text:
// Copyright © 2013 Steve Francia <spf@spf13.com>.
//
// 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 cobra is a commander providing a simple interface to create powerful modern CLI interfaces.
// In addition to providing an interface, Cobra simultaneously provides a controller to organize your application code.
package cobra

import (
	"bytes"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"sort"
	"strings"

	flag "github.com/spf13/pflag"
)

// Command is just that, a command for your application.
// E.g.  'go run ...' - 'run' is the command. Cobra requires
// you to define the usage and description as part of your command
// definition to ensure usability.
type Command struct {
	// Use is the one-line usage message.
	Use string

	// Aliases is an array of aliases that can be used instead of the first word in Use.
	Aliases []string

	// SuggestFor is an array of command names for which this command will be suggested -
	// similar to aliases but only suggests.
	SuggestFor []string

	// Short is the short description shown in the 'help' output.
	Short string

	// Long is the long message shown in the 'help <this-command>' output.
	Long string

	// Example is examples of how to use the command.
	Example string

	// ValidArgs is list of all valid non-flag arguments that are accepted in bash completions
	ValidArgs []string

	// Expected arguments
	Args PositionalArgs

	// ArgAliases is List of aliases for ValidArgs.
	// These are not suggested to the user in the bash completion,
	// but accepted if entered manually.
	ArgAliases []string

	// BashCompletionFunction is custom functions used by the bash autocompletion generator.
	BashCompletionFunction string

	// Deprecated defines, if this command is deprecated and should print this string when used.
	Deprecated string

	// Hidden defines, if this command is hidden and should NOT show up in the list of available commands.
	Hidden bool

	// Annotations are key/value pairs that can be used by applications to identify or
	// group commands.
	Annotations map[string]string

	// Version defines the version for this command. If this value is non-empty and the command does not
	// define a "version" flag, a "version" boolean flag will be added to the command and, if specified,
	// will print content of the "Version" variable.
	Version string

	// The *Run functions are executed in the following order:
	//   * PersistentPreRun()
	//   * PreRun()
	//   * Run()
	//   * PostRun()
	//   * PersistentPostRun()
	// All functions get the same args, the arguments after the command name.
	//
	// PersistentPreRun: children of this command will inherit and execute.
	PersistentPreRun func(cmd *Command, args []string)
	// PersistentPreRunE: PersistentPreRun but returns an error.
	PersistentPreRunE func(cmd *Command, args []string) error
	// PreRun: children of this command will not inherit.
	PreRun func(cmd *Command, args []string)
	// PreRunE: PreRun but returns an error.
	PreRunE func(cmd *Command, args []string) error
	// Run: Typically the actual work function. Most commands will only implement this.
	Run func(cmd *Command, args []string)
	// RunE: Run but returns an error.
	RunE func(cmd *Command, args []string) error
	// PostRun: run after the Run command.
	PostRun func(cmd *Command, args []string)
	// PostRunE: PostRun but returns an error.
	PostRunE func(cmd *Command, args []string) error
	// PersistentPostRun: children of this command will inherit and execute after PostRun.
	PersistentPostRun func(cmd *Command, args []string)
	// PersistentPostRunE: PersistentPostRun but returns an error.
	PersistentPostRunE func(cmd *Command, args []string) error

	// SilenceErrors is an option to quiet errors down stream.
	SilenceErrors bool

	// SilenceUsage is an option to silence usage when an error occurs.
	SilenceUsage bool

	// DisableFlagParsing disables the flag parsing.
	// If this is true all flags will be passed to the command as arguments.
	DisableFlagParsing bool

	// DisableAutoGenTag defines, if gen tag ("Auto generated by spf13/cobra...")
	// will be printed by generating docs for this command.
	DisableAutoGenTag bool

	// DisableFlagsInUseLine will disable the addition of [flags] to the usage
	// line of a command when printing help or generating docs
	DisableFlagsInUseLine bool

	// DisableSuggestions disables the suggestions based on Levenshtein distance
	// that go along with 'unknown command' messages.
	DisableSuggestions bool
	// SuggestionsMinimumDistance defines minimum levenshtein distance to display suggestions.
	// Must be > 0.
	SuggestionsMinimumDistance int

	// TraverseChildren parses flags on all parents before executing child command.
	TraverseChildren bool

	// commands is the list of commands supported by this program.
	commands []*Command
	// parent is a parent command for this command.
	parent *Command
	// Max lengths of commands' string lengths for use in padding.
	commandsMaxUseLen         int
	commandsMaxCommandPathLen int
	commandsMaxNameLen        int
	// commandsAreSorted defines, if command slice are sorted or not.
	commandsAreSorted bool
	// commandCalledAs is the name or alias value used to call this command.
	commandCalledAs struct {
		name   string
		called bool
	}

	// args is actual args parsed from flags.
	args []string
	// flagErrorBuf contains all error messages from pflag.
	flagErrorBuf *bytes.Buffer
	// flags is full set of flags.
	flags *flag.FlagSet
	// pflags contains persistent flags.
	pflags *flag.FlagSet
	// lflags contains local flags.
	lflags *flag.FlagSet
	// iflags contains inherited flags.
	iflags *flag.FlagSet
	// parentsPflags is all persistent flags of cmd's parents.
	parentsPflags *flag.FlagSet
	// globNormFunc is the global normalization function
	// that we can use on every pflag set and children commands
	globNormFunc func(f *flag.FlagSet, name string) flag.NormalizedName

	// output is an output writer defined by user.
	output io.Writer
	// usageFunc is usage func defined by user.
	usageFunc func(*Command) error
	// usageTemplate is usage template defined by user.
	usageTemplate string
	// flagErrorFunc is func defined by user and it's called when the parsing of
	// flags returns an error.
	flagErrorFunc func(*Command, error) error
	// helpTemplate is help template defined by user.
	helpTemplate string
	// helpFunc is help func defined by user.
	helpFunc func(*Command, []string)
	// helpCommand is command with usage 'help'. If it's not defined by user,
	// cobra uses default help command.
	helpCommand *Command
	// versionTemplate is the version template defined by user.
	versionTemplate string
}

// SetArgs sets arguments for the command. It is set to os.Args[1:] by default, if desired, can be overridden
// particularly useful when testing.
func (c *Command) SetArgs(a []string) {
	c.args = a
}

// SetOutput sets the destination for usage and error messages.
// If output is nil, os.Stderr is used.
func (c *Command) SetOutput(output io.Writer) {
	c.output = output
}

// SetUsageFunc sets usage function. Usage can be defined by application.
func (c *Command) SetUsageFunc(f func(*Command) error) {
	c.usageFunc = f
}

// SetUsageTemplate sets usage template. Can be defined by Application.
func (c *Command) SetUsageTemplate(s string) {
	c.usageTemplate = s
}

// SetFlagErrorFunc sets a function to generate an error when flag parsing
// fails.
func (c *Command) SetFlagErrorFunc(f func(*Command, error) error) {
	c.flagErrorFunc = f
}

// SetHelpFunc sets help function. Can be defined by Application.
func (c *Command) SetHelpFunc(f func(*Command, []string)) {
	c.helpFunc = f
}

// SetHelpCommand sets help command.
func (c *Command) SetHelpCommand(cmd *Command) {
	c.helpCommand = cmd
}

// SetHelpTemplate sets help template to be used. Application can use it to set custom template.
func (c *Command) SetHelpTemplate(s string) {
	c.helpTemplate = s
}

// SetVersionTemplate sets version template to be used. Application can use it to set custom template.
func (c *Command) SetVersionTemplate(s string) {
	c.versionTemplate = s
}

// SetGlobalNormalizationFunc sets a normalization function to all flag sets and also to child commands.
// The user should not have a cyclic dependency on commands.
func (c *Command) SetGlobalNormalizationFunc(n func(f *flag.FlagSet, name string) flag.NormalizedName) {
	c.Flags().SetNormalizeFunc(n)
	c.PersistentFlags().SetNormalizeFunc(n)
	c.globNormFunc = n

	for _, command := range c.commands {
		command.SetGlobalNormalizationFunc(n)
	}
}

// OutOrStdout returns output to stdout.
func (c *Command) OutOrStdout() io.Writer {
	return c.getOut(os.Stdout)
}

// OutOrStderr returns output to stderr
func (c *Command) OutOrStderr() io.Writer {
	return c.getOut(os.Stderr)
}

func (c *Command) getOut(def io.Writer) io.Writer {
	if c.output != nil {
		return c.output
	}
	if c.HasParent() {
		return c.parent.getOut(def)
	}
	return def
}

// UsageFunc returns either the function set by SetUsageFunc for this command
// or a parent, or it returns a default usage function.
func (c *Command) UsageFunc() (f func(*Command) error) {
	if c.usageFunc != nil {
		return c.usageFunc
	}
	if c.HasParent() {
		return c.Parent().UsageFunc()
	}
	return func(c *Command) error {
		c.mergePersistentFlags()
		err := tmpl(c.OutOrStderr(), c.UsageTemplate(), c)
		if err != nil {
			c.Println(err)
		}
		return err
	}
}

// Usage puts out the usage for the command.
// Used when a user provides invalid input.
// Can be defined by user by overriding UsageFunc.
func (c *Command) Usage() error {
	return c.UsageFunc()(c)
}

// HelpFunc returns either the function set by SetHelpFunc for this command
// or a parent, or it returns a function with default help behavior.
func (c *Command) HelpFunc() func(*Command, []string) {
	if c.helpFunc != nil {
		return c.helpFunc
	}
	if c.HasParent() {
		return c.Parent().HelpFunc()
	}
	return func(c *Command, a []string) {
		c.mergePersistentFlags()
		err := tmpl(c.OutOrStdout(), c.HelpTemplate(), c)
		if err != nil {
			c.Println(err)
		}
	}
}

// Help puts out the help for the command.
// Used when a user calls help [command].
// Can be defined by user by overriding HelpFunc.
func (c *Command) Help() error {
	c.HelpFunc()(c, []string{})
	return nil
}

// UsageString return usage string.
func (c *Command) UsageString() string {
	tmpOutput := c.output
	bb := new(bytes.Buffer)
	c.SetOutput(bb)
	c.Usage()
	c.output = tmpOutput
	return bb.String()
}

// FlagErrorFunc returns either the function set by SetFlagErrorFunc for this
// command or a parent, or it returns a function which returns the original
// error.
func (c *Command) FlagErrorFunc() (f func(*Command, error) error) {
	if c.flagErrorFunc != nil {
		return c.flagErrorFunc
	}

	if c.HasParent() {
		return c.parent.FlagErrorFunc()
	}
	return func(c *Command, err error) error {
		return err
	}
}

var minUsagePadding = 25

// UsagePadding return padding for the usage.
func (c *Command) UsagePadding() int {
	if c.parent == nil || minUsagePadding > c.parent.commandsMaxUseLen {
		return minUsagePadding
	}
	return c.parent.commandsMaxUseLen
}

var minCommandPathPadding = 11

// CommandPathPadding return padding for the command path.
func (c *Command) CommandPathPadding() int {
	if c.parent == nil || minCommandPathPadding > c.parent.commandsMaxCommandPathLen {
		return minCommandPathPadding
	}
	return c.parent.commandsMaxCommandPathLen
}

var minNamePadding = 11

// NamePadding returns padding for the name.
func (c *Command) NamePadding() int {
	if c.parent == nil || minNamePadding > c.parent.commandsMaxNameLen {
		return minNamePadding
	}
	return c.parent.commandsMaxNameLen
}

// UsageTemplate returns usage template for the command.
func (c *Command) UsageTemplate() string {
	if c.usageTemplate != "" {
		return c.usageTemplate
	}

	if c.HasParent() {
		return c.parent.UsageTemplate()
	}
	return `Usage:{{if .Runnable}}
  {{.UseLine}}{{end}}{{if .HasAvailableSubCommands}}
  {{.CommandPath}} [command]{{end}}{{if gt (len .Aliases) 0}}

Aliases:
  {{.NameAndAliases}}{{end}}{{if .HasExample}}

Examples:
{{.Example}}{{end}}{{if .HasAvailableSubCommands}}

Available Commands:{{range .Commands}}{{if (or .IsAvailableCommand (eq .Name "help"))}}
  {{rpad .Name .NamePadding }} {{.Short}}{{end}}{{end}}{{end}}{{if .HasAvailableLocalFlags}}

Flags:
{{.LocalFlags.FlagUsages | trimTrailingWhitespaces}}{{end}}{{if .HasAvailableInheritedFlags}}

Global Flags:
{{.InheritedFlags.FlagUsages | trimTrailingWhitespaces}}{{end}}{{if .HasHelpSubCommands}}

Additional help topics:{{range .Commands}}{{if .IsAdditionalHelpTopicCommand}}
  {{rpad .CommandPath .CommandPathPadding}} {{.Short}}{{end}}{{end}}{{end}}{{if .HasAvailableSubCommands}}

Use "{{.CommandPath}} [command] --help" for more information about a command.{{end}}
`
}

// HelpTemplate return help template for the command.
func (c *Command) HelpTemplate() string {
	if c.helpTemplate != "" {
		return c.helpTemplate
	}

	if c.HasParent() {
		return c.parent.HelpTemplate()
	}
	return `{{with (or .Long .Short)}}{{. | trimTrailingWhitespaces}}

{{end}}{{if or .Runnable .HasSubCommands}}{{.UsageString}}{{end}}`
}

// VersionTemplate return version template for the command.
func (c *Command) VersionTemplate() string {
	if c.versionTemplate != "" {
		return c.versionTemplate
	}

	if c.HasParent() {
		return c.parent.VersionTemplate()
	}
	return `{{with .Name}}{{printf "%s " .}}{{end}}{{printf "version %s" .Version}}
`
}

func hasNoOptDefVal(name string, fs *flag.FlagSet) bool {
	flag := fs.Lookup(name)
	if flag == nil {
		return false
	}
	return flag.NoOptDefVal != ""
}

func shortHasNoOptDefVal(name string, fs *flag.FlagSet) bool {
	if len(name) == 0 {
		return false
	}

	flag := fs.ShorthandLookup(name[:1])
	if flag == nil {
		return false
	}
	return flag.NoOptDefVal != ""
}

func stripFlags(args []string, c *Command) []string {
	if len(args) == 0 {
		return args
	}
	c.mergePersistentFlags()

	commands := []string{}
	flags := c.Flags()

Loop:
	for len(args) > 0 {
		s := args[0]
		args = args[1:]
		switch {
		case s == "--":
			// "--" terminates the flags
			break Loop
		case strings.HasPrefix(s, "--") && !strings.Contains(s, "=") && !hasNoOptDefVal(s[2:], flags):
			// If '--flag arg' then
			// delete arg from args.
			fallthrough // (do the same as below)
		case strings.HasPrefix(s, "-") && !strings.Contains(s, "=") && len(s) == 2 && !shortHasNoOptDefVal(s[1:], flags):
			// If '-f arg' then
			// delete 'arg' from args or break the loop if len(args) <= 1.
			if len(args) <= 1 {
				break Loop
			} else {
				args = args[1:]
				continue
			}
		case s != "" && !strings.HasPrefix(s, "-"):
			commands = append(commands, s)
		}
	}

	return commands
}

// argsMinusFirstX removes only the first x from args.  Otherwise, commands that look like
// openshift admin policy add-role-to-user admin my-user, lose the admin argument (arg[4]).
func argsMinusFirstX(args []string, x string) []string {
	for i, y := range args {
		if x == y {
			ret := []string{}
			ret = append(ret, args[:i]...)
			ret = append(ret, args[i+1:]...)
			return ret
		}
	}
	return args
}

func isFlagArg(arg string) bool {
	return ((len(arg) >= 3 && arg[1] == '-') ||
		(len(arg) >= 2 && arg[0] == '-' && arg[1] != '-'))
}

// Find the target command given the args and command tree
// Meant to be run on the highest node. Only searches down.
func (c *Command) Find(args []string) (*Command, []string, error) {
	var innerfind func(*Command, []string) (*Command, []string)

	innerfind = func(c *Command, innerArgs []string) (*Command, []string) {
		argsWOflags := stripFlags(innerArgs, c)
		if len(argsWOflags) == 0 {
			return c, innerArgs
		}
		nextSubCmd := argsWOflags[0]

		cmd := c.findNext(nextSubCmd)
		if cmd != nil {
			return innerfind(cmd, argsMinusFirstX(innerArgs, nextSubCmd))
		}
		return c, innerArgs
	}

	commandFound, a := innerfind(c, args)
	if commandFound.Args == nil {
		return commandFound, a, legacyArgs(commandFound, stripFlags(a, commandFound))
	}
	return commandFound, a, nil
}

func (c *Command) findSuggestions(arg string) string {
	if c.DisableSuggestions {
		return ""
	}
	if c.SuggestionsMinimumDistance <= 0 {
		c.SuggestionsMinimumDistance = 2
	}
	suggestionsString := ""
	if suggestions := c.SuggestionsFor(arg); len(suggestions) > 0 {
		suggestionsString += "\n\nDid you mean this?\n"
		for _, s := range suggestions {
			suggestionsString += fmt.Sprintf("\t%v\n", s)
		}
	}
	return suggestionsString
}

func (c *Command) findNext(next string) *Command {
	matches := make([]*Command, 0)
	for _, cmd := range c.commands {
		if cmd.Name() == next || cmd.HasAlias(next) {
			cmd.commandCalledAs.name = next
			return cmd
		}
		if EnablePrefixMatching && cmd.hasNameOrAliasPrefix(next) {
			matches = append(matches, cmd)
		}
	}

	if len(matches) == 1 {
		return matches[0]
	}

	return nil
}

// Traverse the command tree to find the command, and parse args for
// each parent.
func (c *Command) Traverse(args []string) (*Command, []string, error) {
	flags := []string{}
	inFlag := false

	for i, arg := range args {
		switch {
		// A long flag with a space separated value
		case strings.HasPrefix(arg, "--") && !strings.Contains(arg, "="):
			// TODO: this isn't quite right, we should really check ahead for 'true' or 'false'
			inFlag = !hasNoOptDefVal(arg[2:], c.Flags())
			flags = append(flags, arg)
			continue
		// A short flag with a space separated value
		case strings.HasPrefix(arg, "-") && !strings.Contains(arg, "=") && len(arg) == 2 && !shortHasNoOptDefVal(arg[1:], c.Flags()):
			inFlag = true
			flags = append(flags, arg)
			continue
		// The value for a flag
		case inFlag:
			inFlag = false
			flags = append(flags, arg)
			continue
		// A flag without a value, or with an `=` separated value
		case isFlagArg(arg):
			flags = append(flags, arg)
			continue
		}

		cmd := c.findNext(arg)
		if cmd == nil {
			return c, args, nil
		}

		if err := c.ParseFlags(flags); err != nil {
			return nil, args, err
		}
		return cmd.Traverse(args[i+1:])
	}
	return c, args, nil
}

// SuggestionsFor provides suggestions for the typedName.
func (c *Command) SuggestionsFor(typedName string) []string {
	suggestions := []string{}
	for _, cmd := range c.commands {
		if cmd.IsAvailableCommand() {
			levenshteinDistance := ld(typedName, cmd.Name(), true)
			suggestByLevenshtein := levenshteinDistance <= c.SuggestionsMinimumDistance
			suggestByPrefix := strings.HasPrefix(strings.ToLower(cmd.Name()), strings.ToLower(typedName))
			if suggestByLevenshtein || suggestByPrefix {
				suggestions = append(suggestions, cmd.Name())
			}
			for _, explicitSuggestion := range cmd.SuggestFor {
				if strings.EqualFold(typedName, explicitSuggestion) {
					suggestions = append(suggestions, cmd.Name())
				}
			}
		}
	}
	return suggestions
}

// VisitParents visits all parents of the command and invokes fn on each parent.
func (c *Command) VisitParents(fn func(*Command)) {
	if c.HasParent() {
		fn(c.Parent())
		c.Parent().VisitParents(fn)
	}
}

// Root finds root command.
func (c *Command) Root() *Command {
	if c.HasParent() {
		return c.Parent().Root()
	}
	return c
}

// ArgsLenAtDash will return the length of c.Flags().Args at the moment
// when a -- was found during args parsing.
func (c *Command) ArgsLenAtDash() int {
	return c.Flags().ArgsLenAtDash()
}

func (c *Command) execute(a []string) (err error) {
	if c == nil {
		return fmt.Errorf("Called Execute() on a nil Command")
	}

	if len(c.Deprecated) > 0 {
		c.Printf("Command %q is deprecated, %s\n", c.Name(), c.Deprecated)
	}

	// initialize help and version flag at the last point possible to allow for user
	// overriding
	c.InitDefaultHelpFlag()
	c.InitDefaultVersionFlag()

	err = c.ParseFlags(a)
	if err != nil {
		return c.FlagErrorFunc()(c, err)
	}

	// If help is called, regardless of other flags, return we want help.
	// Also say we need help if the command isn't runnable.
	helpVal, err := c.Flags().GetBool("help")
	if err != nil {
		// should be impossible to get here as we always declare a help
		// flag in InitDefaultHelpFlag()
		c.Println("\"help\" flag declared as non-bool. Please correct your code")
		return err
	}

	if helpVal {
		return flag.ErrHelp
	}

	// for back-compat, only add version flag behavior if version is defined
	if c.Version != "" {
		versionVal, err := c.Flags().GetBool("version")
		if err != nil {
			c.Println("\"version\" flag declared as non-bool. Please correct your code")
			return err
		}
		if versionVal {
			err := tmpl(c.OutOrStdout(), c.VersionTemplate(), c)
			if err != nil {
				c.Println(err)
			}
			return err
		}
	}

	if !c.Runnable() {
		return flag.ErrHelp
	}

	c.preRun()

	argWoFlags := c.Flags().Args()
	if c.DisableFlagParsing {
		argWoFlags = a
	}

	if err := c.ValidateArgs(argWoFlags); err != nil {
		return err
	}

	for p := c; p != nil; p = p.Parent() {
		if p.PersistentPreRunE != nil {
			if err := p.PersistentPreRunE(c, argWoFlags); err != nil {
				return err
			}
			break
		} else if p.PersistentPreRun != nil {
			p.PersistentPreRun(c, argWoFlags)
			break
		}
	}
	if c.PreRunE != nil {
		if err := c.PreRunE(c, argWoFlags); err != nil {
			return err
		}
	} else if c.PreRun != nil {
		c.PreRun(c, argWoFlags)
	}

	if err := c.validateRequiredFlags(); err != nil {
		return err
	}
	if c.RunE != nil {
		if err := c.RunE(c, argWoFlags); err != nil {
			return err
		}
	} else {
		c.Run(c, argWoFlags)
	}
	if c.PostRunE != nil {
		if err := c.PostRunE(c, argWoFlags); err != nil {
			return err
		}
	} else if c.PostRun != nil {
		c.PostRun(c, argWoFlags)
	}
	for p := c; p != nil; p = p.Parent() {
		if p.PersistentPostRunE != nil {
			if err := p.PersistentPostRunE(c, argWoFlags); err != nil {
				return err
			}
			break
		} else if p.PersistentPostRun != nil {
			p.PersistentPostRun(c, argWoFlags)
			break
		}
	}

	return nil
}

func (c *Command) preRun() {
	for _, x := range initializers {
		x()
	}
}

// Execute uses the args (os.Args[1:] by default)
// and run through the command tree finding appropriate matches
// for commands and then corresponding flags.
func (c *Command) Execute() error {
	_, err := c.ExecuteC()
	return err
}

// ExecuteC executes the command.
func (c *Command) ExecuteC() (cmd *Command, err error) {
	// Regardless of what command execute is called on, run on Root only
	if c.HasParent() {
		return c.Root().ExecuteC()
	}

	// windows hook
	if preExecHookFn != nil {
		preExecHookFn(c)
	}

	// initialize help as the last point possible to allow for user
	// overriding
	c.InitDefaultHelpCmd()

	var args []string

	// Workaround FAIL with "go test -v" or "cobra.test -test.v", see #155
	if c.args == nil && filepath.Base(os.Args[0]) != "cobra.test" {
		args = os.Args[1:]
	} else {
		args = c.args
	}

	var flags []string
	if c.TraverseChildren {
		cmd, flags, err = c.Traverse(args)
	} else {
		cmd, flags, err = c.Find(args)
	}
	if err != nil {
		// If found parse to a subcommand and then failed, talk about the subcommand
		if cmd != nil {
			c = cmd
		}
		if !c.SilenceErrors {
			c.Println("Error:", err.Error())
			c.Printf("Run '%v --help' for usage.\n", c.CommandPath())
		}
		return c, err
	}

	cmd.commandCalledAs.called = true
	if cmd.commandCalledAs.name == "" {
		cmd.commandCalledAs.name = cmd.Name()
	}

	err = cmd.execute(flags)
	if err != nil {
		// Always show help if requested, even if SilenceErrors is in
		// effect
		if err == flag.ErrHelp {
			cmd.HelpFunc()(cmd, args)
			return cmd, nil
		}

		// If root command has SilentErrors flagged,
		// all subcommands should respect it
		if !cmd.SilenceErrors && !c.SilenceErrors {
			c.Println("Error:", err.Error())
		}

		// If root command has SilentUsage flagged,
		// all subcommands should respect it
		if !cmd.SilenceUsage && !c.SilenceUsage {
			c.Println(cmd.UsageString())
		}
	}
	return cmd, err
}

func (c *Command) ValidateArgs(args []string) error {
	if c.Args == nil {
		return nil
	}
	return c.Args(c, args)
}

func (c *Command) validateRequiredFlags() error {
	flags := c.Flags()
	missingFlagNames := []string{}
	flags.VisitAll(func(pflag *flag.Flag) {
		requiredAnnotation, found := pflag.Annotations[BashCompOneRequiredFlag]
		if !found {
			return
		}
		if (requiredAnnotation[0] == "true") && !pflag.Changed {
			missingFlagNames = append(missingFlagNames, pflag.Name)
		}
	})

	if len(missingFlagNames) > 0 {
		return fmt.Errorf(`required flag(s) "%s" not set`, strings.Join(missingFlagNames, `", "`))
	}
	return nil
}

// InitDefaultHelpFlag adds default help flag to c.
// It is called automatically by executing the c or by calling help and usage.
// If c already has help flag, it will do nothing.
func (c *Command) InitDefaultHelpFlag() {
	c.mergePersistentFlags()
	if c.Flags().Lookup("help") == nil {
		usage := "help for "
		if c.Name() == "" {
			usage += "this command"
		} else {
			usage += c.Name()
		}
		c.Flags().BoolP("help", "h", false, usage)
	}
}

// InitDefaultVersionFlag adds default version flag to c.
// It is called automatically by executing the c.
// If c already has a version flag, it will do nothing.
// If c.Version is empty, it will do nothing.
func (c *Command) InitDefaultVersionFlag() {
	if c.Version == "" {
		return
	}

	c.mergePersistentFlags()
	if c.Flags().Lookup("version") == nil {
		usage := "version for "
		if c.Name() == "" {
			usage += "this command"
		} else {
			usage += c.Name()
		}
		c.Flags().Bool("version", false, usage)
	}
}

// InitDefaultHelpCmd adds default help command to c.
// It is called automatically by executing the c or by calling help and usage.
// If c already has help command or c has no subcommands, it will do nothing.
func (c *Command) InitDefaultHelpCmd() {
	if !c.HasSubCommands() {
		return
	}

	if c.helpCommand == nil {
		c.helpCommand = &Command{
			Use:   "help [command]",
			Short: "Help about any command",
			Long: `Help provides help for any command in the application.
Simply type ` + c.Name() + ` help [path to command] for full details.`,

			Run: func(c *Command, args []string) {
				cmd, _, e := c.Root().Find(args)
				if cmd == nil || e != nil {
					c.Printf("Unknown help topic %#q\n", args)
					c.Root().Usage()
				} else {
					cmd.InitDefaultHelpFlag() // make possible 'help' flag to be shown
					cmd.Help()
				}
			},
		}
	}
	c.RemoveCommand(c.helpCommand)
	c.AddCommand(c.helpCommand)
}

// ResetCommands delete parent, subcommand and help command from c.
func (c *Command) ResetCommands() {
	c.parent = nil
	c.commands = nil
	c.helpCommand = nil
	c.parentsPflags = nil
}

// Sorts commands by their names.
type commandSorterByName []*Command

func (c commandSorterByName) Len() int           { return len(c) }
func (c commandSorterByName) Swap(i, j int)      { c[i], c[j] = c[j], c[i] }
func (c commandSorterByName) Less(i, j int) bool { return c[i].Name() < c[j].Name() }

// Commands returns a sorted slice of child commands.
func (c *Command) Commands() []*Command {
	// do not sort commands if it already sorted or sorting was disabled
	if EnableCommandSorting && !c.commandsAreSorted {
		sort.Sort(commandSorterByName(c.commands))
		c.commandsAreSorted = true
	}
	return c.commands
}

// AddCommand adds one or more commands to this parent command.
func (c *Command) AddCommand(cmds ...*Command) {
	for i, x := range cmds {
		if cmds[i] == c {
			panic("Command can't be a child of itself")
		}
		cmds[i].parent = c
		// update max lengths
		usageLen := len(x.Use)
		if usageLen > c.commandsMaxUseLen {
			c.commandsMaxUseLen = usageLen
		}
		commandPathLen := len(x.CommandPath())
		if commandPathLen > c.commandsMaxCommandPathLen {
			c.commandsMaxCommandPathLen = commandPathLen
		}
		nameLen := len(x.Name())
		if nameLen > c.commandsMaxNameLen {
			c.commandsMaxNameLen = nameLen
		}
		// If global normalization function exists, update all children
		if c.globNormFunc != nil {
			x.SetGlobalNormalizationFunc(c.globNormFunc)
		}
		c.commands = append(c.commands, x)
		c.commandsAreSorted = false
	}
}

// RemoveCommand removes one or more commands from a parent command.
func (c *Command) RemoveCommand(cmds ...*Command) {
	commands := []*Command{}
main:
	for _, command := range c.commands {
		for _, cmd := range cmds {
			if command == cmd {
				command.parent = nil
				continue main
			}
		}
		commands = append(commands, command)
	}
	c.commands = commands
	// recompute all lengths
	c.commandsMaxUseLen = 0
	c.commandsMaxCommandPathLen = 0
	c.commandsMaxNameLen = 0
	for _, command := range c.commands {
		usageLen := len(command.Use)
		if usageLen > c.commandsMaxUseLen {
			c.commandsMaxUseLen = usageLen
		}
		commandPathLen := len(command.CommandPath())
		if commandPathLen > c.commandsMaxCommandPathLen {
			c.commandsMaxCommandPathLen = commandPathLen
		}
		nameLen := len(command.Name())
		if nameLen > c.commandsMaxNameLen {
			c.commandsMaxNameLen = nameLen
		}
	}
}

// Print is a convenience method to Print to the defined output, fallback to Stderr if not set.
func (c *Command) Print(i ...interface{}) {
	fmt.Fprint(c.OutOrStderr(), i...)
}

// Println is a convenience method to Println to the defined output, fallback to Stderr if not set.
func (c *Command) Println(i ...interface{}) {
	c.Print(fmt.Sprintln(i...))
}

// Printf is a convenience method to Printf to the defined output, fallback to Stderr if not set.
func (c *Command) Printf(format string, i ...interface{}) {
	c.Print(fmt.Sprintf(format, i...))
}

// CommandPath returns the full path to this command.
func (c *Command) CommandPath() string {
	if c.HasParent() {
		return c.Parent().CommandPath() + " " + c.Name()
	}
	return c.Name()
}

// UseLine puts out the full usage for a given command (including parents).
func (c *Command) UseLine() string {
	var useline string
	if c.HasParent() {
		useline = c.parent.CommandPath() + " " + c.Use
	} else {
		useline = c.Use
	}
	if c.DisableFlagsInUseLine {
		return useline
	}
	if c.HasAvailableFlags() && !strings.Contains(useline, "[flags]") {
		useline += " [flags]"
	}
	return useline
}

// DebugFlags used to determine which flags have been assigned to which commands
// and which persist.
func (c *Command) DebugFlags() {
	c.Println("DebugFlags called on", c.Name())
	var debugflags func(*Command)

	debugflags = func(x *Command) {
		if x.HasFlags() || x.HasPersistentFlags() {
			c.Println(x.Name())
		}
		if x.HasFlags() {
			x.flags.VisitAll(func(f *flag.Flag) {
				if x.HasPersistentFlags() && x.persistentFlag(f.Name) != nil {
					c.Println("  -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, "  [LP]")
				} else {
					c.Println("  -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, "  [L]")
				}
			})
		}
		if x.HasPersistentFlags() {
			x.pflags.VisitAll(func(f *flag.Flag) {
				if x.HasFlags() {
					if x.flags.Lookup(f.Name) == nil {
						c.Println("  -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, "  [P]")
					}
				} else {
					c.Println("  -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, "  [P]")
				}
			})
		}
		c.Println(x.flagErrorBuf)
		if x.HasSubCommands() {
			for _, y := range x.commands {
				debugflags(y)
			}
		}
	}

	debugflags(c)
}

// Name returns the command's name: the first word in the use line.
func (c *Command) Name() string {
	name := c.Use
	i := strings.Index(name, " ")
	if i >= 0 {
		name = name[:i]
	}
	return name
}

// HasAlias determines if a given string is an alias of the command.
func (c *Command) HasAlias(s string) bool {
	for _, a := range c.Aliases {
		if a == s {
			return true
		}
	}
	return false
}

// CalledAs returns the command name or alias that was used to invoke
// this command or an empty string if the command has not been called.
func (c *Command) CalledAs() string {
	if c.commandCalledAs.called {
		return c.commandCalledAs.name
	}
	return ""
}

// hasNameOrAliasPrefix returns true if the Name or any of aliases start
// with prefix
func (c *Command) hasNameOrAliasPrefix(prefix string) bool {
	if strings.HasPrefix(c.Name(), prefix) {
		c.commandCalledAs.name = c.Name()
		return true
	}
	for _, alias := range c.Aliases {
		if strings.HasPrefix(alias, prefix) {
			c.commandCalledAs.name = alias
			return true
		}
	}
	return false
}

// NameAndAliases returns a list of the command name and all aliases
func (c *Command) NameAndAliases() string {
	return strings.Join(append([]string{c.Name()}, c.Aliases...), ", ")
}

// HasExample determines if the command has example.
func (c *Command) HasExample() bool {
	return len(c.Example) > 0
}

// Runnable determines if the command is itself runnable.
func (c *Command) Runnable() bool {
	return c.Run != nil || c.RunE != nil
}

// HasSubCommands determines if the command has children commands.
func (c *Command) HasSubCommands() bool {
	return len(c.commands) > 0
}

// IsAvailableCommand determines if a command is available as a non-help command
// (this includes all non deprecated/hidden commands).
func (c *Command) IsAvailableCommand() bool {
	if len(c.Deprecated) != 0 || c.Hidden {
		return false
	}

	if c.HasParent() && c.Parent().helpCommand == c {
		return false
	}

	if c.Runnable() || c.HasAvailableSubCommands() {
		return true
	}

	return false
}

// IsAdditionalHelpTopicCommand determines if a command is an additional
// help topic command; additional help topic command is determined by the
// fact that it is NOT runnable/hidden/deprecated, and has no sub commands that
// are runnable/hidden/deprecated.
// Concrete example: https://github.com/spf13/cobra/issues/393#issuecomment-282741924.
func (c *Command) IsAdditionalHelpTopicCommand() bool {
	// if a command is runnable, deprecated, or hidden it is not a 'help' command
	if c.Runnable() || len(c.Deprecated) != 0 || c.Hidden {
		return false
	}

	// if any non-help sub commands are found, the command is not a 'help' command
	for _, sub := range c.commands {
		if !sub.IsAdditionalHelpTopicCommand() {
			return false
		}
	}

	// the command either has no sub commands, or no non-help sub commands
	return true
}

// HasHelpSubCommands determines if a command has any available 'help' sub commands
// that need to be shown in the usage/help default template under 'additional help
// topics'.
func (c *Command) HasHelpSubCommands() bool {
	// return true on the first found available 'help' sub command
	for _, sub := range c.commands {
		if sub.IsAdditionalHelpTopicCommand() {
			return true
		}
	}

	// the command either has no sub commands, or no available 'help' sub commands
	return false
}

// HasAvailableSubCommands determines if a command has available sub commands that
// need to be shown in the usage/help default template under 'available commands'.
func (c *Command) HasAvailableSubCommands() bool {
	// return true on the first found available (non deprecated/help/hidden)
	// sub command
	for _, sub := range c.commands {
		if sub.IsAvailableCommand() {
			return true
		}
	}

	// the command either has no sub commands, or no available (non deprecated/help/hidden)
	// sub commands
	return false
}

// HasParent determines if the command is a child command.
func (c *Command) HasParent() bool {
	return c.parent != nil
}

// GlobalNormalizationFunc returns the global normalization function or nil if it doesn't exist.
func (c *Command) GlobalNormalizationFunc() func(f *flag.FlagSet, name string) flag.NormalizedName {
	return c.globNormFunc
}

// Flags returns the complete FlagSet that applies
// to this command (local and persistent declared here and by all parents).
func (c *Command) Flags() *flag.FlagSet {
	if c.flags == nil {
		c.flags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
		if c.flagErrorBuf == nil {
			c.flagErrorBuf = new(bytes.Buffer)
		}
		c.flags.SetOutput(c.flagErrorBuf)
	}

	return c.flags
}

// LocalNonPersistentFlags are flags specific to this command which will NOT persist to subcommands.
func (c *Command) LocalNonPersistentFlags() *flag.FlagSet {
	persistentFlags := c.PersistentFlags()

	out := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
	c.LocalFlags().VisitAll(func(f *flag.Flag) {
		if persistentFlags.Lookup(f.Name) == nil {
			out.AddFlag(f)
		}
	})
	return out
}

// LocalFlags returns the local FlagSet specifically set in the current command.
func (c *Command) LocalFlags() *flag.FlagSet {
	c.mergePersistentFlags()

	if c.lflags == nil {
		c.lflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
		if c.flagErrorBuf == nil {
			c.flagErrorBuf = new(bytes.Buffer)
		}
		c.lflags.SetOutput(c.flagErrorBuf)
	}
	c.lflags.SortFlags = c.Flags().SortFlags
	if c.globNormFunc != nil {
		c.lflags.SetNormalizeFunc(c.globNormFunc)
	}

	addToLocal := func(f *flag.Flag) {
		if c.lflags.Lookup(f.Name) == nil && c.parentsPflags.Lookup(f.Name) == nil {
			c.lflags.AddFlag(f)
		}
	}
	c.Flags().VisitAll(addToLocal)
	c.PersistentFlags().VisitAll(addToLocal)
	return c.lflags
}

// InheritedFlags returns all flags which were inherited from parents commands.
func (c *Command) InheritedFlags() *flag.FlagSet {
	c.mergePersistentFlags()

	if c.iflags == nil {
		c.iflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
		if c.flagErrorBuf == nil {
			c.flagErrorBuf = new(bytes.Buffer)
		}
		c.iflags.SetOutput(c.flagErrorBuf)
	}

	local := c.LocalFlags()
	if c.globNormFunc != nil {
		c.iflags.SetNormalizeFunc(c.globNormFunc)
	}

	c.parentsPflags.VisitAll(func(f *flag.Flag) {
		if c.iflags.Lookup(f.Name) == nil && local.Lookup(f.Name) == nil {
			c.iflags.AddFlag(f)
		}
	})
	return c.iflags
}

// NonInheritedFlags returns all flags which were not inherited from parent commands.
func (c *Command) NonInheritedFlags() *flag.FlagSet {
	return c.LocalFlags()
}

// PersistentFlags returns the persistent FlagSet specifically set in the current command.
func (c *Command) PersistentFlags() *flag.FlagSet {
	if c.pflags == nil {
		c.pflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
		if c.flagErrorBuf == nil {
			c.flagErrorBuf = new(bytes.Buffer)
		}
		c.pflags.SetOutput(c.flagErrorBuf)
	}
	return c.pflags
}

// ResetFlags deletes all flags from command.
func (c *Command) ResetFlags() {
	c.flagErrorBuf = new(bytes.Buffer)
	c.flagErrorBuf.Reset()
	c.flags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
	c.flags.SetOutput(c.flagErrorBuf)
	c.pflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
	c.pflags.SetOutput(c.flagErrorBuf)

	c.lflags = nil
	c.iflags = nil
	c.parentsPflags = nil
}

// HasFlags checks if the command contains any flags (local plus persistent from the entire structure).
func (c *Command) HasFlags() bool {
	return c.Flags().HasFlags()
}

// HasPersistentFlags checks if the command contains persistent flags.
func (c *Command) HasPersistentFlags() bool {
	return c.PersistentFlags().HasFlags()
}

// HasLocalFlags checks if the command has flags specifically declared locally.
func (c *Command) HasLocalFlags() bool {
	return c.LocalFlags().HasFlags()
}

// HasInheritedFlags checks if the command has flags inherited from its parent command.
func (c *Command) HasInheritedFlags() bool {
	return c.InheritedFlags().HasFlags()
}

// HasAvailableFlags checks if the command contains any flags (local plus persistent from the entire
// structure) which are not hidden or deprecated.
func (c *Command) HasAvailableFlags() bool {
	return c.Flags().HasAvailableFlags()
}

// HasAvailablePersistentFlags checks if the command contains persistent flags which are not hidden or deprecated.
func (c *Command) HasAvailablePersistentFlags() bool {
	return c.PersistentFlags().HasAvailableFlags()
}

// HasAvailableLocalFlags checks if the command has flags specifically declared locally which are not hidden
// or deprecated.
func (c *Command) HasAvailableLocalFlags() bool {
	return c.LocalFlags().HasAvailableFlags()
}

// HasAvailableInheritedFlags checks if the command has flags inherited from its parent command which are
// not hidden or deprecated.
func (c *Command) HasAvailableInheritedFlags() bool {
	return c.InheritedFlags().HasAvailableFlags()
}

// Flag climbs up the command tree looking for matching flag.
func (c *Command) Flag(name string) (flag *flag.Flag) {
	flag = c.Flags().Lookup(name)

	if flag == nil {
		flag = c.persistentFlag(name)
	}

	return
}

// Recursively find matching persistent flag.
func (c *Command) persistentFlag(name string) (flag *flag.Flag) {
	if c.HasPersistentFlags() {
		flag = c.PersistentFlags().Lookup(name)
	}

	if flag == nil {
		c.updateParentsPflags()
		flag = c.parentsPflags.Lookup(name)
	}
	return
}

// ParseFlags parses persistent flag tree and local flags.
func (c *Command) ParseFlags(args []string) error {
	if c.DisableFlagParsing {
		return nil
	}

	if c.flagErrorBuf == nil {
		c.flagErrorBuf = new(bytes.Buffer)
	}
	beforeErrorBufLen := c.flagErrorBuf.Len()
	c.mergePersistentFlags()
	err := c.Flags().Parse(args)
	// Print warnings if they occurred (e.g. deprecated flag messages).
	if c.flagErrorBuf.Len()-beforeErrorBufLen > 0 && err == nil {
		c.Print(c.flagErrorBuf.String())
	}

	return err
}

// Parent returns a commands parent command.
func (c *Command) Parent() *Command {
	return c.parent
}

// mergePersistentFlags merges c.PersistentFlags() to c.Flags()
// and adds missing persistent flags of all parents.
func (c *Command) mergePersistentFlags() {
	c.updateParentsPflags()
	c.Flags().AddFlagSet(c.PersistentFlags())
	c.Flags().AddFlagSet(c.parentsPflags)
}

// updateParentsPflags updates c.parentsPflags by adding
// new persistent flags of all parents.
// If c.parentsPflags == nil, it makes new.
func (c *Command) updateParentsPflags() {
	if c.parentsPflags == nil {
		c.parentsPflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
		c.parentsPflags.SetOutput(c.flagErrorBuf)
		c.parentsPflags.SortFlags = false
	}

	if c.globNormFunc != nil {
		c.parentsPflags.SetNormalizeFunc(c.globNormFunc)
	}

	c.Root().PersistentFlags().AddFlagSet(flag.CommandLine)

	c.VisitParents(func(parent *Command) {
		c.parentsPflags.AddFlagSet(parent.PersistentFlags())
	})
}


text:
// Copyright © 2015 Steve Francia <spf@spf13.com>.
//
// 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 main

import "github.com/spf13/cobra/cobra/cmd"

func main() {
	cmd.Execute()
}

repo_name: dan-v/dosxvpn

repo_language: Go

mime_type: text/x-shellscript


text:
# Cobra Generator

Cobra provides its own program that will create your application and add any
commands you want. It's the easiest way to incorporate Cobra into your application.

In order to use the cobra command, compile it using the following command:

    go get github.com/spf13/cobra/cobra

This will create the cobra executable under your `$GOPATH/bin` directory.

### cobra init

The `cobra init [app]` command will create your initial application code
for you. It is a very powerful application that will populate your program with
the right structure so you can immediately enjoy all the benefits of Cobra. It
will also automatically apply the license you specify to your application.

Cobra init is pretty smart. You can provide it a full path, or simply a path
similar to what is expected in the import.

```
cobra init github.com/spf13/newApp
```

### cobra add

Once an application is initialized, Cobra can create additional commands for you.
Let's say you created an app and you wanted the following commands for it:

* app serve
* app config
* app config create

In your project directory (where your main.go file is) you would run the following:

```
cobra add serve
cobra add config
cobra add create -p 'configCmd'
```

*Note: Use camelCase (not snake_case/snake-case) for command names.
Otherwise, you will encounter errors.
For example, `cobra add add-user` is incorrect, but `cobra add addUser` is valid.*

Once you have run these three commands you would have an app structure similar to
the following:

```
  ▾ app/
    ▾ cmd/
        serve.go
        config.go
        create.go
      main.go
```

At this point you can run `go run main.go` and it would run your app. `go run
main.go serve`, `go run main.go config`, `go run main.go config create` along
with `go run main.go help serve`, etc. would all work.

Obviously you haven't added your own code to these yet. The commands are ready
for you to give them their tasks. Have fun!

### Configuring the cobra generator

The Cobra generator will be easier to use if you provide a simple configuration
file which will help you eliminate providing a bunch of repeated information in
flags over and over.

An example ~/.cobra.yaml file:

```yaml
author: Steve Francia <spf@spf13.com>
license: MIT
```

You can specify no license by setting `license` to `none` or you can specify
a custom license:

```yaml
license:
  header: This file is part of {{ .appName }}.
  text: |
    {{ .copyright }}

    This is my license. There are many like it, but this one is mine.
    My license is my best friend. It is my life. I must master it as I must
    master my life.
```

You can also use built-in licenses. For example, **GPLv2**, **GPLv3**, **LGPL**,
**AGPL**, **MIT**, **2-Clause BSD** or **3-Clause BSD**.


text:
// Copyright © 2015 Steve Francia <spf@spf13.com>.
//
// 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 (
	"fmt"

	homedir "github.com/mitchellh/go-homedir"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

var (
	// Used for flags.
	cfgFile, userLicense string

	rootCmd = &cobra.Command{
		Use:   "cobra",
		Short: "A generator for Cobra based Applications",
		Long: `Cobra is a CLI library for Go that empowers applications.
This application is a tool to generate the needed files
to quickly create a Cobra application.`,
	}
)

// Execute executes the root command.
func Execute() {
	rootCmd.Execute()
}

func init() {
	cobra.OnInitialize(initConfig)

	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.cobra.yaml)")
	rootCmd.PersistentFlags().StringP("author", "a", "YOUR NAME", "author name for copyright attribution")
	rootCmd.PersistentFlags().StringVarP(&userLicense, "license", "l", "", "name of license for the project")
	rootCmd.PersistentFlags().Bool("viper", true, "use Viper for configuration")
	viper.BindPFlag("author", rootCmd.PersistentFlags().Lookup("author"))
	viper.BindPFlag("useViper", rootCmd.PersistentFlags().Lookup("viper"))
	viper.SetDefault("author", "NAME HERE <EMAIL ADDRESS>")
	viper.SetDefault("license", "apache")

	rootCmd.AddCommand(addCmd)
	rootCmd.AddCommand(initCmd)
}

func initConfig() {
	if cfgFile != "" {
		// Use config file from the flag.
		viper.SetConfigFile(cfgFile)
	} else {
		// Find home directory.
		home, err := homedir.Dir()
		if err != nil {
			er(err)
		}

		// Search config in home directory with name ".cobra" (without extension).
		viper.AddConfigPath(home)
		viper.SetConfigName(".cobra")
	}

	viper.AutomaticEnv()

	if err := viper.ReadInConfig(); err == nil {
		fmt.Println("Using config file:", viper.ConfigFileUsed())
	}
}


text:
package cmd

import (
	"errors"
	"io/ioutil"
	"os"
	"path/filepath"
	"testing"

	"github.com/spf13/viper"
)

// TestGoldenInitCmd initializes the project "github.com/spf13/testproject"
// in GOPATH and compares the content of files in initialized project with
// appropriate golden files ("testdata/*.golden").
// Use -update to update existing golden files.
func TestGoldenInitCmd(t *testing.T) {
	projectName := "github.com/spf13/testproject"
	project := NewProject(projectName)
	defer os.RemoveAll(project.AbsPath())

	viper.Set("author", "NAME HERE <EMAIL ADDRESS>")
	viper.Set("license", "apache")
	viper.Set("year", 2017)
	defer viper.Set("author", nil)
	defer viper.Set("license", nil)
	defer viper.Set("year", nil)

	os.Args = []string{"cobra", "init", projectName}
	if err := rootCmd.Execute(); err != nil {
		t.Fatal("Error by execution:", err)
	}

	expectedFiles := []string{".", "cmd", "LICENSE", "main.go", "cmd/root.go"}
	gotFiles := []string{}

	// Check project file hierarchy and compare the content of every single file
	// with appropriate golden file.
	err := filepath.Walk(project.AbsPath(), func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		// Make path relative to project.AbsPath().
		// E.g. path = "/home/user/go/src/github.com/spf13/testproject/cmd/root.go"
		// then it returns just "cmd/root.go".
		relPath, err := filepath.Rel(project.AbsPath(), path)
		if err != nil {
			return err
		}
		relPath = filepath.ToSlash(relPath)
		gotFiles = append(gotFiles, relPath)
		goldenPath := filepath.Join("testdata", filepath.Base(path)+".golden")

		switch relPath {
		// Known directories.
		case ".", "cmd":
			return nil
		// Known files.
		case "LICENSE", "main.go", "cmd/root.go":
			if *update {
				got, err := ioutil.ReadFile(path)
				if err != nil {
					return err
				}
				if err := ioutil.WriteFile(goldenPath, got, 0644); err != nil {
					t.Fatal("Error while updating file:", err)
				}
			}
			return compareFiles(path, goldenPath)
		}
		// Unknown file.
		return errors.New("unknown file: " + path)
	})
	if err != nil {
		t.Fatal(err)
	}

	// Check if some files lack.
	if err := checkLackFiles(expectedFiles, gotFiles); err != nil {
		t.Fatal(err)
	}
}


text:
// Copyright © 2015 Steve Francia <spf@spf13.com>.
//
// 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.

// Parts inspired by https://github.com/ryanuber/go-license

package cmd

func initGpl2() {
	Licenses["gpl2"] = License{
		Name:            "GNU General Public License 2.0",
		PossibleMatches: []string{"gpl2", "gnu gpl2", "gplv2"},
		Header: `
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.`,
		Text: `                    GNU GENERAL PUBLIC LICENSE
                       Version 2, June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

                            Preamble

  The licenses for most software are designed to take away your
freedom to share and change it.  By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users.  This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it.  (Some other Free Software Foundation software is covered by
the GNU Lesser General Public License instead.)  You can apply it to
your programs, too.

  When we speak of free software, we are referring to freedom, not
price.  Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
if you want it, that you can change the software or use pieces of it
in new free programs; and that you know you can do these things.

  To protect your rights, we need to make restrictions that forbid
anyone to deny you these rights or to ask you to surrender the rights.
These restrictions translate to certain responsibilities for you if you
distribute copies of the software, or if you modify it.

  For example, if you distribute copies of such a program, whether
gratis or for a fee, you must give the recipients all the rights that
you have.  You must make sure that they, too, receive or can get the
source code.  And you must show them these terms so they know their
rights.

  We protect your rights with two steps: (1) copyright the software, and
(2) offer you this license which gives you legal permission to copy,
distribute and/or modify the software.

  Also, for each author's protection and ours, we want to make certain
that everyone understands that there is no warranty for this free
software.  If the software is modified by someone else and passed on, we
want its recipients to know that what they have is not the original, so
that any problems introduced by others will not reflect on the original
authors' reputations.

  Finally, any free program is threatened constantly by software
patents.  We wish to avoid the danger that redistributors of a free
program will individually obtain patent licenses, in effect making the
program proprietary.  To prevent this, we have made it clear that any
patent must be licensed for everyone's free use or not licensed at all.

  The precise terms and conditions for copying, distribution and
modification follow.

                    GNU GENERAL PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License.  The "Program", below,
refers to any such program or work, and a "work based on the Program"
means either the Program or any derivative work under copyright law:
that is to say, a work containing the Program or a portion of it,
either verbatim or with modifications and/or translated into another
language.  (Hereinafter, translation is included without limitation in
the term "modification".)  Each licensee is addressed as "you".

Activities other than copying, distribution and modification are not
covered by this License; they are outside its scope.  The act of
running the Program is not restricted, and the output from the Program
is covered only if its contents constitute a work based on the
Program (independent of having been made by running the Program).
Whether that is true depends on what the Program does.

  1. You may copy and distribute verbatim copies of the Program's
source code as you receive it, in any medium, provided that you
conspicuously and appropriately publish on each copy an appropriate
copyright notice and disclaimer of warranty; keep intact all the
notices that refer to this License and to the absence of any warranty;
and give any other recipients of the Program a copy of this License
along with the Program.

You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.

  2. You may modify your copy or copies of the Program or any portion
of it, thus forming a work based on the Program, and copy and
distribute such modifications or work under the terms of Section 1
above, provided that you also meet all of these conditions:

    a) You must cause the modified files to carry prominent notices
    stating that you changed the files and the date of any change.

    b) You must cause any work that you distribute or publish, that in
    whole or in part contains or is derived from the Program or any
    part thereof, to be licensed as a whole at no charge to all third
    parties under the terms of this License.

    c) If the modified program normally reads commands interactively
    when run, you must cause it, when started running for such
    interactive use in the most ordinary way, to print or display an
    announcement including an appropriate copyright notice and a
    notice that there is no warranty (or else, saying that you provide
    a warranty) and that users may redistribute the program under
    these conditions, and telling the user how to view a copy of this
    License.  (Exception: if the Program itself is interactive but
    does not normally print such an announcement, your work based on
    the Program is not required to print an announcement.)

These requirements apply to the modified work as a whole.  If
identifiable sections of that work are not derived from the Program,
and can be reasonably considered independent and separate works in
themselves, then this License, and its terms, do not apply to those
sections when you distribute them as separate works.  But when you
distribute the same sections as part of a whole which is a work based
on the Program, the distribution of the whole must be on the terms of
this License, whose permissions for other licensees extend to the
entire whole, and thus to each and every part regardless of who wrote it.

Thus, it is not the intent of this section to claim rights or contest
your rights to work written entirely by you; rather, the intent is to
exercise the right to control the distribution of derivative or
collective works based on the Program.

In addition, mere aggregation of another work not based on the Program
with the Program (or with a work based on the Program) on a volume of
a storage or distribution medium does not bring the other work under
the scope of this License.

  3. You may copy and distribute the Program (or a work based on it,
under Section 2) in object code or executable form under the terms of
Sections 1 and 2 above provided that you also do one of the following:

    a) Accompany it with the complete corresponding machine-readable
    source code, which must be distributed under the terms of Sections
    1 and 2 above on a medium customarily used for software interchange; or,

    b) Accompany it with a written offer, valid for at least three
    years, to give any third party, for a charge no more than your
    cost of physically performing source distribution, a complete
    machine-readable copy of the corresponding source code, to be
    distributed under the terms of Sections 1 and 2 above on a medium
    customarily used for software interchange; or,

    c) Accompany it with the information you received as to the offer
    to distribute corresponding source code.  (This alternative is
    allowed only for noncommercial distribution and only if you
    received the program in object code or executable form with such
    an offer, in accord with Subsection b above.)

The source code for a work means the preferred form of the work for
making modifications to it.  For an executable work, complete source
code means all the source code for all modules it contains, plus any
associated interface definition files, plus the scripts used to
control compilation and installation of the executable.  However, as a
special exception, the source code distributed need not include
anything that is normally distributed (in either source or binary
form) with the major components (compiler, kernel, and so on) of the
operating system on which the executable runs, unless that component
itself accompanies the executable.

If distribution of executable or object code is made by offering
access to copy from a designated place, then offering equivalent
access to copy the source code from the same place counts as
distribution of the source code, even though third parties are not
compelled to copy the source along with the object code.

  4. You may not copy, modify, sublicense, or distribute the Program
except as expressly provided under this License.  Any attempt
otherwise to copy, modify, sublicense or distribute the Program is
void, and will automatically terminate your rights under this License.
However, parties who have received copies, or rights, from you under
this License will not have their licenses terminated so long as such
parties remain in full compliance.

  5. You are not required to accept this License, since you have not
signed it.  However, nothing else grants you permission to modify or
distribute the Program or its derivative works.  These actions are
prohibited by law if you do not accept this License.  Therefore, by
modifying or distributing the Program (or any work based on the
Program), you indicate your acceptance of this License to do so, and
all its terms and conditions for copying, distributing or modifying
the Program or works based on it.

  6. Each time you redistribute the Program (or any work based on the
Program), the recipient automatically receives a license from the
original licensor to copy, distribute or modify the Program subject to
these terms and conditions.  You may not impose any further
restrictions on the recipients' exercise of the rights granted herein.
You are not responsible for enforcing compliance by third parties to
this License.

  7. If, as a consequence of a court judgment or allegation of patent
infringement or for any other reason (not limited to patent issues),
conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License.  If you cannot
distribute so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you
may not distribute the Program at all.  For example, if a patent
license would not permit royalty-free redistribution of the Program by
all those who receive copies directly or indirectly through you, then
the only way you could satisfy both it and this License would be to
refrain entirely from distribution of the Program.

If any portion of this section is held invalid or unenforceable under
any particular circumstance, the balance of the section is intended to
apply and the section as a whole is intended to apply in other
circumstances.

It is not the purpose of this section to induce you to infringe any
patents or other property right claims or to contest validity of any
such claims; this section has the sole purpose of protecting the
integrity of the free software distribution system, which is
implemented by public license practices.  Many people have made
generous contributions to the wide range of software distributed
through that system in reliance on consistent application of that
system; it is up to the author/donor to decide if he or she is willing
to distribute software through any other system and a licensee cannot
impose that choice.

This section is intended to make thoroughly clear what is believed to
be a consequence of the rest of this License.

  8. If the distribution and/or use of the Program is restricted in
certain countries either by patents or by copyrighted interfaces, the
original copyright holder who places the Program under this License
may add an explicit geographical distribution limitation excluding
those countries, so that distribution is permitted only in or among
countries not thus excluded.  In such case, this License incorporates
the limitation as if written in the body of this License.

  9. The Free Software Foundation may publish revised and/or new versions
of the General Public License from time to time.  Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.

Each version is given a distinguishing version number.  If the Program
specifies a version number of this License which applies to it and "any
later version", you have the option of following the terms and conditions
either of that version or of any later version published by the Free
Software Foundation.  If the Program does not specify a version number of
this License, you may choose any version ever published by the Free Software
Foundation.

  10. If you wish to incorporate parts of the Program into other free
programs whose distribution conditions are different, write to the author
to ask for permission.  For software which is copyrighted by the Free
Software Foundation, write to the Free Software Foundation; we sometimes
make exceptions for this.  Our decision will be guided by the two goals
of preserving the free status of all derivatives of our free software and
of promoting the sharing and reuse of software generally.

                            NO WARRANTY

  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
REPAIR OR CORRECTION.

  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.

                     END OF TERMS AND CONDITIONS

            How to Apply These Terms to Your New Programs

  If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.

  To do so, attach the following notices to the program.  It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.

    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

Also add information on how to contact you by electronic and paper mail.

If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:

    Gnomovision version 69, Copyright (C) year name of author
    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type 'show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type 'show c' for details.

The hypothetical commands 'show w' and 'show c' should show the appropriate
parts of the General Public License.  Of course, the commands you use may
be called something other than 'show w' and 'show c'; they could even be
mouse-clicks or menu items--whatever suits your program.

You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary.  Here is a sample; alter the names:

  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
  'Gnomovision' (which makes passes at compilers) written by James Hacker.

  <signature of Ty Coon>, 1 April 1989
  Ty Coon, President of Vice

This General Public License does not permit incorporating your program into
proprietary programs.  If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library.  If this is what you want to do, use the GNU Lesser General
Public License instead of this License.
`,
	}
}


text:
// Copyright © 2015 Steve Francia <spf@spf13.com>.
//
// 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.

// Parts inspired by https://github.com/ryanuber/go-license

package cmd

func initBsdClause2() {
	Licenses["freebsd"] = License{
		Name: "Simplified BSD License",
		PossibleMatches: []string{"freebsd", "simpbsd", "simple bsd", "2-clause bsd",
			"2 clause bsd", "simplified bsd license"},
		Header: `All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.`,
		Text: `{{ .copyright }}
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
`,
	}
}


text:
package cmd

func initLgpl() {
	Licenses["lgpl"] = License{
		Name:            "GNU Lesser General Public License",
		PossibleMatches: []string{"lgpl", "lesser gpl", "gnu lgpl"},
		Header: `
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.`,
		Text: `                   GNU LESSER GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

 Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

  This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.

  0. Additional Definitions.

  As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
General Public License.

  "The Library" refers to a covered work governed by this License,
other than an Application or a Combined Work as defined below.

  An "Application" is any work that makes use of an interface provided
by the Library, but which is not otherwise based on the Library.
Defining a subclass of a class defined by the Library is deemed a mode
of using an interface provided by the Library.

  A "Combined Work" is a work produced by combining or linking an
Application with the Library.  The particular version of the Library
with which the Combined Work was made is also called the "Linked
Version".

  The "Minimal Corresponding Source" for a Combined Work means the
Corresponding Source for the Combined Work, excluding any source code
for portions of the Combined Work that, considered in isolation, are
based on the Application, and not on the Linked Version.

  The "Corresponding Application Code" for a Combined Work means the
object code and/or source code for the Application, including any data
and utility programs needed for reproducing the Combined Work from the
Application, but excluding the System Libraries of the Combined Work.

  1. Exception to Section 3 of the GNU GPL.

  You may convey a covered work under sections 3 and 4 of this License
without being bound by section 3 of the GNU GPL.

  2. Conveying Modified Versions.

  If you modify a copy of the Library, and, in your modifications, a
facility refers to a function or data to be supplied by an Application
that uses the facility (other than as an argument passed when the
facility is invoked), then you may convey a copy of the modified
version:

   a) under this License, provided that you make a good faith effort to
   ensure that, in the event an Application does not supply the
   function or data, the facility still operates, and performs
   whatever part of its purpose remains meaningful, or

   b) under the GNU GPL, with none of the additional permissions of
   this License applicable to that copy.

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   a) Give prominent notice with each copy of the object code that the
   Library is used in it and that the Library and its use are
   covered by this License.

   b) Accompany the object code with a copy of the GNU GPL and this license
   document.

  4. Combined Works.

  You may convey a Combined Work under terms of your choice that,
taken together, effectively do not restrict modification of the
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the following:

   a) Give prominent notice with each copy of the Combined Work that
   the Library is used in it and that the Library and its use are
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       0) Convey the Minimal Corresponding Source under the terms of this
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       suitable for, and under terms that permit, the user to
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   for conveying Corresponding Source.)

  5. Combined Libraries.

  You may place library facilities that are a work based on the
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   a) Accompany the combined library with a copy of the same work based
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   b) Give prominent notice with the combined library that part of it
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  6. Revised Versions of the GNU Lesser General Public License.

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  Each version is given a distinguishing version number. If the
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	}
}


text:
// Copyright © 2015 Steve Francia <spf@spf13.com>.
//
// 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 (
	"fmt"
	"os"
	"path/filepath"
	"unicode"

	"github.com/spf13/cobra"
)

func init() {
	addCmd.Flags().StringVarP(&packageName, "package", "t", "", "target package name (e.g. github.com/spf13/hugo)")
	addCmd.Flags().StringVarP(&parentName, "parent", "p", "rootCmd", "variable name of parent command for this command")
}

var packageName, parentName string

var addCmd = &cobra.Command{
	Use:     "add [command name]",
	Aliases: []string{"command"},
	Short:   "Add a command to a Cobra Application",
	Long: `Add (cobra add) will create a new command, with a license and
the appropriate structure for a Cobra-based CLI application,
and register it to its parent (default rootCmd).

If you want your command to be public, pass in the command name
with an initial uppercase letter.

Example: cobra add server -> resulting in a new cmd/server.go`,

	Run: func(cmd *cobra.Command, args []string) {
		if len(args) < 1 {
			er("add needs a name for the command")
		}

		var project *Project
		if packageName != "" {
			project = NewProject(packageName)
		} else {
			wd, err := os.Getwd()
			if err != nil {
				er(err)
			}
			project = NewProjectFromPath(wd)
		}

		cmdName := validateCmdName(args[0])
		cmdPath := filepath.Join(project.CmdPath(), cmdName+".go")
		createCmdFile(project.License(), cmdPath, cmdName)

		fmt.Fprintln(cmd.OutOrStdout(), cmdName, "created at", cmdPath)
	},
}

// validateCmdName returns source without any dashes and underscore.
// If there will be dash or underscore, next letter will be uppered.
// It supports only ASCII (1-byte character) strings.
// https://github.com/spf13/cobra/issues/269
func validateCmdName(source string) string {
	i := 0
	l := len(source)
	// The output is initialized on demand, then first dash or underscore
	// occurs.
	var output string

	for i < l {
		if source[i] == '-' || source[i] == '_' {
			if output == "" {
				output = source[:i]
			}

			// If it's last rune and it's dash or underscore,
			// don't add it output and break the loop.
			if i == l-1 {
				break
			}

			// If next character is dash or underscore,
			// just skip the current character.
			if source[i+1] == '-' || source[i+1] == '_' {
				i++
				continue
			}

			// If the current character is dash or underscore,
			// upper next letter and add to output.
			output += string(unicode.ToUpper(rune(source[i+1])))
			// We know, what source[i] is dash or underscore and source[i+1] is
			// uppered character, so make i = i+2.
			i += 2
			continue
		}

		// If the current character isn't dash or underscore,
		// just add it.
		if output != "" {
			output += string(source[i])
		}
		i++
	}

	if output == "" {
		return source // source is initially valid name.
	}
	return output
}

func createCmdFile(license License, path, cmdName string) {
	template := `{{comment .copyright}}
{{if .license}}{{comment .license}}{{end}}

package {{.cmdPackage}}

import (
	"fmt"

	"github.com/spf13/cobra"
)

// {{.cmdName}}Cmd represents the {{.cmdName}} command
var {{.cmdName}}Cmd = &cobra.Command{
	Use:   "{{.cmdName}}",
	Short: "A brief description of your command",
	Long: ` + "`" + `A longer description that spans multiple lines and likely contains examples
and usage of using your command. For example:

Cobra is a CLI library for Go that empowers applications.
This application is a tool to generate the needed files
to quickly create a Cobra application.` + "`" + `,
	Run: func(cmd *cobra.Command, args []string) {
		fmt.Println("{{.cmdName}} called")
	},
}

func init() {
	{{.parentName}}.AddCommand({{.cmdName}}Cmd)

	// Here you will define your flags and configuration settings.

	// Cobra supports Persistent Flags which will work for this command
	// and all subcommands, e.g.:
	// {{.cmdName}}Cmd.PersistentFlags().String("foo", "", "A help for foo")

	// Cobra supports local flags which will only run when this command
	// is called directly, e.g.:
	// {{.cmdName}}Cmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
}
`

	data := make(map[string]interface{})
	data["copyright"] = copyrightLine()
	data["license"] = license.Header
	data["cmdPackage"] = filepath.Base(filepath.Dir(path)) // last dir of path
	data["parentName"] = parentName
	data["cmdName"] = cmdName

	cmdScript, err := executeTemplate(template, data)
	if err != nil {
		er(err)
	}
	err = writeStringToFile(path, cmdScript)
	if err != nil {
		er(err)
	}
}