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Extract flag options to predict package
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| 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, ",")) | ||
| } |