Initial commit

vendor/github.com/hawkingrei/kazel/diff.go

@@ -0,0 +1,60 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"io/ioutil"
+	"os"
+	"os/exec"
+)
+
+// Diff prints the unified diff of the two provided byte slices
+// using the unix diff command.
+func Diff(left, right []byte) error {
+	lf, err := ioutil.TempFile("/tmp", "actual-file-")
+	if err != nil {
+		return err
+	}
+	defer lf.Close()
+	defer os.Remove(lf.Name())
+
+	rf, err := ioutil.TempFile("/tmp", "expected-file-")
+	if err != nil {
+		return err
+	}
+	defer rf.Close()
+	defer os.Remove(rf.Name())
+
+	_, err = lf.Write(left)
+	if err != nil {
+		return err
+	}
+	lf.Close()
+
+	_, err = rf.Write(right)
+	if err != nil {
+		return err
+	}
+	rf.Close()
+
+	cmd := exec.Command("/usr/bin/diff", "-u", lf.Name(), rf.Name())
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	cmd.Run()
+
+	return nil
+}