gowalker

package main

import (
	"fmt"
	"reflect"
	"time"

	"github.com/vkd/gowalker"
)

type visitedFields []string

func (f *visitedFields) Step(value reflect.Value, field reflect.StructField, fs gowalker.Fields) (set bool, err error) {
	key := gowalker.DashToLoverNamer.Key(fs.Names())
	*f = append(*f, key)
	return false, nil
}

func main() {
	var config struct {
		Name string
		Port int
		DB   struct {
			URL  string
			Port int
		}

		StartedAt time.Time
	}

	var fs visitedFields
	err := gowalker.Walk(&config, gowalker.MakeFields(2), &fs)
	fmt.Printf("fields: %v, %v", fs, err)
}

Output:

fields: [name port db-url db-port startedat], <nil>

package main

import (
	"fmt"
	"reflect"

	"github.com/vkd/gowalker"
	"github.com/vkd/gowalker/setter"
)

func main() {
	var q struct {
		Name    string   `uri:"name"`
		Age     int      `uri:"age"`
		Friends []string `uri:"friends"`
		Coins   []int    `uri:"coins"`
		Keys    []int
	}

	uri := map[string][]string{
		"name":    {"mike"},
		"friends": {"igor", "alisa"},
	}

	fk := gowalker.FieldKey("uri", gowalker.DefaultNamer)
	w := gowalker.WalkerFunc(func(value reflect.Value, field reflect.StructField, fs gowalker.Fields) (stop bool, _ error) {
		key := fk.FieldKey(field, fs)
		v, ok := uri[key]
		if !ok {
			return false, nil
		}
		return true, setter.SetSliceStrings(value, field, v)
	})
	err := gowalker.Walk(&q, gowalker.MakeFields(1), w)
	fmt.Printf("%+v, %v", q, err)
}

Output:

{Name:mike Age:0 Friends:[igor alisa] Coins:[] Keys:[]}, <nil>