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example_customflag_test.go
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example_customflag_test.go
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package fcli_test
import (
"encoding/json"
"flag"
"fmt"
"strings"
"github.com/berquerant/fcli"
)
type customJSONStruct struct {
World string `json:"world"`
Number int `json:"number"`
}
func (*customJSONStruct) UnmarshalFlag(v string) (fcli.CustomFlagUnmarshaller, error) {
var x customJSONStruct
if err := json.Unmarshal([]byte(v), &x); err != nil {
return nil, err
}
return &x, nil
}
type customStringSlice []string
func (customStringSlice) UnmarshalFlag(v string) (fcli.CustomFlagUnmarshaller, error) {
return customStringSlice(strings.Split(v, ",")), nil
}
type customStringZero string
func (customStringZero) UnmarshalFlag(v string) (fcli.CustomFlagUnmarshaller, error) {
return customStringZero(v), nil
}
func (customStringZero) FlagZero() fcli.CustomFlagUnmarshaller {
return customStringZero("ZERO")
}
func ExampleNewFlagFactory_customFlag() {
var (
jsonFlagF, _ = fcli.NewFlagFactory(new(customJSONStruct))
sliceFlagF, _ = fcli.NewFlagFactory(customStringSlice(nil))
zeroFlagF, _ = fcli.NewFlagFactory(customStringZero(""))
jsonFlag = jsonFlagF("j")
sliceFlag = sliceFlagF("s")
zeroFlag = zeroFlagF("z")
flagSet = flag.NewFlagSet("ff", flag.ContinueOnError)
)
jsonFlag.AddFlag(flagSet)
sliceFlag.AddFlag(flagSet)
zeroFlag.AddFlag(flagSet)
if err := flagSet.Parse([]string{"-j", `{"world":"fog","number":1}`, "-s", "sig,light,back"}); err != nil {
panic(err)
}
j, _ := jsonFlag.Unwrap()
s, _ := sliceFlag.Unwrap()
z, _ := zeroFlag.Unwrap()
fmt.Println(j.(*customJSONStruct).World)
fmt.Println(j.(*customJSONStruct).Number)
for _, x := range s.(customStringSlice) {
fmt.Println(x)
}
fmt.Println(z)
// Output:
// fog
// 1
// sig
// light
// back
// ZERO
}