spf13--cobra/md_docs.md

# Generating Markdown Docs For Your Own cobra.Command

## Generate markdown docs for the entire command tree

This program can actually generate docs for the kubectl command in the kubernetes project

```go
package main

import (
	"io/ioutil"
	"os"

	"github.com/GoogleCloudPlatform/kubernetes/pkg/kubectl/cmd"
	"github.com/spf13/cobra"
)

func main() {
	kubectl := cmd.NewFactory(nil).NewKubectlCommand(os.Stdin, ioutil.Discard, ioutil.Discard)
	cobra.GenMarkdownTree(kubectl, "./")
}
```

This will generate a whole series of files, one for each command in the tree, in the directory specified (in this case "./")

## Generate markdown docs for a single command

You may wish to have more control over the output, or only generate for a single command, instead of the entire command tree. If this is the case you may prefer to `GenMarkdown` instead of `GenMarkdownTree`

```go
	out := new(bytes.Buffer)
	cobra.GenMarkdown(cmd, out)
```

This will write the markdown doc for ONLY "cmd" into the out, buffer.

## Customize the output

Both `GenMarkdown` and `GenMarkdownTree` has alternate versions with callbacks to get some control of the output:

```go
func GenMarkdownTreeCustom(cmd *Command, dir string, filePrepender func(string) string, linkHandler func(string) string) {
    //...
}
```

```go
func GenMarkdownCustom(cmd *Command, out *bytes.Buffer, linkHandler func(string) string) {
    //...
}
```

The `filePrepender` will prepend the return value given the full filepath to the rendered Markdown file. A common use case is to add front matter to use the generated documentation with [Hugo](http://gohugo.io/):

```go
const fmTemplate = `---
date: %s
title: "%s"
slug: %s
url: %s
---
`

filePrepender := func(filename string) string {
	now := time.Now().Format(time.RFC3339)
	name := filepath.Base(filename)
	base := strings.TrimSuffix(name, path.Ext(name))
	url := "/commands/" + strings.ToLower(base) + "/"
	return fmt.Sprintf(fmTemplate, now, strings.Replace(base, "_", " ", -1), base, url)
}
```

The `linkHandler` can be used to customize the rendered internal links to the commands, given a filename:

```go
linkHandler := func(name string) string {
	base := strings.TrimSuffix(name, path.Ext(name))
	return "/commands/" + strings.ToLower(base) + "/"
}
```