From 5808377085c37b32c95279c607dd9ffce11c2316 Mon Sep 17 00:00:00 2001
From: Rachel Blackman <pax@Profile.local>
Date: Sun, 4 Jun 2017 18:46:31 -0700
Subject: [PATCH] Change IAC + GA to key off of MUDPROMPT @option

Several clients interpret IAC + GA as a linefeed, in order
to support MUDs that always end a line with them.  This causes
Evennia to spew empty lines everywhere if IAC + GA is always on.
---
 evennia/server/inputfuncs.py    | 3 ++-
 evennia/server/portal/telnet.py | 4 +++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/evennia/server/inputfuncs.py b/evennia/server/inputfuncs.py
index 17442ba6e..509d84be4 100644
--- a/evennia/server/inputfuncs.py
+++ b/evennia/server/inputfuncs.py
@@ -193,7 +193,8 @@ def client_options(session, *args, **kwargs):
                            "UTF-8", "SCREENREADER", "ENCODING",
                            "MCCP", "SCREENHEIGHT",
                            "SCREENWIDTH", "INPUTDEBUG",
-                           "RAW", "NOCOLOR"))
+                           "RAW", "NOCOLOR",
+                           "MUDPROMPT"))
         session.msg(client_options=options)
         return
 
diff --git a/evennia/server/portal/telnet.py b/evennia/server/portal/telnet.py
index dbccf5e5b..e9f43443d 100644
--- a/evennia/server/portal/telnet.py
+++ b/evennia/server/portal/telnet.py
@@ -221,7 +221,9 @@ class TelnetProtocol(Telnet, StatefulTelnetProtocol, Session):
         # escape IAC in line mode, and correctly add \r\n
         line += self.delimiter
         line = line.replace(IAC, IAC + IAC).replace('\n', '\r\n')
-        return self.transport.write(mccp_compress(self, line + IAC + GA))
+        if self.protocol_flags.get("MUDPROMPT", False):
+            line = line + IAC + GA
+        return self.transport.write(mccp_compress(self, line))
 
     # Session hooks