node 文件操作

对文件的各种操作，使用姿势如下

文件操作单例
 @example

 fu.exist(file); //是否存在
 fu.copy(file, 'new-path'); //复制到某个新目录
 fu.move(file, 'new-path'); //移动到某个新目录
 fu.rename(file, 'new-name');
 fu.delete(file); //删除文件或文件夹

 fu.mkdir(src); //创建目录
 fu.touch(my-file-name); //创建文件

 fu.write(my-file-name, data); //写入内容
 fu.append(my-file-name, append_data); //追加内容
 fu.read(my-file-name); //读取内容

 fu.type(my-file-name); //类型

 fu.extname(my-file-name); //文件后缀, 带.
 fu.extname(my-file-name); //文件后缀，不带.

 fu.copy('tmp', 'tmp2'); //复制文件或者文件夹tmp中的文件到目录tmp2
 fu.move('tmp', 'tmp2'); //移动文件或者文件夹tmp中的文件到文件夹tmp2

 fu.each(src, function(item){
      console.log('遍历文件');    
    });

 //异步的方式遍历
 var options = {
      sync: false,
      matchFunction: function(itm){
        return item.name.match(/.css$/i);
      }
    }
 var onComplete = function(){
      console.log('遍历完成');
    }
 fu.each(src, function(item), options, onComplete);

在node中通过require('fu.js')即可，源码如下：

/**
 * Created by Sorrow.X on 2017/6/16.
 */
const fs = require('fs');
const path = _path = require('path');
const util = require('util');

let isWindows = !!process.platform.match(/^win/);
let wrench = {
    // 同步递归创建目录
    mkdirSyncRecursive: function (path, mode) {
        path = _path.normalize(path);
        let self = this;
        try {
            fs.mkdirSync(path, mode);
        } catch (err) {
            if (err.code == "ENOENT") {
                let slashIdx = path.lastIndexOf(_path.sep);

                if (slashIdx > 0) {
                    let parentPath = path.substring(0, slashIdx);
                    self.mkdirSyncRecursive(parentPath, mode);
                    self.mkdirSyncRecursive(path, mode);
                } else {
                    throw err;
                };
            } else if (err.code == "EEXIST") {
                return;
            } else {
                throw err;
            };
        };
    },

    // 同步递归删除目录
    rmdirSyncRecursive: function (path, failSilent) {
        let files;
        let self = this;
        try {
            files = fs.readdirSync(path);
        } catch (err) {
            if (failSilent) return;
            throw new Error(err.message);
        };

        /*  Loop through and delete everything in the sub-tree after checking it */
        for (var i = 0; i < files.length; i++) {
            var file = _path.join(path, files[i]);
            var currFile = fs.lstatSync(file);

            if (currFile.isDirectory()) {
                // Recursive function back to the beginning
                self.rmdirSyncRecursive(file);
            } else if (currFile.isSymbolicLink()) {
                // Unlink symlinks
                if (isWindows) {
                    fs.chmodSync(file, 666) // Windows needs this unless joyent/node#3006 is resolved..
                };
                fs.unlinkSync(file);
            } else {
                // Assume it's a file - perhaps a try/catch belongs here?
                if (isWindows) {
                    fs.chmodSync(file, 666) // Windows needs this unless joyent/node#3006 is resolved..
                };
                fs.unlinkSync(file);
            };
        };

        /*  Now that we know everything in the sub-tree has been deleted, we can delete the main
         directory. Huzzah for the shopkeep. */
        return fs.rmdirSync(path);
    },

    // 同步拷贝文件
    copyFile: function (src, dest) {
        let len = 64 * 1024;
        let buff = new Buffer(len);
        let fdr = fs.openSync(src, 'r');
        let fdw = fs.openSync(dest, 'w');
        let bytesRead = 1;
        let pos = 0;
        while (bytesRead > 0) {
            bytesRead = fs.readSync(fdr, buff, 0, len, pos);
            fs.writeSync(fdw, buff, 0, bytesRead);
            pos += bytesRead;
        }
        fs.closeSync(fdr);
        fs.closeSync(fdw);
    }
};

// 判断fn是否是函数
let isFunction = function (fn) {
    return Object.prototype.toString.call(fn) == '[object Function]';
};

// 判断str是否是字符串
let isString = function (str) {
    return Object.prototype.toString.call(str) == '[object String]';
};

/**
 文件操作单例
 @example

 fu.exist(file); //是否存在
 fu.copy(file, 'new-path'); //复制到某个新目录
 fu.move(file, 'new-path'); //移动到某个新目录
 fu.rename(file, 'new-name');
 fu.delete(file); //删除文件或文件夹

 fu.mkdir(src); //创建目录
 fu.touch(my-file-name); //创建文件

 fu.write(my-file-name, data); //写入内容
 fu.append(my-file-name, append_data); //追加内容
 fu.read(my-file-name); //读取内容

 fu.type(my-file-name); //类型

 fu.extname(my-file-name); //文件后缀, 带.
 fu.extname(my-file-name); //文件后缀，不带.

 fu.copy('tmp', 'tmp2'); //复制文件或者文件夹tmp中的文件到目录tmp2
 fu.move('tmp', 'tmp2'); //移动文件或者文件夹tmp中的文件到文件夹tmp2

 fu.each(src, function(item){
      console.log('遍历文件');    
    });

 //异步的方式遍历
 var options = {
      sync: false,
      matchFunction: function(itm){
        return item.name.match(/.css$/i);
      }
    }
 var onComplete = function(){
      console.log('遍历完成');
    }
 fu.each(src, function(item), options, onComplete);
 **/
let FileUtil = (function () {

    // 属性
    function F() { };

    // 方法
    F.prototype = {
        constructor: F,

        /**
         判断某个或某些文件(夹)是否存在
         @method exist
         @param {String} f 一个文件(夹)名称
         @return Boolean 文件是否存在
        **/
        exist: function (f) {
            return fs.existsSync(f);
        },

        /**
         是否是文件
         @method isFile
         @static
         @param {String} f 文件名称
         @return Boolean 是否是文件
        **/
        isFile: function (f) {
            return this.exist(f) && fs.statSync(f).isFile();
        },

        /**
         是否是文件夹
         @method isDirectory
         @static
         @param {String} f 文件名称
         @return Boolean 是否是文件夹
        **/
        isDirectory: function (f, dir) {
            return this.exist(f) && fs.statSync(f).isDirectory();
        },

        /**
         @method extname
         @param {String} f 文件名称
         @param {String} (optional) withDot 是否带上.
         @return String 文件后缀
         @example
         console.log(fu.extname('image.jpg')); // jpg
        **/
        extname: function (f, withDot) {
            var extname = path.extname(f);
            if (!withDot && extname && extname.charAt(0) == '.') {
                return extname.substr(1);
            }
            return extname;
        },

        /**
         创建目录
         @method mkdir
         @param {String|Array} f 一个或多个文件夹
         @param {Number} permission 文件权限
         @example
         fu.mkdir('model');
         fu.mkdir(['view', 'controller']);
         fu.mkdir('mydir', 0775);
        **/
        mkdir: function (f, permission) {
            if (util.isArray(f)) {
                var self = this;
                f.forEach(function (item) {
                    self.mkdir(item, permission);
                })
            } else {
                if (!this.exist(f)) {
                    wrench.mkdirSyncRecursive(f, permission || 0777);
                }
            }
        },

        /**
         创建文件
         @method touch
         @param {String|Array} f 一个或多个文件
         @param {int} (optional)[0777] permission 文件权限
         @param {String} (optional) data 文件内容
         @example
         fu.touch('README.md');
         fu.touch('app.js', 0777);
         fu.touch(['view/view.js', 'model/model.js']);
         fu.touch('app.js', 0777, 'window.app = (function(){ return "app" })()');
        **/
        touch: function (f, permission, data) {
            if (util.isArray(f)) {
                var self = this;
                f.forEach(function (item) {
                    self.touch(item, permission);
                })
            } else {
                data = data || '';
                this.mkdir(path.dirname(f));
                this.write(f, data);
            }
        },

        /**
         删除文件或文件夹
         @method delete
         @param {String|Array} f 一个或多个文件或文件夹
         @example
         fu.delete('/var/www/tmp/data/one.txt');
         fu.delete('/var/www/tmp/data/')
        **/
        delete: function (f) {
            if (util.isArray(f)) {
                var self = this;
                f.forEach(function (item) {
                    self.delete(item);
                })
            } else {
                if (this.exist(f)) {
                    if (this.isDirectory(f)) {
                        wrench.rmdirSyncRecursive(f, true);
                    } else {
                        fs.unlinkSync(f);
                    }
                }
            }
        },

        /**
         读取文件内容
         @method read
         @param {String} f 文件名
         @param {String} (optional) encoding 编码，默认`utf-8`
         @example
         fu.read('文件名');
        **/
        read: function (f, encoding) {
            return fs.readFileSync(f, encoding || 'utf-8');
        },

        /**
         写入内容到文件 (会覆盖以前的内容)
         @method read
         @param {String} f 文件名
         @param {String} data 文件内容
         @param {String} (optional) encoding 编码，默认`utf-8`
         @example
         fu.write('README.md', '你的数据');
        **/
        write: function (f, data, encoding) {
            return fs.writeFileSync(f, data, encoding || 'utf-8');
        },

        /**
         追加内容到文件
         @method append
         @static
         @param {String} f 文件名
         @param {String} data 文件内容
         @param {String} (optional) encoding 编码，默认`utf-8`
         @example
         fu.append('README.md', '你的数据');
        **/
        append: function (f, data, encoding) {
            return fs.appendFileSync(f, data, encoding);
        },

        /**
         更改名称
         @method rename
         @param {String} name 文件名
         @param {String} (optional) newName 新的文件名
         @example
         fu.rename('app.js', 'app_bak.js');
         fu.rename('app.js', '/usr/local/bak/app.js');
        **/
        rename: function (name, newName) {
            this.mkdir(path.dirname(newName));
            fs.renameSync(name, newName);
        },

        /**
         移动文件或文件夹中的文件到新的目录(移动完可以重命名)
         @method move
         @param {String|Array} f 一个或多个文件
         @param {String} target 目标文件目录
         @param {String} (optional) filter_or_newName 过滤正则或者过滤函数或者新名称
         @example
         //移动js文件
         fu.move(fu.list(src), targetDir, /.js$/i);
         fu.move(fu.list(src), targetDir, function(f) {
             return f.match(/.js$/i);
         });
         //移动并且改名
         fu.move('src/app.js', 'dest', 'app-min.js');
        **/
        move: function (f, target, filter_or_newName) {
            var self = this;
            var isValid = function (item) {
                if (self.isDirectory(item)) {
                    return true;
                };
                if (filter_or_newName) {
                    if (util.isRegExp(filter_or_newName)) {
                        return filter_or_newName.test(item);
                    } else if (isFunction(filter_or_newName)) {
                        return filter_or_newName(item);
                    };
                };
                return true;
            };
            if (util.isArray(f)) {
                f.forEach(function (item) {
                    self.move(item, target);
                });
            } else {
                var name;
                if (!isValid(f)) {
                    return;
                };
                if (filter_or_newName && isString(filter_or_newName)) {
                    name = filter_or_newName;
                    filter_or_newName = null;
                } else {
                    name = path.basename(f);
                };
                var newName = path.normalize(target + path.sep + name);

                try {
                    //如果是文件
                    if (this.isFile(f)) {
                        this.rename(f, newName);
                    };
                    //如果没有过滤参数
                    if (!filter_or_newName) {
                        return this.rename(f, target);
                    };

                    //可能有过滤，被过滤掉的文件不能被移动
                    var deleteList = [];
                    this.each(f, function (item) {
                        var dir, t;
                        if (item.directory) {
                            dir = path.relative(f, item.name);
                            t = path.normalize(target + path.sep + dir);
                            self.mkdir(t);
                            deleteList.push(item.name);
                        } else {
                            dir = path.dirname(path.relative(f, item.name))
                            t = path.normalize(target + path.sep + dir);
                            self.move(item.name, t, filter_or_newName);
                        };
                    }, {
                        matchFunction: function (item) {
                            return isValid(item.name);
                        }
                    });

                    deleteList.forEach(function (item) {
                        self.delete(item);
                    });
                    self.delete(f);

                } catch (err) {
                    if (this.isFile(f)) {
                        this.copy(f, target, filter_or_newName);
                        this.delete(f);
                    } else if (this.isDirectory(f)) {
                        this.copy(f, target, filter_or_newName);
                        this.delete(f);
                    };
                };
            };
        },

        /**
         复制文件或文件夹中的文件到新的目录(复制完可以重命名)
         @method copy
         @param {String|Array} f 一个或多个文件
         @param {String} target 目标文件目录
         @param {String} (optional) filter_or_newName 过滤正则或者过滤函数或者新名称
         @example
         //拷贝js文件
         fu.copy(fu.list(src), targetDir, /.js$/i);
         fu.copy(fu.list(src), targetDir, function(f){
             return f.match(/.js$/i);
         });
         //拷贝并且改名
         fu.copy('src/app.js', 'dest', 'app-min.js');
        **/
        copy: function (f, target, filter_or_newName) {
            var self = this;
            var isValid = function (item) {
                if (self.isDirectory(item)) {
                    return true;
                };
                if (filter_or_newName) {
                    if (util.isRegExp(filter_or_newName)) {
                        return filter_or_newName.test(item);
                    } else if (isFunction(filter_or_newName)) {
                        return filter_or_newName(item);
                    };
                };
                return true;
            };
            if (util.isArray(f)) {
                f.forEach(function (item) {
                    // self.copy(item, dir);
                    self.copy(item, target);
                });
            } else {
                var name;
                if (!isValid(f)) {
                    return;
                };
                if (filter_or_newName && isString(filter_or_newName)) {
                    name = filter_or_newName;
                    filter_or_newName = null;
                } else {
                    name = path.basename(f);
                };

                var newName = path.normalize(target + path.sep + name);

                if (this.isFile(f)) {
                    this.mkdir(path.dirname(newName));
                    wrench.copyFile(f, newName);
                } else if (this.isDirectory(f)) {
                    this.each(f, function (item) {
                        var dir, t;
                        if (!item.directory) {
                            dir = path.dirname(path.relative(f, item.name));
                            t = path.normalize(target + path.sep + dir);
                            self.copy(item.name, t, filter_or_newName);
                        };
                    });
                };
            };
        },

        /**
         遍历目录下的文件和文件夹
         @method each
         @static
         @param {String} dir 目录
         @param {Function} callback 遍历时的回调函数
         @param {Object} options 过滤参数
         @param {Boolean} options.recursive 是否遍历子文件夹，默认true
         @param {Boolean} options.excludeFile 是否屏蔽文件
         @param {Boolean} options.excludeDirectory 是否屏蔽文件夹
         @param {Boolean} options.sync 是否异步，默认同步
         @param {Function} options.matchFunction 匹配函数
         @param {Function} (optional) onComplete 完成文件遍历的回调函数
         @example
         // 同步遍历
         fu.each('src', function(item){
            console.log(item);
         }, {
             excludeDirectory: true,
             matchFunction: function(item){
                 return item.filename.match(/.js/i);
             }
         });

         //以异步方式调用
         fu.each('src', function(item){
             console.log(item.filename);
         }, { sync: false}, function(){
             console.log('读取完毕')
         });
        **/
        each: function (dir, callback, options, onComplete) {
            options = options || {};
            dir = dir.replace(/(/+)$/, '');

            let self = this;
            let sync = options.sync != undefined ? options.sync : true;
            let excludeFile = options.excludeFile;
            let excludeDirectory = options.excludeDirectory;
            let matchFunction = options.matchFunction;
            let breakFunction = options.breakFunction;
            let preventRecursiveFunction = options.preventRecursiveFunction;
            let recursive = true;
            let checkCount = 0;
            let p, i, l;

            var onFinished = function () {
                if (checkCount <= 0 && onComplete) {
                    onComplete();
                };
            };

            if (options.recursive === false) {
                recursive = false;
            };

            if (!this.isDirectory(dir)) {
                onFinished();
                return [];
            };

            var handleItem = function (filename) {
                var name = dir + path.sep + filename;
                var isDir = self.isDirectory(name);
                var info = {
                    directory: isDir,
                    name: name,
                    filename: filename
                };

                if (isDir) {
                    if (recursive) {
                        if (!preventRecursiveFunction || !preventRecursiveFunction(info)) {
                            checkCount++;
                            self.each(name, callback, options, function () {
                                checkCount--;
                                onFinished();
                            });
                        };
                    };

                    if (!excludeDirectory) {
                        if (!matchFunction || (matchFunction && matchFunction(info))) {
                            callback(info);
                        };
                    };
                } else if (self.isFile(name)) {
                    if (!excludeFile) {
                        if (!matchFunction || (matchFunction && matchFunction(info))) {
                            callback(info);
                        };
                    };
                };
                checkCount--;
                onFinished();
            };
            if (sync) {
                p = fs.readdirSync(dir);
                p.forEach(handleItem);
                checkCount = 0;
                onFinished();
            } else {
                fs.readdir(dir, function (e, arr) {
                    if (e) {
                        onFinished();
                    } else {
                        checkCount = arr.length;
                        onFinished();
                        arr.forEach(function (item) {
                            handleItem(item);
                        });
                    };
                });
            };
        },

        /**
         列出目录下的文件和文件夹
         @method list
         @static
         @param {String} dir 目录
         @param {Object} options 过滤参数
         @param {Boolean} options.recursive 是否遍历子文件夹，默认true
         @param {Boolean} options.excludeFile 是否屏蔽文件
         @param {Boolean} options.excludeDirectory 是否屏蔽文件夹
         @param {Function} options.breakFunction 终止函数
         @param {Function} options.matchFunction 匹配函数
         @param {Boolean} fullView 是否返回更完整的文件信息
         @return Array 文件和文件夹信息
         @example
         //列出所有js文件
         var list = fu.list('aa', {
             excludeDirectory: true,
             matchFunction: function(item){
                 return item.filename.match(/.js$/i);
             }
         });
         console.log(list);  //list = ['a.js', 'b/c.js', ...]

         //列出所有js文件，包含完整信息
         var list = fu.list('aa', {
             excludeDirectory: true,
             matchFunction: function(item){
                 return item.filename.match(/.js$/i);
             }
         }, true);
         console.log(list);
        **/
        list: function (dir, options, fullView) {
            let result = [];
            options = options || {};
            options.sync = true;
            this.each(dir, function (item) {
                if (fullView) {
                    result.push(item);
                } else {
                    result.push(item.name);
                }
            }, options);
            return result;
        }
    };

    //实例容器
    let instance;

    let _static = {
        name: 'FileUtil',

        //获取实例的方法
        //返回F的实例
        getInstance: function (args) {
            if (instance === undefined) {
                instance = new F(args);
            };
            return instance;
        }
    };
    return _static;
})();

let fu = FileUtil.getInstance();

module.exports = fu;

很实用的文件操作库。