package cli
import (
"flag"
"fmt"
"strconv"
)
// Float64Flag is a flag with type float64
type Float64Flag struct {
Name string
Aliases []string
Usage string
EnvVars []string
FilePath string
Required bool
Hidden bool
Value float64
DefaultText string
Destination *float64
HasBeenSet bool
}
// IsSet returns whether or not the flag has been set through env or file
func (f *Float64Flag) IsSet() bool {
return f.HasBeenSet
// String returns a readable representation of this value
// (for usage defaults)
func (f *Float64Flag) String() string {
return FlagStringer(f)
// Names returns the names of the flag
func (f *Float64Flag) Names() []string {
return flagNames(f.Name, f.Aliases)
// IsRequired returns whether or not the flag is required
func (f *Float64Flag) IsRequired() bool {
return f.Required
// TakesValue returns true of the flag takes a value, otherwise false
func (f *Float64Flag) TakesValue() bool {
return true
// GetUsage returns the usage string for the flag
func (f *Float64Flag) 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 *Float64Flag) GetValue() string {
return fmt.Sprintf("%f", f.Value)
// IsVisible returns true if the flag is not hidden, otherwise false
func (f *Float64Flag) IsVisible() bool {
return !f.Hidden
// Apply populates the flag given the flag set and environment
func (f *Float64Flag) Apply(set *flag.FlagSet) error {
if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
if val != "" {
valFloat, err := strconv.ParseFloat(val, 10)
if err != nil {
return fmt.Errorf("could not parse %q as float64 value for flag %s: %s", val, f.Name, err)