mirror of https://github.com/chzyer/readline.git
120 lines
2.7 KiB
Go
120 lines
2.7 KiB
Go
package readline
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import (
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"bytes"
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"strings"
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)
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type PrefixCompleterInterface interface {
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Print(prefix string, level int, buf *bytes.Buffer)
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Do(line []rune, pos int) (newLine [][]rune, length int)
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GetName() []rune
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GetChildren() []PrefixCompleterInterface
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SetChildren(children []PrefixCompleterInterface)
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}
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type PrefixCompleter struct {
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Name []rune
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Children []PrefixCompleterInterface
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}
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func (p *PrefixCompleter) Tree(prefix string) string {
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buf := bytes.NewBuffer(nil)
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p.Print(prefix, 0, buf)
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return buf.String()
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}
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func Print(p PrefixCompleterInterface, prefix string, level int, buf *bytes.Buffer) {
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if strings.TrimSpace(string(p.GetName())) != "" {
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buf.WriteString(prefix)
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if level > 0 {
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buf.WriteString("├")
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buf.WriteString(strings.Repeat("─", (level*4)-2))
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buf.WriteString(" ")
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}
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buf.WriteString(string(p.GetName()) + "\n")
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level++
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}
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for _, ch := range p.GetChildren() {
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ch.Print(prefix, level, buf)
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}
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}
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func (p *PrefixCompleter) Print(prefix string, level int, buf *bytes.Buffer) {
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Print(p, prefix, level, buf)
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}
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func (p *PrefixCompleter) GetName() []rune {
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return p.Name
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}
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func (p *PrefixCompleter) GetChildren() []PrefixCompleterInterface {
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return p.Children
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}
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func (p *PrefixCompleter) SetChildren(children []PrefixCompleterInterface) {
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p.Children = children
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}
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func NewPrefixCompleter(pc ...PrefixCompleterInterface) *PrefixCompleter {
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return PcItem("", pc...)
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}
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func PcItem(name string, pc ...PrefixCompleterInterface) *PrefixCompleter {
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name += " "
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return &PrefixCompleter{
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Name: []rune(name),
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Children: pc,
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}
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}
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func (p *PrefixCompleter) Do(line []rune, pos int) (newLine [][]rune, offset int) {
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return Do(p, line, pos)
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}
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func Do(p PrefixCompleterInterface, line []rune, pos int) (newLine [][]rune, offset int) {
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line = line[:pos]
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goNext := false
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var lineCompleter PrefixCompleterInterface
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for _, child := range p.GetChildren() {
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childName := child.GetName()
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if len(line) >= len(childName) {
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if runes.HasPrefix(line, childName) {
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if len(line) == len(childName) {
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newLine = append(newLine, []rune{' '})
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} else {
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newLine = append(newLine, childName)
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}
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offset = len(childName)
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lineCompleter = child
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goNext = true
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}
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} else {
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if runes.HasPrefix(childName, line) {
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newLine = append(newLine, childName[len(line):])
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offset = len(line)
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lineCompleter = child
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}
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}
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}
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if len(newLine) != 1 {
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return
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}
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tmpLine := make([]rune, 0, len(line))
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for i := offset; i < len(line); i++ {
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if line[i] == ' ' {
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continue
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}
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tmpLine = append(tmpLine, line[i:]...)
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return lineCompleter.Do(tmpLine, len(tmpLine))
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}
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if goNext {
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return lineCompleter.Do(nil, 0)
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}
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return
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}
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