func GenMarkdownTree(cmd *cobra.Command, dir string) error {
	identity := func(s string) string { return s }
	emptyStr := func(s string) string { return "" }
	return GenMarkdownTreeCustom(cmd, dir, emptyStr, identity)
}
GenMarkdownTree will generate a markdown page for this command and all
descendants in the directory given. The header may be nil.
This function may not work correctly if your command names have `-` in them.
If you have `cmd` with two subcmds, `sub` and `sub-third`,
and `sub` has a subcommand called `third`, it is undefined which
help output will be in the file `cmd-sub-third.1`.
package main
import (
	"bytes"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"sort"
	"strings"
	"time"
	"github.com/spf13/cobra"
)
func printOptions(buf *bytes.Buffer, cmd *cobra.Command) error {
	flags := cmd.NonInheritedFlags()
	flags.SetOutput(buf)
	if flags.HasAvailableFlags() {
		buf.WriteString("### Options\n\n```\n")
		flags.PrintDefaults()
		buf.WriteString("```\n\n")
	}
	parentFlags := cmd.InheritedFlags()
	parentFlags.SetOutput(buf)
	if parentFlags.HasAvailableFlags() {
		buf.WriteString("### Options inherited from parent commands\n\n```\n")
		parentFlags.PrintDefaults()
		buf.WriteString("```\n\n")
	}
	return nil
}
func GenMarkdownCustom(cmd *cobra.Command, w io.Writer, linkHandler func(string) string) error {
	cmd.InitDefaultHelpCmd()
	cmd.InitDefaultHelpFlag()
	buf := new(bytes.Buffer)
	name := cmd.CommandPath()
	short := cmd.Short
	long := cmd.Long
	if long == "" {
		long = short
	}
	buf.WriteString("## " + name + "\n\n")
	buf.WriteString(short + "\n\n")
	if len(cmd.Aliases) > 0 {
		buf.WriteString(fmt.Sprintf("***Aliases**: %s*\n\n", strings.Join(cmd.Aliases, ",")))
	}
	if cmd.Runnable() {
		buf.WriteString("### Usage\n\n")
		buf.WriteString(fmt.Sprintf("```\n%s\n```\n\n", cmd.UseLine()))
	}
	buf.WriteString("### Synopsis\n\n")
	buf.WriteString(long + "\n\n")
	if len(cmd.Example) > 0 {
		buf.WriteString("### Examples\n\n")
		buf.WriteString(fmt.Sprintf("%s\n\n", cmd.Example))
	}
	if err := printOptions(buf, cmd); err != nil {
		return err
	}
	if hasSeeAlso(cmd) {
		buf.WriteString("### SEE ALSO\n\n")
		if cmd.HasParent() {
			parent := cmd.Parent()
			pname := parent.CommandPath()
			link := pname + ".md"
			link = strings.Replace(link, " ", "_", -1)
			buf.WriteString(fmt.Sprintf("* [%s](%s)\t - %s\n", pname, linkHandler(link), parent.Short))
			cmd.VisitParents(func(c *cobra.Command) {
				if c.DisableAutoGenTag {
					cmd.DisableAutoGenTag = c.DisableAutoGenTag
				}
			})
		}
		children := cmd.Commands()
		sort.Sort(byName(children))
		for _, child := range children {
			if !child.IsAvailableCommand() || child.IsAdditionalHelpTopicCommand() {
				continue
			}
			cname := name + " " + child.Name()
			link := cname + ".md"
			link = strings.Replace(link, " ", "_", -1)
			buf.WriteString(fmt.Sprintf("* [%s](%s)\t - %s\n", cname, linkHandler(link), child.Short))
		}
		buf.WriteString("\n")
	}
	if !cmd.DisableAutoGenTag {
		buf.WriteString("###### Auto generated by spf13/cobra on " + time.Now().Format("2-Jan-2006") + "\n")
	}
	_, err := buf.WriteTo(w)
	return err
}