const path = require('path');
const fs = require('fs');
const dir = path.join(__dirname, 'docs');

fs.readdir(dir, (err, files) => {
    if (err) 
        return console.log(`Unable to scan directory: ${dir}; ${err}`);
    //20190326-9120004734_20190314_2019326151232.xml1553612402
    const re = /.*-(.*)\.(xml|txt)(\d+)/;
    files.forEach(file => {        
        const m = re.exec(file);
        if (m) {
            const newName = `${m[1]}.${m[2]}`;
            console.log(`${file} => ${newName}`); 
            fs.renameSync(path.join(dir, file), path.join(dir, newName));
        } else {
            console.log('skipping:', file); 
        }        
    });
});