javaproperties.go

package main

import (
	"fmt"
	"strings"
)

var (
	app = `db.username=hello
db.password=world
kafka.properties=&user.name=kafka&brokers=127.0.0.1`
)

func splitProperties(str string) map[string]string {
	sep := "="
	res := make(map[string]string, 0)
	s := strings.Split(app, "\n")
	for _, p := range s {
		splits := strings.Split(p, sep)
		if len(splits) >= 0 {
			key := splits[0]
			value := strings.Join(splits[1:], sep)
			res[key] = value
		}
	}
	return res
}

func mergeProperties(first, second str) string {
  if second == "" {
   return first
  }
  
  if first == ""  {
   return second 
  }
  
  firstProps := splitProperties(first)
  secondProps := splitProperties(second)
  
  for k, v := range secondProps {
    firstProps[k] = v
  }
  
  return joinProperties(firstProps)
}

func joinProperties(m map[string]string) string {
	res := make([]string, 0)
	for k, v := range m {
		res = append(res, fmt.Sprintf("%s=%s", k, v))
	}
	return strings.Join(res, "\n")
}

func main() {
	// fmt.Println(app)
	props := splitProperties(app)
	for k, v := range props {
		fmt.Printf("Key: %s, Value: %s\n", k, v)
	}

	fmt.Println(joinProperties(props))
}