gotty/vendor/github.com/urfave/cli/flag_duration.go
2020-02-28 08:42:08 +02:00

107 lines
2.5 KiB
Go

package cli
import (
"flag"
"fmt"
"time"
)
// DurationFlag is a flag with type time.Duration (see https://golang.org/pkg/time/#ParseDuration)
type DurationFlag struct {
Name string
Usage string
EnvVar string
FilePath string
Required bool
Hidden bool
Value time.Duration
Destination *time.Duration
}
// String returns a readable representation of this value
// (for usage defaults)
func (f DurationFlag) String() string {
return FlagStringer(f)
}
// GetName returns the name of the flag
func (f DurationFlag) GetName() string {
return f.Name
}
// IsRequired returns whether or not the flag is required
func (f DurationFlag) IsRequired() bool {
return f.Required
}
// TakesValue returns true of the flag takes a value, otherwise false
func (f DurationFlag) TakesValue() bool {
return true
}
// GetUsage returns the usage string for the flag
func (f DurationFlag) 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 DurationFlag) GetValue() string {
return f.Value.String()
}
// Duration looks up the value of a local DurationFlag, returns
// 0 if not found
func (c *Context) Duration(name string) time.Duration {
return lookupDuration(name, c.flagSet)
}
// GlobalDuration looks up the value of a global DurationFlag, returns
// 0 if not found
func (c *Context) GlobalDuration(name string) time.Duration {
if fs := lookupGlobalFlagSet(name, c); fs != nil {
return lookupDuration(name, fs)
}
return 0
}
// Apply populates the flag given the flag set and environment
// Ignores errors
func (f DurationFlag) Apply(set *flag.FlagSet) {
_ = f.ApplyWithError(set)
}
// ApplyWithError populates the flag given the flag set and environment
func (f DurationFlag) ApplyWithError(set *flag.FlagSet) error {
if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
envValDuration, err := time.ParseDuration(envVal)
if err != nil {
return fmt.Errorf("could not parse %s as duration for flag %s: %s", envVal, f.Name, err)
}
f.Value = envValDuration
}
eachName(f.Name, func(name string) {
if f.Destination != nil {
set.DurationVar(f.Destination, name, f.Value, f.Usage)
return
}
set.Duration(name, f.Value, f.Usage)
})
return nil
}
func lookupDuration(name string, set *flag.FlagSet) time.Duration {
f := set.Lookup(name)
if f != nil {
parsed, err := time.ParseDuration(f.Value.String())
if err != nil {
return 0
}
return parsed
}
return 0
}