Repository: spf13/cobra
Pull request #1377 (2021-04-16 14:26:27)

Add Meroxa CLI
👋,

I'm reaching out in behalf of [Meroxa](https://meroxa.com/) as one of its developers. We've been using [Cobra](https://github.com/spf13/cobra) since our first [initial commit](https://github.com/meroxa/cli/commit/a3301a0199df4c77a9cabf1662f7858110d387e5) back from January 2020, and we recently [launched our Platform](https://techcrunch.com/2021/04/13/meroxa-raises-15m-series-a-for-its-real-time-data-platform/) to the public.

We continue considering using Cobra as our CLI framework and are [actively](https://github.com/meroxa/cli/releases) working on it, and it'd be really nice to be featured as one of the projects using Cobra in the wild.

Thank you!

CLAassistant: [![CLA assistant check](https://cla-assistant.io/pull/badge/not_signed)](https://cla-assistant.io/spf13/cobra?pullRequest=1377) <br/>Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our [Contributor License Agreement](https://cla-assistant.io/spf13/cobra?pullRequest=1377) before we can accept your contribution.<br/><sub>You have signed the CLA already but the status is still pending? Let us [recheck](https://cla-assistant.io/check/spf13/cobra?pullRequest=1377) it.</sub>
raulb: Looks like the `MINGW64` check will be  be solved by https://github.com/spf13/cobra/pull/1366 so I'll rebase and will re-run CI once it gets merged.
raulb: @marckhouzam @jpmcb Just updated with latest from master and all checks are passing now. Looks like this should be good to go! Thank you 🙏 .

Patch:
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 0821efd..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,28 +0,0 @@
-language: go
-
-stages:
-  - test
-  - build
-
-go:
-  - 1.14.x
-  - 1.15.x
-  - tip
-
-env: GO111MODULE=on
-
-before_install:
-  - go get -u github.com/kyoh86/richgo
-  - go get -u github.com/mitchellh/gox
-  - curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin latest
-
-matrix:
-  allow_failures:
-    - go: tip
-  include:
-    - stage: build
-      go: 1.14.x
-      script: make cobra_generator
-
-script:
- - make test
diff --git a/README.md b/README.md
index a1b13dd..074e397 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,6 @@ Cobra is used in many Go projects such as [Kubernetes](http://kubernetes.io/),
 name a few. [This list](./projects_using_cobra.md) contains a more extensive list of projects using Cobra.
 
 [![](https://img.shields.io/github/workflow/status/spf13/cobra/Test?longCache=tru&label=Test&logo=github%20actions&logoColor=fff)](https://github.com/spf13/cobra/actions?query=workflow%3ATest)
-[![Build Status](https://travis-ci.org/spf13/cobra.svg "Travis CI status")](https://travis-ci.org/spf13/cobra)
 [![GoDoc](https://godoc.org/github.com/spf13/cobra?status.svg)](https://godoc.org/github.com/spf13/cobra)
 [![Go Report Card](https://goreportcard.com/badge/github.com/spf13/cobra)](https://goreportcard.com/report/github.com/spf13/cobra)
 [![Slack](https://img.shields.io/badge/Slack-cobra-brightgreen)](https://gophers.slack.com/archives/CD3LP1199)
@@ -19,18 +18,18 @@ name a few. [This list](./projects_using_cobra.md) contains a more extensive lis
   * [Commands](#commands)
   * [Flags](#flags)
 - [Installing](#installing)
-- [Getting Started](#getting-started)
-  * [Using the Cobra Generator](#using-the-cobra-generator)
-  * [Using the Cobra Library](#using-the-cobra-library)
-  * [Working with Flags](#working-with-flags)
-  * [Positional and Custom Arguments](#positional-and-custom-arguments)
-  * [Example](#example)
-  * [Help Command](#help-command)
-  * [Usage Message](#usage-message)
-  * [PreRun and PostRun Hooks](#prerun-and-postrun-hooks)
-  * [Suggestions when "unknown command" happens](#suggestions-when-unknown-command-happens)
-  * [Generating documentation for your command](#generating-documentation-for-your-command)
-  * [Generating shell completions](#generating-shell-completions)
+- [Usage](#usage)
+  * [Using the Cobra Generator](user_guide.md#using-the-cobra-generator)
+  * [Using the Cobra Library](user_guide.md#using-the-cobra-library)
+  * [Working with Flags](user_guide.md#working-with-flags)
+  * [Positional and Custom Arguments](user_guide.md#positional-and-custom-arguments)
+  * [Example](user_guide.md#example)
+  * [Help Command](user_guide.md#help-command)
+  * [Usage Message](user_guide.md#usage-message)
+  * [PreRun and PostRun Hooks](user_guide.md#prerun-and-postrun-hooks)
+  * [Suggestions when "unknown command" happens](user_guide.md#suggestions-when-unknown-command-happens)
+  * [Generating documentation for your command](user_guide.md#generating-documentation-for-your-command)
+  * [Generating shell completions](user_guide.md#generating-shell-completions)
 - [Contributing](CONTRIBUTING.md)
 - [License](#license)
 
@@ -117,643 +116,9 @@ Next, include Cobra in your application:
 import "github.com/spf13/cobra"
 ```
 
-# Getting Started
+# Usage
 
-While you are welcome to provide your own organization, typically a Cobra-based
-application will follow the following organizational structure:
-
-```
-  ▾ appName/
-    ▾ cmd/
-        add.go
-        your.go
-        commands.go
-        here.go
-      main.go
-```
-
-In a Cobra app, typically the main.go file is very bare. It serves one purpose: initializing Cobra.
-
-```go
-package main
-
-import (
-  "{pathToYourApp}/cmd"
-)
-
-func main() {
-  cmd.Execute()
-}
-```
-
-## Using the 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.
-
-[Here](https://github.com/spf13/cobra/blob/master/cobra/README.md) you can find more information about it.
-
-## Using the Cobra Library
-
-To manually implement Cobra you need to create a bare main.go file and a rootCmd file.
-You will optionally provide additional commands as you see fit.
-
-### Create rootCmd
-
-Cobra doesn't require any special constructors. Simply create your commands.
-
-Ideally you place this in app/cmd/root.go:
-
-```go
-var rootCmd = &cobra.Command{
-  Use:   "hugo",
-  Short: "Hugo is a very fast static site generator",
-  Long: `A Fast and Flexible Static Site Generator built with
-                love by spf13 and friends in Go.
-                Complete documentation is available at http://hugo.spf13.com`,
-  Run: func(cmd *cobra.Command, args []string) {
-    // Do Stuff Here
-  },
-}
-
-func Execute() {
-  if err := rootCmd.Execute(); err != nil {
-    fmt.Fprintln(os.Stderr, err)
-    os.Exit(1)
-  }
-}
-```
-
-You will additionally define flags and handle configuration in your init() function.
-
-For example cmd/root.go:
-
-```go
-package cmd
-
-import (
-	"fmt"
-	"os"
-
-	homedir "github.com/mitchellh/go-homedir"
-	"github.com/spf13/cobra"
-	"github.com/spf13/viper"
-)
-
-var (
-	// Used for flags.
-	cfgFile     string
-	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() error {
-	return 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()
-		cobra.CheckErr(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())
-	}
-}
-```
-
-### Create your main.go
-
-With the root command you need to have your main function execute it.
-Execute should be run on the root for clarity, though it can be called on any command.
-
-In a Cobra app, typically the main.go file is very bare. It serves one purpose: to initialize Cobra.
-
-```go
-package main
-
-import (
-  "{pathToYourApp}/cmd"
-)
-
-func main() {
-  cmd.Execute()
-}
-```
-
-### Create additional commands
-
-Additional commands can be defined and typically are each given their own file
-inside of the cmd/ directory.
-
-If you wanted to create a version command you would create cmd/version.go and
-populate it with the following:
-
-```go
-package cmd
-
-import (
-  "fmt"
-
-  "github.com/spf13/cobra"
-)
-
-func init() {
-  rootCmd.AddCommand(versionCmd)
-}
-
-var versionCmd = &cobra.Command{
-  Use:   "version",
-  Short: "Print the version number of Hugo",
-  Long:  `All software has versions. This is Hugo's`,
-  Run: func(cmd *cobra.Command, args []string) {
-    fmt.Println("Hugo Static Site Generator v0.9 -- HEAD")
-  },
-}
-```
-
-### Returning and handling errors
-
-If you wish to return an error to the caller of a command, `RunE` can be used.
-
-```go
-package cmd
-
-import (
-  "fmt"
-
-  "github.com/spf13/cobra"
-)
-
-func init() {
-  rootCmd.AddCommand(tryCmd)
-}
-
-var tryCmd = &cobra.Command{
-  Use:   "try",
-  Short: "Try and possibly fail at something",
-  RunE: func(cmd *cobra.Command, args []string) error {
-    if err := someFunc(); err != nil {
-	return err
-    }
-    return nil
-  },
-}
-```
-
-The error can then be caught at the execute function call.
-
-## Working with Flags
-
-Flags provide modifiers to control how the action command operates.
-
-### Assign flags to a command
-
-Since the flags are defined and used in different locations, we need to
-define a variable outside with the correct scope to assign the flag to
-work with.
-
-```go
-var Verbose bool
-var Source string
-```
-
-There are two different approaches to assign a flag.
-
-### Persistent Flags
-
-A flag can be 'persistent', meaning that this flag will be available to the
-command it's assigned to as well as every command under that command. For
-global flags, assign a flag as a persistent flag on the root.
-
-```go
-rootCmd.PersistentFlags().BoolVarP(&Verbose, "verbose", "v", false, "verbose output")
-```
-
-### Local Flags
-
-A flag can also be assigned locally, which will only apply to that specific command.
-
-```go
-localCmd.Flags().StringVarP(&Source, "source", "s", "", "Source directory to read from")
-```
-
-### Local Flag on Parent Commands
-
-By default, Cobra only parses local flags on the target command, and any local flags on
-parent commands are ignored. By enabling `Command.TraverseChildren`, Cobra will
-parse local flags on each command before executing the target command.
-
-```go
-command := cobra.Command{
-  Use: "print [OPTIONS] [COMMANDS]",
-  TraverseChildren: true,
-}
-```
-
-### Bind Flags with Config
-
-You can also bind your flags with [viper](https://github.com/spf13/viper):
-```go
-var author string
-
-func init() {
-  rootCmd.PersistentFlags().StringVar(&author, "author", "YOUR NAME", "Author name for copyright attribution")
-  viper.BindPFlag("author", rootCmd.PersistentFlags().Lookup("author"))
-}
-```
-
-In this example, the persistent flag `author` is bound with `viper`.
-**Note**: the variable `author` will not be set to the value from config,
-when the `--author` flag is not provided by user.
-
-More in [viper documentation](https://github.com/spf13/viper#working-with-flags).
-
-### Required flags
-
-Flags are optional by default. If instead you wish your command to report an error
-when a flag has not been set, mark it as required:
-```go
-rootCmd.Flags().StringVarP(&Region, "region", "r", "", "AWS region (required)")
-rootCmd.MarkFlagRequired("region")
-```
-
-Or, for persistent flags:
-```go
-rootCmd.PersistentFlags().StringVarP(&Region, "region", "r", "", "AWS region (required)")
-rootCmd.MarkPersistentFlagRequired("region")
-```
-
-## Positional and Custom Arguments
-
-Validation of positional arguments can be specified using the `Args` field
-of `Command`.
-
-The following validators are built in:
-
-- `NoArgs` - the command will report an error if there are any positional args.
-- `ArbitraryArgs` - the command will accept any args.
-- `OnlyValidArgs` - the command will report an error if there are any positional args that are not in the `ValidArgs` field of `Command`.
-- `MinimumNArgs(int)` - the command will report an error if there are not at least N positional args.
-- `MaximumNArgs(int)` - the command will report an error if there are more than N positional args.
-- `ExactArgs(int)` - the command will report an error if there are not exactly N positional args.
-- `ExactValidArgs(int)` - the command will report an error if there are not exactly N positional args OR if there are any positional args that are not in the `ValidArgs` field of `Command`
-- `RangeArgs(min, max)` - the command will report an error if the number of args is not between the minimum and maximum number of expected args.
-
-An example of setting the custom validator:
-
-```go
-var cmd = &cobra.Command{
-  Short: "hello",
-  Args: func(cmd *cobra.Command, args []string) error {
-    if len(args) < 1 {
-      return errors.New("requires a color argument")
-    }
-    if myapp.IsValidColor(args[0]) {
-      return nil
-    }
-    return fmt.Errorf("invalid color specified: %s", args[0])
-  },
-  Run: func(cmd *cobra.Command, args []string) {
-    fmt.Println("Hello, World!")
-  },
-}
-```
-
-## Example
-
-In the example below, we have defined three commands. Two are at the top level
-and one (cmdTimes) is a child of one of the top commands. In this case the root
-is not executable, meaning that a subcommand is required. This is accomplished
-by not providing a 'Run' for the 'rootCmd'.
-
-We have only defined one flag for a single command.
-
-More documentation about flags is available at https://github.com/spf13/pflag
-
-```go
-package main
-
-import (
-  "fmt"
-  "strings"
-
-  "github.com/spf13/cobra"
-)
-
-func main() {
-  var echoTimes int
-
-  var cmdPrint = &cobra.Command{
-    Use:   "print [string to print]",
-    Short: "Print anything to the screen",
-    Long: `print is for printing anything back to the screen.
-For many years people have printed back to the screen.`,
-    Args: cobra.MinimumNArgs(1),
-    Run: func(cmd *cobra.Command, args []string) {
-      fmt.Println("Print: " + strings.Join(args, " "))
-    },
-  }
-
-  var cmdEcho = &cobra.Command{
-    Use:   "echo [string to echo]",
-    Short: "Echo anything to the screen",
-    Long: `echo is for echoing anything back.
-Echo works a lot like print, except it has a child command.`,
-    Args: cobra.MinimumNArgs(1),
-    Run: func(cmd *cobra.Command, args []string) {
-      fmt.Println("Echo: " + strings.Join(args, " "))
-    },
-  }
-
-  var cmdTimes = &cobra.Command{
-    Use:   "times [string to echo]",
-    Short: "Echo anything to the screen more times",
-    Long: `echo things multiple times back to the user by providing
-a count and a string.`,
-    Args: cobra.MinimumNArgs(1),
-    Run: func(cmd *cobra.Command, args []string) {
-      for i := 0; i < echoTimes; i++ {
-        fmt.Println("Echo: " + strings.Join(args, " "))
-      }
-    },
-  }
-
-  cmdTimes.Flags().IntVarP(&echoTimes, "times", "t", 1, "times to echo the input")
-
-  var rootCmd = &cobra.Command{Use: "app"}
-  rootCmd.AddCommand(cmdPrint, cmdEcho)
-  cmdEcho.AddCommand(cmdTimes)
-  rootCmd.Execute()
-}
-```
-
-For a more complete example of a larger application, please checkout [Hugo](http://gohugo.io/).
-
-## Help Command
-
-Cobra automatically adds a help command to your application when you have subcommands.
-This will be called when a user runs 'app help'. Additionally, help will also
-support all other commands as input. Say, for instance, you have a command called
-'create' without any additional configuration; Cobra will work when 'app help
-create' is called.  Every command will automatically have the '--help' flag added.
-
-### Example
-
-The following output is automatically generated by Cobra. Nothing beyond the
-command and flag definitions are needed.
-
-    $ cobra help
-
-    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.
-
-    Usage:
-      cobra [command]
-
-    Available Commands:
-      add         Add a command to a Cobra Application
-      help        Help about any command
-      init        Initialize a Cobra Application
-
-    Flags:
-      -a, --author string    author name for copyright attribution (default "YOUR NAME")
-          --config string    config file (default is $HOME/.cobra.yaml)
-      -h, --help             help for cobra
-      -l, --license string   name of license for the project
-          --viper            use Viper for configuration (default true)
-
-    Use "cobra [command] --help" for more information about a command.
-
-
-Help is just a command like any other. There is no special logic or behavior
-around it. In fact, you can provide your own if you want.
-
-### Defining your own help
-
-You can provide your own Help command or your own template for the default command to use
-with following functions:
-
-```go
-cmd.SetHelpCommand(cmd *Command)
-cmd.SetHelpFunc(f func(*Command, []string))
-cmd.SetHelpTemplate(s string)
-```
-
-The latter two will also apply to any children commands.
-
-## Usage Message
-
-When the user provides an invalid flag or invalid command, Cobra responds by
-showing the user the 'usage'.
-
-### Example
-You may recognize this from the help above. That's because the default help
-embeds the usage as part of its output.
-
-    $ cobra --invalid
-    Error: unknown flag: --invalid
-    Usage:
-      cobra [command]
-
-    Available Commands:
-      add         Add a command to a Cobra Application
-      help        Help about any command
-      init        Initialize a Cobra Application
-
-    Flags:
-      -a, --author string    author name for copyright attribution (default "YOUR NAME")
-          --config string    config file (default is $HOME/.cobra.yaml)
-      -h, --help             help for cobra
-      -l, --license string   name of license for the project
-          --viper            use Viper for configuration (default true)
-
-    Use "cobra [command] --help" for more information about a command.
-
-### Defining your own usage
-You can provide your own usage function or template for Cobra to use.
-Like help, the function and template are overridable through public methods:
-
-```go
-cmd.SetUsageFunc(f func(*Command) error)
-cmd.SetUsageTemplate(s string)
-```
-
-## Version Flag
-
-Cobra adds a top-level '--version' flag if the Version field is set on the root command.
-Running an application with the '--version' flag will print the version to stdout using
-the version template. The template can be customized using the
-`cmd.SetVersionTemplate(s string)` function.
-
-## PreRun and PostRun Hooks
-
-It is possible to run functions before or after the main `Run` function of your command. The `PersistentPreRun` and `PreRun` functions will be executed before `Run`. `PersistentPostRun` and `PostRun` will be executed after `Run`.  The `Persistent*Run` functions will be inherited by children if they do not declare their own.  These functions are run in the following order:
-
-- `PersistentPreRun`
-- `PreRun`
-- `Run`
-- `PostRun`
-- `PersistentPostRun`
-
-An example of two commands which use all of these features is below.  When the subcommand is executed, it will run the root command's `PersistentPreRun` but not the root command's `PersistentPostRun`:
-
-```go
-package main
-
-import (
-  "fmt"
-
-  "github.com/spf13/cobra"
-)
-
-func main() {
-
-  var rootCmd = &cobra.Command{
-    Use:   "root [sub]",
-    Short: "My root command",
-    PersistentPreRun: func(cmd *cobra.Command, args []string) {
-      fmt.Printf("Inside rootCmd PersistentPreRun with args: %v\n", args)
-    },
-    PreRun: func(cmd *cobra.Command, args []string) {
-      fmt.Printf("Inside rootCmd PreRun with args: %v\n", args)
-    },
-    Run: func(cmd *cobra.Command, args []string) {
-      fmt.Printf("Inside rootCmd Run with args: %v\n", args)
-    },
-    PostRun: func(cmd *cobra.Command, args []string) {
-      fmt.Printf("Inside rootCmd PostRun with args: %v\n", args)
-    },
-    PersistentPostRun: func(cmd *cobra.Command, args []string) {
-      fmt.Printf("Inside rootCmd PersistentPostRun with args: %v\n", args)
-    },
-  }
-
-  var subCmd = &cobra.Command{
-    Use:   "sub [no options!]",
-    Short: "My subcommand",
-    PreRun: func(cmd *cobra.Command, args []string) {
-      fmt.Printf("Inside subCmd PreRun with args: %v\n", args)
-    },
-    Run: func(cmd *cobra.Command, args []string) {
-      fmt.Printf("Inside subCmd Run with args: %v\n", args)
-    },
-    PostRun: func(cmd *cobra.Command, args []string) {
-      fmt.Printf("Inside subCmd PostRun with args: %v\n", args)
-    },
-    PersistentPostRun: func(cmd *cobra.Command, args []string) {
-      fmt.Printf("Inside subCmd PersistentPostRun with args: %v\n", args)
-    },
-  }
-
-  rootCmd.AddCommand(subCmd)
-
-  rootCmd.SetArgs([]string{""})
-  rootCmd.Execute()
-  fmt.Println()
-  rootCmd.SetArgs([]string{"sub", "arg1", "arg2"})
-  rootCmd.Execute()
-}
-```
-
-Output:
-```
-Inside rootCmd PersistentPreRun with args: []
-Inside rootCmd PreRun with args: []
-Inside rootCmd Run with args: []
-Inside rootCmd PostRun with args: []
-Inside rootCmd PersistentPostRun with args: []
-
-Inside rootCmd PersistentPreRun with args: [arg1 arg2]
-Inside subCmd PreRun with args: [arg1 arg2]
-Inside subCmd Run with args: [arg1 arg2]
-Inside subCmd PostRun with args: [arg1 arg2]
-Inside subCmd PersistentPostRun with args: [arg1 arg2]
-```
-
-## Suggestions when "unknown command" happens
-
-Cobra will print automatic suggestions when "unknown command" errors happen. This allows Cobra to behave similarly to the `git` command when a typo happens. For example:
-
-```
-$ hugo srever
-Error: unknown command "srever" for "hugo"
-
-Did you mean this?
-        server
-
-Run 'hugo --help' for usage.
-```
-
-Suggestions are automatic based on every subcommand registered and use an implementation of [Levenshtein distance](http://en.wikipedia.org/wiki/Levenshtein_distance). Every registered command that matches a minimum distance of 2 (ignoring case) will be displayed as a suggestion.
-
-If you need to disable suggestions or tweak the string distance in your command, use:
-
-```go
-command.DisableSuggestions = true
-```
-
-or
-
-```go
-command.SuggestionsMinimumDistance = 1
-```
-
-You can also explicitly set names for which a given command will be suggested using the `SuggestFor` attribute. This allows suggestions for strings that are not close in terms of string distance, but makes sense in your set of commands and for some which you don't want aliases. Example:
-
-```
-$ kubectl remove
-Error: unknown command "remove" for "kubectl"
-
-Did you mean this?
-        delete
-
-Run 'kubectl help' for usage.
-```
-
-## Generating documentation for your command
-
-Cobra can generate documentation based on subcommands, flags, etc. Read more about it in the [docs generation documentation](doc/README.md).
-
-## Generating shell completions
-
-Cobra can generate a shell-completion file for the following shells: bash, zsh, fish, PowerShell. If you add more information to your commands, these completions can be amazingly powerful and flexible.  Read more about it in [Shell Completions](shell_completions.md).
+See [User Guide](user_guide.md).
 
 # License
 
diff --git a/bash_completions.go b/bash_completions.go
index b47f898..733f4d1 100644
--- a/bash_completions.go
+++ b/bash_completions.go
@@ -512,6 +512,8 @@ func writeLocalNonPersistentFlag(buf io.StringWriter, flag *pflag.Flag) {
 
 // Setup annotations for go completions for registered flags
 func prepareCustomAnnotationsForFlags(cmd *Command) {
+	flagCompletionMutex.RLock()
+	defer flagCompletionMutex.RUnlock()
 	for flag := range flagCompletionFunctions {
 		// Make sure the completion script calls the __*_go_custom_completion function for
 		// every registered flag.  We need to do this here (and not when the flag was registered
diff --git a/bash_completions.md b/bash_completions.md
index 130f99b..52919b2 100644
--- a/bash_completions.md
+++ b/bash_completions.md
@@ -6,6 +6,8 @@ Please refer to [Shell Completions](shell_completions.md) for details.
 
 For backward compatibility, Cobra still supports its legacy dynamic completion solution (described below).  Unlike the `ValidArgsFunction` solution, the legacy solution will only work for Bash shell-completion and not for other shells. This legacy solution can be used along-side `ValidArgsFunction` and `RegisterFlagCompletionFunc()`, as long as both solutions are not used for the same command.  This provides a path to gradually migrate from the legacy solution to the new solution.
 
+**Note**: Cobra's default `completion` command uses bash completion V2.  If you are currently using Cobra's legacy dynamic completion solution, you should not use the default `completion` command but continue using your own.
+
 The legacy solution allows you to inject bash functions into the bash completion script.  Those bash functions are responsible for providing the completion choices for your own completions.
 
 Some code that works in kubernetes:
diff --git a/bash_completionsV2.go b/bash_completionsV2.go
new file mode 100644
index 0000000..8859b57
--- /dev/null
+++ b/bash_completionsV2.go
@@ -0,0 +1,302 @@
+package cobra
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+)
+
+func (c *Command) genBashCompletion(w io.Writer, includeDesc bool) error {
+	buf := new(bytes.Buffer)
+	genBashComp(buf, c.Name(), includeDesc)
+	_, err := buf.WriteTo(w)
+	return err
+}
+
+func genBashComp(buf io.StringWriter, name string, includeDesc bool) {
+	compCmd := ShellCompRequestCmd
+	if !includeDesc {
+		compCmd = ShellCompNoDescRequestCmd
+	}
+
+	WriteStringAndCheck(buf, fmt.Sprintf(`# bash completion V2 for %-36[1]s -*- shell-script -*-
+
+__%[1]s_debug()
+{
+    if [[ -n ${BASH_COMP_DEBUG_FILE:-} ]]; then
+        echo "$*" >> "${BASH_COMP_DEBUG_FILE}"
+    fi
+}
+
+# Macs have bash3 for which the bash-completion package doesn't include
+# _init_completion. This is a minimal version of that function.
+__%[1]s_init_completion()
+{
+    COMPREPLY=()
+    _get_comp_words_by_ref "$@" cur prev words cword
+}
+
+# This function calls the %[1]s program to obtain the completion
+# results and the directive.  It fills the 'out' and 'directive' vars.
+__%[1]s_get_completion_results() {
+    local requestComp lastParam lastChar args
+
+    # Prepare the command to request completions for the program.
+    # Calling ${words[0]} instead of directly %[1]s allows to handle aliases
+    args=("${words[@]:1}")
+    requestComp="${words[0]} %[2]s ${args[*]}"
+
+    lastParam=${words[$((${#words[@]}-1))]}
+    lastChar=${lastParam:$((${#lastParam}-1)):1}
+    __%[1]s_debug "lastParam ${lastParam}, lastChar ${lastChar}"
+
+    if [ -z "${cur}" ] && [ "${lastChar}" != "=" ]; then
+        # If the last parameter is complete (there is a space following it)
+        # We add an extra empty parameter so we can indicate this to the go method.
+        __%[1]s_debug "Adding extra empty parameter"
+        requestComp="${requestComp} ''"
+    fi
+
+    # When completing a flag with an = (e.g., %[1]s -n=<TAB>)
+    # bash focuses on the part after the =, so we need to remove
+    # the flag part from $cur
+    if [[ "${cur}" == -*=* ]]; then
+        cur="${cur#*=}"
+    fi
+
+    __%[1]s_debug "Calling ${requestComp}"
+    # Use eval to handle any environment variables and such
+    out=$(eval "${requestComp}" 2>/dev/null)
+
+    # Extract the directive integer at the very end of the output following a colon (:)
+    directive=${out##*:}
+    # Remove the directive
+    out=${out%%:*}
+    if [ "${directive}" = "${out}" ]; then
+        # There is not directive specified
+        directive=0
+    fi
+    __%[1]s_debug "The completion directive is: ${directive}"
+    __%[1]s_debug "The completions are: ${out[*]}"
+}
+
+__%[1]s_process_completion_results() {
+    local shellCompDirectiveError=%[3]d
+    local shellCompDirectiveNoSpace=%[4]d
+    local shellCompDirectiveNoFileComp=%[5]d
+    local shellCompDirectiveFilterFileExt=%[6]d
+    local shellCompDirectiveFilterDirs=%[7]d
+
+    if [ $((directive & shellCompDirectiveError)) -ne 0 ]; then
+        # Error code.  No completion.
+        __%[1]s_debug "Received error from custom completion go code"
+        return
+    else
+        if [ $((directive & shellCompDirectiveNoSpace)) -ne 0 ]; then
+            if [[ $(type -t compopt) = "builtin" ]]; then
+                __%[1]s_debug "Activating no space"
+                compopt -o nospace
+            else
+                __%[1]s_debug "No space directive not supported in this version of bash"
+            fi
+        fi
+        if [ $((directive & shellCompDirectiveNoFileComp)) -ne 0 ]; then
+            if [[ $(type -t compopt) = "builtin" ]]; then
+                __%[1]s_debug "Activating no file completion"
+                compopt +o default
+            else
+                __%[1]s_debug "No file completion directive not supported in this version of bash"
+            fi
+        fi
+    fi
+
+    if [ $((directive & shellCompDirectiveFilterFileExt)) -ne 0 ]; then
+        # File extension filtering
+        local fullFilter filter filteringCmd
+
+        # Do not use quotes around the $out variable or else newline
+        # characters will be kept.
+        for filter in ${out[*]}; do
+            fullFilter+="$filter|"
+        done
+
+        filteringCmd="_filedir $fullFilter"
+        __%[1]s_debug "File filtering command: $filteringCmd"
+        $filteringCmd
+    elif [ $((directive & shellCompDirectiveFilterDirs)) -ne 0 ]; then
+        # File completion for directories only
+
+        # Use printf to strip any trailing newline
+        local subdir
+        subdir=$(printf "%%s" "${out[0]}")
+        if [ -n "$subdir" ]; then
+            __%[1]s_debug "Listing directories in $subdir"
+            pushd "$subdir" >/dev/null 2>&1 && _filedir -d && popd >/dev/null 2>&1 || return
+        else
+            __%[1]s_debug "Listing directories in ."
+            _filedir -d
+        fi
+    else
+        __%[1]s_handle_standard_completion_case
+    fi
+
+    __%[1]s_handle_special_char "$cur" :
+    __%[1]s_handle_special_char "$cur" =
+}
+
+__%[1]s_handle_standard_completion_case() {
+    local tab comp
+    tab=$(printf '\t')
+
+    local longest=0
+    # Look for the longest completion so that we can format things nicely
+    while IFS='' read -r comp; do
+        # Strip any description before checking the length
+        comp=${comp%%%%$tab*}
+        # Only consider the completions that match
+        comp=$(compgen -W "$comp" -- "$cur")
+        if ((${#comp}>longest)); then
+            longest=${#comp}
+        fi
+    done < <(printf "%%s\n" "${out[@]}")
+
+    local completions=()
+    while IFS='' read -r comp; do
+        if [ -z "$comp" ]; then
+            continue
+        fi
+
+        __%[1]s_debug "Original comp: $comp"
+        comp="$(__%[1]s_format_comp_descriptions "$comp" "$longest")"
+        __%[1]s_debug "Final comp: $comp"
+        completions+=("$comp")
+    done < <(printf "%%s\n" "${out[@]}")
+
+    while IFS='' read -r comp; do
+        COMPREPLY+=("$comp")
+    done < <(compgen -W "${completions[*]}" -- "$cur")
+
+    # If there is a single completion left, remove the description text
+    if [ ${#COMPREPLY[*]} -eq 1 ]; then
+        __%[1]s_debug "COMPREPLY[0]: ${COMPREPLY[0]}"
+        comp="${COMPREPLY[0]%%%% *}"
+        __%[1]s_debug "Removed description from single completion, which is now: ${comp}"
+        COMPREPLY=()
+        COMPREPLY+=("$comp")
+    fi
+}
+
+__%[1]s_handle_special_char()
+{
+    local comp="$1"
+    local char=$2
+    if [[ "$comp" == *${char}* && "$COMP_WORDBREAKS" == *${char}* ]]; then
+        local word=${comp%%"${comp##*${char}}"}
+        local idx=${#COMPREPLY[*]}
+        while [[ $((--idx)) -ge 0 ]]; do
+            COMPREPLY[$idx]=${COMPREPLY[$idx]#"$word"}
+        done
+    fi
+}
+
+__%[1]s_format_comp_descriptions()
+{
+    local tab
+    tab=$(printf '\t')
+    local comp="$1"
+    local longest=$2
+
+    # Properly format the description string which follows a tab character if there is one
+    if [[ "$comp" == *$tab* ]]; then
+        desc=${comp#*$tab}
+        comp=${comp%%%%$tab*}
+
+        # $COLUMNS stores the current shell width.
+        # Remove an extra 4 because we add 2 spaces and 2 parentheses.
+        maxdesclength=$(( COLUMNS - longest - 4 ))
+
+        # Make sure we can fit a description of at least 8 characters
+        # if we are to align the descriptions.
+        if [[ $maxdesclength -gt 8 ]]; then
+            # Add the proper number of spaces to align the descriptions
+            for ((i = ${#comp} ; i < longest ; i++)); do
+                comp+=" "
+            done
+        else
+            # Don't pad the descriptions so we can fit more text after the completion
+            maxdesclength=$(( COLUMNS - ${#comp} - 4 ))
+        fi
+
+        # If there is enough space for any description text,
+        # truncate the descriptions that are too long for the shell width
+        if [ $maxdesclength -gt 0 ]; then
+            if [ ${#desc} -gt $maxdesclength ]; then
+                desc=${desc:0:$(( maxdesclength - 1 ))}
+                desc+="…"
+            fi
+            comp+="  ($desc)"
+        fi
+    fi
+
+    # Must use printf to escape all special characters
+    printf "%%q" "${comp}"
+}
+
+__start_%[1]s()
+{
+    local cur prev words cword split
+
+    COMPREPLY=()
+
+    # Call _init_completion from the bash-completion package
+    # to prepare the arguments properly
+    if declare -F _init_completion >/dev/null 2>&1; then
+        _init_completion -n "=:" || return
+    else
+        __%[1]s_init_completion -n "=:" || return
+    fi
+
+    __%[1]s_debug
+    __%[1]s_debug "========= starting completion logic =========="
+    __%[1]s_debug "cur is ${cur}, words[*] is ${words[*]}, #words[@] is ${#words[@]}, cword is $cword"
+
+    # The user could have moved the cursor backwards on the command-line.
+    # We need to trigger completion from the $cword location, so we need
+    # to truncate the command-line ($words) up to the $cword location.
+    words=("${words[@]:0:$cword+1}")
+    __%[1]s_debug "Truncated words[*]: ${words[*]},"
+
+    local out directive
+    __%[1]s_get_completion_results
+    __%[1]s_process_completion_results
+}
+
+if [[ $(type -t compopt) = "builtin" ]]; then
+    complete -o default -F __start_%[1]s %[1]s
+else
+    complete -o default -o nospace -F __start_%[1]s %[1]s
+fi
+
+# ex: ts=4 sw=4 et filetype=sh
+`, name, compCmd,
+		ShellCompDirectiveError, ShellCompDirectiveNoSpace, ShellCompDirectiveNoFileComp,
+		ShellCompDirectiveFilterFileExt, ShellCompDirectiveFilterDirs))
+}
+
+// GenBashCompletionFileV2 generates Bash completion version 2.
+func (c *Command) GenBashCompletionFileV2(filename string, includeDesc bool) error {
+	outFile, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+	defer outFile.Close()
+
+	return c.GenBashCompletionV2(outFile, includeDesc)
+}
+
+// GenBashCompletionV2 generates Bash completion file version 2
+// and writes it to the passed writer.
+func (c *Command) GenBashCompletionV2(w io.Writer, includeDesc bool) error {
+	return c.genBashCompletion(w, includeDesc)
+}
diff --git a/cobra/cmd/root.go b/cobra/cmd/root.go
index f27ae7e..350df10 100644
--- a/cobra/cmd/root.go
+++ b/cobra/cmd/root.go
@@ -15,8 +15,8 @@ package cmd
 
 import (
 	"fmt"
+	"os"
 
-	homedir "github.com/mitchellh/go-homedir"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 )
@@ -62,11 +62,12 @@ func initConfig() {
 		viper.SetConfigFile(cfgFile)
 	} else {
 		// Find home directory.
-		home, err := homedir.Dir()
+		home, err := os.UserHomeDir()
 		cobra.CheckErr(err)
 
 		// Search config in home directory with name ".cobra" (without extension).
 		viper.AddConfigPath(home)
+		viper.SetConfigType("yaml")
 		viper.SetConfigName(".cobra")
 	}
 
diff --git a/cobra/tpl/main.go b/cobra/tpl/main.go
index 0b9c661..ed3a98e 100644
--- a/cobra/tpl/main.go
+++ b/cobra/tpl/main.go
@@ -27,7 +27,6 @@ import (
 	"os"
 	"github.com/spf13/cobra"
 {{ if .Viper }}
-	homedir "github.com/mitchellh/go-homedir"
 	"github.com/spf13/viper"{{ end }}
 )
 
@@ -81,11 +80,12 @@ func initConfig() {
 		viper.SetConfigFile(cfgFile)
 	} else {
 		// Find home directory.
-		home, err := homedir.Dir()
+		home, err := os.UserHomeDir()
 		cobra.CheckErr(err)
 
 		// Search config in home directory with name ".{{ .AppName }}" (without extension).
 		viper.AddConfigPath(home)
+		viper.SetConfigType("yaml")
 		viper.SetConfigName(".{{ .AppName }}")
 	}
 
diff --git a/command.go b/command.go
index 5c85c89..2cc1889 100644
--- a/command.go
+++ b/command.go
@@ -63,9 +63,9 @@ type Command struct {
 	// 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 is list of all valid non-flag arguments that are accepted in shell completions
 	ValidArgs []string
-	// ValidArgsFunction is an optional function that provides valid non-flag arguments for bash completion.
+	// ValidArgsFunction is an optional function that provides valid non-flag arguments for shell completion.
 	// It is a dynamic version of using ValidArgs.
 	// Only one of ValidArgs and ValidArgsFunction can be used for a command.
 	ValidArgsFunction func(cmd *Command, args []string, toComplete string) ([]string, ShellCompDirective)
@@ -74,11 +74,12 @@ type Command struct {
 	Args PositionalArgs
 
 	// ArgAliases is List of aliases for ValidArgs.
-	// These are not suggested to the user in the bash completion,
+	// These are not suggested to the user in the shell completion,
 	// but accepted if entered manually.
 	ArgAliases []string
 
-	// BashCompletionFunction is custom functions used by the bash autocompletion generator.
+	// BashCompletionFunction is custom bash functions used by the legacy bash autocompletion generator.
+	// For portability with other shells, it is recommended to instead use ValidArgsFunction
 	BashCompletionFunction string
 
 	// Deprecated defines, if this command is deprecated and should print this string when used.
@@ -938,7 +939,7 @@ func (c *Command) ExecuteC() (cmd *Command, err error) {
 		args = os.Args[1:]
 	}
 
-	// initialize the hidden command to be used for bash completion
+	// initialize the hidden command to be used for shell completion
 	c.initCompleteCmd(args)
 
 	var flags []string
diff --git a/completions.go b/completions.go
index c647fad..b849b9c 100644
--- a/completions.go
+++ b/completions.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 	"strings"
+	"sync"
 
 	"github.com/spf13/pflag"
 )
@@ -17,13 +18,25 @@ const (
 	ShellCompNoDescRequestCmd = "__completeNoDesc"
 )
 
-// Global map of flag completion functions.
+// Global map of flag completion functions. Make sure to use flagCompletionMutex before you try to read and write from it.
 var flagCompletionFunctions = map[*pflag.Flag]func(cmd *Command, args []string, toComplete string) ([]string, ShellCompDirective){}
 
+// lock for reading and writing from flagCompletionFunctions
+var flagCompletionMutex = &sync.RWMutex{}
+
 // ShellCompDirective is a bit map representing the different behaviors the shell
 // can be instructed to have once completions have been provided.
 type ShellCompDirective int
 
+type flagCompError struct {
+	subCommand string
+	flagName   string
+}
+
+func (e *flagCompError) Error() string {
+	return "Subcommand '" + e.subCommand + "' does not support flag '" + e.flagName + "'"
+}
+
 const (
 	// ShellCompDirectiveError indicates an error occurred and completions should be ignored.
 	ShellCompDirectiveError ShellCompDirective = 1 << iota
@@ -34,7 +47,6 @@ const (
 
 	// ShellCompDirectiveNoFileComp indicates that the shell should not provide
 	// file completion even when no completion is provided.
-	// This currently does not work for zsh or bash < 4
 	ShellCompDirectiveNoFileComp
 
 	// ShellCompDirectiveFilterFileExt indicates that the provided completions
@@ -95,6 +107,9 @@ func (c *Command) RegisterFlagCompletionFunc(flagName string, f func(cmd *Comman
 	if flag == nil {
 		return fmt.Errorf("RegisterFlagCompletionFunc: flag '%s' does not exist", flagName)
 	}
+	flagCompletionMutex.Lock()
+	defer flagCompletionMutex.Unlock()
+
 	if _, exists := flagCompletionFunctions[flag]; exists {
 		return fmt.Errorf("RegisterFlagCompletionFunc: flag '%s' already registered", flagName)
 	}
@@ -223,18 +238,35 @@ func (c *Command) getCompletions(args []string) (*Command, []string, ShellCompDi
 	// This is important because if we are completing a flag value, we need to also
 	// remove the flag name argument from the list of finalArgs or else the parsing
 	// could fail due to an invalid value (incomplete) for the flag.
-	flag, finalArgs, toComplete, err := checkIfFlagCompletion(finalCmd, finalArgs, toComplete)
-	if err != nil {
-		// Error while attempting to parse flags
-		return finalCmd, []string{}, ShellCompDirectiveDefault, err
-	}
+	flag, finalArgs, toComplete, flagErr := checkIfFlagCompletion(finalCmd, finalArgs, toComplete)
+
+	// Check if interspersed is false or -- was set on a previous arg.
+	// This works by counting the arguments. Normally -- is not counted as arg but
+	// if -- was already set or interspersed is false and there is already one arg then
+	// the extra added -- is counted as arg.
+	flagCompletion := true
+	_ = finalCmd.ParseFlags(append(finalArgs, "--"))
+	newArgCount := finalCmd.Flags().NArg()
 
 	// Parse the flags early so we can check if required flags are set
 	if err = finalCmd.ParseFlags(finalArgs); err != nil {
 		return finalCmd, []string{}, ShellCompDirectiveDefault, fmt.Errorf("Error while parsing flags from args %v: %s", finalArgs, err.Error())
 	}
 
-	if flag != nil {
+	realArgCount := finalCmd.Flags().NArg()
+	if newArgCount > realArgCount {
+		// don't do flag completion (see above)
+		flagCompletion = false
+	}
+	// Error while attempting to parse flags
+	if flagErr != nil {
+		// If error type is flagCompError and we don't want flagCompletion we should ignore the error
+		if _, ok := flagErr.(*flagCompError); !(ok && !flagCompletion) {
+			return finalCmd, []string{}, ShellCompDirectiveDefault, flagErr
+		}
+	}
+
+	if flag != nil && flagCompletion {
 		// Check if we are completing a flag value subject to annotations
 		if validExts, present := flag.Annotations[BashCompFilenameExt]; present {
 			if len(validExts) != 0 {
@@ -261,7 +293,7 @@ func (c *Command) getCompletions(args []string) (*Command, []string, ShellCompDi
 	// When doing completion of a flag name, as soon as an argument starts with
 	// a '-' we know it is a flag.  We cannot use isFlagArg() here as it requires
 	// the flag name to be complete
-	if flag == nil && len(toComplete) > 0 && toComplete[0] == '-' && !strings.Contains(toComplete, "=") {
+	if flag == nil && len(toComplete) > 0 && toComplete[0] == '-' && !strings.Contains(toComplete, "=") && flagCompletion {
 		var completions []string
 
 		// First check for required flags
@@ -325,7 +357,7 @@ func (c *Command) getCompletions(args []string) (*Command, []string, ShellCompDi
 		if len(finalArgs) == 0 && !foundLocalNonPersistentFlag {
 			// We only complete sub-commands if:
 			// - there are no arguments on the command-line and
-			// - there are no local, non-peristent flag on the command-line or TraverseChildren is true
+			// - there are no local, non-persistent flags on the command-line or TraverseChildren is true
 			for _, subCmd := range finalCmd.Commands() {
 				if subCmd.IsAvailableCommand() || subCmd == finalCmd.helpCommand {
 					if strings.HasPrefix(subCmd.Name(), toComplete) {
@@ -374,8 +406,10 @@ func (c *Command) getCompletions(args []string) (*Command, []string, ShellCompDi
 
 	// Find the completion function for the flag or command
 	var completionFn func(cmd *Command, args []string, toComplete string) ([]string, ShellCompDirective)
-	if flag != nil {
+	if flag != nil && flagCompletion {
+		flagCompletionMutex.RLock()
 		completionFn = flagCompletionFunctions[flag]
+		flagCompletionMutex.RUnlock()
 	} else {
 		completionFn = finalCmd.ValidArgsFunction
 	}
@@ -458,6 +492,7 @@ func checkIfFlagCompletion(finalCmd *Command, args []string, lastArg string) (*p
 	var flagName string
 	trimmedArgs := args
 	flagWithEqual := false
+	orgLastArg := lastArg
 
 	// When doing completion of a flag name, as soon as an argument starts with
 	// a '-' we know it is a flag.  We cannot use isFlagArg() here as that function
@@ -516,9 +551,8 @@ func checkIfFlagCompletion(finalCmd *Command, args []string, lastArg string) (*p
 
 	flag := findFlag(finalCmd, flagName)
 	if flag == nil {
-		// Flag not supported by this command, nothing to complete
-		err := fmt.Errorf("Subcommand '%s' does not support flag '%s'", finalCmd.Name(), flagName)
-		return nil, nil, "", err
+		// Flag not supported by this command, the interspersed option might be set so return the original args
+		return nil, args, orgLastArg, &flagCompError{subCommand: finalCmd.Name(), flagName: flagName}
 	}
 
 	if !flagWithEqual {
@@ -592,9 +626,12 @@ You will need to start a new shell for this setup to take effect.
 		DisableFlagsInUseLine: true,
 		ValidArgsFunction:     NoFileCompletions,
 		RunE: func(cmd *Command, args []string) error {
-			return cmd.Root().GenBashCompletion(out)
+			return cmd.Root().GenBashCompletionV2(out, !noDesc)
 		},
 	}
+	if haveNoDescFlag {
+		bash.Flags().BoolVar(&noDesc, compCmdNoDescFlagName, compCmdNoDescFlagDefault, compCmdNoDescFlagDesc)
+	}
 
 	zsh := &Command{
 		Use:   "zsh",
@@ -608,7 +645,10 @@ to enable it.  You can execute the following once:
 $ echo "autoload -U compinit; compinit" >> ~/.zshrc
 
 To load completions for every new session, execute once:
+# Linux:
 $ %[1]s completion zsh > "${fpath[1]}/_%[1]s"
+# macOS:
+$ %[1]s completion zsh > /usr/local/share/zsh/site-functions/_%[1]s
 
 You will need to start a new shell for this setup to take effect.
 `, c.Root().Name()),
diff --git a/fish_completions.go b/fish_completions.go
index b0db323..bb57fd5 100644
--- a/fish_completions.go
+++ b/fish_completions.go
@@ -152,11 +152,11 @@ function __%[1]s_prepare_completions
             # We don't need descriptions anyway since there is only a single
             # real completion which the shell will expand immediately.
             set -l split (string split --max 1 \t $__%[1]s_comp_results[1])
-        
+
             # Fish won't add a space if the completion ends with any
             # of the following characters: @=/:.,
             set -l lastChar (string sub -s -1 -- $split)
-            if not string match -r -q "[@=/:.,]" -- "$lastChar"                
+            if not string match -r -q "[@=/:.,]" -- "$lastChar"
                 # In other cases, to support the "nospace" directive we trick the shell
                 # by outputting an extra, longer completion.
                 __%[1]s_debug "Adding second completion to perform nospace directive"
diff --git a/go.mod b/go.mod
index eb7d47f..1fb9439 100644
--- a/go.mod
+++ b/go.mod
@@ -5,8 +5,7 @@ go 1.14
 require (
 	github.com/cpuguy83/go-md2man/v2 v2.0.0
 	github.com/inconshreveable/mousetrap v1.0.0
-	github.com/mitchellh/go-homedir v1.1.0
 	github.com/spf13/pflag v1.0.5
-	github.com/spf13/viper v1.7.0
+	github.com/spf13/viper v1.8.1
 	gopkg.in/yaml.v2 v2.4.0
 )
diff --git a/go.sum b/go.sum
index 9328ee3..3e22df2 100644
--- a/go.sum
+++ b/go.sum
@@ -5,74 +5,141 @@ cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6A
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+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
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+google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
+google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
+google.golang.org/grpc v1.27.1/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
+google.golang.org/grpc v1.28.0/go.mod h1:rpkK4SK4GF4Ach/+MFLZUBavHOvF2JJB5uozKKal+60=
+google.golang.org/grpc v1.29.1/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3IjizoKk=
+google.golang.org/grpc v1.30.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
+google.golang.org/grpc v1.31.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
+google.golang.org/grpc v1.31.1/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
+google.golang.org/grpc v1.33.1/go.mod h1:fr5YgcSWrqhRRxogOsw7RzIpsmvOZ6IcH4kBYTpR3n0=
+google.golang.org/grpc v1.33.2/go.mod h1:JMHMWHQWaTccqQQlmk3MJZS+GWXOdAesneDmEnv2fbc=
+google.golang.org/grpc v1.34.0/go.mod h1:WotjhfgOW/POjDeRt8vscBtXq+2VjORFy659qA51WJ8=
+google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
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+google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
+google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
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+google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
+google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
+google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
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+google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
+google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/ini.v1 v1.51.0 h1:AQvPpx3LzTDM0AjnIRlVFwFFGC+npRopjZxLJj6gdno=
-gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
-gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
-gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
-gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/ini.v1 v1.62.0 h1:duBzk771uxoUuOlyRLkHsygud9+5lrlGjdFBb4mSKDU=
+gopkg.in/ini.v1 v1.62.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
diff --git a/powershell_completions.go b/powershell_completions.go
index 6a3f50f..59234c0 100644
--- a/powershell_completions.go
+++ b/powershell_completions.go
@@ -152,7 +152,7 @@ Register-ArgumentCompleter -CommandName '%[1]s' -ScriptBlock {
         # filter the result
         $_.Name -like "$WordToComplete*"
 
-        # Join the flag back if we have a equal sign flag
+        # Join the flag back if we have an equal sign flag
         if ( $IsEqualFlag ) {
             __%[1]s_debug "Join the equal sign flag back to the completion value"
             $_.Name = $Flag + "=" + $_.Name
@@ -178,7 +178,7 @@ Register-ArgumentCompleter -CommandName '%[1]s' -ScriptBlock {
 
     $Values | ForEach-Object {
 
-        # store temporay because switch will overwrite $_
+        # store temporary because switch will overwrite $_
         $comp = $_
 
         # PowerShell supports three different completion modes
diff --git a/projects_using_cobra.md b/projects_using_cobra.md
index d98a71e..62bdbff 100644
--- a/projects_using_cobra.md
+++ b/projects_using_cobra.md
@@ -21,6 +21,7 @@
 - [Kubernetes](http://kubernetes.io/)
 - [Linkerd](https://linkerd.io/)
 - [Mattermost-server](https://github.com/mattermost/mattermost-server)
+- [Meroxa CLI](https://github.com/meroxa/cli)
 - [Metal Stack CLI](https://github.com/metal-stack/metalctl)
 - [Moby (former Docker)](https://github.com/moby/moby)
 - [Nanobox](https://github.com/nanobox-io/nanobox)/[Nanopack](https://github.com/nanopack)
diff --git a/shell_completions.md b/shell_completions.md
index 0b51cff..4ba06a1 100644
--- a/shell_completions.md
+++ b/shell_completions.md
@@ -352,7 +352,10 @@ cmd.RegisterFlagCompletionFunc(flagName, func(cmd *cobra.Command, args []string,
 ```
 ### Descriptions for completions
 
-`zsh`, `fish` and `powershell` allow for descriptions to annotate completion choices.  For commands and flags, Cobra will provide the descriptions automatically, based on usage information.  For example, using zsh:
+Cobra provides support for completion descriptions.  Such descriptions are supported for each shell
+(however, for bash, it is only available in the [completion V2 version](#bash-completion-v2)).
+For commands and flags, Cobra will provide the descriptions automatically, based on usage information.
+For example, using zsh:
 ```
 $ helm s[tab]
 search  -- search for a keyword in charts
@@ -365,7 +368,7 @@ $ helm s[tab]
 search  (search for a keyword in charts)  show  (show information of a chart)  status  (displays the status of the named release)
 ```
 
-Cobra allows you to add annotations to your own completions.  Simply add the annotation text after each completion, following a `\t` separator.  This technique applies to completions returned by `ValidArgs`, `ValidArgsFunction` and `RegisterFlagCompletionFunc()`.  For example:
+Cobra allows you to add descriptions to your own completions.  Simply add the description text after each completion, following a `\t` separator.  This technique applies to completions returned by `ValidArgs`, `ValidArgsFunction` and `RegisterFlagCompletionFunc()`.  For example:
 ```go
 ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
 	return []string{"harbor\tAn image registry", "thanos\tLong-term metrics"}, cobra.ShellCompDirectiveNoFileComp
@@ -400,6 +403,37 @@ completion     firstcommand   secondcommand
 For backward compatibility, Cobra still supports its bash legacy dynamic completion solution.
 Please refer to [Bash Completions](bash_completions.md) for details.
 
+### Bash completion V2
+
+Cobra provides two versions for bash completion.  The original bash completion (which started it all!) can be used by calling
+`GenBashCompletion()` or `GenBashCompletionFile()`.
+
+A new V2 bash completion version is also available.  This version can be used by calling `GenBashCompletionV2()` or
+`GenBashCompletionFileV2()`.  The V2 version does **not** support the legacy dynamic completion
+(see [Bash Completions](bash_completions.md)) but instead works only with the Go dynamic completion
+solution described in this document.
+Unless your program already uses the legacy dynamic completion solution, it is recommended that you use the bash
+completion V2 solution which provides the following extra features:
+- Supports completion descriptions (like the other shells)
+- Small completion script of less than 300 lines (v1 generates scripts of thousands of lines; `kubectl` for example has a bash v1 completion script of over 13K lines)
+- Streamlined user experience thanks to a completion behavior aligned with the other shells 
+
+`Bash` completion V2 supports descriptions for completions. When calling `GenBashCompletionV2()` or `GenBashCompletionFileV2()`
+you must provide these functions with a parameter indicating if the completions should be annotated with a description; Cobra
+will provide the description automatically based on usage information.  You can choose to make this option configurable by
+your users.
+
+```
+# With descriptions
+$ helm s[tab][tab]
+search  (search for a keyword in charts)           status  (display the status of the named release)
+show    (show information of a chart)
+
+# Without descriptions
+$ helm s[tab][tab]
+search  show  status
+```
+**Note**: Cobra's default `completion` command uses bash completion V2.  If for some reason you need to use bash completion V1, you will need to implement your own `completion` command. 
 ## Zsh completions
 
 Cobra supports native zsh completion generated from the root `cobra.Command`.
diff --git a/user_guide.md b/user_guide.md
new file mode 100644
index 0000000..311abce
--- /dev/null
+++ b/user_guide.md
@@ -0,0 +1,637 @@
+# User Guide
+
+While you are welcome to provide your own organization, typically a Cobra-based
+application will follow the following organizational structure:
+
+```
+  ▾ appName/
+    ▾ cmd/
+        add.go
+        your.go
+        commands.go
+        here.go
+      main.go
+```
+
+In a Cobra app, typically the main.go file is very bare. It serves one purpose: initializing Cobra.
+
+```go
+package main
+
+import (
+  "{pathToYourApp}/cmd"
+)
+
+func main() {
+  cmd.Execute()
+}
+```
+
+## Using the 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.
+
+[Here](https://github.com/spf13/cobra/blob/master/cobra/README.md) you can find more information about it.
+
+## Using the Cobra Library
+
+To manually implement Cobra you need to create a bare main.go file and a rootCmd file.
+You will optionally provide additional commands as you see fit.
+
+### Create rootCmd
+
+Cobra doesn't require any special constructors. Simply create your commands.
+
+Ideally you place this in app/cmd/root.go:
+
+```go
+var rootCmd = &cobra.Command{
+  Use:   "hugo",
+  Short: "Hugo is a very fast static site generator",
+  Long: `A Fast and Flexible Static Site Generator built with
+                love by spf13 and friends in Go.
+                Complete documentation is available at http://hugo.spf13.com`,
+  Run: func(cmd *cobra.Command, args []string) {
+    // Do Stuff Here
+  },
+}
+
+func Execute() {
+  if err := rootCmd.Execute(); err != nil {
+    fmt.Fprintln(os.Stderr, err)
+    os.Exit(1)
+  }
+}
+```
+
+You will additionally define flags and handle configuration in your init() function.
+
+For example cmd/root.go:
+
+```go
+package cmd
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+var (
+	// Used for flags.
+	cfgFile     string
+	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() error {
+	return 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 := os.UserHomeDir()
+		cobra.CheckErr(err)
+
+		// Search config in home directory with name ".cobra" (without extension).
+		viper.AddConfigPath(home)
+		viper.SetConfigType("yaml")
+		viper.SetConfigName(".cobra")
+	}
+
+	viper.AutomaticEnv()
+
+	if err := viper.ReadInConfig(); err == nil {
+		fmt.Println("Using config file:", viper.ConfigFileUsed())
+	}
+}
+```
+
+### Create your main.go
+
+With the root command you need to have your main function execute it.
+Execute should be run on the root for clarity, though it can be called on any command.
+
+In a Cobra app, typically the main.go file is very bare. It serves one purpose: to initialize Cobra.
+
+```go
+package main
+
+import (
+  "{pathToYourApp}/cmd"
+)
+
+func main() {
+  cmd.Execute()
+}
+```
+
+### Create additional commands
+
+Additional commands can be defined and typically are each given their own file
+inside of the cmd/ directory.
+
+If you wanted to create a version command you would create cmd/version.go and
+populate it with the following:
+
+```go
+package cmd
+
+import (
+  "fmt"
+
+  "github.com/spf13/cobra"
+)
+
+func init() {
+  rootCmd.AddCommand(versionCmd)
+}
+
+var versionCmd = &cobra.Command{
+  Use:   "version",
+  Short: "Print the version number of Hugo",
+  Long:  `All software has versions. This is Hugo's`,
+  Run: func(cmd *cobra.Command, args []string) {
+    fmt.Println("Hugo Static Site Generator v0.9 -- HEAD")
+  },
+}
+```
+
+### Returning and handling errors
+
+If you wish to return an error to the caller of a command, `RunE` can be used.
+
+```go
+package cmd
+
+import (
+  "fmt"
+
+  "github.com/spf13/cobra"
+)
+
+func init() {
+  rootCmd.AddCommand(tryCmd)
+}
+
+var tryCmd = &cobra.Command{
+  Use:   "try",
+  Short: "Try and possibly fail at something",
+  RunE: func(cmd *cobra.Command, args []string) error {
+    if err := someFunc(); err != nil {
+	return err
+    }
+    return nil
+  },
+}
+```
+
+The error can then be caught at the execute function call.
+
+## Working with Flags
+
+Flags provide modifiers to control how the action command operates.
+
+### Assign flags to a command
+
+Since the flags are defined and used in different locations, we need to
+define a variable outside with the correct scope to assign the flag to
+work with.
+
+```go
+var Verbose bool
+var Source string
+```
+
+There are two different approaches to assign a flag.
+
+### Persistent Flags
+
+A flag can be 'persistent', meaning that this flag will be available to the
+command it's assigned to as well as every command under that command. For
+global flags, assign a flag as a persistent flag on the root.
+
+```go
+rootCmd.PersistentFlags().BoolVarP(&Verbose, "verbose", "v", false, "verbose output")
+```
+
+### Local Flags
+
+A flag can also be assigned locally, which will only apply to that specific command.
+
+```go
+localCmd.Flags().StringVarP(&Source, "source", "s", "", "Source directory to read from")
+```
+
+### Local Flag on Parent Commands
+
+By default, Cobra only parses local flags on the target command, and any local flags on
+parent commands are ignored. By enabling `Command.TraverseChildren`, Cobra will
+parse local flags on each command before executing the target command.
+
+```go
+command := cobra.Command{
+  Use: "print [OPTIONS] [COMMANDS]",
+  TraverseChildren: true,
+}
+```
+
+### Bind Flags with Config
+
+You can also bind your flags with [viper](https://github.com/spf13/viper):
+```go
+var author string
+
+func init() {
+  rootCmd.PersistentFlags().StringVar(&author, "author", "YOUR NAME", "Author name for copyright attribution")
+  viper.BindPFlag("author", rootCmd.PersistentFlags().Lookup("author"))
+}
+```
+
+In this example, the persistent flag `author` is bound with `viper`.
+**Note**: the variable `author` will not be set to the value from config,
+when the `--author` flag is not provided by user.
+
+More in [viper documentation](https://github.com/spf13/viper#working-with-flags).
+
+### Required flags
+
+Flags are optional by default. If instead you wish your command to report an error
+when a flag has not been set, mark it as required:
+```go
+rootCmd.Flags().StringVarP(&Region, "region", "r", "", "AWS region (required)")
+rootCmd.MarkFlagRequired("region")
+```
+
+Or, for persistent flags:
+```go
+rootCmd.PersistentFlags().StringVarP(&Region, "region", "r", "", "AWS region (required)")
+rootCmd.MarkPersistentFlagRequired("region")
+```
+
+## Positional and Custom Arguments
+
+Validation of positional arguments can be specified using the `Args` field
+of `Command`.
+
+The following validators are built in:
+
+- `NoArgs` - the command will report an error if there are any positional args.
+- `ArbitraryArgs` - the command will accept any args.
+- `OnlyValidArgs` - the command will report an error if there are any positional args that are not in the `ValidArgs` field of `Command`.
+- `MinimumNArgs(int)` - the command will report an error if there are not at least N positional args.
+- `MaximumNArgs(int)` - the command will report an error if there are more than N positional args.
+- `ExactArgs(int)` - the command will report an error if there are not exactly N positional args.
+- `ExactValidArgs(int)` - the command will report an error if there are not exactly N positional args OR if there are any positional args that are not in the `ValidArgs` field of `Command`
+- `RangeArgs(min, max)` - the command will report an error if the number of args is not between the minimum and maximum number of expected args.
+
+An example of setting the custom validator:
+
+```go
+var cmd = &cobra.Command{
+  Short: "hello",
+  Args: func(cmd *cobra.Command, args []string) error {
+    if len(args) < 1 {
+      return errors.New("requires a color argument")
+    }
+    if myapp.IsValidColor(args[0]) {
+      return nil
+    }
+    return fmt.Errorf("invalid color specified: %s", args[0])
+  },
+  Run: func(cmd *cobra.Command, args []string) {
+    fmt.Println("Hello, World!")
+  },
+}
+```
+
+## Example
+
+In the example below, we have defined three commands. Two are at the top level
+and one (cmdTimes) is a child of one of the top commands. In this case the root
+is not executable, meaning that a subcommand is required. This is accomplished
+by not providing a 'Run' for the 'rootCmd'.
+
+We have only defined one flag for a single command.
+
+More documentation about flags is available at https://github.com/spf13/pflag
+
+```go
+package main
+
+import (
+  "fmt"
+  "strings"
+
+  "github.com/spf13/cobra"
+)
+
+func main() {
+  var echoTimes int
+
+  var cmdPrint = &cobra.Command{
+    Use:   "print [string to print]",
+    Short: "Print anything to the screen",
+    Long: `print is for printing anything back to the screen.
+For many years people have printed back to the screen.`,
+    Args: cobra.MinimumNArgs(1),
+    Run: func(cmd *cobra.Command, args []string) {
+      fmt.Println("Print: " + strings.Join(args, " "))
+    },
+  }
+
+  var cmdEcho = &cobra.Command{
+    Use:   "echo [string to echo]",
+    Short: "Echo anything to the screen",
+    Long: `echo is for echoing anything back.
+Echo works a lot like print, except it has a child command.`,
+    Args: cobra.MinimumNArgs(1),
+    Run: func(cmd *cobra.Command, args []string) {
+      fmt.Println("Echo: " + strings.Join(args, " "))
+    },
+  }
+
+  var cmdTimes = &cobra.Command{
+    Use:   "times [string to echo]",
+    Short: "Echo anything to the screen more times",
+    Long: `echo things multiple times back to the user by providing
+a count and a string.`,
+    Args: cobra.MinimumNArgs(1),
+    Run: func(cmd *cobra.Command, args []string) {
+      for i := 0; i < echoTimes; i++ {
+        fmt.Println("Echo: " + strings.Join(args, " "))
+      }
+    },
+  }
+
+  cmdTimes.Flags().IntVarP(&echoTimes, "times", "t", 1, "times to echo the input")
+
+  var rootCmd = &cobra.Command{Use: "app"}
+  rootCmd.AddCommand(cmdPrint, cmdEcho)
+  cmdEcho.AddCommand(cmdTimes)
+  rootCmd.Execute()
+}
+```
+
+For a more complete example of a larger application, please checkout [Hugo](http://gohugo.io/).
+
+## Help Command
+
+Cobra automatically adds a help command to your application when you have subcommands.
+This will be called when a user runs 'app help'. Additionally, help will also
+support all other commands as input. Say, for instance, you have a command called
+'create' without any additional configuration; Cobra will work when 'app help
+create' is called.  Every command will automatically have the '--help' flag added.
+
+### Example
+
+The following output is automatically generated by Cobra. Nothing beyond the
+command and flag definitions are needed.
+
+    $ cobra help
+
+    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.
+
+    Usage:
+      cobra [command]
+
+    Available Commands:
+      add         Add a command to a Cobra Application
+      help        Help about any command
+      init        Initialize a Cobra Application
+
+    Flags:
+      -a, --author string    author name for copyright attribution (default "YOUR NAME")
+          --config string    config file (default is $HOME/.cobra.yaml)
+      -h, --help             help for cobra
+      -l, --license string   name of license for the project
+          --viper            use Viper for configuration (default true)
+
+    Use "cobra [command] --help" for more information about a command.
+
+
+Help is just a command like any other. There is no special logic or behavior
+around it. In fact, you can provide your own if you want.
+
+### Defining your own help
+
+You can provide your own Help command or your own template for the default command to use
+with following functions:
+
+```go
+cmd.SetHelpCommand(cmd *Command)
+cmd.SetHelpFunc(f func(*Command, []string))
+cmd.SetHelpTemplate(s string)
+```
+
+The latter two will also apply to any children commands.
+
+## Usage Message
+
+When the user provides an invalid flag or invalid command, Cobra responds by
+showing the user the 'usage'.
+
+### Example
+You may recognize this from the help above. That's because the default help
+embeds the usage as part of its output.
+
+    $ cobra --invalid
+    Error: unknown flag: --invalid
+    Usage:
+      cobra [command]
+
+    Available Commands:
+      add         Add a command to a Cobra Application
+      help        Help about any command
+      init        Initialize a Cobra Application
+
+    Flags:
+      -a, --author string    author name for copyright attribution (default "YOUR NAME")
+          --config string    config file (default is $HOME/.cobra.yaml)
+      -h, --help             help for cobra
+      -l, --license string   name of license for the project
+          --viper            use Viper for configuration (default true)
+
+    Use "cobra [command] --help" for more information about a command.
+
+### Defining your own usage
+You can provide your own usage function or template for Cobra to use.
+Like help, the function and template are overridable through public methods:
+
+```go
+cmd.SetUsageFunc(f func(*Command) error)
+cmd.SetUsageTemplate(s string)
+```
+
+## Version Flag
+
+Cobra adds a top-level '--version' flag if the Version field is set on the root command.
+Running an application with the '--version' flag will print the version to stdout using
+the version template. The template can be customized using the
+`cmd.SetVersionTemplate(s string)` function.
+
+## PreRun and PostRun Hooks
+
+It is possible to run functions before or after the main `Run` function of your command. The `PersistentPreRun` and `PreRun` functions will be executed before `Run`. `PersistentPostRun` and `PostRun` will be executed after `Run`.  The `Persistent*Run` functions will be inherited by children if they do not declare their own.  These functions are run in the following order:
+
+- `PersistentPreRun`
+- `PreRun`
+- `Run`
+- `PostRun`
+- `PersistentPostRun`
+
+An example of two commands which use all of these features is below.  When the subcommand is executed, it will run the root command's `PersistentPreRun` but not the root command's `PersistentPostRun`:
+
+```go
+package main
+
+import (
+  "fmt"
+
+  "github.com/spf13/cobra"
+)
+
+func main() {
+
+  var rootCmd = &cobra.Command{
+    Use:   "root [sub]",
+    Short: "My root command",
+    PersistentPreRun: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside rootCmd PersistentPreRun with args: %v\n", args)
+    },
+    PreRun: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside rootCmd PreRun with args: %v\n", args)
+    },
+    Run: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside rootCmd Run with args: %v\n", args)
+    },
+    PostRun: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside rootCmd PostRun with args: %v\n", args)
+    },
+    PersistentPostRun: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside rootCmd PersistentPostRun with args: %v\n", args)
+    },
+  }
+
+  var subCmd = &cobra.Command{
+    Use:   "sub [no options!]",
+    Short: "My subcommand",
+    PreRun: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside subCmd PreRun with args: %v\n", args)
+    },
+    Run: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside subCmd Run with args: %v\n", args)
+    },
+    PostRun: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside subCmd PostRun with args: %v\n", args)
+    },
+    PersistentPostRun: func(cmd *cobra.Command, args []string) {
+      fmt.Printf("Inside subCmd PersistentPostRun with args: %v\n", args)
+    },
+  }
+
+  rootCmd.AddCommand(subCmd)
+
+  rootCmd.SetArgs([]string{""})
+  rootCmd.Execute()
+  fmt.Println()
+  rootCmd.SetArgs([]string{"sub", "arg1", "arg2"})
+  rootCmd.Execute()
+}
+```
+
+Output:
+```
+Inside rootCmd PersistentPreRun with args: []
+Inside rootCmd PreRun with args: []
+Inside rootCmd Run with args: []
+Inside rootCmd PostRun with args: []
+Inside rootCmd PersistentPostRun with args: []
+
+Inside rootCmd PersistentPreRun with args: [arg1 arg2]
+Inside subCmd PreRun with args: [arg1 arg2]
+Inside subCmd Run with args: [arg1 arg2]
+Inside subCmd PostRun with args: [arg1 arg2]
+Inside subCmd PersistentPostRun with args: [arg1 arg2]
+```
+
+## Suggestions when "unknown command" happens
+
+Cobra will print automatic suggestions when "unknown command" errors happen. This allows Cobra to behave similarly to the `git` command when a typo happens. For example:
+
+```
+$ hugo srever
+Error: unknown command "srever" for "hugo"
+
+Did you mean this?
+        server
+
+Run 'hugo --help' for usage.
+```
+
+Suggestions are automatic based on every subcommand registered and use an implementation of [Levenshtein distance](http://en.wikipedia.org/wiki/Levenshtein_distance). Every registered command that matches a minimum distance of 2 (ignoring case) will be displayed as a suggestion.
+
+If you need to disable suggestions or tweak the string distance in your command, use:
+
+```go
+command.DisableSuggestions = true
+```
+
+or
+
+```go
+command.SuggestionsMinimumDistance = 1
+```
+
+You can also explicitly set names for which a given command will be suggested using the `SuggestFor` attribute. This allows suggestions for strings that are not close in terms of string distance, but makes sense in your set of commands and for some which you don't want aliases. Example:
+
+```
+$ kubectl remove
+Error: unknown command "remove" for "kubectl"
+
+Did you mean this?
+        delete
+
+Run 'kubectl help' for usage.
+```
+
+## Generating documentation for your command
+
+Cobra can generate documentation based on subcommands, flags, etc. Read more about it in the [docs generation documentation](doc/README.md).
+
+## Generating shell completions
+
+Cobra can generate a shell-completion file for the following shells: bash, zsh, fish, PowerShell. If you add more information to your commands, these completions can be amazingly powerful and flexible.  Read more about it in [Shell Completions](shell_completions.md).


Test patch:
diff --git a/cobra/cmd/init_test.go b/cobra/cmd/init_test.go
index 6d21ef7..e364f40 100644
--- a/cobra/cmd/init_test.go
+++ b/cobra/cmd/init_test.go
@@ -49,7 +49,7 @@ func TestGoldenInitCmd(t *testing.T) {
 			expectErr: true,
 		},
 		{
-			name:      "returns error when passing an relative path for project",
+			name:      "returns error when passing a relative path for project",
 			args:      []string{"github.com/spf13/testproject"},
 			pkgName:   "github.com/spf13/testproject",
 			expectErr: true,
diff --git a/cobra/cmd/testdata/root.go.golden b/cobra/cmd/testdata/root.go.golden
index be04036..32c1529 100644
--- a/cobra/cmd/testdata/root.go.golden
+++ b/cobra/cmd/testdata/root.go.golden
@@ -20,7 +20,6 @@ import (
 	"os"
 	"github.com/spf13/cobra"
 
-	homedir "github.com/mitchellh/go-homedir"
 	"github.com/spf13/viper"
 )
 
@@ -68,11 +67,12 @@ func initConfig() {
 		viper.SetConfigFile(cfgFile)
 	} else {
 		// Find home directory.
-		home, err := homedir.Dir()
+		home, err := os.UserHomeDir()
 		cobra.CheckErr(err)
 
 		// Search config in home directory with name ".testproject" (without extension).
 		viper.AddConfigPath(home)
+		viper.SetConfigType("yaml")
 		viper.SetConfigName(".testproject")
 	}
 
diff --git a/completions_test.go b/completions_test.go
index 9bd6a41..70c455a 100644
--- a/completions_test.go
+++ b/completions_test.go
@@ -1749,6 +1749,263 @@ func TestValidArgsFuncChildCmdsWithDesc(t *testing.T) {
 	}
 }
 
+func TestFlagCompletionWithNotInterspersedArgs(t *testing.T) {
+	rootCmd := &Command{Use: "root", Run: emptyRun}
+	childCmd := &Command{
+		Use: "child",
+		Run: emptyRun,
+		ValidArgsFunction: func(cmd *Command, args []string, toComplete string) ([]string, ShellCompDirective) {
+			return []string{"--validarg", "test"}, ShellCompDirectiveDefault
+		},
+	}
+	childCmd2 := &Command{
+		Use:       "child2",
+		Run:       emptyRun,
+		ValidArgs: []string{"arg1", "arg2"},
+	}
+	rootCmd.AddCommand(childCmd, childCmd2)
+	childCmd.Flags().Bool("bool", false, "test bool flag")
+	childCmd.Flags().String("string", "", "test string flag")
+	_ = childCmd.RegisterFlagCompletionFunc("string", func(cmd *Command, args []string, toComplete string) ([]string, ShellCompDirective) {
+		return []string{"myval"}, ShellCompDirectiveDefault
+	})
+
+	// Test flag completion with no argument
+	output, err := executeCommand(rootCmd, ShellCompRequestCmd, "child", "--")
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+
+	expected := strings.Join([]string{
+		"--bool\ttest bool flag",
+		"--string\ttest string flag",
+		":4",
+		"Completion ended with directive: ShellCompDirectiveNoFileComp", ""}, "\n")
+
+	if output != expected {
+		t.Errorf("expected: %q, got: %q", expected, output)
+	}
+
+	// Test that no flags are completed after the -- arg
+	output, err = executeCommand(rootCmd, ShellCompRequestCmd, "child", "--", "-")
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+
+	expected = strings.Join([]string{
+		"--validarg",
+		"test",
+		":0",
+		"Completion ended with directive: ShellCompDirectiveDefault", ""}, "\n")
+
+	if output != expected {
+		t.Errorf("expected: %q, got: %q", expected, output)
+	}
+
+	// Test that no flags are completed after the -- arg with a flag set
+	output, err = executeCommand(rootCmd, ShellCompRequestCmd, "child", "--bool", "--", "-")
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+
+	expected = strings.Join([]string{
+		"--validarg",
+		"test",
+		":0",
+		"Completion ended with directive: ShellCompDirectiveDefault", ""}, "\n")
+
+	if output != expected {
+		t.Errorf("expected: %q, got: %q", expected, output)
+	}
+
+	// set Interspersed to false which means that no flags should be completed after the first arg
+	childCmd.Flags().SetInterspersed(false)
+
+	// Test that no flags are completed after the first arg
+	output, err = executeCommand(rootCmd, ShellCompRequestCmd, "child", "arg", "--")
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+
+	expected = strings.Join([]string{
+		"--validarg",
+		"test",
+		":0",
+		"Completion ended with directive: ShellCompDirectiveDefault", ""}, "\n")
+
+	if output != expected {
+		t.Errorf("expected: %q, got: %q", expected, output)
+	}
+
+	// Test that no flags are completed after the fist arg with a flag set
+	output, err = executeCommand(rootCmd, ShellCompRequestCmd, "child", "--string", "t", "arg", "--")
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+
+	expected = strings.Join([]string{
+		"--validarg",
+		"test",
+		":0",
+		"Completion ended with directive: ShellCompDirectiveDefault", ""}, "\n")
+
+	if output != expected {
+		t.Errorf("expected: %q, got: %q", expected, output)
+	}
+
+	// Check that args are still completed after --
+	output, err = executeCommand(rootCmd, ShellCompRequestCmd, "child", "--", "")
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+
+	expected = strings.Join([]string{
+		"--validarg",
+		"test",
+		":0",
+		"Completion ended with directive: ShellCompDirectiveDefault", ""}, "\n")
+
+	if output != expected {
+		t.Errorf("expected: %q, got: %q", expected, output)
+	}
+
+	// Check that args are still completed even if flagname with ValidArgsFunction exists
+	output, err = executeCommand(rootCmd, ShellCompRequestCmd, "child", "--", "--string", "")
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+
+	expected = strings.Join([]string{
+		"--validarg",
+		"test",
+		":0",
+		"Completion ended with directive: ShellCompDirectiveDefault", ""}, "\n")
+
+	if output != expected {
+		t.Errorf("expected: %q, got: %q", expected, output)
+	}
+
+	// Check that args are still completed even if flagname with ValidArgsFunction exists
+	output, err = executeCommand(rootCmd, ShellCompRequestCmd, "child2", "--", "a")
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+
+	expected = strings.Join([]string{
+		"arg1",
+		"arg2",
+		":4",
+		"Completion ended with directive: ShellCompDirectiveNoFileComp", ""}, "\n")
+
+	if output != expected {
+		t.Errorf("expected: %q, got: %q", expected, output)
+	}
+
+	// Check that --validarg is not parsed as flag after --
+	output, err = executeCommand(rootCmd, ShellCompRequestCmd, "child", "--", "--validarg", "")
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+
+	expected = strings.Join([]string{
+		"--validarg",
+		"test",
+		":0",
+		"Completion ended with directive: ShellCompDirectiveDefault", ""}, "\n")
+
+	if output != expected {
+		t.Errorf("expected: %q, got: %q", expected, output)
+	}
+
+	// Check that --validarg is not parsed as flag after an arg
+	output, err = executeCommand(rootCmd, ShellCompRequestCmd, "child", "arg", "--validarg", "")
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+
+	expected = strings.Join([]string{
+		"--validarg",
+		"test",
+		":0",
+		"Completion ended with directive: ShellCompDirectiveDefault", ""}, "\n")
+
+	if output != expected {
+		t.Errorf("expected: %q, got: %q", expected, output)
+	}
+
+	// Check that --validarg is added to args for the ValidArgsFunction
+	childCmd.ValidArgsFunction = func(cmd *Command, args []string, toComplete string) ([]string, ShellCompDirective) {
+		return args, ShellCompDirectiveDefault
+	}
+	output, err = executeCommand(rootCmd, ShellCompRequestCmd, "child", "--", "--validarg", "")
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+
+	expected = strings.Join([]string{
+		"--validarg",
+		":0",
+		"Completion ended with directive: ShellCompDirectiveDefault", ""}, "\n")
+
+	if output != expected {
+		t.Errorf("expected: %q, got: %q", expected, output)
+	}
+
+	// Check that --validarg is added to args for the ValidArgsFunction and toComplete is also set correctly
+	childCmd.ValidArgsFunction = func(cmd *Command, args []string, toComplete string) ([]string, ShellCompDirective) {
+		return append(args, toComplete), ShellCompDirectiveDefault
+	}
+	output, err = executeCommand(rootCmd, ShellCompRequestCmd, "child", "--", "--validarg", "--toComp=ab")
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+
+	expected = strings.Join([]string{
+		"--validarg",
+		"--toComp=ab",
+		":0",
+		"Completion ended with directive: ShellCompDirectiveDefault", ""}, "\n")
+
+	if output != expected {
+		t.Errorf("expected: %q, got: %q", expected, output)
+	}
+}
+
+func TestFlagCompletionWorksRootCommandAddedAfterFlags(t *testing.T) {
+	rootCmd := &Command{Use: "root", Run: emptyRun}
+	childCmd := &Command{
+		Use: "child",
+		Run: emptyRun,
+		ValidArgsFunction: func(cmd *Command, args []string, toComplete string) ([]string, ShellCompDirective) {
+			return []string{"--validarg", "test"}, ShellCompDirectiveDefault
+		},
+	}
+	childCmd.Flags().Bool("bool", false, "test bool flag")
+	childCmd.Flags().String("string", "", "test string flag")
+	_ = childCmd.RegisterFlagCompletionFunc("string", func(cmd *Command, args []string, toComplete string) ([]string, ShellCompDirective) {
+		return []string{"myval"}, ShellCompDirectiveDefault
+	})
+
+	// Important: This is a test for https://github.com/spf13/cobra/issues/1437
+	// Only add the subcommand after RegisterFlagCompletionFunc was called, do not change this order!
+	rootCmd.AddCommand(childCmd)
+
+	// Test that flag completion works for the subcmd
+	output, err := executeCommand(rootCmd, ShellCompRequestCmd, "child", "--string", "")
+	if err != nil {
+		t.Errorf("Unexpected error: %v", err)
+	}
+
+	expected := strings.Join([]string{
+		"myval",
+		":0",
+		"Completion ended with directive: ShellCompDirectiveDefault", ""}, "\n")
+
+	if output != expected {
+		t.Errorf("expected: %q, got: %q", expected, output)
+	}
+}
+
 func TestFlagCompletionInGoWithDesc(t *testing.T) {
 	rootCmd := &Command{
 		Use: "root",
@@ -2097,9 +2354,9 @@ func TestDefaultCompletionCmd(t *testing.T) {
 	removeCompCmd(rootCmd)
 
 	var compCmd *Command
-	// Test that the --no-descriptions flag is present for the relevant shells only
+	// Test that the --no-descriptions flag is present on all shells
 	assertNoErr(t, rootCmd.Execute())
-	for _, shell := range []string{"fish", "powershell", "zsh"} {
+	for _, shell := range []string{"bash", "fish", "powershell", "zsh"} {
 		if compCmd, _, err = rootCmd.Find([]string{compCmdName, shell}); err != nil {
 			t.Errorf("Unexpected error: %v", err)
 		}
@@ -2107,14 +2364,6 @@ func TestDefaultCompletionCmd(t *testing.T) {
 			t.Errorf("Missing --%s flag for %s shell", compCmdNoDescFlagName, shell)
 		}
 	}
-	for _, shell := range []string{"bash"} {
-		if compCmd, _, err = rootCmd.Find([]string{compCmdName, shell}); err != nil {
-			t.Errorf("Unexpected error: %v", err)
-		}
-		if flag := compCmd.Flags().Lookup(compCmdNoDescFlagName); flag != nil {
-			t.Errorf("Unexpected --%s flag for %s shell", compCmdNoDescFlagName, shell)
-		}
-	}
 	// Remove completion command for the next test
 	removeCompCmd(rootCmd)