pflag: github.com/spf13/pflag Index | Examples | Files

package pflag

import "github.com/spf13/pflag"

Package pflag is a drop-in replacement for Go's flag package, implementing POSIX/GNU-style --flags.

pflag is compatible with the GNU extensions to the POSIX recommendations for command-line options. See http://www.gnu.org/software/libc/manual/html_node/Argument-Syntax.html

Usage:

pflag is a drop-in replacement of Go's native flag package. If you import pflag under the name "flag" then all code should continue to function with no changes.

import flag "github.com/spf13/pflag"

There is one exception to this: if you directly instantiate the Flag struct there is one more field "Shorthand" that you will need to set. Most code never instantiates this struct directly, and instead uses functions such as String(), BoolVar(), and Var(), and is therefore unaffected.

Define flags using flag.String(), Bool(), Int(), etc.

This declares an integer flag, -flagname, stored in the pointer ip, with type *int.

var ip = flag.Int("flagname", 1234, "help message for flagname")

If you like, you can bind the flag to a variable using the Var() functions.

var flagvar int
func init() {
	flag.IntVar(&flagvar, "flagname", 1234, "help message for flagname")
}

Or you can create custom flags that satisfy the Value interface (with pointer receivers) and couple them to flag parsing by

flag.Var(&flagVal, "name", "help message for flagname")

For such flags, the default value is just the initial value of the variable.

After all flags are defined, call

flag.Parse()

to parse the command line into the defined flags.

Flags may then be used directly. If you're using the flags themselves, they are all pointers; if you bind to variables, they're values.

fmt.Println("ip has value ", *ip)
fmt.Println("flagvar has value ", flagvar)

After parsing, the arguments after the flag are available as the slice flag.Args() or individually as flag.Arg(i). The arguments are indexed from 0 through flag.NArg()-1.

The pflag package also defines some new functions that are not in flag, that give one-letter shorthands for flags. You can use these by appending 'P' to the name of any function that defines a flag.

var ip = flag.IntP("flagname", "f", 1234, "help message")
var flagvar bool
func init() {
	flag.BoolVarP("boolname", "b", true, "help message")
}
flag.VarP(&flagVar, "varname", "v", 1234, "help message")

Shorthand letters can be used with single dashes on the command line. Boolean shorthand flags can be combined with other shorthand flags.

Command line flag syntax:

--flag    // boolean flags only
--flag=x

Unlike the flag package, a single dash before an option means something different than a double dash. Single dashes signify a series of shorthand letters for flags. All but the last shorthand letter must be boolean flags.

// boolean flags
-f
-abc
// non-boolean flags
-n 1234
-Ifile
// mixed
-abcs "hello"
-abcn1234

Flag parsing stops after the terminator "--". Unlike the flag package, flags can be interspersed with arguments anywhere on the command line before this terminator.

Integer flags accept 1234, 0664, 0x1234 and may be negative. Boolean flags (in their long form) accept 1, 0, t, f, true, false, TRUE, FALSE, True, False. Duration flags accept any input valid for time.ParseDuration.

The default set of command-line flags is controlled by top-level functions. The FlagSet type allows one to define independent sets of flags, such as to implement subcommands in a command-line interface. The methods of FlagSet are analogous to the top-level functions for the command-line flag set.

Index

Examples

Package Files

bool.go bool_slice.go bytes.go count.go duration.go duration_slice.go flag.go float32.go float64.go golangflag.go int.go int16.go int32.go int64.go int8.go int_slice.go ip.go ip_slice.go ipmask.go ipnet.go string.go string_array.go string_slice.go uint.go uint16.go uint32.go uint64.go uint8.go uint_slice.go

Variables

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

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

var ErrHelp = errors.New("pflag: help requested")

ErrHelp is the error returned if the flag -help is invoked but no such flag is defined.

var Usage = func() {
    fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
    PrintDefaults()
}

Usage prints to standard error a usage message documenting all defined command-line flags. The function is a variable that may be changed to point to a custom function. By default it prints a simple header and calls PrintDefaults; for details about the format of the output and how to control it, see the documentation for PrintDefaults.

func Arg Uses

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 Uses

func Args() []string

Args returns the non-flag command-line arguments.

func Bool Uses

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 Uses

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 BoolSlice Uses

func BoolSlice(name string, value []bool, usage string) *[]bool

BoolSlice 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 BoolSliceP Uses

func BoolSliceP(name, shorthand string, value []bool, usage string) *[]bool

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

func BoolSliceVar Uses

func BoolSliceVar(p *[]bool, name string, value []bool, usage string)

BoolSliceVar 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 BoolSliceVarP Uses

func BoolSliceVarP(p *[]bool, name, shorthand string, value []bool, usage string)

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

func BoolVar Uses

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 Uses

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 BytesHex Uses

func BytesHex(name string, value []byte, usage string) *[]byte

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

func BytesHexP Uses

func BytesHexP(name, shorthand string, value []byte, usage string) *[]byte

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

func BytesHexVar Uses

func BytesHexVar(p *[]byte, name string, value []byte, usage string)

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

func BytesHexVarP Uses

func BytesHexVarP(p *[]byte, name, shorthand string, value []byte, usage string)

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

func Count Uses

func Count(name string, usage string) *int

Count defines a count 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. A count flag will add 1 to its value evey time it is found on the command line

func CountP Uses

func CountP(name, shorthand string, usage string) *int

CountP is like Count only takes a shorthand for the flag name.

func CountVar Uses

func CountVar(p *int, name string, usage string)

CountVar like CountVar only the flag is placed on the CommandLine instead of a given flag set

func CountVarP Uses

func CountVarP(p *int, name, shorthand string, usage string)

CountVarP is like CountVar only take a shorthand for the flag name.

func Duration Uses

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 Uses

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 DurationSlice Uses

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

DurationSlice 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 DurationSliceP Uses

func DurationSliceP(name, shorthand string, value []time.Duration, usage string) *[]time.Duration

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

func DurationSliceVar Uses

func DurationSliceVar(p *[]time.Duration, name string, value []time.Duration, usage string)

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

func DurationSliceVarP Uses

func DurationSliceVarP(p *[]time.Duration, name, shorthand string, value []time.Duration, usage string)

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

func DurationVar Uses

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 Uses

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 Float32 Uses

func Float32(name string, value float32, usage string) *float32

Float32 defines a float32 flag with specified name, default value, and usage string. The return value is the address of a float32 variable that stores the value of the flag.

func Float32P Uses

func Float32P(name, shorthand string, value float32, usage string) *float32

Float32P is like Float32, but accepts a shorthand letter that can be used after a single dash.

func Float32Var Uses

func Float32Var(p *float32, name string, value float32, usage string)

Float32Var defines a float32 flag with specified name, default value, and usage string. The argument p points to a float32 variable in which to store the value of the flag.

func Float32VarP Uses

func Float32VarP(p *float32, name, shorthand string, value float32, usage string)

Float32VarP is like Float32Var, but accepts a shorthand letter that can be used after a single dash.

func Float64 Uses

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 Uses

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 Uses

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 Uses

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 IP Uses

func IP(name string, value net.IP, usage string) *net.IP

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

func IPMask Uses

func IPMask(name string, value net.IPMask, usage string) *net.IPMask

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

func IPMaskP Uses

func IPMaskP(name, shorthand string, value net.IPMask, usage string) *net.IPMask

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

func IPMaskVar Uses

func IPMaskVar(p *net.IPMask, name string, value net.IPMask, usage string)

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

func IPMaskVarP Uses

func IPMaskVarP(p *net.IPMask, name, shorthand string, value net.IPMask, usage string)

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

func IPNet Uses

func IPNet(name string, value net.IPNet, usage string) *net.IPNet

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

func IPNetP Uses

func IPNetP(name, shorthand string, value net.IPNet, usage string) *net.IPNet

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

func IPNetVar Uses

func IPNetVar(p *net.IPNet, name string, value net.IPNet, usage string)

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

func IPNetVarP Uses

func IPNetVarP(p *net.IPNet, name, shorthand string, value net.IPNet, usage string)

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

func IPP Uses

func IPP(name, shorthand string, value net.IP, usage string) *net.IP

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

func IPSlice Uses

func IPSlice(name string, value []net.IP, usage string) *[]net.IP

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

func IPSliceP Uses

func IPSliceP(name, shorthand string, value []net.IP, usage string) *[]net.IP

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

func IPSliceVar Uses

func IPSliceVar(p *[]net.IP, name string, value []net.IP, usage string)

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

func IPSliceVarP Uses

func IPSliceVarP(p *[]net.IP, name, shorthand string, value []net.IP, usage string)

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

func IPVar Uses

func IPVar(p *net.IP, name string, value net.IP, usage string)

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

func IPVarP Uses

func IPVarP(p *net.IP, name, shorthand string, value net.IP, usage string)

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

func Int Uses

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 Int16 Uses

func Int16(name string, value int16, usage string) *int16

Int16 defines an int16 flag with specified name, default value, and usage string. The return value is the address of an int16 variable that stores the value of the flag.

func Int16P Uses

func Int16P(name, shorthand string, value int16, usage string) *int16

Int16P is like Int16, but accepts a shorthand letter that can be used after a single dash.

func Int16Var Uses

func Int16Var(p *int16, name string, value int16, usage string)

Int16Var defines an int16 flag with specified name, default value, and usage string. The argument p points to an int16 variable in which to store the value of the flag.

func Int16VarP Uses

func Int16VarP(p *int16, name, shorthand string, value int16, usage string)

Int16VarP is like Int16Var, but accepts a shorthand letter that can be used after a single dash.

func Int32 Uses

func Int32(name string, value int32, usage string) *int32

Int32 defines an int32 flag with specified name, default value, and usage string. The return value is the address of an int32 variable that stores the value of the flag.

func Int32P Uses

func Int32P(name, shorthand string, value int32, usage string) *int32

Int32P is like Int32, but accepts a shorthand letter that can be used after a single dash.

func Int32Var Uses

func Int32Var(p *int32, name string, value int32, usage string)

Int32Var defines an int32 flag with specified name, default value, and usage string. The argument p points to an int32 variable in which to store the value of the flag.

func Int32VarP Uses

func Int32VarP(p *int32, name, shorthand string, value int32, usage string)

Int32VarP is like Int32Var, but accepts a shorthand letter that can be used after a single dash.

func Int64 Uses

func 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 Int64P Uses

func 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 Int64Var Uses

func 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 Int64VarP Uses

func 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 Int8 Uses

func Int8(name string, value int8, usage string) *int8

Int8 defines an int8 flag with specified name, default value, and usage string. The return value is the address of an int8 variable that stores the value of the flag.

func Int8P Uses

func Int8P(name, shorthand string, value int8, usage string) *int8

Int8P is like Int8, but accepts a shorthand letter that can be used after a single dash.

func Int8Var Uses

func Int8Var(p *int8, name string, value int8, usage string)

Int8Var defines an int8 flag with specified name, default value, and usage string. The argument p points to an int8 variable in which to store the value of the flag.

func Int8VarP Uses

func Int8VarP(p *int8, name, shorthand string, value int8, usage string)

Int8VarP is like Int8Var, but accepts a shorthand letter that can be used after a single dash.

func IntP Uses

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 IntSlice Uses

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

IntSlice defines a []int 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 IntSliceP Uses

func 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 IntSliceVar Uses

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

IntSliceVar defines a int[] 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 IntSliceVarP Uses

func 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 IntVar Uses

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 Uses

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 Uses

func NArg() int

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

func NFlag Uses

func NFlag() int

NFlag returns the number of command-line flags that have been set.

func Parse Uses

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 ParseAll Uses

func ParseAll(fn func(flag *Flag, value string) error)

ParseAll parses the command-line flags from os.Args[1:] and called fn for each. The arguments for fn are flag and value. Must be called after all flags are defined and before flags are accessed by the program.

func ParseIPv4Mask Uses

func ParseIPv4Mask(s string) net.IPMask

ParseIPv4Mask written in IP form (e.g. 255.255.255.0). This function should really belong to the net package.

func Parsed Uses

func Parsed() bool

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

func PrintDefaults Uses

func PrintDefaults()

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

func Set Uses

func Set(name, value string) error

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

func SetInterspersed Uses

func SetInterspersed(interspersed bool)

SetInterspersed sets whether to support interspersed option/non-option arguments.

func String Uses

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 StringArray Uses

func StringArray(name string, value []string, usage string) *[]string

StringArray 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. The value of each argument will not try to be separated by comma. Use a StringSlice for that.

func StringArrayP Uses

func StringArrayP(name, shorthand string, value []string, usage string) *[]string

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

func StringArrayVar Uses

func StringArrayVar(p *[]string, name string, value []string, usage string)

StringArrayVar 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. The value of each argument will not try to be separated by comma. Use a StringSlice for that.

func StringArrayVarP Uses

func StringArrayVarP(p *[]string, name, shorthand string, value []string, usage string)

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

func StringP Uses

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 StringSlice Uses

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

StringSlice 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. Compared to StringArray flags, StringSlice flags take comma-separated value as arguments and split them accordingly. For example:

--ss="v1,v2" -ss="v3"

will result in

[]string{"v1", "v2", "v3"}

func StringSliceP Uses

func 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 StringSliceVar Uses

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

StringSliceVar 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. Compared to StringArray flags, StringSlice flags take comma-separated value as arguments and split them accordingly. For example:

--ss="v1,v2" -ss="v3"

will result in

[]string{"v1", "v2", "v3"}

func StringSliceVarP Uses

func 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 StringVar Uses

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 Uses

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 Uint Uses

func 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 Uint16 Uses

func Uint16(name string, value uint16, usage string) *uint16

Uint16 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 Uint16P Uses

func Uint16P(name, shorthand string, value uint16, usage string) *uint16

Uint16P is like Uint16, but accepts a shorthand letter that can be used after a single dash.

func Uint16Var Uses

func Uint16Var(p *uint16, name string, value uint16, usage string)

Uint16Var 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 Uint16VarP Uses

func Uint16VarP(p *uint16, name, shorthand string, value uint16, usage string)

Uint16VarP is like Uint16Var, but accepts a shorthand letter that can be used after a single dash.

func Uint32 Uses

func Uint32(name string, value uint32, usage string) *uint32

Uint32 defines a uint32 flag with specified name, default value, and usage string. The return value is the address of a uint32 variable that stores the value of the flag.

func Uint32P Uses

func Uint32P(name, shorthand string, value uint32, usage string) *uint32

Uint32P is like Uint32, but accepts a shorthand letter that can be used after a single dash.

func Uint32Var Uses

func Uint32Var(p *uint32, name string, value uint32, usage string)

Uint32Var defines a uint32 flag with specified name, default value, and usage string. The argument p points to a uint32 variable in which to store the value of the flag.

func Uint32VarP Uses

func Uint32VarP(p *uint32, name, shorthand string, value uint32, usage string)

Uint32VarP is like Uint32Var, but accepts a shorthand letter that can be used after a single dash.

func Uint64 Uses

func 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 Uint64P Uses

func 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 Uint64Var Uses

func 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 Uint64VarP Uses

func 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 Uint8 Uses

func Uint8(name string, value uint8, usage string) *uint8

Uint8 defines a uint8 flag with specified name, default value, and usage string. The return value is the address of a uint8 variable that stores the value of the flag.

func Uint8P Uses

func Uint8P(name, shorthand string, value uint8, usage string) *uint8

Uint8P is like Uint8, but accepts a shorthand letter that can be used after a single dash.

func Uint8Var Uses

func Uint8Var(p *uint8, name string, value uint8, usage string)

Uint8Var defines a uint8 flag with specified name, default value, and usage string. The argument p points to a uint8 variable in which to store the value of the flag.

func Uint8VarP Uses

func Uint8VarP(p *uint8, name, shorthand string, value uint8, usage string)

Uint8VarP is like Uint8Var, but accepts a shorthand letter that can be used after a single dash.

func UintP Uses

func 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 UintSlice Uses

func UintSlice(name string, value []uint, usage string) *[]uint

UintSlice 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 UintSliceP Uses

func UintSliceP(name, shorthand string, value []uint, usage string) *[]uint

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

func UintSliceVar Uses

func UintSliceVar(p *[]uint, name string, value []uint, usage string)

UintSliceVar 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 UintSliceVarP Uses

func UintSliceVarP(p *[]uint, name, shorthand string, value []uint, usage string)

UintSliceVarP is like the UintSliceVar, but accepts a shorthand letter that can be used after a single dash.

func UintVar Uses

func 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 UintVarP Uses

func 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 UnquoteUsage Uses

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 Var Uses

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. 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 VarP Uses

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 Uses

func Visit(fn func(*Flag))

Visit visits the command-line flags in lexicographical order or in primordial order if f.SortFlags is false, calling fn for each. It visits only those flags that have been set.

func VisitAll Uses

func VisitAll(fn func(*Flag))

VisitAll visits the command-line flags in lexicographical order or in primordial order if f.SortFlags is false, calling fn for each. It visits all flags, even those not set.

type ErrorHandling Uses

type ErrorHandling int

ErrorHandling defines how to handle flag parsing errors.

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 Uses

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)
    NoOptDefVal         string              // default value (as text); if the flag is on the command line without any options
    Deprecated          string              // If this flag is deprecated, this string is the new or now thing to use
    Hidden              bool                // used by cobra.Command to allow flags to be hidden from help/usage text
    ShorthandDeprecated string              // If the shorthand of 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
}

A Flag represents the state of a flag.

func Lookup Uses

func Lookup(name string) *Flag

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

func PFlagFromGoFlag Uses

func PFlagFromGoFlag(goflag *goflag.Flag) *Flag

PFlagFromGoFlag will return a *pflag.Flag given a *flag.Flag If the *flag.Flag.Name was a single character (ex: `v`) it will be accessiblei with both `-v` and `--v` in flags. If the golang flag was more than a single character (ex: `verbose`) it will only be accessible via `--verbose`

func ShorthandLookup Uses

func ShorthandLookup(name string) *Flag

ShorthandLookup returns the Flag structure of the short handed flag, returning nil if none exists.

Code:

name := "verbose"
short := name[:1]

pflag.BoolP(name, short, false, "verbose output")

// len(short) must be == 1
flag := pflag.ShorthandLookup(short)

fmt.Println(flag.Name)

type FlagSet Uses

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()

    // SortFlags is used to indicate, if user wants to have sorted flags in
    // help/usage messages.
    SortFlags bool

    // ParseErrorsWhitelist is used to configure a whitelist of errors
    ParseErrorsWhitelist ParseErrorsWhitelist
    // contains filtered or unexported fields
}

A FlagSet represents a set of defined flags.

func NewFlagSet Uses

func NewFlagSet(name string, errorHandling ErrorHandling) *FlagSet

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

func (*FlagSet) AddFlag Uses

func (f *FlagSet) AddFlag(flag *Flag)

AddFlag will add the flag to the FlagSet

func (*FlagSet) AddFlagSet Uses

func (f *FlagSet) AddFlagSet(newSet *FlagSet)

AddFlagSet adds one FlagSet to another. If a flag is already present in f the flag from newSet will be ignored.

func (*FlagSet) AddGoFlag Uses

func (f *FlagSet) AddGoFlag(goflag *goflag.Flag)

AddGoFlag will add the given *flag.Flag to the pflag.FlagSet

func (*FlagSet) AddGoFlagSet Uses

func (f *FlagSet) AddGoFlagSet(newSet *goflag.FlagSet)

AddGoFlagSet will add the given *flag.FlagSet to the pflag.FlagSet

func (*FlagSet) Arg Uses

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 Uses

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

Args returns the non-flag arguments.

func (*FlagSet) ArgsLenAtDash Uses

func (f *FlagSet) ArgsLenAtDash() int

ArgsLenAtDash will return the length of f.Args at the moment when a -- was found during arg parsing. This allows your program to know which args were before the -- and which came after.

func (*FlagSet) Bool Uses

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 Uses

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) BoolSlice Uses

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

BoolSlice 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) BoolSliceP Uses

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

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

func (*FlagSet) BoolSliceVar Uses

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

BoolSliceVar defines a boolSlice 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) BoolSliceVarP Uses

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

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

func (*FlagSet) BoolVar Uses

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 Uses

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) BytesHex Uses

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

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

func (*FlagSet) BytesHexP Uses

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

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

func (*FlagSet) BytesHexVar Uses

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

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

func (*FlagSet) BytesHexVarP Uses

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

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

func (*FlagSet) Changed Uses

func (f *FlagSet) Changed(name string) bool

Changed returns true if the flag was explicitly set during Parse() and false otherwise

func (*FlagSet) Count Uses

func (f *FlagSet) Count(name string, usage string) *int

Count defines a count 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. A count flag will add 1 to its value evey time it is found on the command line

func (*FlagSet) CountP Uses

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

CountP is like Count only takes a shorthand for the flag name.

func (*FlagSet) CountVar Uses

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

CountVar defines a count 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. A count flag will add 1 to its value evey time it is found on the command line

func (*FlagSet) CountVarP Uses

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

CountVarP is like CountVar only take a shorthand for the flag name.

func (*FlagSet) Duration Uses

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 Uses

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) DurationSlice Uses

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

DurationSlice 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) DurationSliceP Uses

func (f *FlagSet) DurationSliceP(name, shorthand string, value []time.Duration, usage string) *[]time.Duration

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

func (*FlagSet) DurationSliceVar Uses

func (f *FlagSet) DurationSliceVar(p *[]time.Duration, name string, value []time.Duration, usage string)

DurationSliceVar defines a durationSlice 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) DurationSliceVarP Uses

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

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

func (*FlagSet) DurationVar Uses

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 Uses

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) FlagUsages Uses

func (f *FlagSet) FlagUsages() string

FlagUsages returns a string containing the usage information for all flags in the FlagSet

func (*FlagSet) FlagUsagesWrapped Uses

func (f *FlagSet) FlagUsagesWrapped(cols int) string

FlagUsagesWrapped returns a string containing the usage information for all flags in the FlagSet. Wrapped to `cols` columns (0 for no wrapping)

func (*FlagSet) Float32 Uses

func (f *FlagSet) Float32(name string, value float32, usage string) *float32

Float32 defines a float32 flag with specified name, default value, and usage string. The return value is the address of a float32 variable that stores the value of the flag.

func (*FlagSet) Float32P Uses

func (f *FlagSet) Float32P(name, shorthand string, value float32, usage string) *float32

Float32P is like Float32, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Float32Var Uses

func (f *FlagSet) Float32Var(p *float32, name string, value float32, usage string)

Float32Var defines a float32 flag with specified name, default value, and usage string. The argument p points to a float32 variable in which to store the value of the flag.

func (*FlagSet) Float32VarP Uses

func (f *FlagSet) Float32VarP(p *float32, name, shorthand string, value float32, usage string)

Float32VarP is like Float32Var, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Float64 Uses

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 Uses

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 Uses

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 Uses

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) GetBool Uses

func (f *FlagSet) GetBool(name string) (bool, error)

GetBool return the bool value of a flag with the given name

func (*FlagSet) GetBoolSlice Uses

func (f *FlagSet) GetBoolSlice(name string) ([]bool, error)

GetBoolSlice returns the []bool value of a flag with the given name.

func (*FlagSet) GetBytesHex Uses

func (f *FlagSet) GetBytesHex(name string) ([]byte, error)

GetBytesHex return the []byte value of a flag with the given name

func (*FlagSet) GetCount Uses

func (f *FlagSet) GetCount(name string) (int, error)

GetCount return the int value of a flag with the given name

func (*FlagSet) GetDuration Uses

func (f *FlagSet) GetDuration(name string) (time.Duration, error)

GetDuration return the duration value of a flag with the given name

func (*FlagSet) GetDurationSlice Uses

func (f *FlagSet) GetDurationSlice(name string) ([]time.Duration, error)

GetDurationSlice returns the []time.Duration value of a flag with the given name

func (*FlagSet) GetFloat32 Uses

func (f *FlagSet) GetFloat32(name string) (float32, error)

GetFloat32 return the float32 value of a flag with the given name

func (*FlagSet) GetFloat64 Uses

func (f *FlagSet) GetFloat64(name string) (float64, error)

GetFloat64 return the float64 value of a flag with the given name

func (*FlagSet) GetIP Uses

func (f *FlagSet) GetIP(name string) (net.IP, error)

GetIP return the net.IP value of a flag with the given name

func (*FlagSet) GetIPNet Uses

func (f *FlagSet) GetIPNet(name string) (net.IPNet, error)

GetIPNet return the net.IPNet value of a flag with the given name

func (*FlagSet) GetIPSlice Uses

func (f *FlagSet) GetIPSlice(name string) ([]net.IP, error)

GetIPSlice returns the []net.IP value of a flag with the given name

func (*FlagSet) GetIPv4Mask Uses

func (f *FlagSet) GetIPv4Mask(name string) (net.IPMask, error)

GetIPv4Mask return the net.IPv4Mask value of a flag with the given name

func (*FlagSet) GetInt Uses

func (f *FlagSet) GetInt(name string) (int, error)

GetInt return the int value of a flag with the given name

func (*FlagSet) GetInt16 Uses

func (f *FlagSet) GetInt16(name string) (int16, error)

GetInt16 returns the int16 value of a flag with the given name

func (*FlagSet) GetInt32 Uses

func (f *FlagSet) GetInt32(name string) (int32, error)

GetInt32 return the int32 value of a flag with the given name

func (*FlagSet) GetInt64 Uses

func (f *FlagSet) GetInt64(name string) (int64, error)

GetInt64 return the int64 value of a flag with the given name

func (*FlagSet) GetInt8 Uses

func (f *FlagSet) GetInt8(name string) (int8, error)

GetInt8 return the int8 value of a flag with the given name

func (*FlagSet) GetIntSlice Uses

func (f *FlagSet) GetIntSlice(name string) ([]int, error)

GetIntSlice return the []int value of a flag with the given name

func (*FlagSet) GetNormalizeFunc Uses

func (f *FlagSet) GetNormalizeFunc() func(f *FlagSet, name string) NormalizedName

GetNormalizeFunc returns the previously set NormalizeFunc of a function which does no translation, if not set previously.

func (*FlagSet) GetString Uses

func (f *FlagSet) GetString(name string) (string, error)

GetString return the string value of a flag with the given name

func (*FlagSet) GetStringArray Uses

func (f *FlagSet) GetStringArray(name string) ([]string, error)

GetStringArray return the []string value of a flag with the given name

func (*FlagSet) GetStringSlice Uses

func (f *FlagSet) GetStringSlice(name string) ([]string, error)

GetStringSlice return the []string value of a flag with the given name

func (*FlagSet) GetUint Uses

func (f *FlagSet) GetUint(name string) (uint, error)

GetUint return the uint value of a flag with the given name

func (*FlagSet) GetUint16 Uses

func (f *FlagSet) GetUint16(name string) (uint16, error)

GetUint16 return the uint16 value of a flag with the given name

func (*FlagSet) GetUint32 Uses

func (f *FlagSet) GetUint32(name string) (uint32, error)

GetUint32 return the uint32 value of a flag with the given name

func (*FlagSet) GetUint64 Uses

func (f *FlagSet) GetUint64(name string) (uint64, error)

GetUint64 return the uint64 value of a flag with the given name

func (*FlagSet) GetUint8 Uses

func (f *FlagSet) GetUint8(name string) (uint8, error)

GetUint8 return the uint8 value of a flag with the given name

func (*FlagSet) GetUintSlice Uses

func (f *FlagSet) GetUintSlice(name string) ([]uint, error)

GetUintSlice returns the []uint value of a flag with the given name.

func (*FlagSet) HasAvailableFlags Uses

func (f *FlagSet) HasAvailableFlags() bool

HasAvailableFlags returns a bool to indicate if the FlagSet has any flags that are not hidden.

func (*FlagSet) HasFlags Uses

func (f *FlagSet) HasFlags() bool

HasFlags returns a bool to indicate if the FlagSet has any flags defined.

func (*FlagSet) IP Uses

func (f *FlagSet) IP(name string, value net.IP, usage string) *net.IP

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

func (*FlagSet) IPMask Uses

func (f *FlagSet) IPMask(name string, value net.IPMask, usage string) *net.IPMask

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

func (*FlagSet) IPMaskP Uses

func (f *FlagSet) IPMaskP(name, shorthand string, value net.IPMask, usage string) *net.IPMask

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

func (*FlagSet) IPMaskVar Uses

func (f *FlagSet) IPMaskVar(p *net.IPMask, name string, value net.IPMask, usage string)

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

func (*FlagSet) IPMaskVarP Uses

func (f *FlagSet) IPMaskVarP(p *net.IPMask, name, shorthand string, value net.IPMask, usage string)

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

func (*FlagSet) IPNet Uses

func (f *FlagSet) IPNet(name string, value net.IPNet, usage string) *net.IPNet

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

func (*FlagSet) IPNetP Uses

func (f *FlagSet) IPNetP(name, shorthand string, value net.IPNet, usage string) *net.IPNet

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

func (*FlagSet) IPNetVar Uses

func (f *FlagSet) IPNetVar(p *net.IPNet, name string, value net.IPNet, usage string)

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

func (*FlagSet) IPNetVarP Uses

func (f *FlagSet) IPNetVarP(p *net.IPNet, name, shorthand string, value net.IPNet, usage string)

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

func (*FlagSet) IPP Uses

func (f *FlagSet) IPP(name, shorthand string, value net.IP, usage string) *net.IP

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

func (*FlagSet) IPSlice Uses

func (f *FlagSet) IPSlice(name string, value []net.IP, usage string) *[]net.IP

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

func (*FlagSet) IPSliceP Uses

func (f *FlagSet) IPSliceP(name, shorthand string, value []net.IP, usage string) *[]net.IP

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

func (*FlagSet) IPSliceVar Uses

func (f *FlagSet) IPSliceVar(p *[]net.IP, name string, value []net.IP, usage string)

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

func (*FlagSet) IPSliceVarP Uses

func (f *FlagSet) IPSliceVarP(p *[]net.IP, name, shorthand string, value []net.IP, usage string)

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

func (*FlagSet) IPVar Uses

func (f *FlagSet) IPVar(p *net.IP, name string, value net.IP, usage string)

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

func (*FlagSet) IPVarP Uses

func (f *FlagSet) IPVarP(p *net.IP, name, shorthand string, value net.IP, usage string)

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

func (*FlagSet) Init Uses

func (f *FlagSet) Init(name string, errorHandling ErrorHandling)

Init sets the name and error handling property for a flag set. By default, the zero FlagSet uses an empty name and the ContinueOnError error handling policy.

func (*FlagSet) Int Uses

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) Int16 Uses

func (f *FlagSet) Int16(name string, value int16, usage string) *int16

Int16 defines an int16 flag with specified name, default value, and usage string. The return value is the address of an int16 variable that stores the value of the flag.

func (*FlagSet) Int16P Uses

func (f *FlagSet) Int16P(name, shorthand string, value int16, usage string) *int16

Int16P is like Int16, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Int16Var Uses

func (f *FlagSet) Int16Var(p *int16, name string, value int16, usage string)

Int16Var defines an int16 flag with specified name, default value, and usage string. The argument p points to an int16 variable in which to store the value of the flag.

func (*FlagSet) Int16VarP Uses

func (f *FlagSet) Int16VarP(p *int16, name, shorthand string, value int16, usage string)

Int16VarP is like Int16Var, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Int32 Uses

func (f *FlagSet) Int32(name string, value int32, usage string) *int32

Int32 defines an int32 flag with specified name, default value, and usage string. The return value is the address of an int32 variable that stores the value of the flag.

func (*FlagSet) Int32P Uses

func (f *FlagSet) Int32P(name, shorthand string, value int32, usage string) *int32

Int32P is like Int32, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Int32Var Uses

func (f *FlagSet) Int32Var(p *int32, name string, value int32, usage string)

Int32Var defines an int32 flag with specified name, default value, and usage string. The argument p points to an int32 variable in which to store the value of the flag.

func (*FlagSet) Int32VarP Uses

func (f *FlagSet) Int32VarP(p *int32, name, shorthand string, value int32, usage string)

Int32VarP is like Int32Var, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Int64 Uses

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 Uses

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 Uses

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 Uses

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) Int8 Uses

func (f *FlagSet) Int8(name string, value int8, usage string) *int8

Int8 defines an int8 flag with specified name, default value, and usage string. The return value is the address of an int8 variable that stores the value of the flag.

func (*FlagSet) Int8P Uses

func (f *FlagSet) Int8P(name, shorthand string, value int8, usage string) *int8

Int8P is like Int8, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Int8Var Uses

func (f *FlagSet) Int8Var(p *int8, name string, value int8, usage string)

Int8Var defines an int8 flag with specified name, default value, and usage string. The argument p points to an int8 variable in which to store the value of the flag.

func (*FlagSet) Int8VarP Uses

func (f *FlagSet) Int8VarP(p *int8, name, shorthand string, value int8, usage string)

Int8VarP is like Int8Var, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) IntP Uses

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 Uses

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

IntSlice defines a []int 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 Uses

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 Uses

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

IntSliceVar defines a intSlice 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 Uses

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 Uses

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 Uses

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 Uses

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

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

func (*FlagSet) MarkDeprecated Uses

func (f *FlagSet) MarkDeprecated(name string, usageMessage string) error

MarkDeprecated indicated that a flag is deprecated in your program. It will continue to function but will not show up in help or usage messages. Using this flag will also print the given usageMessage.

func (*FlagSet) MarkHidden Uses

func (f *FlagSet) MarkHidden(name string) error

MarkHidden sets a flag to 'hidden' in your program. It will continue to function but will not show up in help or usage messages.

func (*FlagSet) MarkShorthandDeprecated Uses

func (f *FlagSet) MarkShorthandDeprecated(name string, usageMessage string) error

MarkShorthandDeprecated will mark the shorthand of a flag deprecated in your program. It will continue to function but will not show up in help or usage messages. Using this flag will also print the given usageMessage.

func (*FlagSet) NArg Uses

func (f *FlagSet) NArg() int

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

func (*FlagSet) NFlag Uses

func (f *FlagSet) NFlag() int

NFlag returns the number of flags that have been set.

func (*FlagSet) Parse Uses

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) ParseAll Uses

func (f *FlagSet) ParseAll(arguments []string, fn func(flag *Flag, value string) error) error

ParseAll parses flag definitions from the argument list, which should not include the command name. The arguments for fn are flag and value. 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 Uses

func (f *FlagSet) Parsed() bool

Parsed reports whether f.Parse has been called.

func (*FlagSet) PrintDefaults Uses

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 Uses

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

Set sets the value of the named flag.

func (*FlagSet) SetAnnotation Uses

func (f *FlagSet) SetAnnotation(name, key string, values []string) error

SetAnnotation allows one to set arbitrary annotations on a flag in the FlagSet. This is sometimes used by spf13/cobra programs which want to generate additional bash completion information.

func (*FlagSet) SetInterspersed Uses

func (f *FlagSet) SetInterspersed(interspersed bool)

SetInterspersed sets whether to support interspersed option/non-option arguments.

func (*FlagSet) SetNormalizeFunc Uses

func (f *FlagSet) SetNormalizeFunc(n func(f *FlagSet, name string) NormalizedName)

SetNormalizeFunc allows you to add a function which can translate flag names. Flags added to the FlagSet will be translated and then when anything tries to look up the flag that will also be translated. So it would be possible to create a flag named "getURL" and have it translated to "geturl". A user could then pass "--getUrl" which may also be translated to "geturl" and everything will work.

func (*FlagSet) SetOutput Uses

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) ShorthandLookup Uses

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

ShorthandLookup returns the Flag structure of the short handed flag, returning nil if none exists. It panics, if len(name) > 1.

Code:

name := "verbose"
short := name[:1]

fs := pflag.NewFlagSet("Example", pflag.ContinueOnError)
fs.BoolP(name, short, false, "verbose output")

// len(short) must be == 1
flag := fs.ShorthandLookup(short)

fmt.Println(flag.Name)

func (*FlagSet) String Uses

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) StringArray Uses

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

StringArray 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. The value of each argument will not try to be separated by comma. Use a StringSlice for that.

func (*FlagSet) StringArrayP Uses

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

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

func (*FlagSet) StringArrayVar Uses

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

StringArrayVar 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 values of the multiple flags. The value of each argument will not try to be separated by comma. Use a StringSlice for that.

func (*FlagSet) StringArrayVarP Uses

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

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

func (*FlagSet) StringP Uses

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 Uses

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

StringSlice 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. Compared to StringArray flags, StringSlice flags take comma-separated value as arguments and split them accordingly. For example:

--ss="v1,v2" -ss="v3"

will result in

[]string{"v1", "v2", "v3"}

func (*FlagSet) StringSliceP Uses

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 Uses

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

StringSliceVar 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. Compared to StringArray flags, StringSlice flags take comma-separated value as arguments and split them accordingly. For example:

--ss="v1,v2" -ss="v3"

will result in

[]string{"v1", "v2", "v3"}

func (*FlagSet) StringSliceVarP Uses

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 Uses

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 Uses

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 Uses

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) Uint16 Uses

func (f *FlagSet) Uint16(name string, value uint16, usage string) *uint16

Uint16 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) Uint16P Uses

func (f *FlagSet) Uint16P(name, shorthand string, value uint16, usage string) *uint16

Uint16P is like Uint16, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Uint16Var Uses

func (f *FlagSet) Uint16Var(p *uint16, name string, value uint16, usage string)

Uint16Var 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) Uint16VarP Uses

func (f *FlagSet) Uint16VarP(p *uint16, name, shorthand string, value uint16, usage string)

Uint16VarP is like Uint16Var, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Uint32 Uses

func (f *FlagSet) Uint32(name string, value uint32, usage string) *uint32

Uint32 defines a uint32 flag with specified name, default value, and usage string. The return value is the address of a uint32 variable that stores the value of the flag.

func (*FlagSet) Uint32P Uses

func (f *FlagSet) Uint32P(name, shorthand string, value uint32, usage string) *uint32

Uint32P is like Uint32, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Uint32Var Uses

func (f *FlagSet) Uint32Var(p *uint32, name string, value uint32, usage string)

Uint32Var defines a uint32 flag with specified name, default value, and usage string. The argument p points to a uint32 variable in which to store the value of the flag.

func (*FlagSet) Uint32VarP Uses

func (f *FlagSet) Uint32VarP(p *uint32, name, shorthand string, value uint32, usage string)

Uint32VarP is like Uint32Var, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Uint64 Uses

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 Uses

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 Uses

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 Uses

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) Uint8 Uses

func (f *FlagSet) Uint8(name string, value uint8, usage string) *uint8

Uint8 defines a uint8 flag with specified name, default value, and usage string. The return value is the address of a uint8 variable that stores the value of the flag.

func (*FlagSet) Uint8P Uses

func (f *FlagSet) Uint8P(name, shorthand string, value uint8, usage string) *uint8

Uint8P is like Uint8, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) Uint8Var Uses

func (f *FlagSet) Uint8Var(p *uint8, name string, value uint8, usage string)

Uint8Var defines a uint8 flag with specified name, default value, and usage string. The argument p points to a uint8 variable in which to store the value of the flag.

func (*FlagSet) Uint8VarP Uses

func (f *FlagSet) Uint8VarP(p *uint8, name, shorthand string, value uint8, usage string)

Uint8VarP is like Uint8Var, but accepts a shorthand letter that can be used after a single dash.

func (*FlagSet) UintP Uses

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) UintSlice Uses

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

UintSlice 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) UintSliceP Uses

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

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

func (*FlagSet) UintSliceVar Uses

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

UintSliceVar defines a uintSlice 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) UintSliceVarP Uses

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

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

func (*FlagSet) UintVar Uses

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 Uses

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 Uses

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 Uses

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) VarPF Uses

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

VarPF is like VarP, but returns the flag created

func (*FlagSet) Visit Uses

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

Visit visits the flags in lexicographical order or in primordial order if f.SortFlags is false, calling fn for each. It visits only those flags that have been set.

func (*FlagSet) VisitAll Uses

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

VisitAll visits the flags in lexicographical order or in primordial order if f.SortFlags is false, calling fn for each. It visits all flags, even those not set.

type NormalizedName Uses

type NormalizedName string

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

type ParseErrorsWhitelist Uses

type ParseErrorsWhitelist struct {
    // UnknownFlags will ignore unknown flags errors and continue parsing rest of the flags
    UnknownFlags bool
}

ParseErrorsWhitelist defines the parsing errors that can be ignored

type Value Uses

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.)

Package pflag imports 14 packages (graph) and is imported by 5533 packages. Updated 2018-07-15. Refresh now. Tools for package owners.