-
Notifications
You must be signed in to change notification settings - Fork 61
/
generator_common.go
184 lines (158 loc) · 4.79 KB
/
generator_common.go
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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
package generator
import (
"bufio"
"errors"
"fmt"
f "github.com/containrrr/shoutrrr/pkg/format"
"github.com/fatih/color"
"io"
re "regexp"
"strconv"
)
var errInvalidFormat = errors.New("invalid format")
// ValidateFormat is a validation wrapper turning false bool results into errors
func ValidateFormat(validator func(string) bool) func(string) error {
return func(answer string) error {
if validator(answer) {
return nil
}
return errInvalidFormat
}
}
var errRequired = errors.New("field is required")
// Required is a validator that checks whether the input contains any characters
func Required(answer string) error {
if answer == "" {
return errRequired
}
return nil
}
// UserDialog is an abstraction for question/answer based user interaction
type UserDialog struct {
reader io.Reader
writer io.Writer
scanner *bufio.Scanner
props map[string]string
}
// NewUserDialog initializes a UserDialog with safe defaults
func NewUserDialog(reader io.Reader, writer io.Writer, props map[string]string) *UserDialog {
if props == nil {
props = map[string]string{}
}
return &UserDialog{
reader: reader,
writer: writer,
scanner: bufio.NewScanner(reader),
props: props,
}
}
// Write message to user
func (ud *UserDialog) Write(message string, v ...interface{}) {
if _, err := fmt.Fprintf(ud.writer, message, v...); err != nil {
fmt.Printf("failed to write to output: %v", err)
}
}
// Writeln writes a message to the user that completes a line
func (ud *UserDialog) Writeln(format string, v ...interface{}) {
ud.Write(format+"\n", v...)
}
// Query writes the prompt to the user and returns the regex groups if it matches the validator pattern
func (ud *UserDialog) Query(prompt string, validator *re.Regexp, key string) (groups []string) {
ud.QueryString(prompt, ValidateFormat(func(answer string) bool {
groups = validator.FindStringSubmatch(answer)
return groups != nil
}), key)
return groups
}
// QueryAll is a version of Query that can return multiple matches
func (ud *UserDialog) QueryAll(prompt string, validator *re.Regexp, key string, maxMatches int) (matches [][]string) {
ud.QueryString(prompt, ValidateFormat(func(answer string) bool {
matches = validator.FindAllStringSubmatch(answer, maxMatches)
return matches != nil
}), key)
return matches
}
// QueryString writes the prompt to the user and returns the answer if it passes the validator function
func (ud *UserDialog) QueryString(prompt string, validator func(string) error, key string) string {
if validator == nil {
validator = func(string) error {
return nil
}
}
answer, foundProp := ud.props[key]
if foundProp {
err := validator(answer)
colAnswer := f.ColorizeValue(answer, false)
colKey := f.ColorizeProp(key)
if err == nil {
ud.Writeln("Using prop value %v for %v", colAnswer, colKey)
return answer
}
ud.Writeln("Supplied prop value %v is not valid for %v: %v", colAnswer, colKey, err)
}
for {
ud.Write("%v ", prompt)
color.Set(color.FgHiWhite)
if !ud.scanner.Scan() {
if err := ud.scanner.Err(); err != nil {
ud.Writeln(err.Error())
continue
}
// Input closed, so let's just return an empty string
return ""
}
answer = ud.scanner.Text()
color.Unset()
if err := validator(answer); err != nil {
ud.Writeln("%v", err)
ud.Writeln("")
continue
}
return answer
}
}
// QueryStringPattern is a version of QueryString taking a regular expression pattern as the validator
func (ud *UserDialog) QueryStringPattern(prompt string, validator *re.Regexp, key string) (answer string) {
if validator == nil {
panic("validator cannot be nil")
}
return ud.QueryString(prompt, func(s string) error {
if validator.MatchString(s) {
return nil
}
return errInvalidFormat
}, key)
}
// QueryInt writes the prompt to the user and returns the answer if it can be parsed as an integer
func (ud *UserDialog) QueryInt(prompt string, key string, bitSize int) (value int64) {
validator := re.MustCompile(`^((0x|#)([0-9a-fA-F]+))|(-?[0-9]+)$`)
ud.QueryString(prompt, func(answer string) error {
groups := validator.FindStringSubmatch(answer)
if len(groups) < 1 {
return errors.New("not a number")
}
number := groups[0]
base := 0
if groups[2] == "#" {
// Explicitly treat #ffa080 as hexadecimal
base = 16
number = groups[3]
}
var err error
value, err = strconv.ParseInt(number, base, bitSize)
return err
}, key)
return value
}
// QueryBool writes the prompt to the user and returns the answer if it can be parsed as a boolean
func (ud *UserDialog) QueryBool(prompt string, key string) (value bool) {
ud.QueryString(prompt, func(answer string) error {
parsed, ok := f.ParseBool(answer, false)
if ok {
value = parsed
return nil
}
return fmt.Errorf("answer using %v or %v", f.ColorizeTrue("yes"), f.ColorizeFalse("no"))
}, key)
return value
}