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‎README.md‎

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# html-differ [![Build Status](https://travis-ci.org/bem/html-differ.svg)](https://travis-ci.org/bem/html-differ) [![Coverage Status](https://img.shields.io/coveralls/bem/html-differ.svg)](https://coveralls.io/r/bem/html-differ?branch=master) [![Dependency Status](https://david-dm.org/bem/html-differ.svg)](https://david-dm.org/bem/html-differ)
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Сompares two ```html-files```.
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Сompares two `HTML` codes.
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## The comparison algorithm
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```html-differ``` compares files on the following criteria:
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`html-differ` compares `HTML` codes using the following criteria:
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1. Two respective attributes ```class``` are considered to be equal if they refer on same groups of ```CSS-styles```
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2. Two respective lists of attributes are considered to be equal even if they go in different order
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1. Two respective lists of attributes are considered to be equivalent even if they are specified in different order.
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2. Two respective attributes `class` are considered to be equivalent if they refer to the same groups of `CSS` styles.
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This code
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For example, the following two code samples will be considered to be equivalent:
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```html
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<html>
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</head>
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<body>
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<label>label for input</label>
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<input id="random" class="ab bc cd" for="blah">
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<input id="random" class="ab bc cd" tabIndex="1">
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</body>
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</html>
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```
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equals to
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```html
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<html>
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<head>
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<title>Test</title>
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</head>
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<body>
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<label>label for input</label>
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<input class=" cd ab bc" for="blah" id="random">
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<input class=" cd ab bc" tabIndex="1" id="random">
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</body>
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</html>
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```
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####html-differ####
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**html-differ.diffHtml**<br>
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**@param** *String* - the 1-st ```html-code```<br>
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**@param** *String* - the 2-nd ```html-code```<br>
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**@returns** *{Array of objects}* - see [here](https://github.com/kpdecker/jsdiff#change-objects)
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**@param** *{String}* - the 1-st `HTML` code<br>
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**@param** *{String}* - the 2-nd `HTML` code<br>
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**@returns** *{Array of objects}* - [array with diffs](https://github.com/kpdecker/jsdiff#change-objects) between `HTML` codes
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**html-differ.isEqual**<br>
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This method has the same parameters as the previous one, but returns ```Boolean```.
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**@param** *{String}* - the 1-st `HTML` code<br>
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**@param** *{String}* - the 2-nd `HTML` code<br>
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**@returns** *{Boolean}*
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####diff-logger####
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**diff-logger.getDiffText**<br>
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**@param** *{Object}* - the result of the work of the method ```html-differ.diffHtml```<br>
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**@param** *{Array of objects}* - the result of the work of the method `html-differ.diffHtml`<br>
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**@param** *{Object}* - options:<br>
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* the number of characters before the diff and after it<br>
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(for example, ```charsAroundDiff: 40```, default: ```40```)<br>
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* `charsAroundDiff: Number` - the number of characters before and after the diff result of two `HTML` codes (default: `40`).
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**@returns** *{String}* - diffs
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**diff-logger.log**<br>
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Pretty logging of diffs.<br>
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This method has the same parameters as the previous one.
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**@param** *{Array of objects}* - the result of the work of the method `html-differ.diffHtml`<br>
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**@param** *{Object}* - options:<br>
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* `charsAroundDiff: Number` - the number of characters before and after the diff result of two `HTML` codes (default: `40`).
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####Example####
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**@returns** - pretty logging of diffs:
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<img src='https://cloud.githubusercontent.com/assets/6376693/3648928/a6b9d48a-110d-11e4-8a07-d9b156145017.png'/>
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**Example**
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```js
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var fs = require('fs'),
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var options = {
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ignoreHtmlAttrs: [],
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compareHtmlAttrsAsJSON: [],
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ignoreWhitespace: true,
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ignoreWhitespaces: true,
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ignoreHtmlComments: true,
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bem: false
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}
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diffLogger.log(diff, { charsAroundDiff: 40 });
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```
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where ```options``` is the ```Object```:
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Where `options` is the `Object`:
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* **ignoreHtmlAttrs: [ Array ]**
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Sets what kind of respective attributes' content will be ignored during the comparison (default: `[]`).
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**Example**: `['id', 'for']`<br>
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The following two code samples will be considered to be equivalent:
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```html
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<label for="random">label for input</label>
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<input id="random">
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```
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```html
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<label for="sfsdfksdf">label for input</label>
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<input id="sfsdfksdf">
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```
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* ```ignoreHtmlAttrs: [ Array ]``` - sets what respective attributes are always considered to be equal
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* **compareHtmlAttrsAsJSON: [ Array ]**
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* ```compareHtmlAttrsAsJSON: [ Array ]``` - sets what respective attributes' content will be compared as ```JSONs```, not as ```Strings```
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Sets what kind of respective attributes' content will be compared as `JSON` objects, but not as strings (default: `[]`).
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**Example**: `['onclick']`<br>
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The following two code samples will be considered to be equivalent:
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```html
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<div onclick='return {"bla":{"first":"ololo","second":"trololo"}}'></div>
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```
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```html
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<div onclick='return {"bla":{"second":"trololo","first":"ololo"}}'></div>
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```
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* **ignoreWhitespaces: Boolean**
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Makes `html-differ` ignore whitespaces (spaces, tabs, new lines etc.) during the comparison (default: `true`).
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**Example**: `true`<br>
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The following two code samples will be considered to be equivalent:
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```html
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<html>Text Text<head lang="en"><title></title></head><body>Text</body></html>
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```
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```html
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<html>
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Text Text
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<head lang ="en">
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<title > </title>
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* ```ignoreWhitespace: Boolean``` - if is set ```true```, ```html-differ``` will consider all groups of ```spaces```, ```new lines```, ```tabs``` as one ```space```
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* ```bem: Boolean``` - predefined options for BEM
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</head>
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<body>
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Text
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</body>
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</html>
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```
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* **ignoreHtmlComments: Boolean**
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Makes `html-differ` ignore `HTML` comments during the comparison (default: `true`).
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**Example**: `true`<br>
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The following two code samples will be considered to be equivalent:
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```html
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<!DOCTYPE html>
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<!-- comments1 -->
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<html>
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<head lang="en">
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<meta charset="UTF-8">
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<title><!-- comments2 --></title>
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</head>
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<body>
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Text<!-- comments3 -->
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</body>
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</html>
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```
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```html
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<!DOCTYPE html>
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<html>
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<head lang="en">
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<meta charset="UTF-8">
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<title></title>
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</head>
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<body>
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Text
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</body>
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</html>
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```
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* **bem: Boolean**
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####For BEM####
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Options for BEM are predefined:
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* ```ignoreHtmlAttrs: ['id', 'for']```
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Sets predefined options for `BEM` (default: `false`).
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* ```compareHtmlAttrsAsJSON: ['data-bem', 'onclick', 'ondblclick']```
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**Example**: `true`
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* ```charsAroundDiff: 40```
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* `ignoreHtmlAttrs: ['id', 'for']`
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* `compareHtmlAttrsAsJSON: ['data-bem', 'onclick', 'ondblclick']`
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###As a program###
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```bash
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$ html-differ --help
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Compares two html-files
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Compares two HTML files
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Usage:
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html-differ [OPTIONS] [ARGS]
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Options:
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-h, --help : Help
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-v, --version : Shows the version number
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--config=CONFIG : Path to configuration JSON-file
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--config=CONFIG : Path to configuration JSON file
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--chars-around-diff=CHARSAROUNDDIFF : The number of characters around the diff (default: 40)
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Arguments:
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PATH1 : Path to the 1-st html-file (required)
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PATH2 : Path to the 2-nd html-file (required)
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PATH1 : Path to the 1-st HTML file (required)
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PATH2 : Path to the 2-nd HTML file (required)
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```
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####Example####
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**Example**
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```bash
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$ bin/html-differ path/to/html1 path/to/html2
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$ bin/html-differ --config=path/to/config path/to/html1 path/to/html2 --chars-around-diff=40
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$ bin/html-differ --config=path/to/config --chars-around-diff=40 path/to/html1 path/to/html2
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```
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####Configuration file###
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Study the following ```config.json```:
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Look at the following `config.json` file:
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```js
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{
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"ignoreHtmlAttrs": [],
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"compareHtmlAttrsAsJSON": [],
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"ignoreWhitespace": true,
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"ignoreWhitespaces": true,
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"ignoreHtmlComments": true,
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"bem": false
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}
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```

‎lib/cli.js‎

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module.exports = require('coa').Cmd()
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.name(process.argv[1])
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.helpful()
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.title('Compares two html-files')
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.title('Compares two HTML codes')
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.opt()
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.name('version')
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.title('Shows the version number')
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.end()
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.opt()
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.name('config')
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.title('Path to configuration JSON-file')
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.title('Path to configuration JSON file')
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.long('config')
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.end()
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.opt()
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.end()
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.arg()
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.name('path1')
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.title('Path to the 1-st html-file')
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.title('Path to the 1-st HTML file')
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.req()
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.end()
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.arg()
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.name('path2')
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.title('Path to the 2-nd html-file')
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.title('Path to the 2-nd HTML file')
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.req()
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.end()
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.act(function(opts, args) {

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