twpayne / go-difflib

Partial port of Python difflib package to Go

go-difflib

This is a fork of github.com/pmezard/go-difflib for use with github.com/twpayne/chezmoi. The upstream package is no longer maintained.

Go-difflib is a partial port of python 3 difflib package. Its main goal was to make unified and context diff available in pure Go, mostly for testing purposes.

The following class and functions (and related tests) have be ported:

• SequenceMatcher
• unified_diff()
• context_diff()

Installation

$ go get github.com/twpayne/go-difflib/difflib

Quick Start

Diffs are configured with Unified (or ContextDiff) structures, and can be output to an io.Writer or returned as a string.

diff := difflib.UnifiedDiff{
    A:        difflib.SplitLines("foo\nbar\n"),
    B:        difflib.SplitLines("foo\nbaz\n"),
    FromFile: "Original",
    ToFile:   "Current",
    Context:  3,
}
text, _ := difflib.GetUnifiedDiffString(diff)
fmt.Printf(text)

would output:

--- Original
+++ Current
@@ -1,3 +1,3 @@
 foo
-bar
+baz