Merge languages files (JSON) to inlang message format

merge.js

// Execute with `node merge.js`
// WARNING: This script does currently not support VariableReferences / variables in your text

import fs from "node:fs"
import path from "node:path"

const inputDirectory = "./" // Replace with your actual directory path
const outputFile = "messages.json"

const messages = {
	$schema: "https://inlang.com/schema/inlang-message-format",
	data: [],
}

// Read all files in the input directory
for (const file of fs.readdirSync(inputDirectory)) {
	const filePath = path.join(inputDirectory, file)

	if (fs.statSync(filePath).isFile() && file.endsWith(".json") && file !== outputFile) {
		const languageTag = file.replace(".json", "")

		// Read the JSON file
		const content = JSON.parse(fs.readFileSync(filePath, "utf-8"))

		// Iterate through each message in the file
		const flattenMessages = (obj, parentKey = "") => {
			let result = {}
			for (let key in obj) {
				const currentKey = parentKey ? `${parentKey}_${key}` : key
				if (typeof obj[key] === "object") {
					result = { ...result, ...flattenMessages(obj[key], currentKey) }
				} else {
					result[currentKey] = obj[key]
				}
			}
			return result
		}

		const flattenedContent = flattenMessages(content)

		for (const id in flattenedContent) {
			const existingMessage = messages.data.find((m) => m.id === id)

			if (existingMessage) {
				// Message with the same ID already exists, add a new variant
				existingMessage.variants.push({
					match: [],
					languageTag,
					pattern: [
						{
							type: "Text",
							value: flattenedContent[id],
						},
					],
				})
			} else {
				// Message does not exist, create a new message
				messages.data.push({
					id,
					selectors: [],
					variants: [
						{
							match: [],
							languageTag,
							pattern: [
								{
									type: "Text",
									value: flattenedContent[id],
								},
							],
						},
					],
				})
			}
		}
	}
}

// Write the merged messages to the output file
fs.writeFileSync(outputFile, JSON.stringify(messages, undefined, 2))

console.log(`Messages merged and saved to ${outputFile}`)