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predictors.go
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/
predictors.go
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package cli
import (
"fmt"
"io/ioutil"
"strings"
"github.com/posener/complete"
)
// PredictorWrapper merges a flag with its predictor
type PredictorWrapper struct {
complete.Predictor
Flag *FlagWrapper
PredictNothing bool
}
// PredictorWrappers maps a flag name to its predictor wrapper
type PredictorWrappers map[string]PredictorWrapper
// FlagValue is a generalized storage for a flag's value
type FlagValue struct {
Val string
FlagType string
Name string
DefaultValue string
Shorthand string
}
type FlagWrapper struct {
Val *FlagValue
FlagType string
Name string
FriendlyName string
Shorthand string
Usage string
Global bool
Hidden bool
}
func (f FlagValue) IsBool() bool {
return f.FlagType == "bool"
}
func (f *FlagValue) Set(v string) error {
if f.FlagType == "" || f.FlagType == "string" {
if v != "" && len(v) > 1 && strings.HasPrefix(v, "@") {
f.FlagType = "file"
fname := v[1:]
if b, err := ioutil.ReadFile(fname); err != nil {
return err
} else {
f.Val = string(b)
return nil
}
}
}
f.Val = v
return nil
}
func (f *FlagValue) Type() string {
return f.FlagType
}
func (f *FlagValue) String() string {
return f.Val
}
func (w PredictorWrappers) Merge(wrappers PredictorWrappers, errorOnConflict bool) (PredictorWrappers, error) {
if errorOnConflict {
for k, v := range wrappers {
if v, ok := w[k]; ok && v.Predictor != nil {
return nil, fmt.Errorf("duplicate predictor: '%s'", k)
}
w[k] = v
}
} else {
for k, v := range wrappers {
w[k] = v
}
}
return w, nil
}