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package cli
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import (
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"errors"
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"flag"
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"fmt"
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"strconv"
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)
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// boolValue needs to implement the boolFlag internal interface in flag
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// to be able to capture bool fields and values
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//
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// type boolFlag interface {
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// Value
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// IsBoolFlag() bool
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// }
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type boolValue struct {
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destination *bool
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count *int
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}
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func newBoolValue(val bool, p *bool, count *int) *boolValue {
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*p = val
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return &boolValue{
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destination: p,
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count: count,
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}
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}
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func (b *boolValue) Set(s string) error {
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v, err := strconv.ParseBool(s)
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if err != nil {
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err = errors.New("parse error")
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return err
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}
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*b.destination = v
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if b.count != nil {
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*b.count = *b.count + 1
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}
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return err
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}
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func (b *boolValue) Get() interface{} { return *b.destination }
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func (b *boolValue) String() string {
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if b.destination != nil {
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return strconv.FormatBool(*b.destination)
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}
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return strconv.FormatBool(false)
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}
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func (b *boolValue) IsBoolFlag() bool { return true }
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func (b *boolValue) Count() int {
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if b.count != nil {
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return *b.count
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}
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return 0
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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 *BoolFlag) GetValue() string {
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return ""
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}
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// GetDefaultText returns the default text for this flag
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func (f *BoolFlag) GetDefaultText() string {
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if f.DefaultText != "" {
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return f.DefaultText
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}
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return fmt.Sprintf("%v", f.defaultValue)
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}
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// RunAction executes flag action if set
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func (f *BoolFlag) RunAction(c *Context) error {
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if f.Action != nil {
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return f.Action(c, c.Bool(f.Name))
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}
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return nil
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}
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// Apply populates the flag given the flag set and environment
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func (f *BoolFlag) Apply(set *flag.FlagSet) error {
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// set default value so that environment wont be able to overwrite it
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f.defaultValue = f.Value
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if val, source, found := flagFromEnvOrFile(f.EnvVars, f.FilePath); found {
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if val != "" {
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valBool, err := strconv.ParseBool(val)
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if err != nil {
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return fmt.Errorf("could not parse %q as bool value from %s for flag %s: %s", val, source, f.Name, err)
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}
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f.Value = valBool
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} else {
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// empty value implies that the env is defined but set to empty string, we have to assume that this is
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// what the user wants. If user doesnt want this then the env needs to be deleted or the flag removed from
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// file
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f.Value = false
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}
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f.HasBeenSet = true
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}
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count := f.Count
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dest := f.Destination
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if count == nil {
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count = new(int)
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}
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if dest == nil {
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dest = new(bool)
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}
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for _, name := range f.Names() {
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value := newBoolValue(f.Value, dest, count)
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set.Var(value, name, f.Usage)
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}
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return nil
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}
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// Get returns the flag’s value in the given Context.
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func (f *BoolFlag) Get(ctx *Context) bool {
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return ctx.Bool(f.Name)
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}
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// Bool looks up the value of a local BoolFlag, returns
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// false if not found
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func (cCtx *Context) Bool(name string) bool {
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if fs := cCtx.lookupFlagSet(name); fs != nil {
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return lookupBool(name, fs)
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}
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return false
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}
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func lookupBool(name string, set *flag.FlagSet) bool {
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f := set.Lookup(name)
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if f != nil {
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parsed, err := strconv.ParseBool(f.Value.String())
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if err != nil {
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return false
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}
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return parsed
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}
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return false
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}
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