mirror of https://github.com/chzyer/readline.git
93 lines
1.9 KiB
Go
93 lines
1.9 KiB
Go
package readline
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import (
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"bytes"
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"strings"
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"github.com/chzyer/readline/runes"
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)
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type PrefixCompleter struct {
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Name []rune
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Children []*PrefixCompleter
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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 (p *PrefixCompleter) Print(prefix string, level int, buf *bytes.Buffer) {
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if strings.TrimSpace(string(p.Name)) != "" {
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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.Name) + "\n")
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level++
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}
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for _, ch := range p.Children {
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ch.Print(prefix, level, buf)
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}
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}
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func NewPrefixCompleter(pc ...*PrefixCompleter) *PrefixCompleter {
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return PcItem("", pc...)
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}
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func PcItem(name string, pc ...*PrefixCompleter) *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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line = line[:pos]
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goNext := false
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var lineCompleter *PrefixCompleter
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for _, child := range p.Children {
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if len(line) >= len(child.Name) {
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if runes.HasPrefix(line, child.Name) {
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if len(line) == len(child.Name) {
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newLine = append(newLine, []rune{' '})
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} else {
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newLine = append(newLine, child.Name)
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}
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offset = len(child.Name)
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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(child.Name, line) {
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newLine = append(newLine, child.Name[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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