Rename files

rename.js

const fs = require('fs')
const path = require('path')
const readline = require("readline");
const rl = readline.createInterface({
	input: process.stdin,
	output: process.stdout
});
const homedir = require('os').homedir()
const defaultInputFolder = path.join(homedir, 'Desktop', 'ImageRename')
const defaultOutputFolder = path.join(homedir, 'Desktop', 'ImageRenameOutput')

rl.question(`Input folder: [${defaultInputFolder}] `, function (userFolder) {
	const inputFolder = userFolder || defaultInputFolder
	fs.readdir(inputFolder, (err, contents) => {
		console.log(`Found ${contents.length} files `)
		if (err) {
			console.log(err)
			process.exit(1)
		}
		const numParse = /.*(\d+).*/
		const numbers = contents
			.map((filePath) => {
				const match = numParse.exec(path.basename(filePath))
				return match
					? { filePath: path.join(inputFolder, filePath), value: parseInt(match[1]) }
					: { filePath: path.join(inputFolder, filePath), value: 0 }
			})
			.sort((a, b) => b.value - a.value)

		if (numbers.length === 0) {
			console.log('no input files')
		}

		rl.question("Mode: [R,G,B]: ", function (modeInputUser) {
			const modeInput = modeInputUser || "R,G,B"
			const mode = modeInput.split(',').map(x => x.trim())
			rl.question(`Output folder: [${defaultOutputFolder}]: `, function (outputFolderInput) {
				const outputFolder = outputFolderInput || defaultOutputFolder
				if (!fs.existsSync(outputFolder)){
					console.log(`Output doesn't exist. Creating ${outputFolder}`)
					fs.mkdirSync(outputFolder);
				}
				rl.question("Output files: [Image-%N-%M.jpg]: ", function (output) {
					const outputMask = output || "Image-%N-%M.jpg"
					let modeIndex = 0
					let currentN = 1
					numbers.forEach(number => {
						const outputFile = path.join(outputFolder, outputMask
							.replace('%M', `${mode[modeIndex]}`)
							.replace('%N', `${currentN}`))
						fs.copyFileSync(number.filePath, outputFile)
						console.log(outputFile)
						modeIndex++
						if (modeIndex === mode.length) {
							modeIndex = 0
							currentN++
						}
					})
					console.log(`Done. All files created in ${outputFolder}`)
					rl.close()
				})
			})
		})
	})
})