diff

func Diff ¶

func Diff(prefix string, b1, b2 []byte) ([]byte, error)

Diff returns diff of two arrays of bytes in diff tool format.

func ReplaceTempFilename ¶

func ReplaceTempFilename(diff []byte, filename string) ([]byte, error)

ReplaceTempFilename replaces temporary filenames in diff with actual one.

ref: https://github.com/golang/tools/blob/master/cmd/goimports/goimports.go

Example:

--- /tmp/gofmt316145376	2017-02-03 19:13:00.280468375 -0500
+++ /tmp/gofmt617882815	2017-02-03 19:13:00.280468375 -0500
...
->
--- path/to/file.go.orig	2017-02-03 19:13:00.280468375 -0500
+++ path/to/file.go	2017-02-03 19:13:00.280468375 -0500
...