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args.go

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package cli

import "errors"

var (

argsRangeErr = errors.New("index out of range")

)

type Args interface {

// Get returns the nth argument, or else a blank string

Get(n int) string

// First returns the first argument, or else a blank string

First() string

// Tail returns the rest of the arguments (not the first one)

// or else an empty string slice

Tail() []string

// Len returns the length of the wrapped slice

Len() int

// Present checks if there are any arguments present

Present() bool

// Slice returns a copy of the internal slice

Slice() []string

}

type args []string

func (a *args) Get(n int) string {

if len(*a) > n {

return (*a)[n]

}

return ""

}

func (a *args) First() string {

return a.Get(0)

}

func (a *args) Tail() []string {

if a.Len() >= 2 {

tail := []string((*a)[1:])

ret := make([]string, len(tail))

copy(ret, tail)

return ret

}

return []string{}

}

func (a *args) Len() int {

return len(*a)

}

func (a *args) Present() bool {

return a.Len() != 0

}

func (a *args) Slice() []string {

ret := make([]string, len(*a))

copy(ret, []string(*a))

return ret

}