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package cli
import (
"encoding/json"
"flag"
"fmt"
"strconv"
"strings"
)
// IntSlice wraps []int to satisfy flag.Value
type IntSlice struct {
slice []int
hasBeenSet bool
}
// NewIntSlice makes an *IntSlice with default values
func NewIntSlice(defaults ...int) *IntSlice {
return &IntSlice{slice: append([]int{}, defaults...)}
}
// TODO: Consistently have specific Set function for Int64 and Float64 ?
// SetInt directly adds an integer to the list of values
func (i *IntSlice) SetInt(value int) {
if !i.hasBeenSet {
i.slice = []int{}
i.hasBeenSet = true
}
i.slice = append(i.slice, value)
}
// Set parses the value into an integer and appends it to the list of values
func (i *IntSlice) Set(value string) error {
if !i.hasBeenSet {
i.slice = []int{}
i.hasBeenSet = true
}
if strings.HasPrefix(value, slPfx) {
// Deserializing assumes overwrite
_ = json.Unmarshal([]byte(strings.Replace(value, slPfx, "", 1)), &i.slice)
i.hasBeenSet = true
return nil
}
tmp, err := strconv.ParseInt(value, 0, 64)
if err != nil {
return err
}
i.slice = append(i.slice, int(tmp))
return nil
}
// String returns a readable representation of this value (for usage defaults)
func (i *IntSlice) String() string {
return fmt.Sprintf("%#v", i.slice)
}
// Serialize allows IntSlice to fulfill Serializer
func (i *IntSlice) 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 *IntSlice) Value() []int {
return i.slice
}
// Get returns the slice of ints set by this flag
func (i *IntSlice) Get() interface{} {
return *i
}
// IntSliceFlag is a flag with type *IntSlice
type IntSliceFlag struct {
Name string
Aliases []string
Usage string
EnvVars []string
FilePath string
Required bool
Hidden bool
Value *IntSlice
DefaultText string
HasBeenSet bool
}
// IsSet returns whether or not the flag has been set through env or file
func (f *IntSliceFlag) IsSet() bool {
return f.HasBeenSet
}
// String returns a readable representation of this value
// (for usage defaults)
func (f *IntSliceFlag) String() string {
return FlagStringer(f)
}
// Names returns the names of the flag
func (f *IntSliceFlag) Names() []string {
return flagNames(f)
}
// IsRequired returns whether or not the flag is required
func (f *IntSliceFlag) IsRequired() bool {
return f.Required
}
// TakesValue returns true of the flag takes a value, otherwise false
func (f *IntSliceFlag) TakesValue() bool {
return true
}
// GetUsage returns the usage string for the flag
func (f IntSliceFlag) 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 *IntSliceFlag) GetValue() string {
if f.Value != nil {
return f.Value.String()
}
return ""
}
// Apply populates the flag given the flag set and environment
func (f *IntSliceFlag) Apply(set *flag.FlagSet) error {
if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
f.Value = &IntSlice{}
for _, s := range strings.Split(val, ",") {
if err := f.Value.Set(strings.TrimSpace(s)); err != nil {
return fmt.Errorf("could not parse %q as int slice value for flag %s: %s", val, f.Name, err)
}
}
f.HasBeenSet = true
}
for _, name := range f.Names() {
if f.Value == nil {
f.Value = &IntSlice{}
}
set.Var(f.Value, name, f.Usage)
}
return nil
}
// IntSlice looks up the value of a local IntSliceFlag, returns
// nil if not found
func (c *Context) IntSlice(name string) []int {
if fs := lookupFlagSet(name, c); fs != nil {
return lookupIntSlice(name, c.flagSet)
}
return nil
}
func lookupIntSlice(name string, set *flag.FlagSet) []int {
f := set.Lookup(name)
if f != nil {
parsed, err := (f.Value.(*IntSlice)).Value(), error(nil)
if err != nil {
return nil
}
return parsed
}
return nil
}
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