105 lines
2.6 KiB
Markdown
105 lines
2.6 KiB
Markdown
|
# Generating Markdown Docs For Your Own cobra.Command
|
||
|
|
|
||
|
|
Generating man pages from a cobra command is incredibly easy. An example is as follows:
|
||
|
|
|
||
|
|
```go
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"github.com/spf13/cobra"
|
||
|
|
"github.com/spf13/cobra/doc"
|
||
|
|
)
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
cmd := &cobra.Command{
|
||
|
|
Use: "test",
|
||
|
|
Short: "my test program",
|
||
|
|
}
|
||
|
|
doc.GenMarkdownTree(cmd, "/tmp")
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
That will get you a Markdown document `/tmp/test.md`
|
||
|
|
|
||
|
|
## 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"
|
||
|
|
|
||
|
|
kubectlcmd "k8s.io/kubernetes/pkg/kubectl/cmd"
|
||
|
|
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
|
||
|
|
|
||
|
|
"github.com/spf13/cobra/doc"
|
||
|
|
)
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
cmd := kubectlcmd.NewKubectlCommand(cmdutil.NewFactory(nil), os.Stdin, ioutil.Discard, ioutil.Discard)
|
||
|
|
doc.GenMarkdownTree(cmd, "./")
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
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)
|
||
|
|
doc.GenMarkdown(cmd, out)
|
||
|
|
```
|
||
|
|
|
||
|
|
This will write the markdown doc for ONLY "cmd" into the out, buffer.
|
||
|
|
|
||
|
|
## Customize the output
|
||
|
|
|
||
|
|
Both `GenMarkdown` and `GenMarkdownTree` have alternate versions with callbacks to get some control of the output:
|
||
|
|
|
||
|
|
```go
|
||
|
|
func GenMarkdownTreeCustom(cmd *Command, dir string, filePrepender, linkHandler func(string) string) error {
|
||
|
|
//...
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
```go
|
||
|
|
func GenMarkdownCustom(cmd *Command, out *bytes.Buffer, linkHandler func(string) string) error {
|
||
|
|
//...
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
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) + "/"
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|