Replace values

main.go

// Replace values takes two JSON files as inputs, it will replace the values of
// the keys of the first file using the values from the second. This is built
// for the first file to be a download of untranslated keys from Weblate, and
// the second file to be our language file.
//
// Given files keys.json:
//
//	{ "a": 1 }
//
// and values.json:
//
//	{ "a": 2, "b": 3 }
//
// Running:
//
//	replace-values keys.json values.json
//
// Would print:
//
//	"a",2
package main

import (
	"encoding/csv"
	"encoding/json"
	"flag"
	"log"
	"os"
	"strings"
)

func main() {
	flag.Parse()
	if err := run(); err != nil {
		log.Println(err)
	}
}

func run() error {
	keysFile, err := os.Open(flag.Arg(0))
	if err != nil {
		return err
	}
	valuesFile, err := os.Open(flag.Arg(1))
	if err != nil {
		return err
	}

	var keys map[string]string
	if err := json.NewDecoder(keysFile).Decode(&keys); err != nil {
		return err
	}

	var values map[string]any
	if err := json.NewDecoder(valuesFile).Decode(&values); err != nil {
		return err
	}

	for k := range keys {
		if before, after, ok := strings.Cut(k, "."); ok {
			keys[k] = values[before].(map[string]any)[after].(string)
		} else {
			keys[k] = values[k].(string)
		}
	}

	writer := csv.NewWriter(os.Stdout)
	for k, v := range keys {
		writer.Write([]string{k, v})
	}
	writer.Flush()

	if err := writer.Error(); err != nil {
		return err
	}

	return err
}