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

105 lines
2.3 KiB
Go

package cli
import (
"flag"
"fmt"
"strconv"
)
// UintFlag is a flag with type uint
type UintFlag struct {
Name string
Aliases []string
Usage string
EnvVars []string
FilePath string
Required bool
Hidden bool
Value uint
DefaultText string
Destination *uint
HasBeenSet bool
}
// IsSet returns whether or not the flag has been set through env or file
func (f *UintFlag) IsSet() bool {
return f.HasBeenSet
}
// String returns a readable representation of this value
// (for usage defaults)
func (f *UintFlag) String() string {
return FlagStringer(f)
}
// Names returns the names of the flag
func (f *UintFlag) Names() []string {
return flagNames(f.Name, f.Aliases)
}
// IsRequired returns whether or not the flag is required
func (f *UintFlag) IsRequired() bool {
return f.Required
}
// TakesValue returns true of the flag takes a value, otherwise false
func (f *UintFlag) TakesValue() bool {
return true
}
// GetUsage returns the usage string for the flag
func (f *UintFlag) GetUsage() string {
return f.Usage
}
// Apply populates the flag given the flag set and environment
func (f *UintFlag) Apply(set *flag.FlagSet) error {
if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
if val != "" {
valInt, err := strconv.ParseUint(val, 0, 64)
if err != nil {
return fmt.Errorf("could not parse %q as uint value for flag %s: %s", val, f.Name, err)
}
f.Value = uint(valInt)
f.HasBeenSet = true
}
}
for _, name := range f.Names() {
if f.Destination != nil {
set.UintVar(f.Destination, name, f.Value, f.Usage)
continue
}
set.Uint(name, f.Value, f.Usage)
}
return nil
}
// GetValue returns the flags value as string representation and an empty
// string if the flag takes no value at all.
func (f *UintFlag) GetValue() string {
return fmt.Sprintf("%d", f.Value)
}
// Uint looks up the value of a local UintFlag, returns
// 0 if not found
func (c *Context) Uint(name string) uint {
if fs := lookupFlagSet(name, c); fs != nil {
return lookupUint(name, fs)
}
return 0
}
func lookupUint(name string, set *flag.FlagSet) uint {
f := set.Lookup(name)
if f != nil {
parsed, err := strconv.ParseUint(f.Value.String(), 0, 64)
if err != nil {
return 0
}
return uint(parsed)
}
return 0
}