180 lines
4.2 KiB
Go
180 lines
4.2 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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"strings"
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)
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// StringSlice wraps a []string to satisfy flag.Value
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type StringSlice struct {
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slice []string
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hasBeenSet bool
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}
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// NewStringSlice creates a *StringSlice with default values
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func NewStringSlice(defaults ...string) *StringSlice {
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return &StringSlice{slice: append([]string{}, defaults...)}
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}
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// Set appends the string value to the list of values
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func (s *StringSlice) Set(value string) error {
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if !s.hasBeenSet {
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s.slice = []string{}
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s.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)), &s.slice)
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s.hasBeenSet = true
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return nil
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}
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s.slice = append(s.slice, value)
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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 (s *StringSlice) String() string {
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return fmt.Sprintf("%s", s.slice)
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}
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// Serialize allows StringSlice to fulfill Serializer
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func (s *StringSlice) Serialize() string {
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jsonBytes, _ := json.Marshal(s.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 strings set by this flag
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func (s *StringSlice) Value() []string {
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return s.slice
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}
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// Get returns the slice of strings set by this flag
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func (s *StringSlice) Get() interface{} {
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return *s
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}
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// StringSliceFlag is a flag with type *StringSlice
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type StringSliceFlag 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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TakesFile bool
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Value *StringSlice
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DefaultText string
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HasBeenSet bool
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Destination *StringSlice
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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 *StringSliceFlag) 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 *StringSliceFlag) 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 *StringSliceFlag) 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 *StringSliceFlag) 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 *StringSliceFlag) 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 *StringSliceFlag) 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 *StringSliceFlag) 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 *StringSliceFlag) Apply(set *flag.FlagSet) error {
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if f.Destination != nil && f.Value != nil {
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f.Destination.slice = make([]string, len(f.Value.slice))
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copy(f.Destination.slice, f.Value.slice)
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}
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if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
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if f.Value == nil {
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f.Value = &StringSlice{}
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}
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destination := f.Value
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if f.Destination != nil {
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destination = f.Destination
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}
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for _, s := range strings.Split(val, ",") {
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if err := destination.Set(strings.TrimSpace(s)); err != nil {
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return fmt.Errorf("could not parse %q as string value for flag %s: %s", val, f.Name, err)
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}
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}
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// Set this to false so that we reset the slice if we then set values from
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// flags that have already been set by the environment.
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destination.hasBeenSet = false
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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 = &StringSlice{}
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}
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if f.Destination != nil {
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set.Var(f.Destination, name, f.Usage)
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continue
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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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// StringSlice looks up the value of a local StringSliceFlag, returns
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// nil if not found
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func (c *Context) StringSlice(name string) []string {
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if fs := lookupFlagSet(name, c); fs != nil {
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return lookupStringSlice(name, fs)
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}
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return nil
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}
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func lookupStringSlice(name string, set *flag.FlagSet) []string {
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f := set.Lookup(name)
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if f != nil {
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if slice, ok := f.Value.(*StringSlice); 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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