Now with animated GIFs.

DEPLOYMENT.md

@@ -20,6 +20,10 @@ Set SLACK_API_TOKEN from the Bot integration settings on Slack.
 heroku config:add SLACK_API_TOKEN=...
 ```
 
+#### GIPHY_API_KEY
+
+Slack-Gamebot replies with animated GIFs. While it's currently not necessary, uyou may need to set GIPHY_API_KEY in the future, see [github.com/Giphy/GiphyAPI](https://github.com/Giphy/GiphyAPI) for details.
+
 ### 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.
+Heroku free tier applications will idle. Either pay 7$ a month for the hobby dyno or use [UptimeRobot](http://uptimerobot.com) or similar to prevent your instance from sleeping or pay for a production dyno.

Gemfile

@@ -8,6 +8,7 @@ gem 'puma'
 gem 'sinatra'
 gem 'activesupport'
 gem 'dentaku'
+gem 'giphy', '~> 2.0.2'
 
 group :development, :test do
   gem 'rake', '~> 10.4'

Gemfile.lock

@@ -20,17 +20,29 @@ GEM
       multipart-post (>= 1.2, < 3)
     faraday_middleware (0.9.1)
       faraday (>= 0.7.4, < 0.10)
+    faraday_middleware-parse_oj (0.3.0)
+      faraday (~> 0.9.0)
+      faraday_middleware (~> 0.9.1)
+      oj (~> 2.0)
     faye-websocket (0.9.2)
       eventmachine (>= 0.12.0)
       websocket-driver (>= 0.5.1)
     foreman (0.78.0)
       thor (~> 0.19.1)
+    giphy (2.0.2)
+      faraday (~> 0.9)
+      faraday_middleware (~> 0.9)
+      faraday_middleware-parse_oj (~> 0.3)
+      launchy (~> 2.4)
     hashie (3.4.1)
     i18n (0.7.0)
     json (1.8.2)
+    launchy (2.4.3)
+      addressable (~> 2.3)
     minitest (5.6.1)
     multi_json (1.11.0)
     multipart-post (2.0.0)
+    oj (2.12.9)
     parser (2.3.0.pre.2)
       ast (>= 1.1, < 3.0)
     powerpack (0.1.1)
@@ -93,6 +105,7 @@ DEPENDENCIES
   activesupport
   dentaku
   foreman
+  giphy (~> 2.0.2)
   hashie
   puma
   rack-test (~> 0.6.2)

README.md

@@ -17,6 +17,8 @@ On the next screen, note the API token.
 
 Run `SLACK_API_TOKEN=<your API token> foreman start`
 
+While it's currently not necessary, uyou may need to set _GIPHY_API_KEY_ in the future, see [github.com/Giphy/GiphyAPI](https://github.com/Giphy/GiphyAPI) for details.
+
 ## Production Deployment
 
 See [DEPLOYMENT](DEPLOYMENT.md).

app/slack-mathbot/commands/about.rb

@@ -2,7 +2,7 @@ module SlackMathbot
   module Commands
     class Default < Base
       def self.call(data, _command, _arguments)
-        send_message data.channel, SlackMathbot::ABOUT
+        send_message_with_gif data.channel, SlackMathbot::ABOUT, 'math'
       end
     end
   end

app/slack-mathbot/commands/base.rb

@@ -5,6 +5,17 @@ module SlackMathbot
         Slack.chat_postMessage(channel: channel, text: text)
       end
 
+      def self.send_message_with_gif(channel, text, keywords)
+        gif = begin
+          Giphy.random(keywords)
+        rescue StandardError => e
+          logger.warn "Giphy.random: #{e.message}"
+          nil
+        end
+        text = text + "\n" + gif.image_url.to_s if gif
+        send_message channel, text
+      end
+
       def self.logger
         @logger ||= begin
           $stdout.sync = true

app/slack-mathbot/commands/calculate.rb

@@ -2,8 +2,15 @@ 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
+        result = Dentaku::Calculator.new.evaluate(arguments.join)
+        result = result.to_s if result
+        if result && result.length > 0
+          send_message data.channel, result
+        else
+          send_message_with_gif data.channel, 'Got nothing.', 'nothing'
+        end
+      rescue StandardError => e
+        send_message_with_gif data.channel, "Sorry, #{e.message}.", 'idiot'
       end
     end
   end

app/slack-mathbot/commands/help.rb

@@ -2,7 +2,7 @@ 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.'
+        send_message_with_gif data.channel, 'See https://github.com/dblock/slack-mathbot, please.', 'help'
       end
     end
   end

app/slack-mathbot/commands/hi.rb

@@ -2,7 +2,7 @@ module SlackMathbot
   module Commands
     class Hi < Base
       def self.call(data, _command, _arguments)
-        send_message data.channel, "Hi <@#{data.user}>!"
+        send_message_with_gif data.channel, "Hi <@#{data.user}>!", 'hi'
       end
     end
   end

app/slack-mathbot/commands/unknown.rb

@@ -2,7 +2,7 @@ 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!"
+        send_message_with_gif data.channel, "Sorry <@#{data.user}>, I don't understand that command!", 'idiot'
       end
     end
   end

config/initializers/giphy.rb

@@ -0,0 +1,3 @@
+Giphy::Configuration.configure do |config|
+  config.api_key = ENV['GIPHY_API_KEY'] || 'dc6zaTOxFJmzC' # from https://github.com/Giphy/GiphyAPI
+end

spec/slack-mathbot/commands/calculate_spec.rb

@@ -13,4 +13,7 @@ describe SlackMathbot::Commands::Calculate, vcr: { cassette_name: 'user_info' }
   it 'sends something without an answer' do
     expect(message: 'mathbot calculate pi', channel: 'channel').to respond_with_slack_message('Got nothing.')
   end
+  it 'reports division by zero' do
+    expect(message: 'mathbot calculate 1/0', channel: 'channel').to respond_with_slack_message('Sorry, divided by 0.')
+  end
 end

spec/support/slack-mathbot/respond_with_error.rb

@@ -5,6 +5,7 @@ RSpec::Matchers.define :respond_with_error do |expected|
     channel, user, message = parse(actual)
     app = SlackMathbot::App.new
     SlackMathbot.config.user = 'mathbot'
+    allow(Giphy).to receive(:random)
     begin
       expect do
         app.send(:message, text: message, channel: channel, user: user)

spec/support/slack-mathbot/respond_with_slack_message.rb

@@ -5,6 +5,7 @@ RSpec::Matchers.define :respond_with_slack_message do |expected|
     channel, user, message = parse(actual)
     app = SlackMathbot::App.new
     SlackMathbot.config.user = 'mathbot'
+    allow(Giphy).to receive(:random)
     expect(SlackMathbot::Commands::Base).to receive(:send_message).with(channel, expected)
     app.send(:message, text: message, channel: channel, user: user)
     true