prefer if let when possible

src/lib.rs

@@ -26,15 +26,10 @@ use std::sync::Arc;
 use std::sync::mpsc;
 use std::sync::mpsc::Sender;
 
-use std::rc::Rc;
-use std::cell::{Cell, RefCell};
-
 use transformable_channels::mpsc::TransformableSender;
 
 mod helpers;
 
-use std::collections::btree_set::BTreeSet;
-
 #[macro_use]
 extern crate log;
 
@@ -105,16 +100,14 @@ impl Tenquestionmarks {
                         let arc_envelope = Arc::new(envelope);
                         for (key, sender) in &module_senders {
                             let from_this = String::from(*key);
-                            match self.subscriptions.get::<String>(&from_this) {
-                                Some(subscription) => {
-                                    if subscription.can_handle_event(&arc_envelope) {
-                                        match sender.send(arc_envelope.clone()) {
-                                            Err(err) => debug!("Failed to dispatch event to module \"{}\": {:?}", key, err),
-                                            Ok(_) => {}
-                                        }
+                            if let Some(subscription) = self.subscriptions.get::<String>(&from_this) {
+                                if subscription.can_handle_event(&arc_envelope) {
+                                    if let Err(err) = sender.send(arc_envelope.clone()) {
+                                        debug!("Failed to dispatch event to module \"{}\": {:?}", key, err);
                                     }
-                                },
-                                None => debug!("Failed to dispatch event to module \"{}\": No such module found!", key)
+                                }
+                            } else {
+                                debug!("Failed to dispatch event to module \"{}\": No such module found!", key);
                             }
                         }
                     },

src/main.rs

@@ -32,35 +32,26 @@ fn main () {
     init_logger();
 
     let config_file_name = env::args().nth(1).unwrap_or("tenquestionmarks.toml".into());
-    match File::open(&config_file_name) {
-        Ok(mut file) => {
-            let mut contents = String::new();
-            match file.read_to_string(&mut contents) {
-                Ok(_) => {
-                    let mut parser = Parser::new(&contents);
-                    match parser.parse() {
-                        Some(configuration) => {
-                            info!("Loaded configuration from: {}", config_file_name);
-                            match Tenquestionmarks::from_configuration(configuration) {
-                                Ok(tqm) => {
-                                    info!("tenquestionmarks initialized successfully");
-                                    tqm.run();
-                                },
-                                Err(e) => error!("Failed to initialize tenquestionmarks: {:?}", e)
-                            }
-                        },
-                        None => {
-                            error!("Failed to parse config file {}: {:?}. Config file must be a valid TOML file.", config_file_name, parser.errors);
-                        }
-                    }
-                },
-                Err(e) => {
-                    error!("Failed to open config file {}: {:?}", config_file_name, e);
+    if let Ok(mut file) = File::open(&config_file_name) {
+        let mut contents = String::new();
+        if let Err(e) = file.read_to_string(&mut contents) {
+            error!("Failed to open config file {}: {:?}", config_file_name, e);
+        } else {
+            let mut parser = Parser::new(&contents);
+            if let Some(configuration) = parser.parse() {
+                info!("Loaded configuration from: {}", config_file_name);
+                match Tenquestionmarks::from_configuration(configuration) {
+                    Ok(tqm) => {
+                        info!("tenquestionmarks initialized successfully");
+                        tqm.run();
+                    },
+                    Err(e) => error!("Failed to initialize tenquestionmarks: {:?}", e)
                 }
+            } else {
+                error!("Failed to parse config file {}: {:?}. Config file must be a valid TOML file.", config_file_name, parser.errors);
             }
-        },
-        Err(_) => {
-            error!("Failed to open config file! Please specify path to a config file.");
         }
+    } else {
+        error!("Failed to open config file! Please specify path to a config file.");
     }
 }

src/modules/discord.rs

@@ -147,9 +147,8 @@ impl EventLoop for DiscordModule {
                         channel: discord.get_channel(message.channel_id).ok().and_then(|channel| make_channel_object(discord.clone(), channel))
                     };
 
-                    match sender.send(Envelope::new(event::Event::Message { message: message })) {
-                        Err(err) => error!("Error sending message event: {:?}", err),
-                        Ok(_) => {}
+                    if let Err(err) = sender.send(Envelope::new(event::Event::Message { message: message })) {
+                        error!("Error sending message event: {:?}", err)
                     }
                 }
     			Ok(_) => {}

tenquestionmarks.toml

@@ -85,4 +85,4 @@ end
 [autolink]
 
 [logger]
-filters = [{ username = "Dave" }]
+filters = [{ username = "Dave" }, { username = "Kevin" }]