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package pflag
import (
"fmt"
"strings"
"time"
)
// TimeValue adapts time.Time for use as a flag.
type timeValue struct {
*time.Time
formats []string
}
func newTimeValue(val time.Time, p *time.Time, formats []string) *timeValue {
*p = val
return &timeValue{
Time: p,
formats: formats,
}
}
// Set time.Time value from string based on accepted formats.
func (d *timeValue) Set(s string) error {
s = strings.TrimSpace(s)
for _, f := range d.formats {
v, err := time.Parse(f, s)
if err != nil {
continue
}
*d.Time = v
return nil
}
formatsString := ""
for i, f := range d.formats {
if i > 0 {
formatsString += ", "
}
formatsString += fmt.Sprintf("`%s`", f)
}
return fmt.Errorf("invalid time format `%s` must be one of: %s", s, formatsString)
}
// Type name for time.Time flags.
func (d *timeValue) Type() string {
return "time"
}
func (d *timeValue) String() string {
if d.Time.IsZero() {
return ""
} else {
return d.Time.Format(time.RFC3339Nano)
}
}
// GetTime return the time value of a flag with the given name
func (f *FlagSet) GetTime(name string) (time.Time, error) {
flag := f.Lookup(name)
if flag == nil {
err := fmt.Errorf("flag accessed but not defined: %s", name)
return time.Time{}, err
}
if flag.Value.Type() != "time" {
err := fmt.Errorf("trying to get %s value of flag of type %s", "time", flag.Value.Type())
return time.Time{}, err
}
val, ok := flag.Value.(*timeValue)
if !ok {
return time.Time{}, fmt.Errorf("value %s is not a time", flag.Value)
}
return *val.Time, nil
}
// TimeVar defines a time.Time flag with specified name, default value, and usage string.
// The argument p points to a time.Time variable in which to store the value of the flag.
func (f *FlagSet) TimeVar(p *time.Time, name string, value time.Time, formats []string, usage string) {
f.TimeVarP(p, name, "", value, formats, usage)
}
// TimeVarP is like TimeVar, but accepts a shorthand letter that can be used after a single dash.
func (f *FlagSet) TimeVarP(p *time.Time, name, shorthand string, value time.Time, formats []string, usage string) {
f.VarP(newTimeValue(value, p, formats), name, shorthand, usage)
}
// TimeVar defines a time.Time flag with specified name, default value, and usage string.
// The argument p points to a time.Time variable in which to store the value of the flag.
func TimeVar(p *time.Time, name string, value time.Time, formats []string, usage string) {
CommandLine.TimeVarP(p, name, "", value, formats, usage)
}
// TimeVarP is like TimeVar, but accepts a shorthand letter that can be used after a single dash.
func TimeVarP(p *time.Time, name, shorthand string, value time.Time, formats []string, usage string) {
CommandLine.VarP(newTimeValue(value, p, formats), name, shorthand, usage)
}
// Time defines a time.Time flag with specified name, default value, and usage string.
// The return value is the address of a time.Time variable that stores the value of the flag.
func (f *FlagSet) Time(name string, value time.Time, formats []string, usage string) *time.Time {
return f.TimeP(name, "", value, formats, usage)
}
// TimeP is like Time, but accepts a shorthand letter that can be used after a single dash.
func (f *FlagSet) TimeP(name, shorthand string, value time.Time, formats []string, usage string) *time.Time {
p := new(time.Time)
f.TimeVarP(p, name, shorthand, value, formats, usage)
return p
}
// Time defines a time.Time flag with specified name, default value, and usage string.
// The return value is the address of a time.Time variable that stores the value of the flag.
func Time(name string, value time.Time, formats []string, usage string) *time.Time {
return CommandLine.TimeP(name, "", value, formats, usage)
}
// TimeP is like Time, but accepts a shorthand letter that can be used after a single dash.
func TimeP(name, shorthand string, value time.Time, formats []string, usage string) *time.Time {
return CommandLine.TimeP(name, shorthand, value, formats, usage)
}
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