Add networkinfo:nick_chars option to allow configuring additional characters allowed in nicknames

data/example.conf

@@ -319,6 +319,16 @@ networkinfo
 	 */
 	modelistsize = 100
 
+	/*
+	 * Characters allowed in nicknames. This always includes the characters described
+	 * in RFC1459, and so does not need to be set for normal behavior. Changing this to
+	 * include characters your IRCd doesn't support will cause your IRCd and/or Services
+	 * to break. Multibyte characters are not supported, nor are escape sequences.
+	 *
+	 * It is recommended you DON'T change this.
+	 */
+	#nick_chars = ""
+
 	/*
 	 * The characters allowed in hostnames. This is used for validating hostnames given
 	 * to services, such as BotServ bot hostnames and user vhosts. Changing this is not

include/config.h

@@ -103,6 +103,8 @@ namespace Configuration
 		time_t TimeoutCheck;
 		/* options:usestrictprivmsg */
 		bool UseStrictPrivmsg;
+		/* networkinfo:nickchars */
+		Anope::string NickChars;
 
 		/* either "/msg " or "/" */
 		Anope::string StrictPrivmsg;

src/config.cpp

@@ -191,6 +191,7 @@ Conf::Conf() : Block("")
 	}
 	this->DefLanguage = options->Get<const Anope::string>("defaultlanguage");
 	this->TimeoutCheck = options->Get<time_t>("timeoutcheck");
+	this->NickChars = networkinfo->Get<Anope::string>("nick_chars");
 
 	for (int i = 0; i < this->CountBlock("uplink"); ++i)
 	{

src/protocol.cpp

@@ -365,8 +365,10 @@ bool IRCDProto::IsNickValid(const Anope::string &nick)
 	Anope::string special = "[]\\`_^{|}";
 	
 	for (unsigned i = 0; i < nick.length(); ++i)
-		if (!(nick[i] >= 'A' && nick[i] <= 'Z') && !(nick[i] >= 'a' && nick[i] <= 'z') && special.find(nick[i]) == Anope::string::npos
-		&& (!i || (!(nick[i] >= '0' && nick[i] <= '9') && nick[i] != '-')))
+		if (!(nick[i] >= 'A' && nick[i] <= 'Z') && !(nick[i] >= 'a' && nick[i] <= 'z')
+		  && special.find(nick[i]) == Anope::string::npos
+		  && (Config && Config->NickChars.find(nick[i]) == Anope::string::npos)
+		  && (!i || (!(nick[i] >= '0' && nick[i] <= '9') && nick[i] != '-')))
 			return false;
 	
 	return true;