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
|
package util
import (
"math"
"os"
"time"
"github.com/mattn/go-isatty"
"github.com/mattn/go-runewidth"
)
var _runeWidths = make(map[rune]int)
// RuneWidth returns rune width
func RuneWidth(r rune, prefixWidth int, tabstop int) int {
if r == '\t' {
return tabstop - prefixWidth%tabstop
} else if w, found := _runeWidths[r]; found {
return w
} else if r == '\n' || r == '\r' {
return 1
}
w := runewidth.RuneWidth(r)
_runeWidths[r] = w
return w
}
// Max returns the largest integer
func Max(first int, second int) int {
if first >= second {
return first
}
return second
}
// Max16 returns the largest integer
func Max16(first int16, second int16) int16 {
if first >= second {
return first
}
return second
}
// Max32 returns the largest 32-bit integer
func Max32(first int32, second int32) int32 {
if first > second {
return first
}
return second
}
// Min returns the smallest integer
func Min(first int, second int) int {
if first <= second {
return first
}
return second
}
// Min32 returns the smallest 32-bit integer
func Min32(first int32, second int32) int32 {
if first <= second {
return first
}
return second
}
// Constrain32 limits the given 32-bit integer with the upper and lower bounds
func Constrain32(val int32, min int32, max int32) int32 {
if val < min {
return min
}
if val > max {
return max
}
return val
}
// Constrain limits the given integer with the upper and lower bounds
func Constrain(val int, min int, max int) int {
if val < min {
return min
}
if val > max {
return max
}
return val
}
func AsUint16(val int) uint16 {
if val > math.MaxUint16 {
return math.MaxUint16
} else if val < 0 {
return 0
}
return uint16(val)
}
// DurWithin limits the given time.Duration with the upper and lower bounds
func DurWithin(
val time.Duration, min time.Duration, max time.Duration) time.Duration {
if val < min {
return min
}
if val > max {
return max
}
return val
}
// IsTty returns true is stdin is a terminal
func IsTty() bool {
return isatty.IsTerminal(os.Stdin.Fd())
}
// Once returns a function that returns the specified boolean value only once
func Once(nextResponse bool) func() bool {
state := nextResponse
return func() bool {
prevState := state
state = false
return prevState
}
}
|