mirror of https://github.com/chzyer/readline.git
57 lines
1.1 KiB
Go
57 lines
1.1 KiB
Go
package readline
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func (o *Operation) PrevHistory() []rune {
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if o.current == nil {
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return nil
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}
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current := o.current.Prev()
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if current == nil {
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return nil
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}
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o.current = current
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return current.Value.([]rune)
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}
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func (o *Operation) NextHistory() []rune {
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if o.current == nil {
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return nil
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}
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current := o.current.Next()
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if current == nil {
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return nil
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}
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o.current = current
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return current.Value.([]rune)
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}
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func (o *Operation) NewHistory(current []rune) {
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o.UpdateHistory(current)
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if o.current != o.history.Back() {
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// move history item to current command
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o.history.Remove(o.current)
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use := o.current.Value.([]rune)
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o.current = o.history.Back()
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o.UpdateHistory(use)
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}
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// push a new one to commit current command
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o.PushHistory(nil)
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}
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func (o *Operation) UpdateHistory(s []rune) {
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if o.current == nil {
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o.PushHistory(s)
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return
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}
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r := o.current.Value.([]rune)
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o.current.Value = append(r[:0], s...)
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}
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func (o *Operation) PushHistory(s []rune) {
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// copy
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newCopy := make([]rune, len(s))
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copy(newCopy, s)
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elem := o.history.PushBack(newCopy)
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o.current = elem
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}
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