js-chordpro/cli.js

ChordPro format parser

#!/usr/bin/env node

const fs = require('fs');
const { version } = require('./package.json');
const ArgumentParser = require('argparse').ArgumentParser
const Grammar = require('./src/grammar.js')
const FormatterAscii = require('./src/formatterAscii.js');
const FormatterHtml = require('./src/formatterHtml.js');

var argParser = new ArgumentParser({
    add_help: true,
    description: 'Tool for processing song lyrics stored in ChordPro format'
});

argParser.add_argument('files', {help: 'chordpro files to be processed', nargs: '+'});
argParser.add_argument('-f', {choices: ['text', 'html'], help: 'Output format', default: 'text'});
argParser.add_argument('-o', {help: 'Output file name (without extension), default output is stdout'})
argParser.add_argument('--version', { action: 'version', version });

var args = argParser.parse_args();

for (let f of args.files) {
    if (fs.existsSync(f)) {
        console.log(`Reading ${f}`);
        let fContent = fs.readFileSync(f, "utf8");

        // parse song from chordpro format
        let songDoc = Grammar.parse(fContent)

        // configure formatter
        let formatter
        switch(args.f) {
            case 'html':
                formatter = FormatterHtml;
                break;
            case 'text':
            default:
                formatter = FormatterAscii;
        }

        // format document
        let output = formatter.processSong(songDoc);

        // write output to file or console
        if (args.o) {
            fs.writeFileSync(args.o, output, "utf8");
        } else {
            console.log(output);
        }

    } else {
        console.error(`File ${f} doesn't exist`);
    }
}