cmd_sanity.go

/*
Copyright 2016 The Kubernetes 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 sanity

import (
	"fmt"
	"os"
	"strings"

	"github.com/spf13/cobra"
	"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
)

type CmdCheck func(cmd *cobra.Command) []error

var (
	AllCmdChecks = []CmdCheck{
		CheckLongDesc,
		CheckExamples,
	}
)

func CheckCmdTree(cmd *cobra.Command, checks []CmdCheck, skip []string) []error {
	cmdPath := cmd.CommandPath()

	for _, skipCmdPath := range skip {
		if cmdPath == skipCmdPath {
			fmt.Fprintf(os.Stdout, "-----+ skipping command %s\n", cmdPath)
			return []error{}
		}
	}

	errors := []error{}

	if cmd.HasSubCommands() {
		for _, subCmd := range cmd.Commands() {
			errors = append(errors, CheckCmdTree(subCmd, checks, skip)...)
		}
	}

	fmt.Fprintf(os.Stdout, "-----+ checking command %s\n", cmdPath)

	for _, check := range checks {
		if err := check(cmd); err != nil && len(err) > 0 {
			errors = append(errors, err...)
		}
	}

	return errors
}

func CheckLongDesc(cmd *cobra.Command) []error {
	cmdPath := cmd.CommandPath()
	long := cmd.Long
	if len(long) > 0 {
		if strings.Trim(long, " \t\n") != long {
			return []error{fmt.Errorf(`command %q: long description is not normalized
 ↳ make sure you are calling templates.LongDesc (from pkg/cmd/templates) before assigning cmd.Long`, cmdPath)}
		}
	}
	return nil
}

func CheckExamples(cmd *cobra.Command) []error {
	cmdPath := cmd.CommandPath()
	examples := cmd.Example
	errors := []error{}
	if len(examples) > 0 {
		for _, line := range strings.Split(examples, "\n") {
			if !strings.HasPrefix(line, templates.Indentation) {
				errors = append(errors, fmt.Errorf(`command %q: examples are not normalized
 ↳ make sure you are calling templates.Examples (from pkg/cmd/templates) before assigning cmd.Example`, cmdPath))
			}
			if trimmed := strings.TrimSpace(line); strings.HasPrefix(trimmed, "//") {
				errors = append(errors, fmt.Errorf(`command %q: we use # to start comments in examples instead of //`, cmdPath))
			}
		}
	}
	return errors
}