Convert tab-splitted dictionaly to json

main.go

package main

import (
	"bufio"
	"encoding/json"
	"errors"
	"fmt"
	"os"
	"strings"
)

func run(path string) error {
	f, err := os.Open(path)
	if err != nil {
		return err
	}
	defer f.Close()

	s := bufio.NewScanner(f)

	dic := make(map[string]string)
	for s.Scan() {
		line := s.Text()
		words := strings.Split(line, "\t")
		if len(words) != 2 {
			return errors.New("syntax error: " + line)
		}
		dic[words[0]] = words[1]
	}
	err = s.Err()
	if err != nil {
		return err
	}
	return json.NewEncoder(os.Stdout).Encode(dic)
}

func main() {
	if len(os.Args) < 2 {
		fmt.Fprintln(os.Stderr, "Usage:", os.Args[0], "DICT_FILE")
		os.Exit(1)
	}
	err := run(os.Args[1])
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
}