From a192249c77f09b601e71fe1c746bf9ea70f7c534 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Wed, 31 Aug 2022 19:33:28 -0700
Subject: [PATCH] circbuf rotateToZero does nothing if its already at zero

---
 src/terminal/circ_buf.zig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/terminal/circ_buf.zig b/src/terminal/circ_buf.zig
index af26c1a4b..12259ee7e 100644
--- a/src/terminal/circ_buf.zig
+++ b/src/terminal/circ_buf.zig
@@ -70,6 +70,9 @@ pub fn CircBuf(comptime T: type, comptime default: T) type {
             // TODO: this does this in the worst possible way by allocating.
             // rewrite to not allocate, its possible, I'm just lazy right now.
 
+            // If we're already at zero then do nothing.
+            if (self.tail == 0) return;
+
             var buf = try alloc.alloc(T, self.storage.len);
             defer {
                 self.head = if (self.full) 0 else self.len();