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61 lines
1.2 KiB
61 lines
1.2 KiB
8 years ago
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package cli
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import "errors"
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var (
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argsRangeErr = errors.New("index out of range")
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)
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// Args wraps a string slice with some convenience methods
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type Args struct {
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slice []string
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}
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// Get returns the nth argument, or else a blank string
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func (a *Args) Get(n int) string {
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if len(a.slice) > n {
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return a.slice[n]
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}
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return ""
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}
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// First returns the first argument, or else a blank string
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func (a *Args) First() string {
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return a.Get(0)
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}
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// Tail returns the rest of the arguments (not the first one)
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// or else an empty string slice
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func (a *Args) Tail() []string {
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if a.Len() >= 2 {
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return a.slice[1:]
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}
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return []string{}
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}
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// Len returns the length of the wrapped slice
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func (a *Args) Len() int {
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return len(a.slice)
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}
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// Present checks if there are any arguments present
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func (a *Args) Present() bool {
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return a.Len() != 0
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}
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// Swap swaps arguments at the given indexes
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func (a *Args) Swap(from, to int) error {
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if from >= a.Len() || to >= a.Len() {
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return argsRangeErr
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}
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a.slice[from], a.slice[to] = a.slice[to], a.slice[from]
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return nil
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}
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// Slice returns a copy of the internal slice
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func (a *Args) Slice() []string {
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ret := make([]string, len(a.slice))
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copy(ret, a.slice)
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return ret
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}
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