2 files changed, 50 insertions, 0 deletions
diff --git a/internal/strutil/strutil.go b/internal/strutil/strutil.go
index b1de241f..30fa260a 100644
--- a/internal/strutil/strutil.go
+++ b/internal/strutil/strutil.go
@@ -44,3 +44,13 @@ func RandomChars(n int) (string, error) {
 
 	return string(buffer), nil
 }
+
+// Ellipsis returns a truncated string and appends "..." to the end of the
+// string if the string length is larger than the threshold. Otherwise, the
+// original string is returned.
+func Ellipsis(str string, threshold int) string {
+	if len(str) <= threshold || threshold < 0 {
+		return str
+	}
+	return str[:threshold] + "..."
+}
diff --git a/internal/strutil/strutil_test.go b/internal/strutil/strutil_test.go
index c4edf140..8a2fed75 100644
--- a/internal/strutil/strutil_test.go
+++ b/internal/strutil/strutil_test.go
@@ -55,3 +55,43 @@ func TestRandomChars(t *testing.T) {
 		cache[chars] = true
 	}
 }
+
+func TestEllipsis(t *testing.T) {
+	tests := []struct {
+		name      string
+		str       string
+		threshold int
+		want      string
+	}{
+		{
+			name:      "empty string and zero threshold",
+			str:       "",
+			threshold: 0,
+			want:      "",
+		},
+		{
+			name:      "smaller length than threshold",
+			str:       "ab",
+			threshold: 3,
+			want:      "ab",
+		},
+		{
+			name:      "same length as threshold",
+			str:       "abc",
+			threshold: 3,
+			want:      "abc",
+		},
+		{
+			name:      "greater length than threshold",
+			str:       "ab",
+			threshold: 1,
+			want:      "a...",
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			got := Ellipsis(test.str, test.threshold)
+			assert.Equal(t, test.want, got)
+		})
+	}
+}