From 9b82e7bb0c944199d03b06846d2cd7075cf19158 Mon Sep 17 00:00:00 2001
From: Till Hoeppner
Date: Sun, 28 Jun 2015 20:04:31 +0200
Subject: Comment the example bot 02 and change its configuration

---
 examples/02.rs | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 57 insertions(+), 5 deletions(-)

(limited to 'examples')

diff --git a/examples/02.rs b/examples/02.rs
index ca5cfc4..a562249 100644
--- a/examples/02.rs
+++ b/examples/02.rs
@@ -1,5 +1,6 @@
 extern crate irsc;
 extern crate openssl;
+extern crate env_logger;
 
 use irsc::*;
 use irsc::Command::*;
@@ -7,34 +8,85 @@ use irsc::Reply::*;
 
 use openssl::ssl::{ Ssl, SslContext, SslMethod };
 
+// Here should be the constants of this bot, like the nickname or description,
+// to avoid repetition. However, for better readability, the constants have been
+// inlined below.
+
 fn main() {
+    // If the environment variable RUST_LOG is set to "info",
+    // irsc will log incoming and outgoing data in raw form.
+    env_logger::init().ok().expect("Failed to initialise env_logger");
+
     let mut s = OwnedClient::new();
+    // Try to use Tlsv1 to connect. This might fail, depending on your version of
+    // OpenSSL. This example does not try with other methods on failure.
     let ssl = Ssl::new(&SslContext::new(SslMethod::Tlsv1).unwrap()).unwrap();
-    s.connect_ssl("irc.rizon.net", 6697, ssl);
-    s.register("irsc", "irsc", "Testing for kori", None);
 
+    // Connect using the newly constructed Ssl configuration.
+    // If Ssl is not desired, use .connect(...) without the ssl argument.
+    s.connect_ssl("irc.mozilla.org", 6697, ssl);
+    // Send the USER and NICK message in one go,
+    // <nick> <user> <description> <optional password>
+    s.register("irsc02", "irsc", "Example bot 02", None);
+
+    // The client must be accessible from anywh when using the Event API.
+    // .into_shared() will convert the previously owned client into a wrapper.
     let mut shared = s.into_shared();
+
+    // `shared.commands()` will return a carboxyl stream of tuples of the form
+    // (SharedClient, Message, Command), representing the incoming Commands.
+    // Event streams are not lazy, but they must still be alive when the events happen,
+    // in order to process them. To keep them alive (prevent dropping), we assing them
+    // to local variables. Make sure to not ignore (variable name `_`) them, as that
+    // drops them as well. The leading underscore will avoid unused-variable warnings.
     let _a = shared.commands()
         .map(|(mut cl, msg, c)| {
+            // PRIVMSGs are the most common way to talk, they are used in queries but also
+            // to talk in channels (despite the "PRIV"). This if-let makes sure we only handle
+            // these PRIVMSG events for now, and allows us to access PRIVMSG-specific information,
+            // like the addressee of the message and its content.
             if let PRIVMSG(to, content) = c {
+                // The ident is unique to the origin of this message, and can be used
+                // to retrieve the nickname of the sender. This example assumes all
+                // hostmasks are well formed and always present.
                 let from = msg.ident().unwrap();
+                // This example will echo the input if the bot was mentioned.
+                // Example:
+                //   tilpner told me: irsc - Foo!
+                // if "tilpner" wrote "irsc - Foo!" before.
                 let response = format!("{} told me: {}", from.nickname, color::bold(&content));
 
-                // only send to global channels, to prevent recursion when we are pm'ed
-                // technically, there are other prefixes than '#', but ignoring them is fine
+                // Only send to global channels, to prevent recursion when we are pm'ed.
+                // Technically, there are other prefixes than '#', but ignoring them is fine here.
+                // Also, we only reply if we were mentioned at the start of the message.
                 if to.starts_with("#") && content.starts_with("irsc") {
+                    // `to` is not the nick who mentioned us, but the channel we were mentioned in,
+                    // This will send our `response` to that channel.
                     cl.msg(&to, &response);
                 }
             }
         });
 
+    // `shared.replies()` will return a carboxyl stream of tuples of the form
+    // (SharedClient, Message, Reply), representing the incoming Replies.
+    // Again, make sure to keep the mapped stream alive.
     let _b = shared.replies()
         .map(|(mut cl, _msg, r)| {
+            // Logging into the IRC server might take some seconds. Some libraries solve
+            // this by having a fixed timeout after they logged in, before they continue
+            // to e.g. join channels or identify with the services.
+            // There is a more precise way, namely waiting for the RPL_WELCOME event (001),
+            // that is sent by the IRCd after we've connected successfully.
             if let RPL_WELCOME(_) = r {
+                // After we've connected successfully, we join a channel
+                // without providing a password.
                 cl.join("#meep!", None);
             }
         });
 
-    // Dedicate this thread to listening and event processing
+    // Dedicate this thread to listening and event processing.
+    // This method will only return after the connection has been closed or an
+    // error was encountered, which is why it should either listen in a new thread,
+    // or all necessary setup must be done prior to calling this method.
     shared.listen_with_events();
 }
-- 
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