package standard library
Version: go1.19 Latest Latest

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Published: Aug 2, 2022 License: BSD-3-Clause Imports: 4 Imported by: 0



Package cmdflag handles flag processing common to several go tools.



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var ErrFlagTerminator = errors.New("flag terminator")

ErrFlagTerminator indicates the distinguished token "--", which causes the flag package to treat all subsequent arguments as non-flags.


func ParseOne added in go1.15

func ParseOne(fs *flag.FlagSet, args []string) (f *flag.Flag, remainingArgs []string, err error)

ParseOne sees if args[0] is present in the given flag set and if so, sets its value and returns the flag along with the remaining (unused) arguments.

ParseOne always returns either a non-nil Flag or a non-nil error, and always consumes at least one argument (even on error).

Unlike (*flag.FlagSet).Parse, ParseOne does not log its own errors.


type FlagNotDefinedError added in go1.15

type FlagNotDefinedError struct {
	RawArg   string // the original argument, like --foo or -foo=value
	Name     string
	HasValue bool   // is this the -foo=value or --foo=value form?
	Value    string // only provided if HasValue is true

A FlagNotDefinedError indicates a flag-like argument that does not correspond to any registered flag in a FlagSet.

func (FlagNotDefinedError) Error added in go1.15

func (e FlagNotDefinedError) Error() string

type NonFlagError added in go1.15

type NonFlagError struct {
	RawArg string

A NonFlagError indicates an argument that is not a syntactically-valid flag.

func (NonFlagError) Error added in go1.15

func (e NonFlagError) Error() string

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