2 files changed, 28 insertions, 0 deletions
diff --git a/src/util/util.go b/src/util/util.go
index 95c4e1b4..0aa1d804 100644
--- a/src/util/util.go
+++ b/src/util/util.go
@@ -112,3 +112,13 @@ func DurWithin(
 func IsTty() bool {
 	return isatty.IsTerminal(os.Stdin.Fd())
 }
+
+// Once returns a function that returns the specified boolean value only once
+func Once(nextResponse bool) func() bool {
+	state := nextResponse
+	return func() bool {
+		prevState := state
+		state = false
+		return prevState
+	}
+}
diff --git a/src/util/util_test.go b/src/util/util_test.go
index d6a03d9d..4baa56fb 100644
--- a/src/util/util_test.go
+++ b/src/util/util_test.go
@@ -20,3 +20,21 @@ func TestContrain(t *testing.T) {
 		t.Error("Expected", 3)
 	}
 }
+
+func TestOnce(t *testing.T) {
+	o := Once(false)
+	if o() {
+		t.Error("Expected: false")
+	}
+	if o() {
+		t.Error("Expected: false")
+	}
+
+	o = Once(true)
+	if !o() {
+		t.Error("Expected: true")
+	}
+	if o() {
+		t.Error("Expected: false")
+	}
+}