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form.go
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form.go
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package survey
import (
"fmt"
"github.com/AlecAivazis/survey/v2"
"github.com/kubemq-hub/builder/pkg/utils"
)
const (
FormSave = "<save>"
FormCancel = "<cancel>"
FormDefaults = "<defaults>"
)
type Form struct {
title string
fnMap map[int]func() error
fnItems []interface{}
onError func(err error) error
onSave func() error
onDefault func() error
onCancel func() error
}
func NewForm(title string) *Form {
return &Form{
title: title,
fnMap: map[int]func() error{},
fnItems: []interface{}{},
}
}
func (f *Form) SetOnErrorFn(fn func(err error) error) *Form {
f.onError = fn
return f
}
func (f *Form) SetOnSaveFn(fn func() error) *Form {
f.onSave = fn
return f
}
func (f *Form) SetOnDefaultFn(fn func() error) *Form {
f.onDefault = fn
return f
}
func (f *Form) SetOnCancelFn(fn func() error) *Form {
f.onCancel = fn
return f
}
func (f *Form) AddItem(title interface{}, fn func() error) *Form {
f.fnMap[len(f.fnItems)] = fn
f.fnItems = append(f.fnItems, title)
return f
}
func (f *Form) buildOptions() ([]string, map[string]int) {
m := map[string]int{}
var list []string
for i, item := range f.fnItems {
switch v := item.(type) {
case string:
list = append(list, v)
m[v] = i
case *string:
list = append(list, *v)
m[*v] = i
}
}
return list, m
}
func (f *Form) Render() error {
if len(f.fnItems) == 0 {
return fmt.Errorf("no items to select are available")
}
if f.onSave != nil {
f.AddItem(FormSave, f.onSave)
}
if f.onDefault != nil {
f.AddItem(FormDefaults, f.onDefault)
}
if f.onCancel != nil {
f.AddItem(FormCancel, f.onCancel)
}
itemsLength := len(f.fnItems)
pageSize := 7
if itemsLength > pageSize {
pageSize = len(f.fnItems)
}
if pageSize > 25 {
pageSize = 25
}
lastIndex := 0
for {
options, selectionMap := f.buildOptions()
val := ""
menu := &survey.Select{
Renderer: survey.Renderer{},
Message: f.title,
Options: options,
Default: options[lastIndex],
PageSize: pageSize,
VimMode: false,
FilterMessage: "",
Filter: nil,
}
err := survey.AskOne(menu, &val)
if err != nil {
return err
}
lastIndex = selectionMap[val]
fn, ok := f.fnMap[lastIndex]
if !ok {
return fmt.Errorf("form function for %s not found", val)
}
if fn == nil {
return nil
}
switch val {
case FormSave:
err := fn()
if err == nil {
return nil
}
if f.onError != nil {
err := f.onError(err)
if err != nil {
return err
}
continue
} else {
return err
}
case FormCancel:
_ = fn()
return nil
case FormDefaults:
err := fn()
if err != nil {
if f.onError != nil {
err := f.onError(err)
if err != nil {
return err
}
continue
} else {
return err
}
} else {
continue
}
default:
err := fn()
if err == nil {
continue
}
if f.onError != nil {
err := f.onError(err)
if err != nil {
return err
}
continue
} else {
return err
}
}
}
}
func FormShowErrorFn(err error) error {
utils.Println("<red>%s</>", err.Error())
return nil
}