commit 7b3ec6ae1eea38c8c484c4f0fda5bc091a455bf4
Author: dblock <dblock@dblock.org>
Date:   Fri Jun 19 13:07:31 2015 -0400

    Initial implementing, using Dentaku.

diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.env
diff --git a/.rspec b/.rspec
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--- /dev/null
+++ b/.rspec
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+--format documentation
+--color
diff --git a/.rubocop.yml b/.rubocop.yml
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--- /dev/null
+++ b/.rubocop.yml
@@ -0,0 +1,6 @@
+AllCops:
+  Exclude:
+    - vendor/**/*
+    - bin/**/*
+
+inherit_from: .rubocop_todo.yml
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
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--- /dev/null
+++ b/.rubocop_todo.yml
@@ -0,0 +1,45 @@
+# This configuration was generated by `rubocop --auto-gen-config`
+# on 2015-06-19 13:09:29 -0400 using RuboCop version 0.31.0.
+# The point is for the user to remove these configuration records
+# one by one as the offenses are removed from the code base.
+# Note that changes in the inspected code, or installation of new
+# versions of RuboCop, may require this file to be generated again.
+
+# Offense count: 1
+Lint/HandleExceptions:
+  Enabled: false
+
+# Offense count: 2
+Metrics/AbcSize:
+  Max: 21
+
+# Offense count: 1
+Metrics/CyclomaticComplexity:
+  Max: 7
+
+# Offense count: 19
+# Configuration parameters: AllowURI, URISchemes.
+Metrics/LineLength:
+  Max: 130
+
+# Offense count: 1
+# Configuration parameters: CountComments.
+Metrics/MethodLength:
+  Max: 17
+
+# Offense count: 16
+Style/Documentation:
+  Enabled: false
+
+# Offense count: 1
+# Configuration parameters: Exclude.
+Style/FileName:
+  Enabled: false
+
+# Offense count: 1
+Style/ModuleFunction:
+  Enabled: false
+
+# Offense count: 1
+Style/RescueModifier:
+  Enabled: false
diff --git a/.travis.yml b/.travis.yml
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--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,3 @@
+rvm:
+  - 2.1.6
+
diff --git a/CHANGELOG.md b/CHANGELOG.md
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index 0000000..b018b31
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,3 @@
+### 0.1.0 (Next)
+
+* Initial public release - [@dblock](https://github.com/dblock).
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,125 @@
+# Contributing to SlackMathbot
+
+This project is work of [many contributors](https://github.com/dblock/slack-mathbot/graphs/contributors).
+
+You're encouraged to submit [pull requests](https://github.com/dblock/slack-mathbot/pulls), [propose features and discuss issues](https://github.com/dblock/slack-mathbot/issues).
+
+In the examples below, substitute your Github username for `contributor` in URLs.
+
+## Fork the Project
+
+Fork the [project on Github](https://github.com/dblock/slack-mathbot) and check out your copy.
+
+```
+git clone https://github.com/contributor/slack-mathbot.git
+cd slack-mathbot
+git remote add upstream https://github.com/dblock/slack-mathbot.git
+```
+
+## Create a Topic Branch
+
+Make sure your fork is up-to-date and create a topic branch for your feature or bug fix.
+
+```
+git checkout master
+git pull upstream master
+git checkout -b my-feature-branch
+```
+
+## Bundle Install and Test
+
+Ensure that you can build the project and run tests.
+
+```
+bundle install
+bundle exec rake
+```
+
+## Write Tests
+
+Try to write a test that reproduces the problem you're trying to fix or describes a feature that you want to build.
+Add to [spec](spec).
+
+We definitely appreciate pull requests that highlight or reproduce a problem, even without a fix.
+
+## Write Code
+
+Implement your feature or bug fix.
+
+Ruby style is enforced with [Rubocop](https://github.com/bbatsov/rubocop).
+Run `bundle exec rubocop` and fix any style issues highlighted.
+
+Make sure that `bundle exec rake` completes without errors.
+
+## Write Documentation
+
+Document any external behavior in the [README](README.md).
+
+## Update Changelog
+
+Add a line to [CHANGELOG](CHANGELOG.md) under *Next Release*.
+Make it look like every other line, including your name and link to your Github account.
+
+## Commit Changes
+
+Make sure git knows your name and email address:
+
+```
+git config --global user.name "Your Name"
+git config --global user.email "contributor@example.com"
+```
+
+Writing good commit logs is important. A commit log should describe what changed and why.
+
+```
+git add ...
+git commit
+```
+
+## Push
+
+```
+git push origin my-feature-branch
+```
+
+## Make a Pull Request
+
+Go to https://github.com/contributor/slack-mathbot and select your feature branch.
+Click the 'Pull Request' button and fill out the form. Pull requests are usually reviewed within a few days.
+
+## Rebase
+
+If you've been working on a change for a while, rebase with upstream/master.
+
+```
+git fetch upstream
+git rebase upstream/master
+git push origin my-feature-branch -f
+```
+
+## Update CHANGELOG Again
+
+Update the [CHANGELOG](CHANGELOG.md) with the pull request number. A typical entry looks as follows.
+
+```
+* [#123](https://github.com/dblock/slack-mathbot/pull/123): Reticulated splines - [@contributor](https://github.com/contributor).
+```
+
+Amend your previous commit and force push the changes.
+
+```
+git commit --amend
+git push origin my-feature-branch -f
+```
+
+## Check on Your Pull Request
+
+Go back to your pull request after a few minutes and see whether it passed muster with Travis-CI. Everything should look green, otherwise fix issues and amend your commit as described above.
+
+## Be Patient
+
+It's likely that your change will not be merged and that the nitpicky maintainers will ask you to do more, or fix seemingly benign problems. Hang on there!
+
+## Thank You
+
+Please do know that we really appreciate and value your time and work. We love you, really.
diff --git a/DEPLOYMENT.md b/DEPLOYMENT.md
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--- /dev/null
+++ b/DEPLOYMENT.md
@@ -0,0 +1,25 @@
+## Installation
+
+Create a new Bot Integration under [services/new/bot](http://slack.com/services/new/bot).
+
+![](screenshots/register-bot.png)
+
+On the next screen, note the API token.
+
+## Deploy Slack-Gamebot
+
+[![Deploy to Heroku](https://www.herokucdn.com/deploy/button.png)](https://heroku.com/deploy)
+
+### Environment
+
+#### SLACK_API_TOKEN
+
+Set SLACK_API_TOKEN from the Bot integration settings on Slack.
+
+```
+heroku config:add SLACK_API_TOKEN=...
+```
+
+### Heroku Idling
+
+Heroku free tier applications will idle. Use [UptimeRobot](http://uptimerobot.com) or similar to prevent your instance from sleeping or pay for a production dyno.
diff --git a/Gemfile b/Gemfile
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--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,23 @@
+source 'http://rubygems.org'
+
+ruby '2.1.6'
+
+gem 'hashie'
+gem 'slack-api', '~> 1.1.6', require: 'slack'
+gem 'puma'
+gem 'sinatra'
+gem 'activesupport'
+gem 'dentaku'
+
+group :development, :test do
+  gem 'rake', '~> 10.4'
+  gem 'rubocop', '0.31.0'
+  gem 'foreman'
+end
+
+group :test do
+  gem 'rspec', '~> 3.2'
+  gem 'rack-test', '~> 0.6.2'
+  gem 'vcr'
+  gem 'webmock'
+end
diff --git a/Gemfile.lock b/Gemfile.lock
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--- /dev/null
+++ b/Gemfile.lock
@@ -0,0 +1,105 @@
+GEM
+  remote: http://rubygems.org/
+  specs:
+    activesupport (4.2.1)
+      i18n (~> 0.7)
+      json (~> 1.7, >= 1.7.7)
+      minitest (~> 5.1)
+      thread_safe (~> 0.3, >= 0.3.4)
+      tzinfo (~> 1.1)
+    addressable (2.3.8)
+    ast (2.0.0)
+    astrolabe (1.3.0)
+      parser (>= 2.2.0.pre.3, < 3.0)
+    crack (0.4.2)
+      safe_yaml (~> 1.0.0)
+    dentaku (1.2.6)
+    diff-lcs (1.2.5)
+    eventmachine (1.0.7)
+    faraday (0.9.1)
+      multipart-post (>= 1.2, < 3)
+    faraday_middleware (0.9.1)
+      faraday (>= 0.7.4, < 0.10)
+    faye-websocket (0.9.2)
+      eventmachine (>= 0.12.0)
+      websocket-driver (>= 0.5.1)
+    foreman (0.78.0)
+      thor (~> 0.19.1)
+    hashie (3.4.1)
+    i18n (0.7.0)
+    json (1.8.2)
+    minitest (5.6.1)
+    multi_json (1.11.0)
+    multipart-post (2.0.0)
+    parser (2.3.0.pre.2)
+      ast (>= 1.1, < 3.0)
+    powerpack (0.1.1)
+    puma (2.11.0)
+      rack (>= 1.1, < 2.0)
+    rack (1.6.0)
+    rack-protection (1.5.3)
+      rack
+    rack-test (0.6.3)
+      rack (>= 1.0)
+    rainbow (2.0.0)
+    rake (10.4.2)
+    rspec (3.2.0)
+      rspec-core (~> 3.2.0)
+      rspec-expectations (~> 3.2.0)
+      rspec-mocks (~> 3.2.0)
+    rspec-core (3.2.3)
+      rspec-support (~> 3.2.0)
+    rspec-expectations (3.2.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.2.0)
+    rspec-mocks (3.2.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.2.0)
+    rspec-support (3.2.2)
+    rubocop (0.31.0)
+      astrolabe (~> 1.3)
+      parser (>= 2.2.2.1, < 3.0)
+      powerpack (~> 0.1)
+      rainbow (>= 1.99.1, < 3.0)
+      ruby-progressbar (~> 1.4)
+    ruby-progressbar (1.7.5)
+    safe_yaml (1.0.4)
+    sinatra (1.4.5)
+      rack (~> 1.4)
+      rack-protection (~> 1.4)
+      tilt (~> 1.3, >= 1.3.4)
+    slack-api (1.1.6)
+      faraday (>= 0.7, < 0.10)
+      faraday_middleware (~> 0.8)
+      faye-websocket (~> 0.9.2)
+      multi_json (~> 1.0, >= 1.0.3)
+    thor (0.19.1)
+    thread_safe (0.3.5)
+    tilt (1.4.1)
+    tzinfo (1.2.2)
+      thread_safe (~> 0.1)
+    vcr (2.9.3)
+    webmock (1.21.0)
+      addressable (>= 2.3.6)
+      crack (>= 0.3.2)
+    websocket-driver (0.5.4)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.2)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  activesupport
+  dentaku
+  foreman
+  hashie
+  puma
+  rack-test (~> 0.6.2)
+  rake (~> 10.4)
+  rspec (~> 3.2)
+  rubocop (= 0.31.0)
+  sinatra
+  slack-api (~> 1.1.6)
+  vcr
+  webmock
diff --git a/LICENSE.md b/LICENSE.md
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--- /dev/null
+++ b/LICENSE.md
@@ -0,0 +1,22 @@
+MIT License
+
+Copyright (c) 2015 Daniel Doubrovkine, Artsy and Contributors
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/Procfile b/Procfile
new file mode 100644
index 0000000..4fd3163
--- /dev/null
+++ b/Procfile
@@ -0,0 +1 @@
+web: bundle exec puma -p $PORT
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..44773b7
--- /dev/null
+++ b/README.md
@@ -0,0 +1,52 @@
+Slack-Gamebot
+=============
+
+[![Build Status](https://travis-ci.org/dblock/slack-mathbot.png)](https://travis-ci.org/dblock/slack-mathbot)
+
+A math bot for Slack.
+
+![](screenshots/two-plus-two.gif)
+
+## Installation
+
+Create a new Bot Integration under [services/new/bot](http://slack.com/services/new/bot).
+
+![](screenshots/register-bot.png)
+
+On the next screen, note the API token.
+
+Run `SLACK_API_TOKEN=<your API token> foreman start`
+
+## Production Deployment
+
+See [DEPLOYMENT](DEPLOYMENT.md).
+
+## Usage
+
+### Commands
+
+#### mathbot calculate [expression]
+
+Calculates an expression, currently just basic math. See [Dentaku](https://github.com/rubysolo/dentaku) for what's supported.
+
+#### mathbot
+
+Shows MathBot version and links.
+
+#### mathbot hi
+
+Politely says 'hi' back.
+
+#### mathbot help
+
+Get help.
+
+## Contributing
+
+See [CONTRIBUTING](CONTRIBUTING.md).
+
+## Copyright and License
+
+Copyright (c) 2015, Daniel Doubrovkine, Artsy and [Contributors](CHANGELOG.md).
+
+This project is licensed under the [MIT License](LICENSE.md).
diff --git a/Rakefile b/Rakefile
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--- /dev/null
+++ b/Rakefile
@@ -0,0 +1,18 @@
+require 'rubygems'
+require 'bundler'
+
+Bundler.setup :default, :development
+
+unless ENV['RACK_ENV'] == 'production'
+  require 'rspec/core'
+  require 'rspec/core/rake_task'
+
+  RSpec::Core::RakeTask.new(:spec) do |spec|
+    spec.pattern = FileList['spec/**/*_spec.rb']
+  end
+
+  require 'rubocop/rake_task'
+  RuboCop::RakeTask.new
+
+  task default: [:rubocop, :spec]
+end
diff --git a/app.json b/app.json
new file mode 100644
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--- /dev/null
+++ b/app.json
@@ -0,0 +1,6 @@
+{
+	"name": "Math bot for Slack",
+	"description": "Slack integration with math.",
+	"respository": "https://github.com/dblock/slack-mathbot",
+	"keywords": ["slack", "integration", "math"],
+}
diff --git a/app.rb b/app.rb
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--- /dev/null
+++ b/app.rb
@@ -0,0 +1,11 @@
+require File.expand_path('../config/environment', __FILE__)
+
+require 'sinatra/base'
+
+module SlackMathbot
+  class Web < Sinatra::Base
+    get '/' do
+      'Math is good for you.'
+    end
+  end
+end
diff --git a/app/slack-mathbot.rb b/app/slack-mathbot.rb
new file mode 100644
index 0000000..0a6765b
--- /dev/null
+++ b/app/slack-mathbot.rb
@@ -0,0 +1,18 @@
+require 'slack-mathbot/version'
+require 'slack-mathbot/about'
+require 'slack-mathbot/config'
+require 'slack-mathbot/hooks'
+require 'slack-mathbot/commands'
+require 'slack-mathbot/app'
+
+module SlackMathbot
+  class << self
+    def configure
+      block_given? ? yield(Config) : Config
+    end
+
+    def config
+      Config
+    end
+  end
+end
diff --git a/app/slack-mathbot/about.rb b/app/slack-mathbot/about.rb
new file mode 100644
index 0000000..9401cdb
--- /dev/null
+++ b/app/slack-mathbot/about.rb
@@ -0,0 +1,7 @@
+module SlackMathbot
+  ABOUT = <<-ABOUT
+    #{SlackMathbot::VERSION}
+    https://github.com/dblock/slack-mathbot
+    https://twitter.com/dblockdotorg
+  ABOUT
+end
diff --git a/app/slack-mathbot/app.rb b/app/slack-mathbot/app.rb
new file mode 100644
index 0000000..87f9e71
--- /dev/null
+++ b/app/slack-mathbot/app.rb
@@ -0,0 +1,83 @@
+module SlackMathbot
+  class App
+    cattr_accessor :hooks
+
+    include SlackMathbot::Hooks::Hello
+    include SlackMathbot::Hooks::Message
+
+    def initialize
+      SlackMathbot.configure do |config|
+        config.token = ENV['SLACK_API_TOKEN'] || fail("Missing ENV['SLACK_API_TOKEN'].")
+      end
+      Slack.configure do |config|
+        config.token = SlackMathbot.config.token
+      end
+    end
+
+    def config
+      SlackMathbot.config
+    end
+
+    def self.instance
+      @instance ||= SlackMathbot::App.new
+    end
+
+    def run
+      auth!
+      start!
+    end
+
+    def stop!
+      client.stop
+    end
+
+    private
+
+    def logger
+      @logger ||= begin
+        $stdout.sync = true
+        Logger.new(STDOUT)
+      end
+    end
+
+    def start!
+      loop do
+        client.start
+        @client = nil
+      end
+    end
+
+    def client
+      @client ||= begin
+        client = Slack.realtime
+        hooks.each do |hook|
+          client.on hook do |data|
+            begin
+              send hook, data
+            rescue StandardError => e
+              logger.error e
+              begin
+                Slack.chat_postMessage(channel: data['channel'], text: e.message) if data.key?('channel')
+              rescue
+                # ignore
+              end
+            end
+          end
+        end
+        client
+      end
+    end
+
+    def auth!
+      auth = Slack.auth_test
+      SlackMathbot.configure do |config|
+        config.url = auth['url']
+        config.team = auth['team']
+        config.user = auth['user']
+        config.team_id = auth['team_id']
+        config.user_id = auth['user_id']
+      end
+      logger.info "Welcome '#{SlackMathbot.config.user}' to the '#{SlackMathbot.config.team}' team at #{SlackMathbot.config.url}."
+    end
+  end
+end
diff --git a/app/slack-mathbot/commands.rb b/app/slack-mathbot/commands.rb
new file mode 100644
index 0000000..ab8311a
--- /dev/null
+++ b/app/slack-mathbot/commands.rb
@@ -0,0 +1,6 @@
+require 'slack-mathbot/commands/base'
+require 'slack-mathbot/commands/calculate'
+require 'slack-mathbot/commands/about'
+require 'slack-mathbot/commands/help'
+require 'slack-mathbot/commands/hi'
+require 'slack-mathbot/commands/unknown'
diff --git a/app/slack-mathbot/commands/about.rb b/app/slack-mathbot/commands/about.rb
new file mode 100644
index 0000000..8dd9328
--- /dev/null
+++ b/app/slack-mathbot/commands/about.rb
@@ -0,0 +1,9 @@
+module SlackMathbot
+  module Commands
+    class Default < Base
+      def self.call(data, _command, _arguments)
+        send_message data.channel, SlackMathbot::ABOUT
+      end
+    end
+  end
+end
diff --git a/app/slack-mathbot/commands/base.rb b/app/slack-mathbot/commands/base.rb
new file mode 100644
index 0000000..f89caa1
--- /dev/null
+++ b/app/slack-mathbot/commands/base.rb
@@ -0,0 +1,16 @@
+module SlackMathbot
+  module Commands
+    class Base
+      def self.send_message(channel, text)
+        Slack.chat_postMessage(channel: channel, text: text)
+      end
+
+      def self.logger
+        @logger ||= begin
+          $stdout.sync = true
+          Logger.new(STDOUT)
+        end
+      end
+    end
+  end
+end
diff --git a/app/slack-mathbot/commands/calculate.rb b/app/slack-mathbot/commands/calculate.rb
new file mode 100644
index 0000000..a554d61
--- /dev/null
+++ b/app/slack-mathbot/commands/calculate.rb
@@ -0,0 +1,10 @@
+module SlackMathbot
+  module Commands
+    class Calculate < Base
+      def self.call(data, _command, arguments)
+        result = Dentaku::Calculator.new.evaluate(arguments.join) || 'Got nothing.'
+        send_message data.channel, result.to_s
+      end
+    end
+  end
+end
diff --git a/app/slack-mathbot/commands/help.rb b/app/slack-mathbot/commands/help.rb
new file mode 100644
index 0000000..b9de666
--- /dev/null
+++ b/app/slack-mathbot/commands/help.rb
@@ -0,0 +1,9 @@
+module SlackMathbot
+  module Commands
+    class Help < Base
+      def self.call(data, _command, _arguments)
+        send_message data.channel, 'See https://github.com/dblock/slack-mathbot, please.'
+      end
+    end
+  end
+end
diff --git a/app/slack-mathbot/commands/hi.rb b/app/slack-mathbot/commands/hi.rb
new file mode 100644
index 0000000..85711d3
--- /dev/null
+++ b/app/slack-mathbot/commands/hi.rb
@@ -0,0 +1,9 @@
+module SlackMathbot
+  module Commands
+    class Hi < Base
+      def self.call(data, _command, _arguments)
+        send_message data.channel, "Hi <@#{data.user}>!"
+      end
+    end
+  end
+end
diff --git a/app/slack-mathbot/commands/unknown.rb b/app/slack-mathbot/commands/unknown.rb
new file mode 100644
index 0000000..ef43ec5
--- /dev/null
+++ b/app/slack-mathbot/commands/unknown.rb
@@ -0,0 +1,9 @@
+module SlackMathbot
+  module Commands
+    class Unknown < Base
+      def self.call(data, _command, _arguments)
+        send_message data.channel, "Sorry <@#{data.user}>, I don't understand that command!"
+      end
+    end
+  end
+end
diff --git a/app/slack-mathbot/config.rb b/app/slack-mathbot/config.rb
new file mode 100644
index 0000000..8762192
--- /dev/null
+++ b/app/slack-mathbot/config.rb
@@ -0,0 +1,13 @@
+module SlackMathbot
+  module Config
+    extend self
+
+    attr_accessor :token
+    attr_accessor :url
+    attr_accessor :user
+    attr_accessor :user_id
+    attr_accessor :team
+    attr_accessor :team_id
+    attr_accessor :secret
+  end
+end
diff --git a/app/slack-mathbot/hooks.rb b/app/slack-mathbot/hooks.rb
new file mode 100644
index 0000000..7df4162
--- /dev/null
+++ b/app/slack-mathbot/hooks.rb
@@ -0,0 +1,3 @@
+require 'slack-mathbot/hooks/base'
+require 'slack-mathbot/hooks/hello'
+require 'slack-mathbot/hooks/message'
diff --git a/app/slack-mathbot/hooks/base.rb b/app/slack-mathbot/hooks/base.rb
new file mode 100644
index 0000000..55e1875
--- /dev/null
+++ b/app/slack-mathbot/hooks/base.rb
@@ -0,0 +1,10 @@
+module SlackMathbot
+  module Hooks
+    module Base
+      def included(caller)
+        caller.hooks ||= []
+        caller.hooks << name.demodulize.underscore.to_sym
+      end
+    end
+  end
+end
diff --git a/app/slack-mathbot/hooks/hello.rb b/app/slack-mathbot/hooks/hello.rb
new file mode 100644
index 0000000..8b0a2d1
--- /dev/null
+++ b/app/slack-mathbot/hooks/hello.rb
@@ -0,0 +1,11 @@
+module SlackMathbot
+  module Hooks
+    module Hello
+      extend Base
+
+      def hello(_data)
+        logger.info "Successfully connected to #{SlackMathbot.config.url}."
+      end
+    end
+  end
+end
diff --git a/app/slack-mathbot/hooks/message.rb b/app/slack-mathbot/hooks/message.rb
new file mode 100644
index 0000000..776e356
--- /dev/null
+++ b/app/slack-mathbot/hooks/message.rb
@@ -0,0 +1,33 @@
+module SlackMathbot
+  module Hooks
+    module Message
+      extend Base
+
+      def message(data)
+        data = Hashie::Mash.new(data)
+        bot_name, command, arguments = parse_command(data.text)
+        return unless bot_name == SlackMathbot.config.user
+        klass = command_to_class(command || 'Default')
+        klass.call data, command, arguments
+      end
+
+      private
+
+      def parse_command(text)
+        return unless text
+        text = '= ' + text[1..text.length] if text[0] == '='
+        parts = text.split.reject(&:blank?)
+        if parts && parts[0] == '='
+          parts[0] = SlackMathbot.config.user
+          parts.insert 1, 'calculate'
+        end
+        [parts.first.downcase, parts[1].try(:downcase), parts[2..parts.length]] if parts && parts.any?
+      end
+
+      def command_to_class(command)
+        klass = "SlackMathbot::Commands::#{command.titleize}".constantize rescue nil
+        klass || SlackMathbot::Commands::Unknown
+      end
+    end
+  end
+end
diff --git a/app/slack-mathbot/version.rb b/app/slack-mathbot/version.rb
new file mode 100644
index 0000000..ec90e43
--- /dev/null
+++ b/app/slack-mathbot/version.rb
@@ -0,0 +1,3 @@
+module SlackMathbot
+  VERSION = '0.1.0'
+end
diff --git a/app/slack_mathbot.rb b/app/slack_mathbot.rb
new file mode 100644
index 0000000..bb25115
--- /dev/null
+++ b/app/slack_mathbot.rb
@@ -0,0 +1 @@
+require 'slack-mathbot'
diff --git a/config.ru b/config.ru
new file mode 100644
index 0000000..bf4320f
--- /dev/null
+++ b/config.ru
@@ -0,0 +1,7 @@
+require File.expand_path('../app', __FILE__)
+
+Thread.new do
+  SlackMathbot::App.instance.run
+end
+
+run SlackMathbot::Web
diff --git a/config/application.rb b/config/application.rb
new file mode 100644
index 0000000..c2134eb
--- /dev/null
+++ b/config/application.rb
@@ -0,0 +1,14 @@
+$LOAD_PATH.unshift(File.join(File.dirname(__FILE__), '..', 'app'))
+$LOAD_PATH.unshift(File.dirname(__FILE__))
+
+require 'boot'
+
+Bundler.require :default, ENV['RACK_ENV']
+
+Dir[File.expand_path('../initializers', __FILE__) + '/**/*.rb'].each do |file|
+  require file
+end
+
+require File.expand_path('../application', __FILE__)
+
+require 'slack_mathbot'
diff --git a/config/boot.rb b/config/boot.rb
new file mode 100644
index 0000000..ca944a8
--- /dev/null
+++ b/config/boot.rb
@@ -0,0 +1,5 @@
+require 'rubygems'
+require 'bundler/setup'
+require 'logger'
+require 'active_support'
+require 'active_support/core_ext'
diff --git a/config/environment.rb b/config/environment.rb
new file mode 100644
index 0000000..f45d5f6
--- /dev/null
+++ b/config/environment.rb
@@ -0,0 +1,3 @@
+ENV['RACK_ENV'] ||= 'development'
+
+require File.expand_path('../application', __FILE__)
diff --git a/config/initializers/slack/request.rb b/config/initializers/slack/request.rb
new file mode 100644
index 0000000..66b1583
--- /dev/null
+++ b/config/initializers/slack/request.rb
@@ -0,0 +1,13 @@
+module Slack
+  module Request
+    private
+
+    alias_method :_request, :request
+
+    def request(method, path, options)
+      response = _request(method, path, options)
+      fail response['error'] unless response['ok'] if response.is_a?(Hash)
+      response
+    end
+  end
+end
diff --git a/screenshots/register-bot.png b/screenshots/register-bot.png
new file mode 100644
index 0000000..391a201
Binary files /dev/null and b/screenshots/register-bot.png differ
diff --git a/screenshots/two-plus-two.gif b/screenshots/two-plus-two.gif
new file mode 100644
index 0000000..b95dbe0
Binary files /dev/null and b/screenshots/two-plus-two.gif differ
diff --git a/spec/fixtures/slack/auth_test.yml b/spec/fixtures/slack/auth_test.yml
new file mode 100644
index 0000000..50f08fe
--- /dev/null
+++ b/spec/fixtures/slack/auth_test.yml
@@ -0,0 +1,103 @@
+---
+http_interactions:
+- request:
+    method: post
+    uri: https://slack.com/api/auth.test
+    body:
+      encoding: UTF-8
+      string: token=token
+    headers:
+      Accept:
+      - application/json; charset=utf-8
+      User-Agent:
+      - Slack Ruby Gem 1.1.1
+      Content-Type:
+      - application/x-www-form-urlencoded
+      Accept-Encoding:
+      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
+  response:
+    status:
+      code: 200
+      message: OK
+    headers:
+      Access-Control-Allow-Origin:
+      - '*'
+      Cache-Control:
+      - private, no-cache, no-store, must-revalidate
+      Content-Type:
+      - application/json; charset=utf-8
+      Date:
+      - Tue, 28 Apr 2015 12:55:23 GMT
+      Expires:
+      - Mon, 26 Jul 1997 05:00:00 GMT
+      Pragma:
+      - no-cache
+      Server:
+      - Apache
+      Strict-Transport-Security:
+      - max-age=31536000; includeSubDomains; preload
+      Vary:
+      - Accept-Encoding
+      X-Accepted-Oauth-Scopes:
+      - identify
+      X-Content-Type-Options:
+      - nosniff
+      X-Oauth-Scopes:
+      - identify,read,post,client
+      X-Xss-Protection:
+      - '0'
+      Content-Length:
+      - '128'
+      Connection:
+      - keep-alive
+    body:
+      encoding: UTF-8
+      string: '{"ok":true,"url":"https:\/\/math.slack.com\/","team":"calcteam","user":"calcuser","team_id":"TDEADBEEF","user_id":"UBAADFOOD"}'
+    http_version:
+  recorded_at: Tue, 28 Apr 2015 12:55:22 GMT
+- request:
+    method: post
+    uri: https://slack.com/api/rtm.start
+    body:
+      encoding: UTF-8
+      string: token=token
+    headers:
+      Accept:
+      - application/json; charset=utf-8
+      User-Agent:
+      - Slack Ruby Gem 1.1.1
+      Content-Type:
+      - application/x-www-form-urlencoded
+      Accept-Encoding:
+      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
+  response:
+    status:
+      code: 200
+      message: OK
+    headers:
+      Access-Control-Allow-Origin:
+      - '*'
+      Content-Type:
+      - application/json; charset=utf-8
+      Date:
+      - Tue, 28 Apr 2015 21:41:33 GMT
+      Server:
+      - Apache
+      Strict-Transport-Security:
+      - max-age=31536000; includeSubDomains; preload
+      Vary:
+      - Accept-Encoding
+      X-Content-Type-Options:
+      - nosniff
+      X-Xss-Protection:
+      - '0'
+      Content-Length:
+      - '55'
+      Connection:
+      - keep-alive
+    body:
+      encoding: UTF-8
+      string: '{"ok":false,"error":"invalid_auth"}'
+    http_version:
+  recorded_at: Tue, 28 Apr 2015 21:41:33 GMT
+recorded_with: VCR 2.9.3
diff --git a/spec/fixtures/slack/user_info.yml b/spec/fixtures/slack/user_info.yml
new file mode 100644
index 0000000..9751a21
--- /dev/null
+++ b/spec/fixtures/slack/user_info.yml
@@ -0,0 +1,59 @@
+---
+http_interactions:
+- request:
+    method: post
+    uri: https://slack.com/api/users.info
+    body:
+      encoding: UTF-8
+      string: token=token&user=user
+    headers:
+      Accept:
+      - application/json; charset=utf-8
+      User-Agent:
+      - Slack Ruby Gem 1.1.1
+      Content-Type:
+      - application/x-www-form-urlencoded
+      Accept-Encoding:
+      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
+  response:
+    status:
+      code: 200
+      message: OK
+    headers:
+      Access-Control-Allow-Origin:
+      - '*'
+      Cache-Control:
+      - private, no-cache, no-store, must-revalidate
+      Content-Type:
+      - application/json; charset=utf-8
+      Date:
+      - Wed, 29 Apr 2015 16:10:34 GMT
+      Expires:
+      - Mon, 26 Jul 1997 05:00:00 GMT
+      Pragma:
+      - no-cache
+      Server:
+      - Apache
+      Strict-Transport-Security:
+      - max-age=31536000; includeSubDomains; preload
+      Vary:
+      - Accept-Encoding
+      X-Accepted-Oauth-Scopes:
+      - read
+      X-Content-Type-Options:
+      - nosniff
+      X-Oauth-Scopes:
+      - identify,read,post,client
+      X-Xss-Protection:
+      - '0'
+      Content-Length:
+      - '448'
+      Connection:
+      - keep-alive
+    body:
+      encoding: UTF-8
+      string: '{"ok":true,"user":{"id":"U007","name":"username","deleted":false,"status":null,"color":"9f69e7","real_name":"","tz":"America\/Indiana\/Indianapolis","tz_label":"Eastern
+        Daylight Time","tz_offset":-14400,"profile":{"real_name":"","real_name_normalized":"","email":"dblock@dblock.org","image_24":"https:\/\/secure.gravatar.com\/avatar\/3d925b45ac07ec0ae5bd04888f6c5b61.jpg?s=24&d=https%3A%2F%2Fslack.global.ssl.fastly.net%2F3654%2Fimg%2Favatars%2Fava_0015-24.png","image_32":"https:\/\/secure.gravatar.com\/avatar\/3d925b45ac07ec0ae5bd04888f6c5b61.jpg?s=32&d=https%3A%2F%2Fslack.global.ssl.fastly.net%2F3654%2Fimg%2Favatars%2Fava_0015-32.png","image_48":"https:\/\/secure.gravatar.com\/avatar\/3d925b45ac07ec0ae5bd04888f6c5b61.jpg?s=48&d=https%3A%2F%2Fslack.global.ssl.fastly.net%2F3654%2Fimg%2Favatars%2Fava_0015-48.png","image_72":"https:\/\/secure.gravatar.com\/avatar\/3d925b45ac07ec0ae5bd04888f6c5b61.jpg?s=72&d=https%3A%2F%2Fslack.global.ssl.fastly.net%2F3654%2Fimg%2Favatars%2Fava_0015-72.png","image_192":"https:\/\/secure.gravatar.com\/avatar\/3d925b45ac07ec0ae5bd04888f6c5b61.jpg?s=192&d=https%3A%2F%2Fslack.global.ssl.fastly.net%2F272a%2Fimg%2Favatars%2Fava_0015.png"},"is_admin":true,"is_owner":true,"is_primary_owner":true,"is_restricted":false,"is_ultra_restricted":false,"is_bot":false,"has_files":false}}'
+    http_version:
+  recorded_at: Wed, 29 Apr 2015 16:10:34 GMT
+
diff --git a/spec/slack-mathbot/app_spec.rb b/spec/slack-mathbot/app_spec.rb
new file mode 100644
index 0000000..93a9fe5
--- /dev/null
+++ b/spec/slack-mathbot/app_spec.rb
@@ -0,0 +1,32 @@
+require 'spec_helper'
+
+describe SlackMathbot::App do
+  subject do
+    SlackMathbot::App.new
+  end
+  context 'not configured' do
+    before do
+      @slack_api_token = ENV.delete('SLACK_API_TOKEN')
+    end
+    after do
+      ENV['SLACK_API_TOKEN'] = @slack_api_token
+    end
+    it 'requires SLACK_API_TOKEN' do
+      expect { subject }.to raise_error RuntimeError, "Missing ENV['SLACK_API_TOKEN']."
+    end
+  end
+  context 'configured', vcr: { cassette_name: 'auth_test' } do
+    context 'run' do
+      before do
+        subject.send(:auth!)
+      end
+      it 'succeeds auth' do
+        expect(subject.config.url).to eq 'https://math.slack.com/'
+        expect(subject.config.team).to eq 'calcteam'
+        expect(subject.config.user).to eq 'calcuser'
+        expect(subject.config.team_id).to eq 'TDEADBEEF'
+        expect(subject.config.user_id).to eq 'UBAADFOOD'
+      end
+    end
+  end
+end
diff --git a/spec/slack-mathbot/commands/about_spec.rb b/spec/slack-mathbot/commands/about_spec.rb
new file mode 100644
index 0000000..6ca4b20
--- /dev/null
+++ b/spec/slack-mathbot/commands/about_spec.rb
@@ -0,0 +1,10 @@
+require 'spec_helper'
+
+describe SlackMathbot::Commands::Default do
+  it 'mathbot' do
+    expect(message: 'mathbot').to respond_with_slack_message(SlackMathbot::ABOUT)
+  end
+  it 'Mathbot' do
+    expect(message: 'Mathbot').to respond_with_slack_message(SlackMathbot::ABOUT)
+  end
+end
diff --git a/spec/slack-mathbot/commands/calculate_spec.rb b/spec/slack-mathbot/commands/calculate_spec.rb
new file mode 100644
index 0000000..5e8c5d4
--- /dev/null
+++ b/spec/slack-mathbot/commands/calculate_spec.rb
@@ -0,0 +1,16 @@
+require 'spec_helper'
+
+describe SlackMathbot::Commands::Calculate, vcr: { cassette_name: 'user_info' } do
+  it 'adds two numbers' do
+    expect(message: 'mathbot calculate 2+2', channel: 'channel').to respond_with_slack_message('4')
+  end
+  it 'adds two numbers via =' do
+    expect(message: '= 2+2', channel: 'channel').to respond_with_slack_message('4')
+  end
+  it 'adds two numbers via = without a space' do
+    expect(message: '=2+2', channel: 'channel').to respond_with_slack_message('4')
+  end
+  it 'sends something without an answer' do
+    expect(message: 'mathbot calculate pi', channel: 'channel').to respond_with_slack_message('Got nothing.')
+  end
+end
diff --git a/spec/slack-mathbot/commands/help_spec.rb b/spec/slack-mathbot/commands/help_spec.rb
new file mode 100644
index 0000000..0db53b4
--- /dev/null
+++ b/spec/slack-mathbot/commands/help_spec.rb
@@ -0,0 +1,7 @@
+require 'spec_helper'
+
+describe SlackMathbot::Commands::Help do
+  it 'help' do
+    expect(message: 'mathbot help').to respond_with_slack_message('See https://github.com/dblock/slack-mathbot, please.')
+  end
+end
diff --git a/spec/slack-mathbot/commands/hi_spec.rb b/spec/slack-mathbot/commands/hi_spec.rb
new file mode 100644
index 0000000..b6fb021
--- /dev/null
+++ b/spec/slack-mathbot/commands/hi_spec.rb
@@ -0,0 +1,7 @@
+require 'spec_helper'
+
+describe SlackMathbot::Commands::Hi do
+  it 'says hi' do
+    expect(message: 'mathbot hi').to respond_with_slack_message('Hi <@user>!')
+  end
+end
diff --git a/spec/slack-mathbot/commands/unknown_spec.rb b/spec/slack-mathbot/commands/unknown_spec.rb
new file mode 100644
index 0000000..a6330c4
--- /dev/null
+++ b/spec/slack-mathbot/commands/unknown_spec.rb
@@ -0,0 +1,11 @@
+require 'spec_helper'
+
+describe SlackMathbot::Commands::Unknown, vcr: { cassette_name: 'user_info' } do
+  it 'invalid command' do
+    expect(message: 'mathbot foobar').to respond_with_slack_message("Sorry <@user>, I don't understand that command!")
+  end
+  it 'does not respond to sad face' do
+    expect(SlackMathbot::Commands::Base).to_not receive(:send_message)
+    SlackMathbot::App.new.send(:message, text: ':((')
+  end
+end
diff --git a/spec/slack-mathbot/version_spec.rb b/spec/slack-mathbot/version_spec.rb
new file mode 100644
index 0000000..754c246
--- /dev/null
+++ b/spec/slack-mathbot/version_spec.rb
@@ -0,0 +1,7 @@
+require 'spec_helper'
+
+describe SlackMathbot do
+  it 'has a version' do
+    expect(SlackMathbot::VERSION).to_not be nil
+  end
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
new file mode 100644
index 0000000..ac07315
--- /dev/null
+++ b/spec/spec_helper.rb
@@ -0,0 +1,12 @@
+$LOAD_PATH.unshift(File.join(File.dirname(__FILE__), '..'))
+
+require 'rubygems'
+require 'rspec'
+require 'rack/test'
+
+require 'config/environment'
+require 'slack-mathbot'
+
+Dir[File.join(File.dirname(__FILE__), 'support', '**/*.rb')].each do |file|
+  require file
+end
diff --git a/spec/support/slack-mathbot/respond_with_error.rb b/spec/support/slack-mathbot/respond_with_error.rb
new file mode 100644
index 0000000..e35787c
--- /dev/null
+++ b/spec/support/slack-mathbot/respond_with_error.rb
@@ -0,0 +1,30 @@
+require 'rspec/expectations'
+
+RSpec::Matchers.define :respond_with_error do |expected|
+  match do |actual|
+    channel, user, message = parse(actual)
+    app = SlackMathbot::App.new
+    SlackMathbot.config.user = 'mathbot'
+    begin
+      expect do
+        app.send(:message, text: message, channel: channel, user: user)
+      end.to raise_error ArgumentError, expected
+    rescue RSpec::Expectations::ExpectationNotMetError => e
+      @error_message = e.message
+      raise e
+    end
+    true
+  end
+
+  failure_message do |actual|
+    _, _, message = parse(actual)
+    @error_message || "expected for '#{message}' to fail with '#{expected}'"
+  end
+
+  private
+
+  def parse(actual)
+    actual = { message: actual } unless actual.is_a?(Hash)
+    [actual[:channel] || 'channel', actual[:user] || 'user', actual[:message]]
+  end
+end
diff --git a/spec/support/slack-mathbot/respond_with_slack_message.rb b/spec/support/slack-mathbot/respond_with_slack_message.rb
new file mode 100644
index 0000000..cbfb68b
--- /dev/null
+++ b/spec/support/slack-mathbot/respond_with_slack_message.rb
@@ -0,0 +1,19 @@
+require 'rspec/expectations'
+
+RSpec::Matchers.define :respond_with_slack_message do |expected|
+  match do |actual|
+    channel, user, message = parse(actual)
+    app = SlackMathbot::App.new
+    SlackMathbot.config.user = 'mathbot'
+    expect(SlackMathbot::Commands::Base).to receive(:send_message).with(channel, expected)
+    app.send(:message, text: message, channel: channel, user: user)
+    true
+  end
+
+  private
+
+  def parse(actual)
+    actual = { message: actual } unless actual.is_a?(Hash)
+    [actual[:channel] || 'channel', actual[:user] || 'user', actual[:message]]
+  end
+end
diff --git a/spec/support/slack_api_key.rb b/spec/support/slack_api_key.rb
new file mode 100644
index 0000000..fdaff36
--- /dev/null
+++ b/spec/support/slack_api_key.rb
@@ -0,0 +1,5 @@
+RSpec.configure do |config|
+  config.before :all do
+    ENV['SLACK_API_TOKEN'] ||= 'test'
+  end
+end
diff --git a/spec/support/slack_calculator.rb b/spec/support/slack_calculator.rb
new file mode 100644
index 0000000..a80a44f
--- /dev/null
+++ b/spec/support/slack_calculator.rb
@@ -0,0 +1,4 @@
+SlackMathbot.configure do |config|
+  config.token = 'testtoken'
+  config.user = 'mathbot'
+end
diff --git a/spec/support/vcr.rb b/spec/support/vcr.rb
new file mode 100644
index 0000000..768541a
--- /dev/null
+++ b/spec/support/vcr.rb
@@ -0,0 +1,8 @@
+require 'vcr'
+
+VCR.configure do |config|
+  config.cassette_library_dir = 'spec/fixtures/slack'
+  config.hook_into :webmock
+  # config.default_cassette_options = { record: :new_episodes }
+  config.configure_rspec_metadata!
+end