142 lines
3.2 KiB
Go
142 lines
3.2 KiB
Go
package cli
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import (
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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 is an opaque type for []int to satisfy flag.Value and flag.Getter
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type IntSlice []int
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// Set parses the value into an integer and appends it to the list of values
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func (f *IntSlice) Set(value string) error {
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tmp, err := strconv.Atoi(value)
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if err != nil {
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return err
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}
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*f = append(*f, 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 (f *IntSlice) String() string {
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return fmt.Sprintf("%#v", *f)
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}
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// Value returns the slice of ints set by this flag
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func (f *IntSlice) Value() []int {
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return *f
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}
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// Get returns the slice of ints set by this flag
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func (f *IntSlice) Get() interface{} {
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return *f
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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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Usage string
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EnvVar 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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}
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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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// GetName returns the name of the flag
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func (f IntSliceFlag) GetName() string {
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return f.Name
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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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// Ignores errors
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func (f IntSliceFlag) Apply(set *flag.FlagSet) {
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_ = f.ApplyWithError(set)
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}
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// ApplyWithError populates the flag given the flag set and environment
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func (f IntSliceFlag) ApplyWithError(set *flag.FlagSet) error {
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if envVal, ok := flagFromFileEnv(f.FilePath, f.EnvVar); ok {
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newVal := &IntSlice{}
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for _, s := range strings.Split(envVal, ",") {
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s = strings.TrimSpace(s)
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if err := newVal.Set(s); err != nil {
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return fmt.Errorf("could not parse %s as int slice value for flag %s: %s", envVal, f.Name, err)
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}
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}
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if f.Value == nil {
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f.Value = newVal
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} else {
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*f.Value = *newVal
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}
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}
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eachName(f.Name, func(name string) {
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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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return lookupIntSlice(name, c.flagSet)
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}
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// GlobalIntSlice looks up the value of a global IntSliceFlag, returns
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// nil if not found
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func (c *Context) GlobalIntSlice(name string) []int {
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if fs := lookupGlobalFlagSet(name, c); fs != nil {
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return lookupIntSlice(name, fs)
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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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parsed, err := (f.Value.(*IntSlice)).Value(), error(nil)
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if err != nil {
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return nil
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}
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return parsed
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}
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return nil
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}
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