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marcosc90/node-jsdifflib: A javascript library for diffing text and generating corresponding HTML views · GitHub

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node-jsdifflib

A diff library to compare text differences between two texts.

This is a fork of cemerick/jsdifflib which has been adapted to render the HTML on the server.

Installation

npm install node-jsdifflib

Overview

jsdifflib is a Javascript library that provides:

  1. A partial reimplementation of Python’s difflib module (specifically, the SequenceMatcher class)
  2. A visual diff view generator, that offers side-by-side as well as inline formatting of file data

API

diff(baseText, newText[, options])

options

  • baseTextName: [string] the title to be displayed above the base text listing in the diff view [default="Base Text"]
  • newTextName: [string] the title to be displayed above the new text listing in the diff view [default="New Text"]
  • contextSize: [int] the number of lines of context to show around differences; by default, all lines are shown
  • inline: [boolean] if false, a side-by-side diff view is generated (default); if true, an inline diff view is generated
  • colgroup: [object/boolean] whether to add colgroup tag to table [default = false]
    • th: [int] The width (%) of th elements (lines) [default=5]
    • td: [int] The width (%) of td elements (content) [default=45]

Style

jsdifflib comes with a ready to use CSS file (assets/jsdifflib.css) or you can use a custom one.

Example

const http = require("http");
const diff = require('node-jsdifflib');

const baseFile = "console.log(5);"
const newFile = "\"use strict\";\nconsole.log(5);";

http.createServer(function(req, res){ 
  
    if (req.url === '/favicon.ico') {
      res.writeHead(200, {'Content-Type': 'image/x-icon'} );
      return res.end();
    }

    var output = diff(baseFile, newFile);

    res.writeHead(200, {'Content-Type': 'text/html'});

    res.end(`<html>
      <head>
        <link rel="stylesheet" href="https://cdn.rawgit.com/marcosc90/node-jsdifflib/8838a6401c6933ca3faa1085bc1ec9b8174a6db8/assets/jsdifflib.css" />
      </head>
      <body>
        ${output}
      </body>
    </html>`);

}).listen(8081, function(){
  console.log("Server started at: http://localhost:8081");
});

License

BSD

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A javascript library for diffing text and generating corresponding HTML views

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