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github.com/codegangsta/cli

package cli

v1.20.0
Latest Go to latest
Published: Aug 11, 2017 | License: MIT | Module: github.com/codegangsta/cli

Overview

Package cli provides a minimal framework for creating and organizing command line Go applications. cli is designed to be easy to understand and write, the most simple cli application can be written as follows:

func main() {
  cli.NewApp().Run(os.Args)
}

Of course this application does not do much, so let's make this an actual application:

func main() {
  app := cli.NewApp()
  app.Name = "greet"
  app.Usage = "say a greeting"
  app.Action = func(c *cli.Context) error {
    println("Greetings")
    return nil
  }

  app.Run(os.Args)
}

Index

Examples

Variables

var AppHelpTemplate = "" /* 971 byte string literal not displayed */

AppHelpTemplate is the text template for the Default help topic. cli.go uses text/template to render templates. You can render custom help text by setting this variable.

var CommandHelpTemplate = "" /* 404 byte string literal not displayed */

CommandHelpTemplate is the text template for the command help topic. cli.go uses text/template to render templates. You can render custom help text by setting this variable.

var ErrWriter io.Writer = os.Stderr

ErrWriter is used to write errors to the user. This can be anything implementing the io.Writer interface and defaults to os.Stderr.

var HelpPrinter helpPrinter = printHelp

HelpPrinter is a function that writes the help output. If not set a default is used. The function signature is: func(w io.Writer, templ string, data interface{})

var HelpPrinterCustom helpPrinterCustom = printHelpCustom

HelpPrinterCustom is same as HelpPrinter but takes a custom function for template function map.

var OsExiter = os.Exit

OsExiter is the function used when the app exits. If not set defaults to os.Exit.

var SubcommandHelpTemplate = "" /* 507 byte string literal not displayed */

SubcommandHelpTemplate is the text template for the subcommand help topic. cli.go uses text/template to render templates. You can render custom help text by setting this variable.

var VersionPrinter = printVersion

VersionPrinter prints the version for the App

func DefaultAppComplete

func DefaultAppComplete(c *Context)

DefaultAppComplete prints the list of subcommands as the default app completion method

func HandleAction

func HandleAction(action interface{}, context *Context) (err error)

HandleAction attempts to figure out which Action signature was used. If it's an ActionFunc or a func with the legacy signature for Action, the func is run!

func HandleExitCoder

func HandleExitCoder(err error)

HandleExitCoder checks if the error fulfills the ExitCoder interface, and if so prints the error to stderr (if it is non-empty) and calls OsExiter with the given exit code. If the given error is a MultiError, then this func is called on all members of the Errors slice and calls OsExiter with the last exit code.

func ShowAppHelp

func ShowAppHelp(c *Context) (err error)

ShowAppHelp is an action that displays the help.

func ShowAppHelpAndExit

func ShowAppHelpAndExit(c *Context, exitCode int)

ShowAppHelpAndExit - Prints the list of subcommands for the app and exits with exit code.

func ShowCommandCompletions

func ShowCommandCompletions(ctx *Context, command string)

ShowCommandCompletions prints the custom completions for a given command

func ShowCommandHelp

func ShowCommandHelp(ctx *Context, command string) error

ShowCommandHelp prints help for the given command

func ShowCommandHelpAndExit

func ShowCommandHelpAndExit(c *Context, command string, code int)

ShowCommandHelpAndExit - exits with code after showing help

func ShowCompletions

func ShowCompletions(c *Context)

ShowCompletions prints the lists of commands within a given context

func ShowSubcommandHelp

func ShowSubcommandHelp(c *Context) error

ShowSubcommandHelp prints help for the given subcommand

func ShowVersion

func ShowVersion(c *Context)

ShowVersion prints the version number of the App

type ActionFunc

type ActionFunc func(*Context) error

ActionFunc is the action to execute when no subcommands are specified

type AfterFunc

type AfterFunc func(*Context) error

AfterFunc is an action to execute after any subcommands are run, but after the subcommand has finished it is run even if Action() panics

type App

type App struct {
	// The name of the program. Defaults to path.Base(os.Args[0])
	Name string
	// Full name of command for help, defaults to Name
	HelpName string
	// Description of the program.
	Usage string
	// Text to override the USAGE section of help
	UsageText string
	// Description of the program argument format.
	ArgsUsage string
	// Version of the program
	Version string
	// Description of the program
	Description string
	// List of commands to execute
	Commands []Command
	// List of flags to parse
	Flags []Flag
	// Boolean to enable bash completion commands
	EnableBashCompletion bool
	// Boolean to hide built-in help command
	HideHelp bool
	// Boolean to hide built-in version flag and the VERSION section of help
	HideVersion bool

	// An action to execute when the bash-completion flag is set
	BashComplete BashCompleteFunc
	// An action to execute before any subcommands are run, but after the context is ready
	// If a non-nil error is returned, no subcommands are run
	Before BeforeFunc
	// An action to execute after any subcommands are run, but after the subcommand has finished
	// It is run even if Action() panics
	After AfterFunc

	// The action to execute when no subcommands are specified
	// Expects a `cli.ActionFunc` but will accept the *deprecated* signature of `func(*cli.Context) {}`
	// *Note*: support for the deprecated `Action` signature will be removed in a future version
	Action interface{}

	// Execute this function if the proper command cannot be found
	CommandNotFound CommandNotFoundFunc
	// Execute this function if an usage error occurs
	OnUsageError OnUsageErrorFunc
	// Compilation date
	Compiled time.Time
	// List of all authors who contributed
	Authors []Author
	// Copyright of the binary if any
	Copyright string
	// Name of Author (Note: Use App.Authors, this is deprecated)
	Author string
	// Email of Author (Note: Use App.Authors, this is deprecated)
	Email string
	// Writer writer to write output to
	Writer io.Writer
	// ErrWriter writes error output
	ErrWriter io.Writer
	// Other custom info
	Metadata map[string]interface{}
	// Carries a function which returns app specific info.
	ExtraInfo func() map[string]string
	// CustomAppHelpTemplate the text template for app help topic.
	// cli.go uses text/template to render templates. You can
	// render custom help text by setting this variable.
	CustomAppHelpTemplate string
	// contains filtered or unexported fields
}

App is the main structure of a cli application. It is recommended that an app be created with the cli.NewApp() function

func NewApp

func NewApp() *App

NewApp creates a new cli Application with some reasonable defaults for Name, Usage, Version and Action.

func (*App) Categories

func (a *App) Categories() CommandCategories

Categories returns a slice containing all the categories with the commands they contain

func (*App) Command

func (a *App) Command(name string) *Command

Command returns the named command on App. Returns nil if the command does not exist

func (*App) Run

func (a *App) Run(arguments []string) (err error)

Run is the entry point to the cli app. Parses the arguments slice and routes to the proper flag/args combination

Example

Code:

// set args for examples sake
os.Args = []string{"greet", "--name", "Jeremy"}

app := NewApp()
app.Name = "greet"
app.Flags = []Flag{
	StringFlag{Name: "name", Value: "bob", Usage: "a name to say"},
}
app.Action = func(c *Context) error {
	fmt.Printf("Hello %v\n", c.String("name"))
	return nil
}
app.UsageText = "app [first_arg] [second_arg]"
app.Author = "Harrison"
app.Email = "harrison@lolwut.com"
app.Authors = []Author{{Name: "Oliver Allen", Email: "oliver@toyshop.com"}}
app.Run(os.Args)

Output:

Hello Jeremy
Example (AppHelp)

Code:

// set args for examples sake
os.Args = []string{"greet", "help"}

app := NewApp()
app.Name = "greet"
app.Version = "0.1.0"
app.Description = "This is how we describe greet the app"
app.Authors = []Author{
	{Name: "Harrison", Email: "harrison@lolwut.com"},
	{Name: "Oliver Allen", Email: "oliver@toyshop.com"},
}
app.Flags = []Flag{
	StringFlag{Name: "name", Value: "bob", Usage: "a name to say"},
}
app.Commands = []Command{
	{
		Name:        "describeit",
		Aliases:     []string{"d"},
		Usage:       "use it to see a description",
		Description: "This is how we describe describeit the function",
		Action: func(c *Context) error {
			fmt.Printf("i like to describe things")
			return nil
		},
	},
}
app.Run(os.Args)

Output:

NAME:
   greet - A new cli application

USAGE:
   greet [global options] command [command options] [arguments...]

VERSION:
   0.1.0

DESCRIPTION:
   This is how we describe greet the app

AUTHORS:
   Harrison <harrison@lolwut.com>
   Oliver Allen <oliver@toyshop.com>

COMMANDS:
     describeit, d  use it to see a description
     help, h        Shows a list of commands or help for one command

GLOBAL OPTIONS:
   --name value   a name to say (default: "bob")
   --help, -h     show help
   --version, -v  print the version
Example (BashComplete)

Code:

// set args for examples sake
os.Args = []string{"greet", "--generate-bash-completion"}

app := NewApp()
app.Name = "greet"
app.EnableBashCompletion = true
app.Commands = []Command{
	{
		Name:        "describeit",
		Aliases:     []string{"d"},
		Usage:       "use it to see a description",
		Description: "This is how we describe describeit the function",
		Action: func(c *Context) error {
			fmt.Printf("i like to describe things")
			return nil
		},
	}, {
		Name:        "next",
		Usage:       "next example",
		Description: "more stuff to see when generating bash completion",
		Action: func(c *Context) error {
			fmt.Printf("the next example")
			return nil
		},
	},
}

app.Run(os.Args)

Output:

describeit
d
next
help
h
Example (CommandHelp)

Code:

// set args for examples sake
os.Args = []string{"greet", "h", "describeit"}

app := NewApp()
app.Name = "greet"
app.Flags = []Flag{
	StringFlag{Name: "name", Value: "bob", Usage: "a name to say"},
}
app.Commands = []Command{
	{
		Name:        "describeit",
		Aliases:     []string{"d"},
		Usage:       "use it to see a description",
		Description: "This is how we describe describeit the function",
		Action: func(c *Context) error {
			fmt.Printf("i like to describe things")
			return nil
		},
	},
}
app.Run(os.Args)

Output:

NAME:
   greet describeit - use it to see a description

USAGE:
   greet describeit [arguments...]

DESCRIPTION:
   This is how we describe describeit the function
Example (NoAction)

Code:

app := App{}
app.Name = "greet"
app.Run([]string{"greet"})

Output:

NAME:
   greet

USAGE:
    [global options] command [command options] [arguments...]

COMMANDS:
     help, h  Shows a list of commands or help for one command

GLOBAL OPTIONS:
   --help, -h     show help
   --version, -v  print the version
Example (Subcommand)

Code:

// set args for examples sake
os.Args = []string{"say", "hi", "english", "--name", "Jeremy"}
app := NewApp()
app.Name = "say"
app.Commands = []Command{
	{
		Name:        "hello",
		Aliases:     []string{"hi"},
		Usage:       "use it to see a description",
		Description: "This is how we describe hello the function",
		Subcommands: []Command{
			{
				Name:        "english",
				Aliases:     []string{"en"},
				Usage:       "sends a greeting in english",
				Description: "greets someone in english",
				Flags: []Flag{
					StringFlag{
						Name:  "name",
						Value: "Bob",
						Usage: "Name of the person to greet",
					},
				},
				Action: func(c *Context) error {
					fmt.Println("Hello,", c.String("name"))
					return nil
				},
			},
		},
	},
}

app.Run(os.Args)

Output:

Hello, Jeremy
Example (SubcommandNoAction)

Code:

app := App{}
app.Name = "greet"
app.Commands = []Command{
	{
		Name:        "describeit",
		Aliases:     []string{"d"},
		Usage:       "use it to see a description",
		Description: "This is how we describe describeit the function",
	},
}
app.Run([]string{"greet", "describeit"})

Output:

NAME:
    describeit - use it to see a description

USAGE:
    describeit [arguments...]

DESCRIPTION:
   This is how we describe describeit the function

func (*App) RunAndExitOnError

func (a *App) RunAndExitOnError()

RunAndExitOnError calls .Run() and exits non-zero if an error was returned

Deprecated: instead you should return an error that fulfills cli.ExitCoder to cli.App.Run. This will cause the application to exit with the given eror code in the cli.ExitCoder

func (*App) RunAsSubcommand

func (a *App) RunAsSubcommand(ctx *Context) (err error)

RunAsSubcommand invokes the subcommand given the context, parses ctx.Args() to generate command-specific flags

func (*App) Setup

func (a *App) Setup()

Setup runs initialization code to ensure all data structures are ready for `Run` or inspection prior to `Run`. It is internally called by `Run`, but will return early if setup has already happened.

func (*App) VisibleCategories

func (a *App) VisibleCategories() []*CommandCategory

VisibleCategories returns a slice of categories and commands that are Hidden=false

func (*App) VisibleCommands

func (a *App) VisibleCommands() []Command

VisibleCommands returns a slice of the Commands with Hidden=false

func (*App) VisibleFlags

func (a *App) VisibleFlags() []Flag

VisibleFlags returns a slice of the Flags with Hidden=false

type Args

type Args []string

Args contains apps console arguments

func (Args) First

func (a Args) First() string

First returns the first argument, or else a blank string

func (Args) Get

func (a Args) Get(n int) string

Get returns the nth argument, or else a blank string

func (Args) Present

func (a Args) Present() bool

Present checks if there are any arguments present

func (Args) Swap

func (a Args) Swap(from, to int) error

Swap swaps arguments at the given indexes

func (Args) Tail

func (a Args) Tail() []string

Tail returns the rest of the arguments (not the first one) or else an empty string slice

type Author

type Author struct {
	Name  string // The Authors name
	Email string // The Authors email
}

Author represents someone who has contributed to a cli project.

func (Author) String

func (a Author) String() string

String makes Author comply to the Stringer interface, to allow an easy print in the templating process

type BashCompleteFunc

type BashCompleteFunc func(*Context)

BashCompleteFunc is an action to execute when the bash-completion flag is set

type BeforeFunc

type BeforeFunc func(*Context) error

BeforeFunc is an action to execute before any subcommands are run, but after the context is ready if a non-nil error is returned, no subcommands are run

type BoolFlag

type BoolFlag struct {
	Name        string
	Usage       string
	EnvVar      string
	Hidden      bool
	Destination *bool
}

BoolFlag is a flag with type bool

func (BoolFlag) Apply

func (f BoolFlag) Apply(set *flag.FlagSet)

Apply populates the flag given the flag set and environment Ignores errors

func (BoolFlag) ApplyWithError

func (f BoolFlag) ApplyWithError(set *flag.FlagSet) error

ApplyWithError populates the flag given the flag set and environment

func (BoolFlag) GetName

func (f BoolFlag) GetName() string

GetName returns the name of the flag

func (BoolFlag) String

func (f BoolFlag) String() string

String returns a readable representation of this value (for usage defaults)

type BoolTFlag

type BoolTFlag struct {
	Name        string
	Usage       string
	EnvVar      string
	Hidden      bool
	Destination *bool
}

BoolTFlag is a flag with type bool that is true by default

func (BoolTFlag) Apply

func (f BoolTFlag) Apply(set *flag.FlagSet)

Apply populates the flag given the flag set and environment Ignores errors

func (BoolTFlag) ApplyWithError

func (f BoolTFlag) ApplyWithError(set *flag.FlagSet) error

ApplyWithError populates the flag given the flag set and environment

func (BoolTFlag) GetName

func (f BoolTFlag) GetName() string

GetName returns the name of the flag

func (BoolTFlag) String

func (f BoolTFlag) String() string

String returns a readable representation of this value (for usage defaults)

type Command

type Command struct {
	// The name of the command
	Name string
	// short name of the command. Typically one character (deprecated, use `Aliases`)
	ShortName string
	// A list of aliases for the command
	Aliases []string
	// A short description of the usage of this command
	Usage string
	// Custom text to show on USAGE section of help
	UsageText string
	// A longer explanation of how the command works
	Description string
	// A short description of the arguments of this command
	ArgsUsage string
	// The category the command is part of
	Category string
	// The function to call when checking for bash command completions
	BashComplete BashCompleteFunc
	// An action to execute before any sub-subcommands are run, but after the context is ready
	// If a non-nil error is returned, no sub-subcommands are run
	Before BeforeFunc
	// An action to execute after any subcommands are run, but after the subcommand has finished
	// It is run even if Action() panics
	After AfterFunc
	// The function to call when this command is invoked
	Action interface{}

	// Execute this function if a usage error occurs.
	OnUsageError OnUsageErrorFunc
	// List of child commands
	Subcommands Commands
	// List of flags to parse
	Flags []Flag
	// Treat all flags as normal arguments if true
	SkipFlagParsing bool
	// Skip argument reordering which attempts to move flags before arguments,
	// but only works if all flags appear after all arguments. This behavior was
	// removed n version 2 since it only works under specific conditions so we
	// backport here by exposing it as an option for compatibility.
	SkipArgReorder bool
	// Boolean to hide built-in help command
	HideHelp bool
	// Boolean to hide this command from help or completion
	Hidden bool

	// Full name of command for help, defaults to full command name, including parent commands.
	HelpName string

	// CustomHelpTemplate the text template for the command help topic.
	// cli.go uses text/template to render templates. You can
	// render custom help text by setting this variable.
	CustomHelpTemplate string
	// contains filtered or unexported fields
}

Command is a subcommand for a cli.App.

func (Command) FullName

func (c Command) FullName() string

FullName returns the full name of the command. For subcommands this ensures that parent commands are part of the command path

func (Command) HasName

func (c Command) HasName(name string) bool

HasName returns true if Command.Name or Command.ShortName matches given name

func (Command) Names

func (c Command) Names() []string

Names returns the names including short names and aliases.

func (Command) Run

func (c Command) Run(ctx *Context) (err error)

Run invokes the command given the context, parses ctx.Args() to generate command-specific flags

func (Command) VisibleFlags

func (c Command) VisibleFlags() []Flag

VisibleFlags returns a slice of the Flags with Hidden=false

type CommandCategories

type CommandCategories []*CommandCategory

CommandCategories is a slice of *CommandCategory.

func (CommandCategories) AddCommand

func (c CommandCategories) AddCommand(category string, command Command) CommandCategories

AddCommand adds a command to a category.

func (CommandCategories) Len

func (c CommandCategories) Len() int

func (CommandCategories) Less

func (c CommandCategories) Less(i, j int) bool

func (CommandCategories) Swap

func (c CommandCategories) Swap(i, j int)

type CommandCategory

type CommandCategory struct {
	Name     string
	Commands Commands
}

CommandCategory is a category containing commands.

func (*CommandCategory) VisibleCommands

func (c *CommandCategory) VisibleCommands() []Command

VisibleCommands returns a slice of the Commands with Hidden=false

type CommandNotFoundFunc

type CommandNotFoundFunc func(*Context, string)

CommandNotFoundFunc is executed if the proper command cannot be found

type Commands

type Commands []Command

Commands is a slice of Command

type CommandsByName

type CommandsByName []Command

func (CommandsByName) Len

func (c CommandsByName) Len() int

func (CommandsByName) Less

func (c CommandsByName) Less(i, j int) bool

func (CommandsByName) Swap

func (c CommandsByName) Swap(i, j int)

type Context

type Context struct {
	App     *App
	Command Command
	// contains filtered or unexported fields
}

Context is a type that is passed through to each Handler action in a cli application. Context can be used to retrieve context-specific Args and parsed command-line options.

func NewContext

func NewContext(app *App, set *flag.FlagSet, parentCtx *Context) *Context

NewContext creates a new context. For use in when invoking an App or Command action.

func (*Context) Args

func (c *Context) Args() Args

Args returns the command line arguments associated with the context.

func (*Context) Bool

func (c *Context) Bool(name string) bool

Bool looks up the value of a local BoolFlag, returns false if not found

func (*Context) BoolT

func (c *Context) BoolT(name string) bool

BoolT looks up the value of a local BoolTFlag, returns false if not found

func (*Context) Duration

func (c *Context) Duration(name string) time.Duration

Duration looks up the value of a local DurationFlag, returns 0 if not found

func (*Context) FlagNames

func (c *Context) FlagNames() (names []string)

FlagNames returns a slice of flag names used in this context.

func (*Context) Float64

func (c *Context) Float64(name string) float64

Float64 looks up the value of a local Float64Flag, returns 0 if not found

func (*Context) Generic

func (c *Context) Generic(name string) interface{}

Generic looks up the value of a local GenericFlag, returns nil if not found

func (*Context) GlobalBool

func (c *Context) GlobalBool(name string) bool

GlobalBool looks up the value of a global BoolFlag, returns false if not found

func (*Context) GlobalBoolT

func (c *Context) GlobalBoolT(name string) bool

GlobalBoolT looks up the value of a global BoolTFlag, returns false if not found

func (*Context) GlobalDuration

func (c *Context) GlobalDuration(name string) time.Duration

GlobalDuration looks up the value of a global DurationFlag, returns 0 if not found

func (*Context) GlobalFlagNames

func (c *Context) GlobalFlagNames() (names []string)

GlobalFlagNames returns a slice of global flag names used by the app.

func (*Context) GlobalFloat64

func (c *Context) GlobalFloat64(name string) float64

GlobalFloat64 looks up the value of a global Float64Flag, returns 0 if not found

func (*Context) GlobalGeneric

func (c *Context) GlobalGeneric(name string) interface{}

GlobalGeneric looks up the value of a global GenericFlag, returns nil if not found

func (*Context) GlobalInt

func (c *Context) GlobalInt(name string) int

GlobalInt looks up the value of a global IntFlag, returns 0 if not found

func (*Context) GlobalInt64

func (c *Context) GlobalInt64(name string) int64

GlobalInt64 looks up the value of a global Int64Flag, returns 0 if not found

func (*Context) GlobalInt64Slice

func (c *Context) GlobalInt64Slice(name string) []int64

GlobalInt64Slice looks up the value of a global Int64SliceFlag, returns nil if not found

func (*Context) GlobalIntSlice

func (c *Context) GlobalIntSlice(name string) []int

GlobalIntSlice looks up the value of a global IntSliceFlag, returns nil if not found

func (*Context) GlobalIsSet

func (c *Context) GlobalIsSet(name string) bool

GlobalIsSet determines if the global flag was actually set

func (*Context) GlobalSet

func (c *Context) GlobalSet(name, value string) error

GlobalSet sets a context flag to a value on the global flagset

func (*Context) GlobalString

func (c *Context) GlobalString(name string) string

GlobalString looks up the value of a global StringFlag, returns "" if not found

func (*Context) GlobalStringSlice

func (c *Context) GlobalStringSlice(name string) []string

GlobalStringSlice looks up the value of a global StringSliceFlag, returns nil if not found

func (*Context) GlobalUint

func (c *Context) GlobalUint(name string) uint

GlobalUint looks up the value of a global UintFlag, returns 0 if not found

func (*Context) GlobalUint64

func (c *Context) GlobalUint64(name string) uint64

GlobalUint64 looks up the value of a global Uint64Flag, returns 0 if not found

func (*Context) Int

func (c *Context) Int(name string) int

Int looks up the value of a local IntFlag, returns 0 if not found

func (*Context) Int64

func (c *Context) Int64(name string) int64

Int64 looks up the value of a local Int64Flag, returns 0 if not found

func (*Context) Int64Slice

func (c *Context) Int64Slice(name string) []int64

Int64Slice looks up the value of a local Int64SliceFlag, returns nil if not found

func (*Context) IntSlice

func (c *Context) IntSlice(name string) []int

IntSlice looks up the value of a local IntSliceFlag, returns nil if not found

func (*Context) IsSet

func (c *Context) IsSet(name string) bool

IsSet determines if the flag was actually set

func (*Context) NArg

func (c *Context) NArg() int

NArg returns the number of the command line arguments.

func (*Context) NumFlags

func (c *Context) NumFlags() int

NumFlags returns the number of flags set

func (*Context) Parent

func (c *Context) Parent() *Context

Parent returns the parent context, if any

func (*Context) Set

func (c *Context) Set(name, value string) error

Set sets a context flag to a value.

func (*Context) String

func (c *Context) String(name string) string

String looks up the value of a local StringFlag, returns "" if not found

func (*Context) StringSlice

func (c *Context) StringSlice(name string) []string

StringSlice looks up the value of a local StringSliceFlag, returns nil if not found

func (*Context) Uint

func (c *Context) Uint(name string) uint

Uint looks up the value of a local UintFlag, returns 0 if not found

func (*Context) Uint64

func (c *Context) Uint64(name string) uint64

Uint64 looks up the value of a local Uint64Flag, returns 0 if not found

type DurationFlag

type DurationFlag struct {
	Name        string
	Usage       string
	EnvVar      string
	Hidden      bool
	Value       time.Duration
	Destination *time.Duration
}

DurationFlag is a flag with type time.Duration (see https://golang.org/pkg/time/#ParseDuration)

func (DurationFlag) Apply

func (f DurationFlag) Apply(set *flag.FlagSet)

Apply populates the flag given the flag set and environment Ignores errors

func (DurationFlag) ApplyWithError

func (f DurationFlag) ApplyWithError(set *flag.FlagSet) error

ApplyWithError populates the flag given the flag set and environment

func (DurationFlag) GetName

func (f DurationFlag) GetName() string

GetName returns the name of the flag

func (DurationFlag) String

func (f DurationFlag) String() string

String returns a readable representation of this value (for usage defaults)

type ErrorFormatter

type ErrorFormatter interface {
	Format(s fmt.State, verb rune)
}

type ExitCoder

type ExitCoder interface {
	error
	ExitCode() int
}

ExitCoder is the interface checked by `App` and `Command` for a custom exit code

type ExitError

type ExitError struct {
	// contains filtered or unexported fields
}

ExitError fulfills both the builtin `error` interface and `ExitCoder`

func NewExitError

func NewExitError(message interface{}, exitCode int) *ExitError

NewExitError makes a new *ExitError

func (*ExitError) Error

func (ee *ExitError) Error() string

Error returns the string message, fulfilling the interface required by `error`

func (*ExitError) ExitCode

func (ee *ExitError) ExitCode() int

ExitCode returns the exit code, fulfilling the interface required by `ExitCoder`

type Flag

type Flag interface {
	fmt.Stringer
	// Apply Flag settings to the given flag set
	Apply(*flag.FlagSet)
	GetName() string
}

Flag is a common interface related to parsing flags in cli. For more advanced flag parsing techniques, it is recommended that this interface be implemented.

var BashCompletionFlag Flag = BoolFlag{
	Name:   "generate-bash-completion",
	Hidden: true,
}

BashCompletionFlag enables bash-completion for all commands and subcommands

var HelpFlag Flag = BoolFlag{
	Name:  "help, h",
	Usage: "show help",
}

HelpFlag prints the help for all commands and subcommands Set to the zero value (BoolFlag{}) to disable flag -- keeps subcommand unless HideHelp is set to true)

var VersionFlag Flag = BoolFlag{
	Name:  "version, v",
	Usage: "print the version",
}

VersionFlag prints the version for the application

type FlagStringFunc

type FlagStringFunc func(Flag) string

FlagStringFunc is used by the help generation to display a flag, which is expected to be a single line.

var FlagStringer FlagStringFunc = stringifyFlag

FlagStringer converts a flag definition to a string. This is used by help to display a flag.

type FlagsByName

type FlagsByName []Flag

FlagsByName is a slice of Flag.

func (FlagsByName) Len

func (f FlagsByName) Len() int

func (FlagsByName) Less

func (f FlagsByName) Less(i, j int) bool

func (FlagsByName) Swap

func (f FlagsByName) Swap(i, j int)

type Float64Flag

type Float64Flag struct {
	Name        string
	Usage       string
	EnvVar      string
	Hidden      bool
	Value       float64
	Destination *float64
}

Float64Flag is a flag with type float64

func (Float64Flag) Apply

func (f Float64Flag) Apply(set *flag.FlagSet)

Apply populates the flag given the flag set and environment Ignores errors

func (Float64Flag) ApplyWithError

func (f Float64Flag) ApplyWithError(set *flag.FlagSet) error

ApplyWithError populates the flag given the flag set and environment

func (Float64Flag) GetName

func (f Float64Flag) GetName() string

GetName returns the name of the flag

func (Float64Flag) String

func (f Float64Flag) String() string

String returns a readable representation of this value (for usage defaults)

type Generic

type Generic interface {
	Set(value string) error
	String() string
}

Generic is a generic parseable type identified by a specific flag

type GenericFlag

type GenericFlag struct {
	Name   string
	Usage  string
	EnvVar string
	Hidden bool
	Value  Generic
}

GenericFlag is a flag with type Generic

func (GenericFlag) Apply

func (f GenericFlag) Apply(set *flag.FlagSet)

Apply takes the flagset and calls Set on the generic flag with the value provided by the user for parsing by the flag Ignores parsing errors

func (GenericFlag) ApplyWithError

func (f GenericFlag) ApplyWithError(set *flag.FlagSet) error

ApplyWithError takes the flagset and calls Set on the generic flag with the value provided by the user for parsing by the flag

func (GenericFlag) GetName

func (f GenericFlag) GetName() string

GetName returns the name of the flag

func (GenericFlag) String

func (f GenericFlag) String() string

String returns a readable representation of this value (for usage defaults)

type Int64Flag

type Int64Flag struct {
	Name        string
	Usage       string
	EnvVar      string
	Hidden      bool
	Value       int64
	Destination *int64
}

Int64Flag is a flag with type int64

func (Int64Flag) Apply

func (f Int64Flag) Apply(set *flag.FlagSet)

Apply populates the flag given the flag set and environment Ignores errors

func (Int64Flag) ApplyWithError

func (f Int64Flag) ApplyWithError(set *flag.FlagSet) error

ApplyWithError populates the flag given the flag set and environment

func (Int64Flag) GetName

func (f Int64Flag) GetName() string

GetName returns the name of the flag

func (Int64Flag) String

func (f Int64Flag) String() string

String returns a readable representation of this value (for usage defaults)

type Int64Slice

type Int64Slice []int64

Int64Slice is an opaque type for []int to satisfy flag.Value and flag.Getter

func (*Int64Slice) Get

func (f *Int64Slice) Get() interface{}

Get returns the slice of ints set by this flag

func (*Int64Slice) Set

func (f *Int64Slice) Set(value string) error

Set parses the value into an integer and appends it to the list of values

func (*Int64Slice) String

func (f *Int64Slice) String() string

String returns a readable representation of this value (for usage defaults)

func (*Int64Slice) Value

func (f *Int64Slice) Value() []int64

Value returns the slice of ints set by this flag

type Int64SliceFlag

type Int64SliceFlag struct {
	Name   string
	Usage  string
	EnvVar string
	Hidden bool
	Value  *Int64Slice
}

Int64SliceFlag is a flag with type *Int64Slice

func (Int64SliceFlag) Apply

func (f Int64SliceFlag) Apply(set *flag.FlagSet)

Apply populates the flag given the flag set and environment Ignores errors

func (Int64SliceFlag) ApplyWithError

func (f Int64SliceFlag) ApplyWithError(set *flag.FlagSet) error

ApplyWithError populates the flag given the flag set and environment

func (Int64SliceFlag) GetName

func (f Int64SliceFlag) GetName() string

GetName returns the name of the flag

func (Int64SliceFlag) String

func (f Int64SliceFlag) String() string

String returns a readable representation of this value (for usage defaults)

type IntFlag

type IntFlag struct {
	Name        string
	Usage       string
	EnvVar      string
	Hidden      bool
	Value       int
	Destination *int
}

IntFlag is a flag with type int

func (IntFlag) Apply

func (f IntFlag) Apply(set *flag.FlagSet)

Apply populates the flag given the flag set and environment Ignores errors

func (IntFlag) ApplyWithError

func (f IntFlag) ApplyWithError(set *flag.FlagSet) error

ApplyWithError populates the flag given the flag set and environment

func (IntFlag) GetName

func (f IntFlag) GetName() string

GetName returns the name of the flag

func (IntFlag) String

func (f IntFlag) String() string

String returns a readable representation of this value (for usage defaults)

type IntSlice

type IntSlice []int

IntSlice is an opaque type for []int to satisfy flag.Value and flag.Getter

func (*IntSlice) Get

func (f *IntSlice) Get() interface{}

Get returns the slice of ints set by this flag

func (*IntSlice) Set

func (f *IntSlice) Set(value string) error

Set parses the value into an integer and appends it to the list of values

func (*IntSlice) String

func (f *IntSlice) String() string

String returns a readable representation of this value (for usage defaults)

func (*IntSlice) Value

func (f *IntSlice) Value() []int

Value returns the slice of ints set by this flag

type IntSliceFlag

type IntSliceFlag struct {
	Name   string
	Usage  string
	EnvVar string
	Hidden bool
	Value  *IntSlice
}

IntSliceFlag is a flag with type *IntSlice

func (IntSliceFlag) Apply

func (f IntSliceFlag) Apply(set *flag.FlagSet)

Apply populates the flag given the flag set and environment Ignores errors

func (IntSliceFlag) ApplyWithError

func (f IntSliceFlag) ApplyWithError(set *flag.FlagSet) error

ApplyWithError populates the flag given the flag set and environment

func (IntSliceFlag) GetName

func (f IntSliceFlag) GetName() string

GetName returns the name of the flag

func (IntSliceFlag) String

func (f IntSliceFlag) String() string

String returns a readable representation of this value (for usage defaults)

type MultiError

type MultiError struct {
	Errors []error
}

MultiError is an error that wraps multiple errors.

func NewMultiError

func NewMultiError(err ...error) MultiError

NewMultiError creates a new MultiError. Pass in one or more errors.

func (MultiError) Error

func (m MultiError) Error() string

Error implements the error interface.

type OnUsageErrorFunc

type OnUsageErrorFunc func(context *Context, err error, isSubcommand bool) error

OnUsageErrorFunc is executed if an usage error occurs. This is useful for displaying customized usage error messages. This function is able to replace the original error messages. If this function is not set, the "Incorrect usage" is displayed and the execution is interrupted.

type StringFlag

type StringFlag struct {
	Name        string
	Usage       string
	EnvVar      string
	Hidden      bool
	Value       string
	Destination *string
}

StringFlag is a flag with type string

func (StringFlag) Apply

func (f StringFlag) Apply(set *flag.FlagSet)

Apply populates the flag given the flag set and environment Ignores errors

func (StringFlag) ApplyWithError

func (f StringFlag) ApplyWithError(set *flag.FlagSet) error

ApplyWithError populates the flag given the flag set and environment

func (StringFlag) GetName

func (f StringFlag) GetName() string

GetName returns the name of the flag

func (StringFlag) String

func (f StringFlag) String() string

String returns a readable representation of this value (for usage defaults)

type StringSlice

type StringSlice []string

StringSlice is an opaque type for []string to satisfy flag.Value and flag.Getter

func (*StringSlice) Get

func (f *StringSlice) Get() interface{}

Get returns the slice of strings set by this flag

func (*StringSlice) Set

func (f *StringSlice) Set(value string) error

Set appends the string value to the list of values

func (*StringSlice) String

func (f *StringSlice) String() string

String returns a readable representation of this value (for usage defaults)

func (*StringSlice) Value

func (f *StringSlice) Value() []string

Value returns the slice of strings set by this flag

type StringSliceFlag

type StringSliceFlag struct {
	Name   string
	Usage  string
	EnvVar string
	Hidden bool
	Value  *StringSlice
}

StringSliceFlag is a flag with type *StringSlice

func (StringSliceFlag) Apply

func (f StringSliceFlag) Apply(set *flag.FlagSet)

Apply populates the flag given the flag set and environment Ignores errors

func (StringSliceFlag) ApplyWithError

func (f StringSliceFlag) ApplyWithError(set *flag.FlagSet) error

ApplyWithError populates the flag given the flag set and environment

func (StringSliceFlag) GetName

func (f StringSliceFlag) GetName() string

GetName returns the name of the flag

func (StringSliceFlag) String

func (f StringSliceFlag) String() string

String returns a readable representation of this value (for usage defaults)

type Uint64Flag

type Uint64Flag struct {
	Name        string
	Usage       string
	EnvVar      string
	Hidden      bool
	Value       uint64
	Destination *uint64
}

Uint64Flag is a flag with type uint64

func (Uint64Flag) Apply

func (f Uint64Flag) Apply(set *flag.FlagSet)

Apply populates the flag given the flag set and environment Ignores errors

func (Uint64Flag) ApplyWithError

func (f Uint64Flag) ApplyWithError(set *flag.FlagSet) error

ApplyWithError populates the flag given the flag set and environment

func (Uint64Flag) GetName

func (f Uint64Flag) GetName() string

GetName returns the name of the flag

func (Uint64Flag) String

func (f Uint64Flag) String() string

String returns a readable representation of this value (for usage defaults)

type UintFlag

type UintFlag struct {
	Name        string
	Usage       string
	EnvVar      string
	Hidden      bool
	Value       uint
	Destination *uint
}

UintFlag is a flag with type uint

func (UintFlag) Apply

func (f UintFlag) Apply(set *flag.FlagSet)

Apply populates the flag given the flag set and environment Ignores errors

func (UintFlag) ApplyWithError

func (f UintFlag) ApplyWithError(set *flag.FlagSet) error

ApplyWithError populates the flag given the flag set and environment

func (UintFlag) GetName

func (f UintFlag) GetName() string

GetName returns the name of the flag

func (UintFlag) String

func (f UintFlag) String() string

String returns a readable representation of this value (for usage defaults)

Documentation was rendered with GOOS=linux and GOARCH=amd64.

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