combine.js

#!/usr/bin/env node

const fs = require('fs');
const path = require('path');

if (process.argv.length <= 4) {
    console.log('Usage: node index.js <input_directory> <source_file_extension> <output_directory> <output_file_extension>');
    process.exit(1);
}

const directoryPath = process.argv[2];
const sourceExtension = process.argv[3];
const outputDirectory = process.argv[4];
const outputExtension = process.argv[5];
const validExtensions = ['md', 'txt'];

if (!validExtensions.includes(sourceExtension) || !validExtensions.includes(outputExtension)) {
    console.error('Error: Invalid file extension. Valid extensions are:', validExtensions.join(', '));
    process.exit(1);
}

if (!fs.existsSync(directoryPath)) {
    console.error('Error: Input directory does not exist:', directoryPath);
    process.exit(1);
}

if (!fs.existsSync(outputDirectory)) {
    console.error('Error: Output directory does not exist:', outputDirectory);
    process.exit(1);
}

const currentDate = new Date();
const formattedDate = `${(currentDate.getMonth() + 1).toString().padStart(2, '0')}-${currentDate.getDate().toString().padStart(2, '0')}-${currentDate.getFullYear()}-${currentDate.getHours().toString().padStart(2, '0')}-${currentDate.getMinutes().toString().padStart(2, '0')}-${currentDate.getSeconds().toString().padStart(2, '0')}-${currentDate.getHours() >= 12 ? 'pm' : 'am'}`;
const outputFilePath = path.join(outputDirectory, `${formattedDate}-combined.${outputExtension}`);

const getAllFiles = (dirPath, arrayOfFiles, extension) => {
    let files = fs.readdirSync(dirPath);

    arrayOfFiles = arrayOfFiles || [];

    files.forEach(file => {
        if (fs.statSync(path.join(dirPath, file)).isDirectory()) {
            arrayOfFiles = getAllFiles(path.join(dirPath, file), arrayOfFiles, extension);
        } else {
            if (file.endsWith('.' + extension)) {
                arrayOfFiles.push(path.join(dirPath, file));
            }
        }
    });

    return arrayOfFiles;
}

let files = getAllFiles(directoryPath, [], sourceExtension);

let content = '';

files.forEach(filePath => {
    content += fs.readFileSync(filePath, 'utf8') + '\n';
});

fs.writeFileSync(outputFilePath, content);

console.log(`All .${sourceExtension} files have been combined into ${outputFilePath}`);

$ node combine.js ~/Dev/filament md ~/Desktop/ txt