    cfg = %Config {
+      server: "test",
+      plugins: [
+        {FooBar, channels: ["#foo", "#bar"]},
+        {Foo, channels: ["#foo"]},
+        {Bar, channels: ["#bar"]},
+        {Baz, channels: ["#baz"]},
+        {All, channels: :all},
+      ]
+    }
+
+    plugins = Config.channel_plugins(cfg, "#foo")
+              |> Enum.map(fn {plugin, _} -> plugin end)
+    assert length(plugins) == 3
+    assert Enum.member?(plugins, FooBar)
+    assert Enum.member?(plugins, Foo)
+    assert Enum.member?(plugins, All)
+
+    plugins = Config.channel_plugins(cfg, "#bar")
+              |> Enum.map(fn {plugin, _} -> plugin end)
+    assert length(plugins) == 3
+    assert Enum.member?(plugins, FooBar)
+    assert Enum.member?(plugins, Bar)
+    assert Enum.member?(plugins, All)
+
+    plugins = Config.channel_plugins(cfg, "#baz")
+              |> Enum.map(fn {plugin, _} -> plugin end)
+    assert length(plugins) == 2
+    assert Enum.member?(plugins, Baz)
+    assert Enum.member?(plugins, All)
+
+    plugins = Config.channel_plugins(cfg, nil)
+              |> Enum.map(fn {plugin, _} -> plugin end)
+    assert length(plugins) == 1
+    assert Enum.member?(plugins, All)
+  end
+
+  test "all_channels works correctly" do
+    cfg = %Config {
+      server: "testing",
+      plugins: [
+        {FooBar, channels: ["#foo", "#bar"]},
+        {Foo, channels: ["#foo"]},
+        {Bar, channels: ["#bar"]},
+        {Baz, channels: ["#baz"]},
+        {All, channels: :all},
+      ],
+    }
+
+    channels = Config.all_channels(cfg)
+
+    assert length(channels) == 3
+    assert Enum.member?(channels, "#foo")
+    assert Enum.member?(channels, "#bar")
+    assert Enum.member?(channels, "#baz")
+  end
+end