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questionnaire.go
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questionnaire.go
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// Copyright © 2019 Banzai Cloud
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package questionnaire
import (
"reflect"
"strconv"
"time"
"emperror.dev/errors"
"github.com/AlecAivazis/survey/v2"
)
func GetQuestionsFromStruct(obj interface{}) ([]*survey.Question, error) {
qs := make([]*survey.Question, 0)
t := reflect.TypeOf(obj)
v := reflect.ValueOf(obj)
for k := 0; k < t.NumField(); k++ {
f := t.Field(k)
elem := v.Field(k)
desc := f.Tag.Get("survey.question")
if desc != "" {
var def string
switch elem.Kind() {
case reflect.Int32:
def = strconv.Itoa(int(elem.Interface().(int32)))
case reflect.String:
def = elem.Interface().(string)
default:
return nil, errors.Errorf("unsupported field type: %s", elem.Type())
}
qs = append(qs, &survey.Question{
Name: f.Name,
Prompt: &survey.Input{Message: desc, Default: def},
Validate: validateFunc(f.Tag.Get("survey.validate")),
})
}
}
return qs, nil
}
func validateFunc(t string) survey.Validator {
switch t {
case "int":
return func(ans interface{}) error {
if s, ok := ans.(string); ok {
i, err := strconv.Atoi(s)
if err != nil {
return err
}
if i <= 0 {
return errors.New("value must be greater than 0")
}
} else {
return errors.New("invalid input type")
}
return nil
}
case "durationstring":
return func(ans interface{}) error {
if s, ok := ans.(string); ok {
_, err := time.ParseDuration(s)
return err
}
return errors.New("invalid input type")
}
default:
return func(ans interface{}) error {
return nil
}
}
}