-
Notifications
You must be signed in to change notification settings - Fork 124
/
level.go
105 lines (79 loc) · 1.84 KB
/
level.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
// Copyright 2021-2024 Zenauth Ltd.
// SPDX-License-Identifier: Apache-2.0
package outputcolor
import (
"fmt"
"os"
"reflect"
"github.com/alecthomas/kong"
"github.com/jwalton/go-supportscolor"
)
type Level uint8
const (
None = Level(supportscolor.None)
Basic = Level(supportscolor.Basic)
Ansi256 = Level(supportscolor.Ansi256)
Ansi16m = Level(supportscolor.Ansi16m)
)
func DefaultLevel() Level {
return Level(supportscolor.SupportsColor(os.Stdout.Fd(), supportscolor.SniffFlagsOption(false)).Level)
}
var TypeMapper = kong.TypeMapper(reflect.TypeOf((*Level)(nil)), kong.MapperFunc(decode))
func (l *Level) Resolve(disable bool) Level {
if disable {
return None
}
if l != nil {
return *l
}
return DefaultLevel()
}
func (l Level) Enabled() bool {
return l > None
}
func decode(ctx *kong.DecodeContext, target reflect.Value) error {
level, err := scan(ctx)
if err != nil {
return err
}
target.Set(reflect.ValueOf(level))
return nil
}
func scan(ctx *kong.DecodeContext) (*Level, error) {
token := ctx.Scan.Peek()
switch token.Type {
case kong.FlagValueToken:
return parse(ctx.Scan.Pop().Value)
case kong.ShortFlagTailToken, kong.UntypedToken:
level, err := parse(token.Value)
if err == nil {
ctx.Scan.Pop()
return level, nil
}
default:
}
return pointer(Basic), nil
}
func parse(v any) (*Level, error) {
s, ok := v.(string)
if !ok {
return nil, fmt.Errorf("invalid flag value (expected string, got %T)", v)
}
switch s {
case "auto":
return nil, nil
case "false", "never":
return pointer(None), nil
case "true", "always":
return pointer(Basic), nil
case "256":
return pointer(Ansi256), nil
case "16m", "full", "truecolor":
return pointer(Ansi16m), nil
default:
return nil, fmt.Errorf("invalid value for output color level: %q", s)
}
}
func pointer(level Level) *Level {
return &level
}