1 files changed, 98 insertions, 0 deletions
diff --git a/shard/lib/cli/cli.ex b/shard/lib/cli/cli.ex
new file mode 100644
index 0000000..2fbf8c2
--- /dev/null
+++ b/shard/lib/cli/cli.ex
@@ -0,0 +1,98 @@
+defmodule SCLI do
+  @moduledoc """
+  Small command line interface for the chat application
+  """
+
+  def run() do
+    run(nil)
+  end
+
+  defp run(pid) do
+    handle_messages()
+
+    nick = Shard.Identity.get_nickname
+    prompt = case pid do
+      nil -> "(no channel) #{nick}: "
+      _ -> 
+        {:chat, chan} = GenServer.call(pid, :manifest)
+        "##{chan} #{nick}: "
+    end
+
+    str = prompt |> IO.gets |> String.trim
+    cond do
+      str == "/quit" ->
+        nil
+      String.slice(str, 0..0) == "/" ->
+        command = str |> String.slice(1..-1) |> String.split(" ")
+        pid2 = handle_command(pid, command)
+        run(pid2)
+      true -> 
+        if str != "" do
+          GenServer.cast(pid, {:chat_send, str})
+        end
+        run(pid)
+    end
+  end
+
+  defp handle_messages() do
+    receive do
+      {:chat_recv, chan, {ts, nick, msg}} ->
+        IO.puts "#{ts |> DateTime.from_unix! |> DateTime.to_iso8601}  ##{chan}  <#{nick}> #{msg}"
+        handle_messages()
+      {:chat_send, _, _} ->
+        # do nothing
+        handle_messages()
+    after 10 -> nil
+    end
+  end
+
+  defp handle_command(pid, ["connect", ipstr, portstr]) do
+    {:ok, ip} = :inet.parse_address (to_charlist ipstr)
+    {port, _} = Integer.parse portstr
+    Shard.Manager.add_peer(ip, port)
+    pid
+  end
+
+  defp handle_command(pid, ["list"]) do
+    IO.puts "List of known channels:"
+
+    for {_chid, manifest, _chpid} <- :ets.tab2list(:shard_db) do
+      {:chat, chan} = manifest
+      IO.puts "##{chan}"
+    end
+    pid
+  end
+
+  defp handle_command(pid, ["hist"]) do
+    GenServer.call(pid, {:read_history, nil, 25})
+    |> Enum.each(fn {{ts, nick, msg}, true} ->
+      IO.puts "#{ts |> DateTime.from_unix! |> DateTime.to_iso8601}  <#{nick}> #{msg}"
+        end)
+    pid
+  end
+
+  defp handle_command(_pid, ["join", qchan]) do
+    list = for {_chid, manifest, chpid} <- :ets.tab2list(:shard_db),
+               {:chat, chan} = manifest,
+               do: {chan, chpid}
+    case List.keyfind(list, qchan, 0) do
+      nil ->
+        {:ok, pid} = DynamicSupervisor.start_child(Shard.DynamicSupervisor, {SApp.Chat, qchan})
+        GenServer.cast(pid, {:subscribe, self()})
+        pid
+      {_, pid} ->
+        IO.puts "Switching to ##{qchan}"
+        pid
+    end
+  end
+
+  defp handle_command(pid, ["nick", nick]) do
+    Shard.Identity.set_nickname nick
+    pid
+  end
+
+  defp handle_command(pid, _cmd) do
+    IO.puts "Invalid command"
+    pid
+  end
+end