Add a binary interface

It reads markdown content from stdin and output only a section of it

README.md

@@ -1,24 +1,32 @@
 # markdown-extract
 
-A module on top of [chjj/marked](https://github.com/chjj/marked) to extract a paragraph from your markdown.
+A command line tool to extract a paragraph from a markdown content.
+
+## Usage
+
+```sh
+    cat README.md | md-extract <what> 
+```
 
 ## Installation
 Run the following commands to download and install the application:
 
 ```sh
-npm i markdown-extract --save
+npm i markdown-extract -g
 ```
 
-## Usage
+## API
+
+It also provide an api which provides more options than the binnary interface.
 
 ```js
     var mdExtract = require('markdown-extract')
 
     mdExtract ({type: /heading/, text: /Usage/, gnp: true}).join('\n')
 ```
 
-See more in the [test suite](https://github.com/maboiteaspam/markdown-extract/blob/master/test/index.js) a
-nd it s [markdown version](https://github.com/maboiteaspam/markdown-extract/blob/master/mocha.md).
+See more in the [test suite](https://github.com/maboiteaspam/markdown-extract/blob/master/test/index.js) 
+and it s [markdown version](https://github.com/maboiteaspam/markdown-extract/blob/master/mocha.md).
 
 ## Documentation
 

bin/md-extract.js

@@ -0,0 +1,16 @@
+#!/usr/bin/env node
+
+var byline = require('byline')
+var mdExtract = require('../index.js')
+
+var search = process.argv[2]
+
+var display = false
+byline(process.stdin).on('data', function (d){
+  if (display && !('' + d).match(/^[#]+/)) {
+    process.stdout.write(d + '\n')
+  }
+  if (('' + d).match(/^[#]+/)) {
+    display = !!('' + d).match(search)
+  }
+})

package.json

@@ -6,7 +6,9 @@
   "scripts": {
     "test": "mocha"
   },
-  "bin": {},
+  "bin": {
+    "md-extract": "./bin/md-extract.js"
+  },
   "keywords": [
     "To",
     "be",
@@ -22,7 +24,7 @@
     "url": "https://github.com/maboiteaspam/markdown-extract/issues"
   },
   "dependencies": {
-    "commander": "^2.8.1",
+    "byline": "^4.2.1",
     "marked": "^0.3.3",
     "underscore": "^1.8.3"
   },