actually add random module

src/modules/random.rs

@@ -0,0 +1,60 @@
+use modules::Module;
+use toml::Table;
+
+use std::sync::mpsc::Receiver;
+use event::Event;
+
+use rand;
+
+pub struct RandomModule {
+    prefix: String,
+    responses: Vec<String>
+}
+
+impl RandomModule {
+    pub fn new (configuration: &Table) -> Box<Module> {
+        let prefix = configuration.get("prefix")
+                                  .and_then(|value| value.as_str())
+                                  .unwrap_or("!random ");
+
+        let responses = configuration.get("responses")
+                                     .and_then(|value| value.as_slice())
+                                     .map(|value| value.to_vec())
+                                     .unwrap_or(vec![])
+                                     .into_iter()
+                                     .map(|value| { String::from(value.as_str().unwrap()) })
+                                     .collect();
+
+        Box::new(RandomModule {
+            prefix: String::from(prefix),
+            responses: responses
+        })
+    }
+}
+
+impl Module for RandomModule {
+    fn consume_events (&self, receiver: Receiver<Event>) {
+        let mut rng = rand::thread_rng();
+
+        loop {
+            match receiver.recv() {
+                Ok(event) => {
+                    match event {
+                        Event::Message { content: message, channel, sender } => {
+                            if message.starts_with(self.prefix.as_str()) {
+                                let response = &rand::sample(&mut rng, &self.responses, 1)[0][..];
+                                
+                                match channel {
+                                    Some(channel) => channel.send(response),
+                                    None => sender.send(response)
+                                }
+                            }
+                        }
+                        _ => ()
+                    }
+                }
+                Err(error) => { }
+            }
+        }
+    }
+}