我们使用 git 做 Go 源码的版本控制，在提交前，我们需要对代码自动格式，并且当未格式的时候，输出一些信息，下面是一个这样的脚本：

注：该脚本来源于：http://golang.org/misc/git/pre-commit
关于介绍清理 Go 代码的小文章：An Introduction to Go Tools and Clean Code

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    #!/bin/sh
        # Copyright 2012 The Go Authors. All rights reserved.
        # Use of this source code is governed by a BSD-style
        # license that can be found in the LICENSE file.
        # git gofmt pre-commit hook
        #
        # To use, store as .git/hooks/pre-commit inside your repository and make sure
        # it has execute permissions.
        #
        # This script does not handle file names that contain spaces.
        gofiles=$(git diff --cached --name-only --diff-filter=ACM | grep '.go$')
        [ -z "$gofiles" ] && exit 0
        unformatted=$(gofmt -l $gofiles)
        [ -z "$unformatted" ] && exit 0
        # Some files are not gofmt'd. Print message and fail.
        echo >&2 "Go files must be formatted with gofmt. Please run:"
        for fn in $unformatted; do
            echo >&2 "  gofmt -w $PWD/$fn"
        done
        exit 1