From 94333154645bd6f9460c5eb92521a318b3bca07b Mon Sep 17 00:00:00 2001
From: Andrew Stone <a@stne.dev>
Date: Thu, 25 Jan 2024 13:47:55 -0800
Subject: [PATCH] stack: Add IsZero

---
 callstack/stack.go      | 5 +++++
 callstack/stack_test.go | 5 ++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/callstack/stack.go b/callstack/stack.go
index fa4ccc3..0982312 100644
--- a/callstack/stack.go
+++ b/callstack/stack.go
@@ -35,6 +35,11 @@ func GetSkip(skip int) Stack {
 	}
 }
 
+// IsZero determines if this stack is a zero-value
+func (st Stack) IsZero() bool {
+	return len(st.s) == 0
+}
+
 // A shallow wrapper around [runtime.CallersFrames]
 func (st Stack) CallersFrames() *runtime.Frames {
 	return runtime.CallersFrames(st.s)
diff --git a/callstack/stack_test.go b/callstack/stack_test.go
index a630b38..a2364be 100644
--- a/callstack/stack_test.go
+++ b/callstack/stack_test.go
@@ -48,7 +48,10 @@ func TestStackIters(t *testing.T) {
 
 func TestStackString(t *testing.T) {
 	c := check.NewT(t)
-	c.Equal(Stack{}.String(), "")
+
+	var stack Stack
+	c.True(stack.IsZero())
+	c.Equal(stack.String(), "")
 }
 
 func BenchmarkGet(b *testing.B) {