package cli
import (
"encoding/json"
"flag"
"fmt"
"strconv"
"strings"
)
// Int64Slice wraps []int64 to satisfy flag.Value
type Int64Slice struct {
slice []int64
hasBeenSet bool
}
// NewInt64Slice makes an *Int64Slice with default values
func NewInt64Slice(defaults ...int64) *Int64Slice {
return &Int64Slice{slice: append([]int64{}, defaults...)}
// clone allocate a copy of self object
func (i *Int64Slice) clone() *Int64Slice {
n := &Int64Slice{
slice: make([]int64, len(i.slice)),
hasBeenSet: i.hasBeenSet,
copy(n.slice, i.slice)
return n
// Set parses the value into an integer and appends it to the list of values
func (i *Int64Slice) Set(value string) error {
if !i.hasBeenSet {
i.slice = []int64{}
i.hasBeenSet = true
if strings.HasPrefix(value, slPfx) {
// Deserializing assumes overwrite
_ = json.Unmarshal([]byte(strings.Replace(value, slPfx, "", 1)), &i.slice)
return nil
tmp, err := strconv.ParseInt(value, 0, 64)
if err != nil {
return err
i.slice = append(i.slice, tmp)
// String returns a readable representation of this value (for usage defaults)
func (i *Int64Slice) String() string {
return fmt.Sprintf("%#v", i.slice)
// Serialize allows Int64Slice to fulfill Serializer
func (i *Int64Slice) Serialize() string {
jsonBytes, _ := json.Marshal(i.slice)
return fmt.Sprintf("%s%s", slPfx, string(jsonBytes))
// Value returns the slice of ints set by this flag
func (i *Int64Slice) Value() []int64 {
return i.slice
// Get returns the slice of ints set by this flag
func (i *Int64Slice) Get() interface{} {
return *i
// Int64SliceFlag is a flag with type *Int64Slice
type Int64SliceFlag struct {
Name string
Aliases []string
Usage string
EnvVars []string
FilePath string
Required bool
Hidden bool
Value *Int64Slice
DefaultText string
HasBeenSet bool
// IsSet returns whether or not the flag has been set through env or file
func (f *Int64SliceFlag) IsSet() bool {
return f.HasBeenSet
// String returns a readable representation of this value
// (for usage defaults)
func (f *Int64SliceFlag) String() string {
return FlagStringer(f)
// Names returns the names of the flag
func (f *Int64SliceFlag) Names() []string {
return flagNames(f.Name, f.Aliases)
// IsRequired returns whether or not the flag is required
func (f *Int64SliceFlag) IsRequired() bool {
return f.Required
// TakesValue returns true of the flag takes a value, otherwise false
func (f *Int64SliceFlag) TakesValue() bool {
return true
// GetUsage returns the usage string for the flag
func (f Int64SliceFlag) 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 *Int64SliceFlag) GetValue() string {
if f.Value != nil {
return f.Value.String()
return ""
// Apply populates the flag given the flag set and environment
func (f *Int64SliceFlag) Apply(set *flag.FlagSet) error {
if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
f.Value = &Int64Slice{}
for _, s := range strings.Split(val, ",") {
if err := f.Value.Set(strings.TrimSpace(s)); err != nil {
return fmt.Errorf("could not parse %q as int64 slice value for flag %s: %s", val, f.Name, err)
f.HasBeenSet = true
if f.Value == nil {
copyValue := f.Value.clone()
for _, name := range f.Names() {
set.Var(copyValue, name, f.Usage)
// Int64Slice looks up the value of a local Int64SliceFlag, returns
// nil if not found
func (c *Context) Int64Slice(name string) []int64 {
if fs := lookupFlagSet(name, c); fs != nil {
return lookupInt64Slice(name, fs)
func lookupInt64Slice(name string, set *flag.FlagSet) []int64 {
f := set.Lookup(name)
if f != nil {
if slice, ok := f.Value.(*Int64Slice); ok {
return slice.Value()