Small script that renames files with percent-encoded names (sometimes Curl downloads them)

decode.js

#!/usr/bin/nodejs

var fs = require('fs');
var util = require('util');

var decodeFiles = function(files) {
    util.puts('');
    var message = '\rRenaming... ';
    var count = files.length;
    files.forEach(function(file, index) {
        index += 1;
        util.print(message + index + '/' + count);
        fs.rename(file.old, file.new, function(err) {
            if (err) {
                util.puts('\n');
                throw err;
            }
        });
    });
    util.puts(message + ' \033[32mDone\033[0m');
};

var files = fs.readdirSync('.').map(function(filename) {
    var newFilename = decodeURIComponent(filename).replace(/\//g, '-');
    return filename == newFilename ? null : {old: filename, new: newFilename};
}).filter(Boolean);

// Here the interactivity starts

if (!files.length) {
    util.puts('Nothing to decode.');
    process.exit();
}

util.puts('The following files will be renamed:');
files.forEach(function(file) {
    util.puts('  "' + file.old + '"\n  -> "\033[34m' + file.new + '\033[0m"\n');
});

!function askToProceed() {
    var prompt = function() {
        util.print('Proceed (y/n)? ');
    };
    prompt();
    process.stdin.on('data', function(answer) {
        answer = String(answer).trim().toLowerCase();
        if (answer == 'y') {
            process.stdin.pause();
            decodeFiles(files);
        }
        else if (answer == 'n') {
            process.exit();
        }
        else {
            prompt();
        }
    });
    process.stdin.resume();
}();