From 1938e659ab67ac67942be163d77669ff70cf34c2 Mon Sep 17 00:00:00 2001
From: mappu <mappu04@gmail.com>
Date: Tue, 11 Jul 2017 18:07:55 +1200
Subject: [PATCH] diff: remove some empty ins/del instructions

---
 diff/diff.go | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/diff/diff.go b/diff/diff.go
index 9fcb02b..6b317d8 100644
--- a/diff/diff.go
+++ b/diff/diff.go
@@ -49,6 +49,12 @@ func Diff(o, n []string) []Instruction {
 	if len(o) == 0 && len(n) == 0 {
 		return []Instruction{}
 	}
+	if len(o) == 0 {
+		return []Instruction{{OP_INSERTED, n}}
+	}
+	if len(n) == 0 {
+		return []Instruction{{OP_REMOVED, o}}
+	}
 
 	maxl := 0
 	omax := 0
@@ -79,8 +85,8 @@ func Diff(o, n []string) []Instruction {
 
 	if maxl == 0 {
 		return []Instruction{
-			Instruction{OP_REMOVED, o},
-			Instruction{OP_INSERTED, n},
+			{OP_REMOVED, o},
+			{OP_INSERTED, n},
 		}
 	}