Add sub command for completion and documentation generation

Signed-off-by: Alexander Sowitzki <alexander@loodse.com>

Gopkg.toml

@@ -73,4 +73,7 @@ required = [
   name = "k8s.io/code-generator"
   non-go = false
   go-tests = false
-  unused-packages = false
+  unused-packages = false
+[[constraint]]
+  name = "github.com/cpuguy83/go-md2man"
+  revision = "691ee98543af2f262f35fbb54bdd42f00b9b9cc5"

pkg/cmd/packaging.go

@@ -0,0 +1,79 @@
+/*
+Copyright 2019 The KubeOne Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package cmd
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/cobra/doc"
+)
+
+func completionCmd(rootCmd *cobra.Command) *cobra.Command {
+	var cmd = &cobra.Command{
+		Use:   "completion <bash|zsh>",
+		Short: "Generates completion scripts for bash and zsh",
+		Long: `To load completion run into your current shell run
+
+. <(kubeone bashCompletion <shell>)
+`,
+		Example:   "kubeone completion bash",
+		ValidArgs: []string{"bash", "zsh"},
+		Args:      cobra.ExactValidArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) (err error) {
+			switch args[0] {
+			case "bash":
+				err = rootCmd.GenBashCompletion(os.Stdout)
+			case "zsh":
+				err = rootCmd.GenZshCompletion(os.Stdout)
+			}
+			return
+		},
+	}
+	return cmd
+}
+
+func docCmd(rootCmd *cobra.Command) *cobra.Command {
+	var path string
+	var cmd = &cobra.Command{
+		Use:       "doc <man|md|rest|yaml>",
+		Short:     "Generates documentation",
+		Long:      "Generation can be generated as Man Pages, Markdown, ReStructured Text Docs or Yaml",
+		Example:   "kubeone completion bash",
+		ValidArgs: []string{"man", "md", "rest", "yaml"},
+		Args:      cobra.ExactValidArgs(1),
+		RunE: func(cmd *cobra.Command, args []string) (err error) {
+			switch args[0] {
+			case "man":
+				header := &doc.GenManHeader{
+					Title:   "KubeOne",
+					Section: "1",
+				}
+				err = doc.GenManTree(rootCmd, header, path)
+			case "md":
+				err = doc.GenMarkdownTree(rootCmd, path)
+			case "rest":
+				err = doc.GenReSTTree(rootCmd, path)
+			case "yaml":
+				err = doc.GenYamlTree(rootCmd, path)
+			}
+			return
+		},
+	}
+	cmd.Flags().StringVarP(&path, "output-dir", "o", "/tmp/", "Directory to populate with documentation")
+	return cmd
+}

pkg/cmd/root.go

@@ -83,6 +83,8 @@ func newRoot() *cobra.Command {
 		kubeconfigCmd(fs),
 		configCmd(fs),
 		versionCmd(fs),
+		completionCmd(rootCmd),
+		docCmd(rootCmd),
 	)
 
 	return rootCmd