Why Go
- Case Studies
  
  Common problems companies solve with Go
- Use Cases
  
  Stories about how and why companies use Go
- Security Policy
  
  How Go can help keep you secure by default
Learn
Docs
- Effective Go
  
  Tips for writing clear, performant, and idiomatic Go code
- Go User Manual
  
  A complete introduction to building software with Go
- Standard library
  
  Reference documentation for Go's standard library
- Release Notes
  
  Learn what's new in each Go release
Packages
Community
- Recorded Talks
  
  Videos from prior events
- Meetups
  
  Meet other local Go developers
- Conferences
  
  Learn and network with Go developers from around the world
- Go blog
  
  The Go project's official blog.
- Go project
  
  Get help and stay informed from Go
- Get connected

flag

package module

Go to main page

Versions in this module

v0

v0.0.19

Aug 31, 2022

Changes in this version

type Flag

+ func Func(name string, description string, usage string, fn func(string) error) Flag

+ func TextVar(name string, p encoding.TextUnmarshaler, value encoding.TextMarshaler, ...) Flag

v0.0.18

Apr 29, 2022

v0.0.17

Feb 16, 2022

v0.0.16

Jan 6, 2021

Changes in this version

type Flag

+ func StringNoDefault(name string, s *string, description string, usage string) Flag

v0.0.15

Dec 22, 2020

v0.0.14

Dec 18, 2020

Changes in this version

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

+ func Add(flags ...Flag)

+ func AddSet(s Set)

+ func AddSets(S ...Set)

+ func AddressEnvUsage(f string, env string) string

+ func Arg(i int) string

+ func Args() []string

+ func NArg() int

+ func Parse()

+ func ParseWithErr() error

+ func SetGlobalFooter(s string)

+ func SetGlobalHeader(s string)

+ func SetName(name string)

+ func SetUsageFooter(s string)

+ func SetUsageHeader(s string)

+ func SetValidate(f func() error)

+ func Usage()

+ type BasicSet struct

+ func NewBasicSet(name string, flags ...Flag) *BasicSet

+ func (S *BasicSet) Add(f ...Flag)

+ func (S *BasicSet) Flags() []Flag

+ func (S *BasicSet) Name() string

+ func (S *BasicSet) SetUsageFooter(s string)

+ func (S *BasicSet) SetUsageHeader(s string)

+ func (S *BasicSet) SetValidate(f func() error)

+ func (S *BasicSet) UsageFooter() string

+ func (S *BasicSet) UsageHeader() string

+ func (S *BasicSet) Validate() error

+ type Flag interface

+ Description func() string

+ Name func() string

+ Parse func(string) error

+ Usage func() string

+ func Address(name string, addr **address.Address, defaultAddr *address.Address, ...) Flag

+ func Bool(name string, b *bool, def bool, description string, usage string) Flag

+ func Duration(name string, d *time.Duration, def time.Duration, description string, ...) Flag

+ func Int(name string, n *int, def int, description string, usage string) Flag

+ func Path(name string, s *string, def string, description string, usage string) Flag

+ func String(name string, s *string, def string, description string, usage string) Flag

+ type Set interface

+ Flags func() []Flag

+ Name func() string

+ UsageFooter func() string

+ UsageHeader func() string

+ Validate func() error

+ func Merge(name string, S ...Set) Set