Lynn
5 years ago
commit
65d28dcc47
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comment: false
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@ -0,0 +1,152 @@
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package cli
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import (
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"flag"
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"fmt"
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"time"
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)
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// Timestamp wrap to satisfy golang's flag interface.
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type Timestamp struct {
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timestamp *time.Time
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hasBeenSet bool
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layout string
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}
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// Timestamp constructor
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func NewTimestamp(timestamp time.Time) *Timestamp {
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return &Timestamp{timestamp: ×tamp}
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}
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// Set the timestamp value directly
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func (t *Timestamp) SetTimestamp(value time.Time) {
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if !t.hasBeenSet {
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t.timestamp = &value
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t.hasBeenSet = true
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}
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}
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// Set the timestamp string layout for future parsing
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func (t *Timestamp) SetLayout(layout string) {
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t.layout = layout
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}
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// Parses the string value to timestamp
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func (t *Timestamp) Set(value string) error {
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timestamp, err := time.Parse(t.layout, value)
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if err != nil {
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return err
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}
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t.timestamp = ×tamp
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t.hasBeenSet = true
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return nil
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}
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// String returns a readable representation of this value (for usage defaults)
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func (t *Timestamp) String() string {
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return fmt.Sprintf("%#v", t.timestamp)
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}
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// Value returns the timestamp value stored in the flag
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func (t *Timestamp) Value() *time.Time {
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return t.timestamp
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}
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// Get returns the flag structure
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func (t *Timestamp) Get() interface{} {
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return *t
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}
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// TimestampFlag is a flag with type time
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type TimestampFlag struct {
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Name string
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Aliases []string
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Usage string
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EnvVars []string
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FilePath string
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Required bool
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Hidden bool
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Layout string
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Value *Timestamp
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DefaultText string
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HasBeenSet bool
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}
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// IsSet returns whether or not the flag has been set through env or file
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func (f *TimestampFlag) IsSet() bool {
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return f.HasBeenSet
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}
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// String returns a readable representation of this value
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// (for usage defaults)
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func (f *TimestampFlag) String() string {
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return FlagStringer(f)
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}
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// Names returns the names of the flag
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func (f *TimestampFlag) Names() []string {
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return flagNames(f)
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}
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// IsRequired returns whether or not the flag is required
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func (f *TimestampFlag) IsRequired() bool {
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return f.Required
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}
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// TakesValue returns true of the flag takes a value, otherwise false
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func (f *TimestampFlag) TakesValue() bool {
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return true
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}
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// GetUsage returns the usage string for the flag
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func (f *TimestampFlag) GetUsage() string {
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return f.Usage
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}
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// GetValue returns the flags value as string representation and an empty
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// string if the flag takes no value at all.
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func (f *TimestampFlag) GetValue() string {
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if f.Value != nil {
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return f.Value.timestamp.String()
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}
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return ""
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}
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// Apply populates the flag given the flag set and environment
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func (f *TimestampFlag) Apply(set *flag.FlagSet) error {
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if f.Layout == "" {
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return fmt.Errorf("timestamp Layout is required")
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}
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f.Value = &Timestamp{}
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f.Value.SetLayout(f.Layout)
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if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
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if err := f.Value.Set(val); err != nil {
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return fmt.Errorf("could not parse %q as timestamp value for flag %s: %s", val, f.Name, err)
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}
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f.HasBeenSet = true
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}
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for _, name := range f.Names() {
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set.Var(f.Value, name, f.Usage)
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}
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return nil
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}
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// Timestamp gets the timestamp from a flag name
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func (c *Context) Timestamp(name string) *time.Time {
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if fs := lookupFlagSet(name, c); fs != nil {
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return lookupTimestamp(name, fs)
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}
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return nil
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}
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// Fetches the timestamp value from the local timestampWrap
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func lookupTimestamp(name string, set *flag.FlagSet) *time.Time {
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f := set.Lookup(name)
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if f != nil {
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return (f.Value.(*Timestamp)).Value()
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}
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return nil
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}
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