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