/
time.go
95 lines (79 loc) · 2.03 KB
/
time.go
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package main
import (
"fmt"
"regexp"
"strconv"
"strings"
"time"
)
// Time is a time in HH:MM:SS format.
type Time time.Duration
var timeRe = regexp.MustCompile(`(?:(\d+):)?(?:(\d+):)?(\d+)(?:\.(\d+))?$`)
// ParseTime parses a time in H:M:S, M:S or S format.
func ParseTime(v string) (Time, error) {
if count := strings.Count(v, ":"); count < 2 {
v = strings.Repeat("0:", 2-count) + v
}
var h, m, s int
var trailing string
n, err := fmt.Sscanf(v, "%d:%d:%d%s", &h, &m, &s, &trailing)
if n < 3 && err != nil {
return 0, fmt.Errorf("failed to parse time: %w", err)
}
d := 0 +
time.Duration(h)*time.Hour +
time.Duration(m)*time.Minute +
time.Duration(s)*time.Second
if trailing != "" {
if !strings.HasPrefix(trailing, ".") {
return 0, fmt.Errorf("invalid trailing seconds: %q", trailing)
}
frac, err := strconv.ParseFloat("0"+trailing, 64)
if err != nil {
return 0, fmt.Errorf("failed to parse fractional seconds: %w", err)
}
d += time.Duration(frac * float64(time.Second))
}
return Time(d), nil
}
// MustParseTime parses a time in HH:MM:SS format. It panics if the time cannot
// be parsed.
func MustParseTime(v string) Time {
t, err := ParseTime(v)
if err != nil {
panic(err)
}
return t
}
// AsDuration returns the time as a time.Duration.
func (t Time) AsDuration() time.Duration {
return time.Duration(t)
}
// String implements fmt.Stringer.
func (t Time) String() string {
h := int(t.AsDuration() / time.Hour)
t -= Time(h) * Time(time.Hour)
m := int(t.AsDuration() / time.Minute)
t -= Time(m) * Time(time.Minute)
s := int(t.AsDuration() / time.Second)
t -= Time(s) * Time(time.Second)
part := fmt.Sprintf("%02d:%02d:%02d", h, m, s)
if t != 0 {
frac := fmt.Sprintf("%f", t.AsDuration().Seconds())
part += strings.TrimPrefix(frac, "0")
}
return part
}
// Set sets the value of the flag given a string.
func (t *Time) Set(v string) error {
new, err := ParseTime(v)
if err != nil {
return err
}
*t = new
return nil
}
// Type implements pflag.Value.
func (t Time) Type() string {
return "time"
}