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item.go
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item.go
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package customise
import (
"errors"
"fmt"
"slices"
"strconv"
)
type Item interface {
Name() string
Value() string
Description() string
Group() string
Validate(s string) error
Set(s string) error
AllowedValues() []string
Type() Type
}
type Type int
const (
TText Type = iota
TMultiline
TRadio
TCheckbox // for booleans
TFile
TFileExisting
)
type VarWrapper struct {
ItemName string
ItemDescr string
ItemGroup string
ItemType Type
ValueFunc func() string
SetFunc func(string) error
ValidateFunc func(string) error
AllowedValuesFunc func() []string
}
func (w VarWrapper) Name() string { return w.ItemName }
func (w VarWrapper) Value() string { return w.ValueFunc() }
func (w VarWrapper) Description() string { return w.ItemDescr }
func (w VarWrapper) Group() string { return w.ItemGroup }
func (w VarWrapper) Validate(s string) error { return w.ValidateFunc(s) }
func (w VarWrapper) Set(s string) error { return w.SetFunc(s) }
func (w VarWrapper) AllowedValues() []string { return w.AllowedValuesFunc() }
func (w VarWrapper) Type() Type { return w.ItemType }
func StringVar(value *string, name, descr, group string) VarWrapper {
return VarWrapper{
ItemName: name,
ItemDescr: descr,
ItemGroup: group,
ItemType: TText,
ValueFunc: func() string { return *value },
SetFunc: func(s string) error {
*value = s
return nil
},
ValidateFunc: func(s string) error { return nil },
}
}
func MultilineVar(value *string, name, descr, group string) VarWrapper {
t := StringVar(value, name, descr, group)
t.ItemType = TMultiline
return t
}
func IntVar[T ~int | ~int8 | ~int16 | ~int32 | ~int64](value *T, name, descr, group string) VarWrapper {
return VarWrapper{
ItemName: name,
ItemDescr: descr,
ItemGroup: group,
ValueFunc: func() string { return strconv.FormatInt(int64(*value), 10) },
SetFunc: func(s string) error {
v, err := strconv.ParseInt(s, 10, 64)
if err != nil {
return err
}
*value = T(v)
return nil
},
ValidateFunc: func(s string) error { return nil },
}
}
func BoolVar(value *bool, name, descr, group string) VarWrapper {
return VarWrapper{
ItemName: name,
ItemDescr: descr,
ItemGroup: group,
ItemType: TCheckbox,
ValueFunc: func() string {
return strconv.FormatBool(*value)
},
SetFunc: func(s string) error {
v, err := strconv.ParseBool(s)
if err != nil {
return err
}
*value = v
return nil
},
ValidateFunc: func(s string) error {
_, err := strconv.ParseBool(s)
return err
},
AllowedValuesFunc: func() []string {
return []string{sTrue, sFalse}
},
}
}
var ErrInvalidValue = errors.New("invalid value")
func RadioStringVar(value *string, name, descr, group string, choices []string) VarWrapper {
validateFunc := func(s string) error {
if !slices.Contains(choices, s) {
return fmt.Errorf("%w: %q", ErrInvalidValue, s)
}
return nil
}
return VarWrapper{
ItemName: name,
ItemDescr: descr,
ItemGroup: group,
ItemType: TRadio,
ValueFunc: func() string {
return *value
},
SetFunc: func(s string) error {
if err := validateFunc(s); err != nil {
return err
}
*value = s
return nil
},
ValidateFunc: validateFunc,
AllowedValuesFunc: func() []string {
return choices
},
}
}
func FilenameVar(value *string, name, descr, group string, mustexist bool) VarWrapper {
v := StringVar(value, name, descr, group)
v.ItemType = TFile
if mustexist {
v.ItemType = TFileExisting
}
return v
}
var (
sTrue = strconv.FormatBool(true)
sFalse = strconv.FormatBool(false)
)