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package predict
import (
"fmt"
"github.com/posener/complete/v2"
"strings"
)
// Option provides prediction through options pattern.
//
// Usage:
//
// func(o ...predict.Option) {
// cfg := predict.Options(o)
// // use cfg.Predict...
// }
type Option func(*Config)
// OptValues allows to set a desired set of valid values for the flag.
func OptValues(values ...string) Option {
return OptPredictor(Set(values))
}
// OptPredictor allows to set a custom predictor.
func OptPredictor(p complete.Predictor) Option {
return func(o *Config) { o.Predictor = p }
}
// OptCheck enforces the valid values on the predicted flag.
func OptCheck() Option {
return func(o *Config) { o.check = true }
}
type Config struct {
complete.Predictor
check bool
}
func Options(os ...Option) Config {
var op Config
for _, f := range os {
f(&op)
}
return op
}
func (c Config) Predict(prefix string) []string {
if c.Predictor != nil {
return c.Predictor.Predict(prefix)
}
return nil
}
func (c Config) Check(value string) error {
predictions := c.Predictor.Predict(value)
if !c.check || len(predictions) == 0 {
return nil
}
for _, vv := range predictions {
if value == vv {
return nil
}
}
return fmt.Errorf("not in allowed values: %s", strings.Join(predictions, ","))
}
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