File: complete_helper.go

package info (click to toggle)
golang-gopkg-readline.v1 1.4-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 292 kB
  • sloc: makefile: 4
file content (165 lines) | stat: -rw-r--r-- 3,962 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
package readline

import (
	"bytes"
	"strings"
)

// Caller type for dynamic completion
type DynamicCompleteFunc func(string) []string

type PrefixCompleterInterface interface {
	Print(prefix string, level int, buf *bytes.Buffer)
	Do(line []rune, pos int) (newLine [][]rune, length int)
	GetName() []rune
	GetChildren() []PrefixCompleterInterface
	SetChildren(children []PrefixCompleterInterface)
}

type DynamicPrefixCompleterInterface interface {
	PrefixCompleterInterface
	IsDynamic() bool
	GetDynamicNames(line []rune) [][]rune
}

type PrefixCompleter struct {
	Name     []rune
	Dynamic  bool
	Callback DynamicCompleteFunc
	Children []PrefixCompleterInterface
}

func (p *PrefixCompleter) Tree(prefix string) string {
	buf := bytes.NewBuffer(nil)
	p.Print(prefix, 0, buf)
	return buf.String()
}

func Print(p PrefixCompleterInterface, prefix string, level int, buf *bytes.Buffer) {
	if strings.TrimSpace(string(p.GetName())) != "" {
		buf.WriteString(prefix)
		if level > 0 {
			buf.WriteString("├")
			buf.WriteString(strings.Repeat("─", (level*4)-2))
			buf.WriteString(" ")
		}
		buf.WriteString(string(p.GetName()) + "\n")
		level++
	}
	for _, ch := range p.GetChildren() {
		ch.Print(prefix, level, buf)
	}
}

func (p *PrefixCompleter) Print(prefix string, level int, buf *bytes.Buffer) {
	Print(p, prefix, level, buf)
}

func (p *PrefixCompleter) IsDynamic() bool {
	return p.Dynamic
}

func (p *PrefixCompleter) GetName() []rune {
	return p.Name
}

func (p *PrefixCompleter) GetDynamicNames(line []rune) [][]rune {
	var names = [][]rune{}
	for _, name := range p.Callback(string(line)) {
		names = append(names, []rune(name+" "))
	}
	return names
}

func (p *PrefixCompleter) GetChildren() []PrefixCompleterInterface {
	return p.Children
}

func (p *PrefixCompleter) SetChildren(children []PrefixCompleterInterface) {
	p.Children = children
}

func NewPrefixCompleter(pc ...PrefixCompleterInterface) *PrefixCompleter {
	return PcItem("", pc...)
}

func PcItem(name string, pc ...PrefixCompleterInterface) *PrefixCompleter {
	name += " "
	return &PrefixCompleter{
		Name:     []rune(name),
		Dynamic:  false,
		Children: pc,
	}
}

func PcItemDynamic(callback DynamicCompleteFunc, pc ...PrefixCompleterInterface) *PrefixCompleter {
	return &PrefixCompleter{
		Callback: callback,
		Dynamic:  true,
		Children: pc,
	}
}

func (p *PrefixCompleter) Do(line []rune, pos int) (newLine [][]rune, offset int) {
	return doInternal(p, line, pos, line)
}

func Do(p PrefixCompleterInterface, line []rune, pos int) (newLine [][]rune, offset int) {
	return doInternal(p, line, pos, line)
}

func doInternal(p PrefixCompleterInterface, line []rune, pos int, origLine []rune) (newLine [][]rune, offset int) {
	line = runes.TrimSpaceLeft(line[:pos])
	goNext := false
	var lineCompleter PrefixCompleterInterface
	for _, child := range p.GetChildren() {
		childNames := make([][]rune, 1)

		childDynamic, ok := child.(DynamicPrefixCompleterInterface)
		if ok && childDynamic.IsDynamic() {
			childNames = childDynamic.GetDynamicNames(origLine)
		} else {
			childNames[0] = child.GetName()
		}

		for _, childName := range childNames {
			if len(line) >= len(childName) {
				if runes.HasPrefix(line, childName) {
					if len(line) == len(childName) {
						newLine = append(newLine, []rune{' '})
					} else {
						newLine = append(newLine, childName)
					}
					offset = len(childName)
					lineCompleter = child
					goNext = true
				}
			} else {
				if runes.HasPrefix(childName, line) {
					newLine = append(newLine, childName[len(line):])
					offset = len(line)
					lineCompleter = child
				}
			}
		}
	}

	if len(newLine) != 1 {
		return
	}

	tmpLine := make([]rune, 0, len(line))
	for i := offset; i < len(line); i++ {
		if line[i] == ' ' {
			continue
		}

		tmpLine = append(tmpLine, line[i:]...)
		return doInternal(lineCompleter, tmpLine, len(tmpLine), origLine)
	}

	if goNext {
		return doInternal(lineCompleter, nil, 0, origLine)
	}
	return
}