package appargs

import "github.com/Microsoft/hcsshim/internal/appargs"

Package appargs provides argument validation routines for use with github.com/urfave/cli.

Index ¶

• Variables
• func NonEmptyString(args []string) int
• func String(args []string) int
• func Validate(vs ...Validator) cli.BeforeFunc
• type Validator
• func Int(base int, min int, max int) Validator
• func Optional(v Validator) Validator
• func Rest(v Validator) Validator

Variables ¶

var ErrInvalidUsage = errors.New("invalid command usage")

ErrInvalidUsage is returned when there is a validation error.

Functions ¶

func NonEmptyString ¶

func NonEmptyString(args []string) int

NonEmptyString is a validator for non-empty strings.

func String ¶

func String(args []string) int

String is a validator for strings.

func Validate ¶

func Validate(vs ...Validator) cli.BeforeFunc

Validate can be used as a command's Before function to validate the arguments to the command.

Types ¶

type Validator ¶

type Validator = func([]string) int

Validator is an argument validator function. It returns the number of arguments consumed or -1 on error.

func Int ¶

func Int(base int, min int, max int) Validator

Int returns a validator for integers.

func Optional ¶

func Optional(v Validator) Validator

Optional returns a validator that treats an argument as optional.

func Rest ¶

func Rest(v Validator) Validator

Rest returns a validator that validates each of the remaining arguments.

Source Files ¶

appargs.go