戈朗 : How to disable automatically flag sorting?

Question

有了flag包，我们可以像这样指定一些命令行参数:

import "flag"
fun main() {
    from := flag.String("from", "", "the path to be copied")
    to := flag.String("to", "", "where the data copied to")
    ldb := flag.String("db", "./ldb", "the database path used during copy")
    pwd := flag.String("pwd", "", "password to encrypt your data, default no encryption on your data"
    flag.Parse()
    ...
}

当使用-h寻求帮助时，打印的消息似乎不是我提供的顺序:

-db string
    the database path used during copy (default "./ldb")
-from string
    the path to be copied
-pwd string
    password to encrypt your data, default no encryption on your data
-to string
    where the data copy to

顺序不直观，是否有其他选项可以告诉 Golang:不要自动对我的参数进行排序!？

Answer 1

输出按词法排序(https://golang.org/pkg/flag/#VisitAll):

VisitAll visits the command-line flags in lexicographical order, calling fn for each. It visits all flags, even those not set.

参见:https://golang.org/src/flag/flag.go#L435

您可以使用 flag.FlagSet 并使用自定义 Usage func()。