Slacker's an Elixir bot library for Slack.

It has chat matching functionality built-in, but you can extend it to handle all kinds of events.

Slacker can match regex or literal strings, then execute a given function (module optional).

defmodule TARS do
  use Slacker
  use Slacker.Matcher
  
  match ~r/Sense of humor\. New level setting: ([0-9]+)%/, :set_humor
  match "Great idea. A massive, sarcastic robot.", [CueLight, :turn_on]
  def set_humor(tars, msg, level) do
    reply = "Sense of humor set to #{level}"
    say tars, msg["channel"], reply
  end
end

Slacker will call your function with the matching message hash. You can use say/3 to respond, be sure to include the channel you want to talk to.

Your robot is really just a GenServer, you can catch RTM events from Slack and do whatever you like with them.

defmodule CASE do
  use Slacker
  def handle_cast({:handle_incoming, "presence_change", msg}, state) do
    say self, msg["channel"], "You're the man who brought us the probe?"
    {:noreply, state}
  end
end

You can also use Slack's "Web API" via the Slacker.Web module. All of the available RPC methods are downcased and underscored.

users.getPresence -> Slacker.Web.users_get_presence("your_api_key", user: "U1234567890")

Add this to your deps:

def deps do
  [{:websocket_client, github: "jeremyong/websocket_client"},
  {:slacker,  "~> 0.0.3"}]
end

Create a bot user in the Slack GUI, and then pass your api token to your bot's start_link/1:

{:ok, tars} = TARS.start_link("your_api_token")

It's up to you to supervise your brand new baby bot.

You're going to need to invite your bot to a channel by @-mentioning them.

Gimme dem PR's.

Some of this stuff is a real pain in the ass to test, just do your best. 🚀

TODO:

• Keep a map of usernames to ids.
• Keep a map of channel names to ids.
• Private messaging support.
• RTM tests.

See the LICENSE file. (MIT)