pflags

package module
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 Go to latest Published: Mar 2, 2026 License: MIT Imports: 7 Imported by: 0

Documentation

Overview

Package pflags provides a drop-in replacement for spf13/pflag that maintains complete API compatibility while leveraging OptArgs Core for superior POSIX/GNU compliance.

Index

Constants

This section is empty.

Variables

View Source 
var CommandLine = NewFlagSet(os.Args[0], ExitOnError)

CommandLine is the default set of command-line flags, parsed from os.Args.

Functions

func Arg 

func Arg(i int) string

Arg returns the i'th command-line argument. Arg(0) is the first remaining argument after flags have been processed.

func Args 

func Args() []string

Args returns the non-flag command-line arguments.

func Bool 

func Bool(name string, value bool, usage string) *bool

Bool defines a bool flag with specified name, default value, and usage string. The return value is the address of a bool variable that stores the value of the flag.

func BoolP 

func BoolP(name, shorthand string, value bool, usage string) *bool

BoolP is like Bool, but accepts a shorthand letter that can be used after a single dash.

func BoolVar 

func BoolVar(p *bool, name string, value bool, usage string)

BoolVar defines a bool flag with specified name, default value, and usage string. The argument p points to a bool variable in which to store the value of the flag.

func BoolVarP 

func BoolVarP(p *bool, name, shorthand string, value bool, usage string)

BoolVarP is like BoolVar, but accepts a shorthand letter that can be used after a single dash.

func Duration 

func Duration(name string, value time.Duration, usage string) *time.Duration

Duration defines a time.Duration flag with specified name, default value, and usage string. The return value is the address of a time.Duration variable that stores the value of the flag.

func DurationP 

func DurationP(name, shorthand string, value time.Duration, usage string) *time.Duration

DurationP is like Duration, but accepts a shorthand letter that can be used after a single dash.

func DurationVar 

func DurationVar(p *time.Duration, name string, value time.Duration, usage string)

DurationVar defines a time.Duration flag with specified name, default value, and usage string. The argument p points to a time.Duration variable in which to store the value of the flag.

func DurationVarP 

func DurationVarP(p *time.Duration, name, shorthand string, value time.Duration, usage string)

DurationVarP is like DurationVar, but accepts a shorthand letter that can be used after a single dash.

func Float64 

func Float64(name string, value float64, usage string) *float64

Float64 defines a float64 flag with specified name, default value, and usage string. The return value is the address of a float64 variable that stores the value of the flag.

func Float64P 

func Float64P(name, shorthand string, value float64, usage string) *float64

Float64P is like Float64, but accepts a shorthand letter that can be used after a single dash.

func Float64Var 

func Float64Var(p *float64, name string, value float64, usage string)

Float64Var defines a float64 flag with specified name, default value, and usage string. The argument p points to a float64 variable in which to store the value of the flag.

func Float64VarP 

func Float64VarP(p *float64, name, shorthand string, value float64, usage string)

Float64VarP is like Float64Var, but accepts a shorthand letter that can be used after a single dash.

func Int 

func Int(name string, value int, usage string) *int

Int defines an int flag with specified name, default value, and usage string. The return value is the address of an int variable that stores the value of the flag.

func IntP 

func IntP(name, shorthand string, value int, usage string) *int

IntP is like Int, but accepts a shorthand letter that can be used after a single dash.

func IntVar 

func IntVar(p *int, name string, value int, usage string)

IntVar defines an int flag with specified name, default value, and usage string. The argument p points to an int variable in which to store the value of the flag.

func IntVarP 

func IntVarP(p *int, name, shorthand string, value int, usage string)

IntVarP is like IntVar, but accepts a shorthand letter that can be used after a single dash.

func NArg 

func NArg() int

NArg is the number of arguments remaining after flags have been processed.

func Parse 

func Parse()

Parse parses the command-line flags from os.Args[1:]. Must be called after all flags are defined and before flags are accessed by the program.

func Parsed 

func Parsed() bool

Parsed returns true if the command-line flags have been parsed.

func PrintDefaults 

func PrintDefaults()

PrintDefaults prints, to standard error unless configured otherwise, the default values of all defined command-line flags.

func Set 

func Set(name, value string) error

Set sets the value of the named command-line flag.

func String 

func String(name string, value string, usage string) *string

String defines a string flag with specified name, default value, and usage string. The return value is the address of a string variable that stores the value of the flag.

func StringP 

func StringP(name, shorthand string, value string, usage string) *string

StringP is like String, but accepts a shorthand letter that can be used after a single dash.

func StringVar 

func StringVar(p *string, name string, value string, usage string)

StringVar defines a string flag with specified name, default value, and usage string. The argument p points to a string variable in which to store the value of the flag.

func StringVarP 

func StringVarP(p *string, name, shorthand string, value string, usage string)

StringVarP is like StringVar, but accepts a shorthand letter that can be used after a single dash.

func UnquoteUsage 

func UnquoteUsage(flag *Flag) (name string, usage string)

UnquoteUsage extracts a back-quoted name from the usage string for a flag and returns it and the un-quoted usage. Given "a `name` to show" it returns ("name", "a name to show"). If there are no back quotes, the name is an educated guess of the type of the flag's value, or the empty string if the flag is boolean.

func Usage 

func Usage()

Usage prints a usage message documenting all defined command-line flags to CommandLine's output, which by default is os.Stderr.

func Var 

func Var(value Value, name string, usage string)

Var defines a flag with the specified name and usage string. The type and value of the flag are represented by the first argument, of type Value, which typically holds a user-defined implementation of Value.

func VarP 

func VarP(value Value, name, shorthand, usage string)

VarP is like Var, but accepts a shorthand letter that can be used after a single dash.

func Visit 

func Visit(fn func(*Flag))

Visit visits the command-line flags in lexicographical order, calling fn for each. It visits only those flags that have been set.

func VisitAll 

func VisitAll(fn func(*Flag))

VisitAll visits the command-line flags in lexicographical order, calling fn for each. It visits all flags, even those not set.

Types

type CoreIntegration 

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

CoreIntegration provides the translation layer between pflag Flag definitions and OptArgs Core format, handling flag registration and parsing delegation.

func NewCoreIntegration 

func NewCoreIntegration(flagSet *FlagSet) *CoreIntegration

NewCoreIntegration creates a new CoreIntegration instance for the given FlagSet.

func (*CoreIntegration) GetParser 

func (ci *CoreIntegration) GetParser() *optargs.Parser

GetParser returns the initialized OptArgs Core parser. Returns nil if InitializeParser hasn't been called successfully.

func (*CoreIntegration) InitializeParser 

func (ci *CoreIntegration) InitializeParser(args []string) error

InitializeParser creates and configures the OptArgs Core parser with all registered flags.

func (*CoreIntegration) RegisterFlag 

func (ci *CoreIntegration) RegisterFlag(flag *Flag) error

RegisterFlag converts a pflag Flag definition to OptArgs Core format and registers it. This handles the translation between pflag's Flag structure and OptArgs Core's Flag structure.

func (*CoreIntegration) TranslateError 

func (ci *CoreIntegration) TranslateError(err error) error

TranslateError converts OptArgs Core errors to pflag-compatible error messages.

type ErrorHandling 

type ErrorHandling int

ErrorHandling defines how FlagSet.Parse behaves if the parse fails. 

const (
	// ContinueOnError will return an err from Parse() if an error is found
	ContinueOnError ErrorHandling = iota
	// ExitOnError will call os.Exit(2) if an error is found when parsing
	ExitOnError
	// PanicOnError will panic() if an error is found when parsing flags
	PanicOnError
)

type Flag 

type Flag struct {
	Name        string              // name as it appears on command line
	Shorthand   string              // one-letter abbreviated flag
	Usage       string              // help message
	Value       Value               // value as set
	DefValue    string              // default value (as text); for usage message
	Changed     bool                // If the user set the value (or if left to default)
	Hidden      bool                // used by cobra.Command to allow flags to be hidden from help/usage text
	Deprecated  string              // If this flag is deprecated, this string is the new or now thing to use
	Annotations map[string][]string // used by cobra.Command bash autocomple code
}

Flag represents the state of a flag.

func Lookup 

func Lookup(name string) *Flag

Lookup returns the Flag structure of the named command-line flag, returning nil if none exists.

type FlagSet 

type FlagSet struct {
	// Usage is the function called when an error occurs while parsing flags.
	// The field is a function (not a method) that may be changed to point to
	// a custom error handler.
	Usage func()
	// contains filtered or unexported fields
}

FlagSet represents a set of defined flags.

func NewFlagSet 

func NewFlagSet(name string, errorHandling ErrorHandling) *FlagSet

NewFlagSet returns a new, empty flag set with the specified name and error handling property.

func (*FlagSet) Arg 

func (f *FlagSet) Arg(i int) string

Arg returns the i'th argument. Arg(0) is the first remaining argument after flags have been processed.

func (*FlagSet) Args 

func (f *FlagSet) Args() []string

Args returns the non-flag arguments.

func (*FlagSet) Bool 

func (f *FlagSet) Bool(name string, value bool, usage string) *bool

Bool defines a bool flag with specified name, default value, and usage string. The return value is the address of a bool variable that stores the value of the flag.

func (*FlagSet) BoolP 

func (f *FlagSet) BoolP(name, shorthand string, value bool, usage string) *bool

BoolP is like Bool, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) BoolVar 

func (f *FlagSet) BoolVar(p *bool, name string, value bool, usage string)

BoolVar defines a bool flag with specified name, default value, and usage string. The argument p points to a bool variable in which to store the value of the flag.

func (*FlagSet) BoolVarP 

func (f *FlagSet) BoolVarP(p *bool, name, shorthand string, value bool, usage string)

BoolVarP is like BoolVar, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Duration 

func (f *FlagSet) Duration(name string, value time.Duration, usage string) *time.Duration

Duration defines a time.Duration flag with specified name, default value, and usage string. The return value is the address of a time.Duration variable that stores the value of the flag.

func (*FlagSet) DurationP 

func (f *FlagSet) DurationP(name, shorthand string, value time.Duration, usage string) *time.Duration

DurationP is like Duration, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) DurationVar 

func (f *FlagSet) DurationVar(p *time.Duration, name string, value time.Duration, usage string)

DurationVar defines a time.Duration flag with specified name, default value, and usage string. The argument p points to a time.Duration variable in which to store the value of the flag.

func (*FlagSet) DurationVarP 

func (f *FlagSet) DurationVarP(p *time.Duration, name, shorthand string, value time.Duration, usage string)

DurationVarP is like DurationVar, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Float64 

func (f *FlagSet) Float64(name string, value float64, usage string) *float64

Float64 defines a float64 flag with specified name, default value, and usage string. The return value is the address of a float64 variable that stores the value of the flag.

func (*FlagSet) Float64P 

func (f *FlagSet) Float64P(name, shorthand string, value float64, usage string) *float64

Float64P is like Float64, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Float64Var 

func (f *FlagSet) Float64Var(p *float64, name string, value float64, usage string)

Float64Var defines a float64 flag with specified name, default value, and usage string. The argument p points to a float64 variable in which to store the value of the flag.

func (*FlagSet) Float64VarP 

func (f *FlagSet) Float64VarP(p *float64, name, shorthand string, value float64, usage string)

Float64VarP is like Float64Var, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Int 

func (f *FlagSet) Int(name string, value int, usage string) *int

Int defines an int flag with specified name, default value, and usage string. The return value is the address of an int variable that stores the value of the flag.

func (*FlagSet) Int64 

func (f *FlagSet) Int64(name string, value int64, usage string) *int64

Int64 defines an int64 flag with specified name, default value, and usage string. The return value is the address of an int64 variable that stores the value of the flag.

func (*FlagSet) Int64P 

func (f *FlagSet) Int64P(name, shorthand string, value int64, usage string) *int64

Int64P is like Int64, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Int64Var 

func (f *FlagSet) Int64Var(p *int64, name string, value int64, usage string)

Int64Var defines an int64 flag with specified name, default value, and usage string. The argument p points to an int64 variable in which to store the value of the flag.

func (*FlagSet) Int64VarP 

func (f *FlagSet) Int64VarP(p *int64, name, shorthand string, value int64, usage string)

Int64VarP is like Int64Var, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) IntP 

func (f *FlagSet) IntP(name, shorthand string, value int, usage string) *int

IntP is like Int, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) IntSlice 

func (f *FlagSet) IntSlice(name string, value []int, usage string) *[]int

IntSlice defines an int slice flag with specified name, default value, and usage string. The return value is the address of a []int variable that stores the value of the flag.

func (*FlagSet) IntSliceP 

func (f *FlagSet) IntSliceP(name, shorthand string, value []int, usage string) *[]int

IntSliceP is like IntSlice, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) IntSliceVar 

func (f *FlagSet) IntSliceVar(p *[]int, name string, value []int, usage string)

IntSliceVar defines an int slice flag with specified name, default value, and usage string. The argument p points to a []int variable in which to store the value of the flag.

func (*FlagSet) IntSliceVarP 

func (f *FlagSet) IntSliceVarP(p *[]int, name, shorthand string, value []int, usage string)

IntSliceVarP is like IntSliceVar, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) IntVar 

func (f *FlagSet) IntVar(p *int, name string, value int, usage string)

IntVar defines an int flag with specified name, default value, and usage string. The argument p points to an int variable in which to store the value of the flag.

func (*FlagSet) IntVarP 

func (f *FlagSet) IntVarP(p *int, name, shorthand string, value int, usage string)

IntVarP is like IntVar, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Lookup 

func (f *FlagSet) Lookup(name string) *Flag

Lookup returns the Flag structure of the named flag, returning nil if none exists.

func (*FlagSet) NArg 

func (f *FlagSet) NArg() int

NArg is the number of arguments remaining after flags have been processed.

func (*FlagSet) Name 

func (f *FlagSet) Name() string

Name returns the name of the flag set.

func (*FlagSet) Parse 

func (f *FlagSet) Parse(arguments []string) error

Parse parses flag definitions from the argument list, which should not include the command name. Must be called after all flags in the FlagSet are defined and before flags are accessed by the program. The return value will be ErrHelp if -help was set but not defined.

func (*FlagSet) Parsed 

func (f *FlagSet) Parsed() bool

Parsed reports whether f.Parse has been called.

func (*FlagSet) PrintDefaults 

func (f *FlagSet) PrintDefaults()

PrintDefaults prints, to standard error unless configured otherwise, the default values of all defined flags in the set.

func (*FlagSet) Set 

func (f *FlagSet) Set(name, value string) error

Set sets the value of the named flag.

func (*FlagSet) SetOutput 

func (f *FlagSet) SetOutput(output io.Writer)

SetOutput sets the destination for usage and error messages. If output is nil, os.Stderr is used.

func (*FlagSet) String 

func (f *FlagSet) String(name string, value string, usage string) *string

String defines a string flag with specified name, default value, and usage string. The return value is the address of a string variable that stores the value of the flag.

func (*FlagSet) StringP 

func (f *FlagSet) StringP(name, shorthand string, value string, usage string) *string

StringP is like String, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) StringSlice 

func (f *FlagSet) StringSlice(name string, value []string, usage string) *[]string

StringSlice defines a string slice flag with specified name, default value, and usage string. The return value is the address of a []string variable that stores the value of the flag.

func (*FlagSet) StringSliceP 

func (f *FlagSet) StringSliceP(name, shorthand string, value []string, usage string) *[]string

StringSliceP is like StringSlice, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) StringSliceVar 

func (f *FlagSet) StringSliceVar(p *[]string, name string, value []string, usage string)

StringSliceVar defines a string slice flag with specified name, default value, and usage string. The argument p points to a []string variable in which to store the value of the flag.

func (*FlagSet) StringSliceVarP 

func (f *FlagSet) StringSliceVarP(p *[]string, name, shorthand string, value []string, usage string)

StringSliceVarP is like StringSliceVar, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) StringVar 

func (f *FlagSet) StringVar(p *string, name string, value string, usage string)

StringVar defines a string flag with specified name, default value, and usage string. The argument p points to a string variable in which to store the value of the flag.

func (*FlagSet) StringVarP 

func (f *FlagSet) StringVarP(p *string, name, shorthand string, value string, usage string)

StringVarP is like StringVar, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Uint 

func (f *FlagSet) Uint(name string, value uint, usage string) *uint

Uint defines a uint flag with specified name, default value, and usage string. The return value is the address of a uint variable that stores the value of the flag.

func (*FlagSet) Uint64 

func (f *FlagSet) Uint64(name string, value uint64, usage string) *uint64

Uint64 defines a uint64 flag with specified name, default value, and usage string. The return value is the address of a uint64 variable that stores the value of the flag.

func (*FlagSet) Uint64P 

func (f *FlagSet) Uint64P(name, shorthand string, value uint64, usage string) *uint64

Uint64P is like Uint64, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Uint64Var 

func (f *FlagSet) Uint64Var(p *uint64, name string, value uint64, usage string)

Uint64Var defines a uint64 flag with specified name, default value, and usage string. The argument p points to a uint64 variable in which to store the value of the flag.

func (*FlagSet) Uint64VarP 

func (f *FlagSet) Uint64VarP(p *uint64, name, shorthand string, value uint64, usage string)

Uint64VarP is like Uint64Var, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) UintP 

func (f *FlagSet) UintP(name, shorthand string, value uint, usage string) *uint

UintP is like Uint, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) UintVar 

func (f *FlagSet) UintVar(p *uint, name string, value uint, usage string)

UintVar defines a uint flag with specified name, default value, and usage string. The argument p points to a uint variable in which to store the value of the flag.

func (*FlagSet) UintVarP 

func (f *FlagSet) UintVarP(p *uint, name, shorthand string, value uint, usage string)

UintVarP is like UintVar, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Var 

func (f *FlagSet) Var(value Value, name string, usage string)

Var defines a flag with the specified name and usage string. The type and value of the flag are represented by the first argument, of type Value, which typically holds a user-defined implementation of Value. For instance, the caller could create a flag that turns a comma-separated string into a slice of strings by giving the slice the methods of Value; in particular, Set would decompose the comma-separated string into the slice.

func (*FlagSet) VarP 

func (f *FlagSet) VarP(value Value, name, shorthand, usage string)

VarP is like Var, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Visit 

func (f *FlagSet) Visit(fn func(*Flag))

Visit visits the flags in lexicographical order, calling fn for each. It visits only those flags that have been set.

func (*FlagSet) VisitAll 

func (f *FlagSet) VisitAll(fn func(*Flag))

VisitAll visits the flags in lexicographical order, calling fn for each. It visits all flags, even those not set.

type NormalizedName 

type NormalizedName string

NormalizedName is a flag name that has been normalized according to rules for the FlagSet (e.g. making '-' and '_' equivalent).

type Value 

type Value interface {
	String() string
	Set(string) error
	Type() string
}

Value is the interface to the dynamic value stored in a flag. (The default value is represented as a string.)

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