Implement a basic help system.

blastmud_game/src/message_handler/user_commands.rs

@@ -62,7 +62,7 @@ pub async fn handle(session: &ListenerSession, msg: &str, pool: &DBPool) -> DRes
             match handler.handle(&VerbContext { session, pool }, cmd, params).await {
                 Ok(()) => {}
                 Err(UserError(err_msg)) => {
-                    pool.queue_for_session(session, &err_msg).await?;
+                    pool.queue_for_session(session, &(err_msg + "\r\n")).await?;
                 }
                 Err(SystemError(e)) => Err(e)?
             }

blastmud_game/src/message_handler/user_commands/help.rs

@@ -1,11 +1,31 @@
-use super::{VerbContext, UserVerb, UserVerbRef, UResult, user_error};
+use super::{
+    VerbContext, UserVerb, UserVerbRef, UResult,
+    CommandHandlingError::UserError
+};
 use async_trait::async_trait;
+use ansi_macro::ansi;
+use phf::phf_map;
+
+static HELP_PAGES: phf::Map<&'static str, &'static str> = phf_map! {
+    "" =>
+        ansi!("Type <bold>help <lt>topicname><reset> to learn about a topic. Most \
+          commands can be used as a topicname.\r\n\
+          Topics of interest to new users:\r\n\
+          \t<bold>register<reset>\tLearn about the <bold>register<reset> command.\r\n\
+          \t<bold>newbie<reset>\tLearn how to survive as a newb."),
+    "<topicname>" =>
+        ansi!("You are supposed to replace <lt>topicname> with the topic you want \
+         to learn about. Example:\r\n\
+         \t<bold>help register<reset> will tell you about the register command.")
+};
 
 pub struct Verb;
 #[async_trait]
 impl UserVerb for Verb {
     async fn handle(self: &Self, ctx: &VerbContext, _verb: &str, remaining: &str) -> UResult<()> {
-        user_error("Not implemented yet\r\n".to_string())?;
+        let help = HELP_PAGES.get(remaining).ok_or(
+            UserError("No help available on that".to_string()))?;
+        ctx.pool.queue_for_session(ctx.session, &(help.to_string() + "\r\n")).await?;
         Ok(())
     }
 }