implement server-local VERSION response (#98)

sable_ircd/src/command/handlers/version.rs

@@ -0,0 +1,16 @@
+use super::*;
+
+#[command_handler("VERSION")]
+fn handle_version(server: &ClientServer, response: &dyn CommandResponse) -> CommandResult {
+    response.numeric(make_numeric!(
+        Version,
+        server.name(),
+        server.node().version()
+    ));
+
+    for v in server.isupport.data().iter() {
+        response.numeric(make_numeric!(ISupport, v))
+    }
+
+    Ok(())
+}

sable_ircd/src/command/mod.rs

@@ -63,6 +63,7 @@ mod handlers {
     mod rename;
     mod topic;
     mod user;
+    mod version;
     mod userhost;
     mod who;
     mod whois;

sable_ircd/src/messages/numeric.rs

@@ -11,6 +11,8 @@ define_messages! {
                                                 => "{server_name} {version} {user_modes} {chan_modes} {chan_modes_with_a_parameter}" },
     005(ISupport)   => { (data: &str)                           => "{data} :are supported by this server" },
 
+    351(Version)    => { (server_name: &ServerName, version: &str) => "{server_name} {version}: Sable IRCd"},
+
     221(UserModeIs)             => { (modestring: &str)         => ":{modestring}" },
     301(Away)                   => { (nick: &User.nick(), reason: &AwayReason)  => "{nick} :{reason}" },
     302(Userhost)               => { (reply: &str)              => ":{reply}" },

sable_ircd/src/server/mod.rs

@@ -83,7 +83,7 @@ pub struct ClientServer {
 
     auth_client: AuthClient,
     myinfo: MyInfo,
-    isupport: ISupportBuilder,
+    pub isupport: ISupportBuilder,
     client_caps: CapabilityRepository,
 
     node: Arc<NetworkNode>,