From 3f82d96b8e23dec2743bcca5f798af26f023123a Mon Sep 17 00:00:00 2001
From: XeonSquared <redtailedairways@gmail.com>
Date: Sun, 21 Jun 2020 18:26:10 +1000
Subject: [PATCH] buffer history now: can't go out of bounds, can go to an
 empty line once you go past the most recent

---
 module/buffer.lua | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/module/buffer.lua b/module/buffer.lua
index 6acf1b6..b6805a3 100644
--- a/module/buffer.lua
+++ b/module/buffer.lua
@@ -294,9 +294,14 @@ function buffer:read(...)
       elseif char == "B" then -- down
        hIndex = hIndex - 1
        io.write("\27[u"..(" "):rep(buffer:len()+1))
+       if hIndex == 0 then
+        hIndex = hIndex - 1
+        buffer = ""
+       end
        buffer = self.history[1+#self.history-hIndex] or buffer
        pos = 1
       end
+      hIndex = math.max(math.min(hIndex,#self.history),0)
      end
     elseif char == "\8" then
      if #buffer > 0 and pos <= #buffer then