mirror of https://github.com/perkeep/perkeep.git
53 lines
1.2 KiB
Go
53 lines
1.2 KiB
Go
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/*
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Copyright 2013 The Camlistore Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package test
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import (
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"bytes"
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"io/ioutil"
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"os"
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"os/exec"
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)
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// Diff returns the unified diff (from running "diff -u") or
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// returns an error string.
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func Diff(a, b []byte) string {
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if bytes.Equal(a, b) {
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return ""
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}
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ta, err := ioutil.TempFile("", "")
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if err != nil {
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return err.Error()
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}
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tb, err := ioutil.TempFile("", "")
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if err != nil {
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return err.Error()
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}
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defer os.Remove(ta.Name())
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defer os.Remove(tb.Name())
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// Lqzy...
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ta.Write(a)
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tb.Write(b)
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ta.Close()
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tb.Close()
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out, err := exec.Command("diff", "-u", ta.Name(), tb.Name()).CombinedOutput()
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if err != nil && len(out) == 0 {
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return err.Error()
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}
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return string(out)
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}
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