From 0aa94b84fd98f352d972edded44af3bc073cf998 Mon Sep 17 00:00:00 2001
From: Alexey Romanoff <ar@logiceditor.com>
Date: Fri, 10 Sep 2021 07:51:59 +0300
Subject: [PATCH] src/mobdebug.lua: fix cases when the server sends the data
 before the mobdebug starts to receive it

---
 src/mobdebug.lua | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/mobdebug.lua b/src/mobdebug.lua
index 36fa14c..a5b9d60 100644
--- a/src/mobdebug.lua
+++ b/src/mobdebug.lua
@@ -122,6 +122,8 @@ local step_level = 0
 local stack_level = 0
 local server
 local buf
+local start_input_line
+local start_input_error
 local outputs = {}
 local iobase = {print = print}
 local basedir = ""
@@ -778,7 +780,13 @@ local function debugger_loop(sev, svars, sfile, sline)
     local line, err
     if mobdebug.yield and server.settimeout then server:settimeout(mobdebug.yieldtimeout) end
     while true do
-      line, err = server:receive("*l")
+      if start_input_line then
+        line, err = start_input_line, start_input_error
+        start_input_line = nil
+        start_input_error = nil
+      else
+        line, err = server:receive("*l")
+      end
       if not line then
         if err == "timeout" then
           if mobdebug.yield then mobdebug.yield() end
@@ -1069,6 +1077,10 @@ local function start(controller_host, controller_port)
   local err
   server, err = mobdebug.connect(controller_host, controller_port)
   if server then
+    local line, receive_err = server:receive("*l")
+    start_input_line = line
+    start_input_error = receive_err
+
     -- correct stack depth which already has some calls on it
     -- so it doesn't go into negative when those calls return
     -- as this breaks subsequence checks in stack_depth().