godoc-current.txt

package cli // import "github.com/urfave/cli/v3"

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.App{}).Run(os.Args)
    }

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

    func main() {
    	app := &cli.App{
      		Name: "greet",
      		Usage: "say a greeting",
      		Action: func(c *cli.Context) error {
      			fmt.Println("Greetings")
      			return nil
      		},
    	}

    	app.Run(os.Args)
    }

VARIABLES

var (
	SuggestFlag               SuggestFlagFunc    = suggestFlag
	SuggestCommand            SuggestCommandFunc = suggestCommand
	SuggestDidYouMeanTemplate string             = suggestDidYouMeanTemplate
)
var AppHelpTemplate = `NAME:
   {{template "helpNameTemplate" .}}

USAGE:
   {{if .UsageText}}{{wrap .UsageText 3}}{{else}}{{.HelpName}} {{if .VisibleFlags}}[global options]{{end}}{{if .Commands}} command [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Version}}{{if not .HideVersion}}

VERSION:
   {{.Version}}{{end}}{{end}}{{if .Description}}

DESCRIPTION:
   {{template "descriptionTemplate" .}}{{end}}
{{- if len .Authors}}

AUTHOR{{template "authorsTemplate" .}}{{end}}{{if .VisibleCommands}}

COMMANDS:{{template "visibleCommandCategoryTemplate" .}}{{end}}{{if .VisibleFlagCategories}}

GLOBAL OPTIONS:{{template "visibleFlagCategoryTemplate" .}}{{else if .VisibleFlags}}

GLOBAL OPTIONS:{{template "visibleFlagTemplate" .}}{{end}}{{if .Copyright}}

COPYRIGHT:
   {{template "copyrightTemplate" .}}{{end}}
`
    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 = `NAME:
   {{template "helpNameTemplate" .}}

USAGE:
   {{template "usageTemplate" .}}{{if .Category}}

CATEGORY:
   {{.Category}}{{end}}{{if .Description}}

DESCRIPTION:
   {{template "descriptionTemplate" .}}{{end}}{{if .VisibleFlagCategories}}

OPTIONS:{{template "visibleFlagCategoryTemplate" .}}{{else if .VisibleFlags}}

OPTIONS:{{template "visibleFlagTemplate" .}}{{end}}
`
    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 (
	DefaultInverseBoolPrefix = "no-"
)
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 FishCompletionTemplate = `# {{ .App.Name }} fish shell completion

function __fish_{{ .App.Name }}_no_subcommand --description 'Test if there has been any subcommand yet'
    for i in (commandline -opc)
        if contains -- $i{{ range $v := .AllCommands }} {{ $v }}{{ end }}
            return 1
        end
    end
    return 0
end

{{ range $v := .Completions }}{{ $v }}
{{ end }}`
var MarkdownDocTemplate = `{{if gt .SectionNum 0}}% {{ .App.Name }} {{ .SectionNum }}

{{end}}# NAME

{{ .App.Name }}{{ if .App.Usage }} - {{ .App.Usage }}{{ end }}

# SYNOPSIS

{{ .App.Name }}
{{ if .SynopsisArgs }}
` + "```" + `
{{ range $v := .SynopsisArgs }}{{ $v }}{{ end }}` + "```" + `
{{ end }}{{ if .App.Description }}
# DESCRIPTION

{{ .App.Description }}
{{ end }}
**Usage**:

` + "```" + `{{ if .App.UsageText }}
{{ .App.UsageText }}
{{ else }}
{{ .App.Name }} [GLOBAL OPTIONS] command [COMMAND OPTIONS] [ARGUMENTS...]
{{ end }}` + "```" + `
{{ if .GlobalArgs }}
# GLOBAL OPTIONS
{{ range $v := .GlobalArgs }}
{{ $v }}{{ end }}
{{ end }}{{ if .Commands }}
# COMMANDS
{{ range $v := .Commands }}
{{ $v }}{{ end }}{{ end }}`
var NewFloat64Slice = NewSliceBase[float64, NoConfig, float64Value]
var NewInt64Slice = NewSliceBase[int64, IntegerConfig, int64Value]
var NewIntSlice = NewSliceBase[int, IntegerConfig, intValue]
var NewStringMap = NewMapBase[string, StringConfig, stringValue]
var NewStringSlice = NewSliceBase[string, StringConfig, stringValue]
var NewUint64Slice = NewSliceBase[uint64, IntegerConfig, uint64Value]
var NewUintSlice = NewSliceBase[uint, IntegerConfig, uintValue]
var OsExiter = os.Exit
    OsExiter is the function used when the app exits. If not set defaults to
    os.Exit.

var SubcommandHelpTemplate = `NAME:
   {{template "helpNameTemplate" .}}

USAGE:
   {{if .UsageText}}{{wrap .UsageText 3}}{{else}}{{.HelpName}} {{if .VisibleCommands}}command [command options] {{end}}{{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Description}}

DESCRIPTION:
   {{template "descriptionTemplate" .}}{{end}}{{if .VisibleCommands}}

COMMANDS:{{template "visibleCommandTemplate" .}}{{end}}{{if .VisibleFlagCategories}}

OPTIONS:{{template "visibleFlagCategoryTemplate" .}}{{else if .VisibleFlags}}

OPTIONS:{{template "visibleFlagTemplate" .}}{{end}}
`
    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

var HelpPrinter helpPrinter = printHelp
    HelpPrinter is a function that writes the help output. If not set
    explicitly, this calls HelpPrinterCustom using only the default template
    functions.

    If custom logic for printing help is required, this function can be
    overridden. If the ExtraInfo field is defined on an App, this function
    should not be modified, as HelpPrinterCustom will be used directly in order
    to capture the extra information.

var HelpPrinterCustom helpPrinterCustom = printHelpCustom
    HelpPrinterCustom is a function that writes the help output. It is used as
    the default implementation of HelpPrinter, and may be called directly if the
    ExtraInfo field is set on an App.

    In the default implementation, if the customFuncs argument contains a
    "wrapAt" key, which is a function which takes no arguments and returns an
    int, this int value will be used to produce a "wrap" function used by the
    default template to wrap long lines.


FUNCTIONS

func DefaultAppComplete(cCtx *Context)
    DefaultAppComplete prints the list of subcommands as the default app
    completion method

func DefaultCompleteWithFlags(cmd *Command) func(cCtx *Context)
func FlagNames(name string, aliases []string) []string
func HandleExitCoder(err error)
    HandleExitCoder handles errors implementing ExitCoder by printing their
    message and calling OsExiter with the given exit code.

    If the given error instead implements MultiError, each error will be checked
    for the ExitCoder interface, and OsExiter will be called with the last exit
    code found, or exit code 1 if no ExitCoder is found.

    This function is the default error-handling behavior for an App.

func ShowAppHelp(cCtx *Context) error
    ShowAppHelp is an action that displays the help.

func ShowAppHelpAndExit(c *Context, exitCode int)
    ShowAppHelpAndExit - Prints the list of subcommands for the app and exits
    with exit code.

func ShowCommandHelp(ctx *Context, command string) error
    ShowCommandHelp prints help for the given command

func ShowCommandHelpAndExit(c *Context, command string, code int)
    ShowCommandHelpAndExit - exits with code after showing help

func ShowCompletions(cCtx *Context)
    ShowCompletions prints the lists of commands within a given context

func ShowSubcommandHelp(cCtx *Context) error
    ShowSubcommandHelp prints help for the given subcommand

func ShowSubcommandHelpAndExit(c *Context, exitCode int)
    ShowSubcommandHelpAndExit - Prints help for the given subcommand and exits
    with exit code.

func ShowVersion(cCtx *Context)
    ShowVersion prints the version number of the App


TYPES

type ActionFunc func(*Context) error
    ActionFunc is the action to execute when no subcommands are specified

type ActionableFlag interface {
	Flag
	RunAction(*Context) error
}
    ActionableFlag is an interface that wraps Flag interface and RunAction
    operation.

type AfterFunc func(*Context) error
    AfterFunc is an action that executes after any subcommands are run and have
    finished. The AfterFunc is run even if Action() panics.

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
	// DefaultCommand is the (optional) name of a command
	// to run if no command names are passed as CLI arguments.
	DefaultCommand string
	// List of commands to execute
	Commands []*Command
	// List of flags to parse
	Flags []Flag
	// Boolean to enable shell completion commands
	EnableShellCompletion bool
	// Shell Completion generation command name
	ShellCompletionCommandName string
	// Boolean to hide built-in help command and help flag
	HideHelp bool
	// Boolean to hide built-in help command but keep help flag.
	// Ignored if HideHelp is true.
	HideHelpCommand bool
	// Boolean to hide built-in version flag and the VERSION section of help
	HideVersion bool

	// An action to execute when the shell completion flag is set
	ShellComplete ShellCompleteFunc
	// 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
	Action ActionFunc
	// Execute this function if the proper command cannot be found
	CommandNotFound CommandNotFoundFunc
	// Execute this function if a usage error occurs
	OnUsageError OnUsageErrorFunc
	// Execute this function when an invalid flag is accessed from the context
	InvalidFlagAccessHandler InvalidFlagAccessFunc
	// List of all authors who contributed (string or fmt.Stringer)
	Authors []any // TODO: ~string | fmt.Stringer when interface unions are available
	// Copyright of the binary if any
	Copyright string
	// Reader reader to write input to (useful for tests)
	Reader io.Reader
	// Writer writer to write output to
	Writer io.Writer
	// ErrWriter writes error output
	ErrWriter io.Writer
	// ExitErrHandler processes any error encountered while running an App before
	// it is returned to the caller. If no function is provided, HandleExitCoder
	// is used as the default behavior.
	ExitErrHandler ExitErrHandlerFunc
	// 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
	// SliceFlagSeparator is used to customize the separator for SliceFlag, the default is ","
	SliceFlagSeparator string
	// DisableSliceFlagSeparator is used to disable SliceFlagSeparator, the default is false
	DisableSliceFlagSeparator bool
	// Boolean to enable short-option handling so user can combine several
	// single-character bool arguments into one
	// i.e. foobar -o -v -> foobar -ov
	UseShortOptionHandling bool
	// Enable suggestions for commands and flags
	Suggest bool
	// Allows global flags set by libraries which use flag.XXXVar(...) directly
	// to be parsed through this library
	AllowExtFlags bool
	// Treat all flags as normal arguments if true
	SkipFlagParsing bool
	// Flag exclusion group
	MutuallyExclusiveFlags []MutuallyExclusiveFlags
	// Use longest prefix match for commands
	PrefixMatchCommands bool
	// Custom suggest command for matching
	SuggestCommandFunc SuggestCommandFunc

	// Has unexported fields.
}
    App is the main structure of a cli application.

func (a *App) Command(name string) *Command
    Command returns the named command on App. Returns nil if the command does
    not exist

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

func (a *App) RunContext(ctx context.Context, arguments []string) (err error)
    RunContext is like Run except it takes a Context that will be passed to
    its commands and sub-commands. Through this, you can propagate timeouts and
    cancellation requests

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 (a *App) ToFishCompletion() (string, error)
    ToFishCompletion creates a fish completion string for the `*App` The
    function errors if either parsing or writing of the string fails.

func (a *App) ToMan() (string, error)
    ToMan creates a man page string for the `*App` The function errors if either
    parsing or writing of the string fails.

func (a *App) ToManWithSection(sectionNumber int) (string, error)
    ToMan creates a man page string with section number for the `*App` The
    function errors if either parsing or writing of the string fails.

func (a *App) ToMarkdown() (string, error)
    ToMarkdown creates a markdown string for the `*App` The function errors if
    either parsing or writing of the string fails.

func (a *App) VisibleCategories() []CommandCategory
    VisibleCategories returns a slice of categories and commands that are
    Hidden=false

func (a *App) VisibleCommands() []*Command
    VisibleCommands returns a slice of the Commands with Hidden=false

func (a *App) VisibleFlagCategories() []VisibleFlagCategory
    VisibleFlagCategories returns a slice containing all the categories with the
    flags they contain

func (a *App) VisibleFlags() []Flag
    VisibleFlags returns a slice of the Flags with Hidden=false

type Args interface {
	// Get returns the nth argument, or else a blank string
	Get(n int) string
	// First returns the first argument, or else a blank string
	First() string
	// Tail returns the rest of the arguments (not the first one)
	// or else an empty string slice
	Tail() []string
	// Len returns the length of the wrapped slice
	Len() int
	// Present checks if there are any arguments present
	Present() bool
	// Slice returns a copy of the internal slice
	Slice() []string
}

type BeforeFunc func(*Context) error
    BeforeFunc is an action that executes prior to any subcommands being run
    once the context is ready. If a non-nil error is returned, no subcommands
    are run.

type BoolConfig struct {
	Count *int
}
    BoolConfig defines the configuration for bool flags

type BoolFlag = FlagBase[bool, BoolConfig, boolValue]

type BoolWithInverseFlag struct {
	// The BoolFlag which the positive and negative flags are generated from
	*BoolFlag

	// The prefix used to indicate a negative value
	// Default: `env` becomes `no-env`
	InversePrefix string

	// Has unexported fields.
}

func (s *BoolWithInverseFlag) Apply(set *flag.FlagSet) error

func (s *BoolWithInverseFlag) Flags() []Flag

func (s *BoolWithInverseFlag) IsSet() bool

func (s *BoolWithInverseFlag) Names() []string

func (s *BoolWithInverseFlag) RunAction(ctx *Context) error

func (s *BoolWithInverseFlag) String() string
    Example for BoolFlag{Name: "env"} --env (default: false) || --no-env
    (default: false)

func (s *BoolWithInverseFlag) Value() bool

type CategorizableFlag interface {
	VisibleFlag

	// Returns the category of the flag
	GetCategory() string
}
    CategorizableFlag is an interface that allows us to potentially use a flag
    in a categorized representation.

type Command struct {
	// The name of the command
	Name 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 shell command completions
	ShellComplete ShellCompleteFunc
	// 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 ActionFunc
	// Execute this function if a usage error occurs.
	OnUsageError OnUsageErrorFunc
	// List of child commands
	Commands []*Command
	// List of flags to parse
	Flags []Flag

	// Treat all flags as normal arguments if true
	SkipFlagParsing bool
	// Boolean to hide built-in help command and help flag
	HideHelp bool
	// Boolean to hide built-in help command but keep help flag
	// Ignored if HideHelp is true.
	HideHelpCommand bool
	// Boolean to hide this command from help or completion
	Hidden bool
	// Boolean to enable short-option handling so user can combine several
	// single-character bool arguments into one
	// i.e. foobar -o -v -> foobar -ov
	UseShortOptionHandling 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

	// Use longest prefix match for commands
	PrefixMatchCommands bool

	// Flag exclusion group
	MutuallyExclusiveFlags []MutuallyExclusiveFlags
	// Has unexported fields.
}
    Command is a subcommand for a cli.App.

func (cmd *Command) Command(name string) *Command

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 (c *Command) HasName(name string) bool
    HasName returns true if Command.Name matches given name

func (c *Command) Names() []string
    Names returns the names including short names and aliases.

func (c *Command) Run(cCtx *Context, arguments ...string) (err error)

func (c *Command) VisibleCategories() []CommandCategory
    VisibleCategories returns a slice of categories and commands that are
    Hidden=false

func (c *Command) VisibleCommands() []*Command
    VisibleCommands returns a slice of the Commands with Hidden=false

func (c *Command) VisibleFlagCategories() []VisibleFlagCategory
    VisibleFlagCategories returns a slice containing all the visible flag
    categories with the flags they contain

func (c *Command) VisibleFlags() []Flag
    VisibleFlags returns a slice of the Flags with Hidden=false

type CommandCategories interface {
	// AddCommand adds a command to a category, creating a new category if necessary.
	AddCommand(category string, command *Command)
	// Categories returns a slice of categories sorted by name
	Categories() []CommandCategory
}
    CommandCategories interface allows for category manipulation

type CommandCategory interface {
	// Name returns the category name string
	Name() string
	// VisibleCommands returns a slice of the Commands with Hidden=false
	VisibleCommands() []*Command
}
    CommandCategory is a category containing commands.

type CommandNotFoundFunc func(*Context, string)
    CommandNotFoundFunc is executed if the proper command cannot be found

type Commands []*Command

type CommandsByName []*Command

func (c CommandsByName) Len() int

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

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

type Context struct {
	context.Context
	App     *App
	Command *Command

	// Has 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(app *App, set *flag.FlagSet, parentCtx *Context) *Context
    NewContext creates a new context. For use in when invoking an App or Command
    action.

func (cCtx *Context) Args() Args
    Args returns the command line arguments associated with the context.

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

func (cCtx *Context) Count(name string) int
    Count returns the num of occurrences of this flag

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

func (cCtx *Context) FlagNames() []string
    FlagNames returns a slice of flag names used by the this context and all of
    its parent contexts.

func (cCtx *Context) Float64(name string) float64
    Int looks up the value of a local IntFlag, returns 0 if not found

func (cCtx *Context) Float64Slice(name string) []float64
    Float64Slice looks up the value of a local Float64SliceFlag, returns nil if
    not found

func (cCtx *Context) Int(name string) int
    Int looks up the value of a local IntFlag, returns 0 if not found

func (cCtx *Context) Int64(name string) int64
    Int64 looks up the value of a local Int64Flag, returns 0 if not found

func (cCtx *Context) Int64Slice(name string) []int64
    Int64Slice looks up the value of a local Int64SliceFlag, returns nil if not
    found

func (cCtx *Context) IntSlice(name string) []int
    IntSlice looks up the value of a local IntSliceFlag, returns nil if not
    found

func (cCtx *Context) IsSet(name string) bool
    IsSet determines if the flag was actually set

func (cCtx *Context) Lineage() []*Context
    Lineage returns *this* context and all of its ancestor contexts in order
    from child to parent

func (cCtx *Context) LocalFlagNames() []string
    LocalFlagNames returns a slice of flag names used in this context.

func (cCtx *Context) NArg() int
    NArg returns the number of the command line arguments.

func (cCtx *Context) NumFlags() int
    NumFlags returns the number of flags set

func (cCtx *Context) Set(name, value string) error
    Set sets a context flag to a value.

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

func (cCtx *Context) StringMap(name string) map[string]string
    StringMap looks up the value of a local StringMapFlag, returns nil if not
    found

func (cCtx *Context) StringSlice(name string) []string
    StringSlice looks up the value of a local StringSliceFlag, returns nil if
    not found

func (cCtx *Context) Timestamp(name string) *time.Time
    Timestamp gets the timestamp from a flag name

func (cCtx *Context) Uint(name string) uint
    Uint looks up the value of a local UintFlag, returns 0 if not found

func (cCtx *Context) Uint64(name string) uint64
    Uint64 looks up the value of a local Uint64Flag, returns 0 if not found

func (cCtx *Context) Uint64Slice(name string) []uint64
    Uint64Slice looks up the value of a local Uint64SliceFlag, returns nil if
    not found

func (cCtx *Context) UintSlice(name string) []uint
    UintSlice looks up the value of a local UintSliceFlag, returns nil if not
    found

func (cCtx *Context) Value(name string) interface{}
    Value returns the value of the flag corresponding to `name`

type Countable interface {
	Count() int
}
    Countable is an interface to enable detection of flag values which support
    repetitive flags

type DocGenerationFlag interface {
	Flag

	// TakesValue returns true if the flag takes a value, otherwise false
	TakesValue() bool

	// GetUsage returns the usage string for the flag
	GetUsage() string

	// GetValue returns the flags value as string representation and an empty
	// string if the flag takes no value at all.
	GetValue() string

	// GetDefaultText returns the default text for this flag
	GetDefaultText() string

	// GetEnvVars returns the env vars for this flag
	GetEnvVars() []string
}
    DocGenerationFlag is an interface that allows documentation generation for
    the flag

type DocGenerationMultiValueFlag interface {
	DocGenerationFlag

	// IsMultiValueFlag returns true for flags that can be given multiple times.
	IsMultiValueFlag() bool
}
    DocGenerationSliceFlag extends DocGenerationFlag for slice/map based flags.

type DurationFlag = FlagBase[time.Duration, NoConfig, durationValue]

type ErrorFormatter interface {
	Format(s fmt.State, verb rune)
}
    ErrorFormatter is the interface that will suitably format the error output

type ExitCoder interface {
	error
	ExitCode() int
}
    ExitCoder is the interface checked by `App` and `Command` for a custom exit
    code

func Exit(message interface{}, exitCode int) ExitCoder
    Exit wraps a message and exit code into an error, which by default is
    handled with a call to os.Exit during default error handling.

    This is the simplest way to trigger a non-zero exit code for an App
    without having to call os.Exit manually. During testing, this behavior
    can be avoided by overriding the ExitErrHandler function on an App or the
    package-global OsExiter function.

type ExitErrHandlerFunc func(cCtx *Context, err error)
    ExitErrHandlerFunc is executed if provided in order to handle exitError
    values returned by Actions and Before/After functions.

type Flag interface {
	fmt.Stringer

	// Apply Flag settings to the given flag set
	Apply(*flag.FlagSet) error

	// All possible names for this flag
	Names() []string

	// Whether the flag has been set or not
	IsSet() bool
}
    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-shell-completion",
	Hidden: true,
}
    BashCompletionFlag enables bash-completion for all commands and subcommands

var HelpFlag Flag = &BoolFlag{
	Name:    "help",
	Aliases: []string{"h"},
	Usage:   "show help",
}
    HelpFlag prints the help for all commands and subcommands. Set to nil to
    disable the flag. The subcommand will still be added unless HideHelp or
    HideHelpCommand is set to true.

var VersionFlag Flag = &BoolFlag{
	Name:    "version",
	Aliases: []string{"v"},
	Usage:   "print the version",
}
    VersionFlag prints the version for the application

type FlagBase[T any, C any, VC ValueCreator[T, C]] struct {
	Name string // name of the flag

	Category    string   // category of the flag, if any
	DefaultText string   // default text of the flag for usage purposes
	FilePaths   []string // file paths to load value from
	Usage       string   // usage string for help output

	Required   bool // whether the flag is required or not
	Hidden     bool // whether to hide the flag in help output
	Persistent bool // whether the flag needs to be applied to subcommands as well

	Value       T  // default value for this flag if not set by from any source
	Destination *T // destination pointer for value when set

	Aliases []string // Aliases that are allowed for this flag
	EnvVars []string // Set of environment variables that can influence this flag's value

	TakesFile bool // whether this flag takes a file argument, mainly for shell completion purposes

	Action func(*Context, T) error // Action callback to be called when flag is set

	Config C // Additional/Custom configuration associated with this flag type

	OnlyOnce bool // whether this flag can be duplicated on the command line

	// Has unexported fields.
}
    FlagBase[T,C,VC] is a generic flag base which can be used as a boilerplate
    to implement the most common interfaces used by urfave/cli.

        T specifies the type
        C specifies the configuration required(if any for that flag type)
        VC specifies the value creator which creates the flag.Value emulation

func (f *FlagBase[T, C, V]) Apply(set *flag.FlagSet) error
    Apply populates the flag given the flag set and environment

func (f *FlagBase[T, C, V]) Get(ctx *Context) T
    Get returns the flag’s value in the given Context.

func (f *FlagBase[T, C, V]) GetCategory() string
    GetCategory returns the category of the flag

func (f *FlagBase[T, C, V]) GetDefaultText() string
    GetDefaultText returns the default text for this flag

func (f *FlagBase[T, C, V]) GetEnvVars() []string
    GetEnvVars returns the env vars for this flag

func (f *FlagBase[T, C, V]) GetUsage() string
    GetUsage returns the usage string for the flag

func (f *FlagBase[T, C, V]) GetValue() string
    GetValue returns the flags value as string representation and an empty
    string if the flag takes no value at all.

func (f *FlagBase[T, C, VC]) IsMultiValueFlag() bool
    IsMultiValueFlag returns true if the value type T can take multiple values
    from cmd line. This is true for slice and map type flags

func (f *FlagBase[T, C, VC]) IsPersistent() bool
    IsPersistent returns true if flag needs to be persistent across subcommands

func (f *FlagBase[T, C, V]) IsRequired() bool
    IsRequired returns whether or not the flag is required

func (f *FlagBase[T, C, V]) IsSet() bool
    IsSet returns whether or not the flag has been set through env or file

func (f *FlagBase[T, C, V]) IsVisible() bool
    IsVisible returns true if the flag is not hidden, otherwise false

func (f *FlagBase[T, C, V]) Names() []string
    Names returns the names of the flag

func (f *FlagBase[T, C, V]) RunAction(ctx *Context) error
    RunAction executes flag action if set

func (f *FlagBase[T, C, V]) String() string
    String returns a readable representation of this value (for usage defaults)

func (f *FlagBase[T, C, V]) TakesValue() bool
    TakesValue returns true if the flag takes a value, otherwise false

type FlagCategories interface {
	// AddFlags adds a flag to a category, creating a new category if necessary.
	AddFlag(category string, fl Flag)
	// VisibleCategories returns a slice of visible flag categories sorted by name
	VisibleCategories() []VisibleFlagCategory
}
    FlagCategories interface allows for category manipulation

type FlagEnvHintFunc func(envVars []string, str string) string
    FlagEnvHintFunc is used by the default FlagStringFunc to annotate flag help
    with the environment variable details.

var FlagEnvHinter FlagEnvHintFunc = withEnvHint
    FlagEnvHinter annotates flag help message with the environment variable
    details. This is used by the default FlagStringer.

type FlagFileHintFunc func(filePath, str string) string
    FlagFileHintFunc is used by the default FlagStringFunc to annotate flag help
    with the file path details.

var FlagFileHinter FlagFileHintFunc = withFileHint
    FlagFileHinter annotates flag help message with the environment variable
    details. This is used by the default FlagStringer.

type FlagNamePrefixFunc func(fullName []string, placeholder string) string
    FlagNamePrefixFunc is used by the default FlagStringFunc to create prefix
    text for a flag's full name.

var FlagNamePrefixer FlagNamePrefixFunc = prefixedNames
    FlagNamePrefixer converts a full flag name and its placeholder into the help
    message flag prefix. This is used by the default FlagStringer.

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 []Flag
    FlagsByName is a slice of Flag.

func (f FlagsByName) Len() int

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

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

type Float64Flag = FlagBase[float64, NoConfig, float64Value]

type Float64Slice = SliceBase[float64, NoConfig, float64Value]

type Float64SliceFlag = FlagBase[[]float64, NoConfig, Float64Slice]

type Int64Flag = FlagBase[int64, IntegerConfig, int64Value]

type Int64Slice = SliceBase[int64, IntegerConfig, int64Value]

type Int64SliceFlag = FlagBase[[]int64, IntegerConfig, Int64Slice]

type IntFlag = FlagBase[int, IntegerConfig, intValue]

type IntSlice = SliceBase[int, IntegerConfig, intValue]

type IntSliceFlag = FlagBase[[]int, IntegerConfig, IntSlice]

type IntegerConfig struct {
	Base int
}
    IntegerConfig is the configuration for all integer type flags

type InvalidFlagAccessFunc func(*Context, string)
    InvalidFlagAccessFunc is executed when an invalid flag is accessed from the
    context.

type MapBase[T any, C any, VC ValueCreator[T, C]] struct {
	// Has unexported fields.
}
    MapBase wraps map[string]T to satisfy flag.Value

func NewMapBase[T any, C any, VC ValueCreator[T, C]](defaults map[string]T) *MapBase[T, C, VC]
    NewMapBase makes a *MapBase with default values

func (i MapBase[T, C, VC]) Create(val map[string]T, p *map[string]T, c C) Value

func (i *MapBase[T, C, VC]) Get() interface{}
    Get returns the mapping of values set by this flag

func (i *MapBase[T, C, VC]) Serialize() string
    Serialize allows MapBase to fulfill Serializer

func (i *MapBase[T, C, VC]) Set(value string) error
    Set parses the value and appends it to the list of values

func (i *MapBase[T, C, VC]) String() string
    String returns a readable representation of this value (for usage defaults)

func (i MapBase[T, C, VC]) ToString(t map[string]T) string

func (i *MapBase[T, C, VC]) Value() map[string]T
    Value returns the mapping of values set by this flag

type MultiError interface {
	error
	Errors() []error
}
    MultiError is an error that wraps multiple errors.

type MutuallyExclusiveFlags struct {
	// Flag list
	Flags [][]Flag

	// whether this group is required
	Required bool
}
    MutuallyExclusiveFlags defines a mutually exclusive flag group Multiple
    option paths can be provided out of which only one can be defined on cmdline
    So for example [ --foo | [ --bar something --darth somethingelse ] ]

type NoConfig struct{}
    NoConfig is for flags which dont need a custom configuration

type OnUsageErrorFunc func(cCtx *Context, err error, isSubcommand bool) error
    OnUsageErrorFunc is executed if a 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 PersistentFlag interface {
	IsPersistent() bool
}
    PersistentFlag is an interface to enable detection of flags which are
    persistent through subcommands

type RequiredFlag interface {
	Flag

	// whether the flag is a required flag or not
	IsRequired() bool
}
    RequiredFlag is an interface that allows us to mark flags as required
    it allows flags required flags to be backwards compatible with the Flag
    interface

type Serializer interface {
	Serialize() string
}
    Serializer is used to circumvent the limitations of flag.FlagSet.Set

type ShellCompleteFunc func(*Context)
    ShellCompleteFunc is an action to execute when the shell completion flag is
    set

type SliceBase[T any, C any, VC ValueCreator[T, C]] struct {
	// Has unexported fields.
}
    SliceBase wraps []T to satisfy flag.Value

func NewSliceBase[T any, C any, VC ValueCreator[T, C]](defaults ...T) *SliceBase[T, C, VC]
    NewIntSlice makes an *IntSlice with default values

func (i SliceBase[T, C, VC]) Create(val []T, p *[]T, c C) Value

func (i *SliceBase[T, C, VC]) Get() interface{}
    Get returns the slice of values set by this flag

func (i *SliceBase[T, C, VC]) Serialize() string
    Serialize allows SliceBase to fulfill Serializer

func (i *SliceBase[T, C, VC]) Set(value string) error
    Set parses the value and appends it to the list of values

func (i *SliceBase[T, C, VC]) SetOne(value T)
    SetOne directly adds a value to the list of values

func (i *SliceBase[T, C, VC]) String() string
    String returns a readable representation of this value (for usage defaults)

func (i SliceBase[T, C, VC]) ToString(t []T) string

func (i *SliceBase[T, C, VC]) Value() []T
    Value returns the slice of values set by this flag

type StringConfig struct {
	// Whether to trim whitespace of parsed value
	TrimSpace bool
}
    StringConfig defines the configuration for string flags

type StringFlag = FlagBase[string, StringConfig, stringValue]

type StringMap = MapBase[string, StringConfig, stringValue]

type StringMapFlag = FlagBase[map[string]string, StringConfig, StringMap]

type StringSlice = SliceBase[string, StringConfig, stringValue]

type StringSliceFlag = FlagBase[[]string, StringConfig, StringSlice]

type SuggestCommandFunc func(commands []*Command, provided string) string

type SuggestFlagFunc func(flags []Flag, provided string, hideHelp bool) string

type TimestampConfig struct {
	Timezone *time.Location
	Layout   string
}
    TimestampConfig defines the config for timestamp flags

type TimestampFlag = FlagBase[time.Time, TimestampConfig, timestampValue]

type Uint64Flag = FlagBase[uint64, IntegerConfig, uint64Value]

type Uint64Slice = SliceBase[uint64, IntegerConfig, uint64Value]

type Uint64SliceFlag = FlagBase[[]uint64, IntegerConfig, Uint64Slice]

type UintFlag = FlagBase[uint, IntegerConfig, uintValue]

type UintSlice = SliceBase[uint, IntegerConfig, uintValue]

type UintSliceFlag = FlagBase[[]uint, IntegerConfig, UintSlice]

type Value interface {
	flag.Value
	flag.Getter
}
    Value represents a value as used by cli. For now it implements the golang
    flag.Value interface

type ValueCreator[T any, C any] interface {
	Create(T, *T, C) Value
	ToString(T) string
}
    ValueCreator is responsible for creating a flag.Value emulation as well as
    custom formatting

        T specifies the type
        C specifies the config for the type

type VisibleFlag interface {
	Flag

	// IsVisible returns true if the flag is not hidden, otherwise false
	IsVisible() bool
}
    VisibleFlag is an interface that allows to check if a flag is visible

type VisibleFlagCategory interface {
	// Name returns the category name string
	Name() string
	// Flags returns a slice of VisibleFlag sorted by name
	Flags() []VisibleFlag
}
    VisibleFlagCategory is a category containing flags.