index.js

#! /usr/bin/env node
const program = require("commander")
const copyPaste = require("copy-paste")
const Tesseract = require("tesseract.js")
const Progress = require("progress")
const PkgJson = require("./package.json")
const fs = require("fs");
const langs = ["afr", "ara", "aze", "bel", "ben", "ben", "bul", "cat", "ces", "chi_sim", "chi_tra", "chr", "dan", "deu", "ell", "eng", "enm", "epo", "epo_alt", "equ", "est", "eus", "fin", "fra", "frk", "frm", "glg", "grc", "heb", "hin", "hrv", "hun", "ind", "isl", "ita", "ita_old", "jpn", "kan", "kor", "lav", "lit", "mal", "mkd", "mlt", "msa", "nld", "nor", "pol", "por", "ron", "rus", "slk", "slv", "spa", "spa_old", "sqi", "srp", "swa", "swe", "tam", "tel", "tgl", "tha", "tur", "ukr", "vie"]

program
	.usage("PATH [options]")
	.description(PkgJson.description)
	.version(PkgJson.version)
	.option("-l, --lang [language]", "language of the text in the image.")
	.option("-c, --clean-up", "removes the generated language data file (.traineddata) after the image recognition job has finished")	
	.option("-p, --print", "prints out the text in the image.\n\nFull language list can be found here: \nhttps://github.com/naptha/tesseract.js/blob/master/docs/tesseract_lang_list.md")
	.parse(process.argv)

const errorMessage = validateArgs(program)
if (errorMessage) {
	console.error(`\n${errorMessage}`)
	program.help()
	return
}
recognize({
	imagePath: program.args[0], // file path
	lang: program.lang,
	printResult: program.print,
	cleanup: program.cleanUp,
})

function validateArgs(args) {
	if (!args.args.length || !args.args[0]){
		return "No Path Specified"
	}

	if (!fs.existsSync(args.args[0])) {
		return `File path not found: ${args.args[0]}`;
	}

	if (args.lang && langs.indexOf(args.lang) === -1) {
		return "Invalid Language!"
	}
	return null;
}

function recognize({ imagePath, lang = 'eng', printResult = false, cleanup = false }) {
	const bar = new Progress("recognizing [:bar] :percent :elapseds", {total: 100})
	let prev = 0
	Tesseract.recognize(imagePath, {
		lang,
		tessedit_create_txt: false,		
	})
	.progress(p => {
		const nextVal = Math.floor(p.progress * 100)
		if (nextVal && nextVal > prev) {
			bar.tick()
			prev++
		}
	})
	.catch(err => {
		console.log(err)
	})
	.then(result => {
		if (prev < 100) {
			bar.tick(100 - prev)
		}
		if (cleanup) {
			fs.unlinkSync(`${lang}.traineddata`)
		}
		copyPaste.copy(result.text, () => {
			if(printResult) {
				console.log("\nResult:\n" + result.text.slice(0, result.text.length - 1))				
			}
			console.log("Finished copying to clipboard!")
			process.exit()
		})
	})
}