Generate suggestions from cobra.Command recursively.

[c-bata]

Generate suggestions from cobra.Command defined at kubectl:

https://github.com/kubernetes/kubernetes/blob/d7cadf5d180277cfed7fd57d1e1a125c538bd751/pkg/kubectl/cmd/cmd.go#L221

[c-bata]

package kube

import (
	"github.com/c-bata/go-prompt"
	"github.com/spf13/cobra"
	"k8s.io/kubernetes/pkg/kubectl/cmd"
)

var (
	cobraCommand *cobra.Command
)

func init() {
	cobraCommand = cmd.NewDefaultKubectlCommand()
}

func getSubCommand(command *cobra.Command, name string) *cobra.Command {
	sub := command.Commands()
	for i := range sub {
		if sub[i].Name() == name {
			return sub[i]
		}
	}
	return nil
}

func generateSuggestions(command *cobra.Command) []prompt.Suggest {
	sub := command.Commands()
	suggests := make([]prompt.Suggest, len(sub))
	for i := range sub {
		suggests[i] = prompt.Suggest{Text: sub[i].Name(), Description: sub[i].Long}
	}
}

func argumentsCompleter(args []string) []prompt.Suggest {
	current := cobraCommand
	l := len(args)
	for i := 1; i <= l; i++ {
		if i == l {
			commands := generateSuggestions(current)
			return prompt.FilterHasPrefix(commands, args[0], true)
		}
		current = getSubCommand(current, args[i])
		if current == nil {
			break
		}
	}
	return []prompt.Suggest{}
}

todo: automatically generate flag suggesitons