wc

Node.js project

wc command ported to Node.js with additional features

Version: 0.0.1

The Unix wc command counts the number of bytes, characters, words and lines in a file but it lacks some useful features like walking a directory recursively and ignore paths. Also it has some issues with UTF8 encoded files.

Installation

npm install flavored-wc

npm install flavored-wc-native

A native version is also available. I made it just for fun but if you can, install it. The speed improvement depends on some factors: file size, files quantity, file content and the information to retrieve. You must also know that the JavaScript ⇄ C++ brige is pretty slow.

In general it's ok to say that the native implementation is faster than the javascript one. I've tested both implementations with a 10MB file and the native is twice as fast. The directory of this repository has been also tested with the following code and the native is four times faster.

//wc.js
var wc = require ("flavored-wc-native");
wc (".", function (){});

$ time node wc.js

Functions

• wc(path[, settings], callback) : undefined

wc(path[, settings], callback) : undefined
The path can be an String or an Array of Strings. These Strings can contain a valid path or text data.

The settings is an object that accepts the following settings. If the object is not provided all the information (bytes, chars, words and lines) will be counted.

• bytes - Boolean
  Set to true to count the number of bytes. Default is false.

• chars - Boolean
  Set to true to count the number of characters. Default is false. UTF8 multibyte characters are also allowed.

• words - Boolean
  Set to true to count the number of words. Default is false. A word is any consecutive sequence of characters separated by \r, \n, \v, \f, \t or space.

• lines - Boolean
  Set to true to count the number of lines. Default is false.

• data - Boolean
  If path contains text data, set this option to true. Default is false.

• ignore - String | Array | Function
  Paths to ignore. It can also be a function. The function is executed for each file and directory. It receives the path, the directory name, the name of the entry and a callback. The callback expects two parameters, a possible error and a boolean. If the boolean is true the path will be read, otherwise it will be ignored. The function acts like a filter, if you return false the path won't pass the filter.

  var wc = require ("flavored-wc");
    
  var settings = {
  	ignore: function (p, dirname, basename, cb){
  		cb (null, basename !== "ignored_path");
  	},
  	bytes: ...,
  	...
  };
    
  wc (".", settings, function (error, counters){
  	...
  });