go-sample-webpage/vendor/github.com/urfave/cli/v2/flag_timestamp.go
2021-11-08 02:25:36 +01:00

154 lines
3.4 KiB
Go

package cli
import (
"flag"
"fmt"
"time"
)
// Timestamp wrap to satisfy golang's flag interface.
type Timestamp struct {
timestamp *time.Time
hasBeenSet bool
layout string
}
// Timestamp constructor
func NewTimestamp(timestamp time.Time) *Timestamp {
return &Timestamp{timestamp: &timestamp}
}
// Set the timestamp value directly
func (t *Timestamp) SetTimestamp(value time.Time) {
if !t.hasBeenSet {
t.timestamp = &value
t.hasBeenSet = true
}
}
// Set the timestamp string layout for future parsing
func (t *Timestamp) SetLayout(layout string) {
t.layout = layout
}
// Parses the string value to timestamp
func (t *Timestamp) Set(value string) error {
timestamp, err := time.Parse(t.layout, value)
if err != nil {
return err
}
t.timestamp = &timestamp
t.hasBeenSet = true
return nil
}
// String returns a readable representation of this value (for usage defaults)
func (t *Timestamp) String() string {
return fmt.Sprintf("%#v", t.timestamp)
}
// Value returns the timestamp value stored in the flag
func (t *Timestamp) Value() *time.Time {
return t.timestamp
}
// Get returns the flag structure
func (t *Timestamp) Get() interface{} {
return *t
}
// TimestampFlag is a flag with type time
type TimestampFlag struct {
Name string
Aliases []string
Usage string
EnvVars []string
FilePath string
Required bool
Hidden bool
Layout string
Value *Timestamp
DefaultText string
HasBeenSet bool
}
// IsSet returns whether or not the flag has been set through env or file
func (f *TimestampFlag) IsSet() bool {
return f.HasBeenSet
}
// String returns a readable representation of this value
// (for usage defaults)
func (f *TimestampFlag) String() string {
return FlagStringer(f)
}
// Names returns the names of the flag
func (f *TimestampFlag) Names() []string {
return flagNames(f.Name, f.Aliases)
}
// IsRequired returns whether or not the flag is required
func (f *TimestampFlag) IsRequired() bool {
return f.Required
}
// TakesValue returns true of the flag takes a value, otherwise false
func (f *TimestampFlag) TakesValue() bool {
return true
}
// GetUsage returns the usage string for the flag
func (f *TimestampFlag) GetUsage() string {
return f.Usage
}
// GetValue returns the flags value as string representation and an empty
// string if the flag takes no value at all.
func (f *TimestampFlag) GetValue() string {
if f.Value != nil {
return f.Value.timestamp.String()
}
return ""
}
// Apply populates the flag given the flag set and environment
func (f *TimestampFlag) Apply(set *flag.FlagSet) error {
if f.Layout == "" {
return fmt.Errorf("timestamp Layout is required")
}
if f.Value == nil {
f.Value = &Timestamp{}
}
f.Value.SetLayout(f.Layout)
if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
if err := f.Value.Set(val); err != nil {
return fmt.Errorf("could not parse %q as timestamp value for flag %s: %s", val, f.Name, err)
}
f.HasBeenSet = true
}
for _, name := range f.Names() {
set.Var(f.Value, name, f.Usage)
}
return nil
}
// Timestamp gets the timestamp from a flag name
func (c *Context) Timestamp(name string) *time.Time {
if fs := lookupFlagSet(name, c); fs != nil {
return lookupTimestamp(name, fs)
}
return nil
}
// Fetches the timestamp value from the local timestampWrap
func lookupTimestamp(name string, set *flag.FlagSet) *time.Time {
f := set.Lookup(name)
if f != nil {
return (f.Value.(*Timestamp)).Value()
}
return nil
}