easyresources/lib/infrastructure/fileUtils.js

A library providing methods to easily generate json resource files from xlsx resource file

var 
    fs = require('fs'),
    Q = require('Q'),
    mkdirp = require('mkdirp');

var utils = function () {
    return {
        fileExists: fileExists,
        writeToFile: writeToFile,
        writeBufferToExistingFile: writeBufferToExistingFile,
        createDirectory: createDirectory
    };
    
    function writeBufferToExistingFile(filePath, buffer) {
        fs.open(filePath, 'w', function (err, fd) {
            if (err) {
                throw 'Error while opening the file: ' + err;
            }
            
            fs.write(fd, buffer, 0, buffer.length, null, function (err) {
                if (err) {
                    throw 'Error while writing file: ' + err;
                }
                
                fs.close(fd);
            });
        });
    }
    
    function writeToFile(path, data) {
        fs.writeFileSync(path, data);
    }
    
    function fileExists(fileName) {
        return fs.existsSync(fileName);
    }
    
    function createDirectory(dirPath) {
        var defer = Q.defer();
        
        if (!dirPath) {
            defer.rejectWithError('Failed to create directory. Directiry path is undefined');
            return defer.promise;
        }
        
        if (fs.existsSync(dirPath)) {
            fs.readdirSync(dirPath).forEach(function (file) {
                var curPath = dirPath + "/" + file;
                fs.unlinkSync(curPath);
            });

            defer.resolve();
        } else {
            mkdirp(dirPath, function (err) {
                if (err) {
                    defer.reject(err);
                } else {
                    defer.resolve();
                }
            });
        }
        
        return defer.promise;
    }
};

module.exports = utils();