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rtfpessoa/diff2html: Pretty diff to html javascript library (diff2html)

diff2html generates pretty HTML diffs from git diff or unified diff output.

Go to diff2html

Diff2Html can be used in various ways as listed in the distributions section. The two main ways are:

Below you can find more details and examples about each option.

diff2html accepts the text contents of a unified diff or the superset format git diff (https://git-scm.com/docs/git-diff) (not combined or word diff). To provide multiples files as input just concatenate the diffs (just like the output of git diff).

Simple wrapper to ease simple tasks in the browser such as: code highlight and js effects

Create a Diff2HtmlUI instance

constructor(target: HTMLElement, diffInput?: string | DiffFile[]) // diff2html-ui, diff2html-ui-slim
constructor(target: HTMLElement, diffInput?: string | DiffFile[], config: Diff2HtmlUIConfig = {}, hljs?: HighlightJS) // diff2html-ui-base

Generate and inject in the document the Pretty HTML representation of the diff

Enable extra features

synchronisedScroll(): void
fileListToggle(startVisible: boolean): void
highlightCode(): void
stickyFileHeaders(): void
Diff2HtmlUI Configuration Mandatory HTML resource imports 
<!-- CSS -->
<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/npm/diff2html/bundles/css/diff2html.min.css" />

<!-- Javascripts -->
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/diff2html/bundles/js/diff2html-ui.min.js"></script>
const targetElement = document.getElementById('destination-elem-id');
const configuration = { drawFileList: true, matching: 'lines' };

const diff2htmlUi = new Diff2HtmlUI(targetElement, diffString, configuration);
// or
const diff2htmlUi = new Diff2HtmlUI(targetElement, diffJson, configuration);

NOTE: The highlight.js css should come before the diff2html css

<!-- Stylesheet -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.8.0/styles/github.min.css" />
<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/npm/diff2html/bundles/css/diff2html.min.css" />

<!-- Javascripts -->
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/diff2html/bundles/js/diff2html-ui.min.js"></script>

Pass the option highlight with value true or invoke diff2htmlUi.highlightCode() after diff2htmlUi.draw().

document.addEventListener('DOMContentLoaded', () => {
  const diffString = `diff --git a/sample.js b/sample.js
  index 0000001..0ddf2ba
  --- a/sample.js
  +++ b/sample.js
  @@ -1 +1 @@
  -console.log("Hello World!")
  +console.log("Hello from Diff2Html!")`;
  const targetElement = document.getElementById('myDiffElement');
  const configuration = { drawFileList: true, matching: 'lines', highlight: true };
  const diff2htmlUi = new Diff2HtmlUI(targetElement, diffString, configuration);
  diff2htmlUi.draw();
  diff2htmlUi.highlightCode();
});

When using the auto color scheme, you will need to specify both the light and dark themes for highlight.js to use.

<link
  rel="stylesheet"
  href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.8.0/styles/github.min.css"
  media="screen and (prefers-color-scheme: light)"
/>
<link
  rel="stylesheet"
  href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.8.0/styles/github-dark.min.css"
  media="screen and (prefers-color-scheme: dark)"
/>
Collapsable File Summary List

Add the dependencies.

<!-- Javascripts -->
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/diff2html/bundles/js/diff2html-ui.min.js"></script>

Invoke the Diff2HtmlUI helper Pass the option fileListToggle with value true or invoke diff2htmlUi.fileListToggle() after diff2htmlUi.draw().

document.addEventListener('DOMContentLoaded', () => {
  const targetElement = document.getElementById('myDiffElement');
  var diff2htmlUi = new Diff2HtmlUI(targetElement, lineDiffExample, { drawFileList: true, matching: 'lines' });
  diff2htmlUi.draw();
  diff2htmlUi.fileListToggle(false);
});
Example with plain HTML+CSS+JS 
<!doctype html>
<html lang="en-us">
  <head>
    <meta charset="utf-8" />
    <!-- Make sure to load the highlight.js CSS file before the Diff2Html CSS file -->
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.7.1/styles/github.min.css" />
    <link
      rel="stylesheet"
      type="text/css"
      href="https://cdn.jsdelivr.net/npm/diff2html/bundles/css/diff2html.min.css"
    />
    <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/diff2html/bundles/js/diff2html-ui.min.js"></script>
  </head>
  <script>
    const diffString = `diff --git a/sample.js b/sample.js
index 0000001..0ddf2ba
--- a/sample.js
+++ b/sample.js
@@ -1 +1 @@
-console.log("Hello World!")
+console.log("Hello from Diff2Html!")`;

    document.addEventListener('DOMContentLoaded', function () {
      var targetElement = document.getElementById('myDiffElement');
      var configuration = {
        drawFileList: true,
        fileListToggle: false,
        fileListStartVisible: false,
        fileContentToggle: false,
        matching: 'lines',
        outputFormat: 'side-by-side',
        synchronisedScroll: true,
        highlight: true,
        renderNothingWhenEmpty: false,
      };
      var diff2htmlUi = new Diff2HtmlUI(targetElement, diffString, configuration);
      diff2htmlUi.draw();
      diff2htmlUi.highlightCode();
    });
  </script>
  <body>
    <div id="myDiffElement"></div>
  </body>
</html>
StimulusJS with TypeScript 
import { Controller } from '@hotwired/stimulus';

import { Diff2HtmlUI, Diff2HtmlUIConfig } from 'diff2html/lib/ui/js/diff2html-ui-slim.js';

// Requires `npm install highlight.js`
import 'highlight.js/styles/github.css';
import 'diff2html/bundles/css/diff2html.min.css';

export default class extends Controller {
  connect(): void {
    const diff2htmlUi = new Diff2HtmlUI(this.diffElement, this.unifiedDiff, this.diffConfiguration);

    diff2htmlUi.draw();
  }

  get unifiedDiff(): string {
    return this.data.get('unifiedDiff') || '';
  }

  get diffElement(): HTMLElement {
    return this.element as HTMLElement;
  }

  get diffConfiguration(): Diff2HtmlUIConfig {
    return {
      drawFileList: true,
      matching: 'lines',
    };
  }
}

JSON representation of the diff

function parse(diffInput: string, configuration: Diff2HtmlConfig = {}): DiffFile[];

Pretty HTML representation of the diff

function html(diffInput: string | DiffFile[], configuration: Diff2HtmlConfig = {}): string;

The HTML output accepts a Javascript object with configuration. Possible options:

Import the stylesheet and the library code.

To load correctly in the Browser you need to include the stylesheet in the final HTML.

<!-- CSS -->
<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/npm/diff2html/bundles/css/diff2html.min.css" />

<!-- Javascripts -->
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/diff2html/bundles/js/diff2html.min.js"></script>

It will now be available as a global variable named Diff2Html.

document.addEventListener('DOMContentLoaded', () => {
  var diffHtml = Diff2Html.html('<Unified Diff String>', {
    drawFileList: true,
    matching: 'lines',
    outputFormat: 'side-by-side',
  });
  document.getElementById('destination-elem-id').innerHTML = diffHtml;
});
Diff2Html NPM / Node.js Library 
const Diff2html = require('diff2html');
const diffJson = Diff2html.parse('<Unified Diff String>');
const diffHtml = Diff2html.html(diffJson, { drawFileList: true });
console.log(diffHtml);
import * as Diff2Html from 'diff2html';
import { Component, OnInit } from '@angular/core';

export class AppDiffComponent implements OnInit {
  outputHtml: string;
  constructor() {
    this.init();
  }

  ngOnInit() {}

  init() {
    let strInput =
      '--- a/server/vendor/golang.org/x/sys/unix/zsyscall_linux_mipsle.go\n+++ b/server/vendor/golang.org/x/sys/unix/zsyscall_linux_mipsle.go\n@@ -1035,6 +1035,17 @@ func Prctl(option int, arg2 uintptr, arg3 uintptr, arg4 uintptr, arg5 uintptr) (\n \n // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n \n+func Pselect(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timespec, sigmask *Sigset_t) (n int, err error) {\n+\tr0, _, e1 := Syscall6(SYS_PSELECT6, uintptr(nfd), uintptr(unsafe.Pointer(r)), uintptr(unsafe.Pointer(w)), uintptr(unsafe.Pointer(e)), uintptr(unsafe.Pointer(timeout)), uintptr(unsafe.Pointer(sigmask)))\n+\tn = int(r0)\n+\tif e1 != 0 {\n+\t\terr = errnoErr(e1)\n+\t}\n+\treturn\n+}\n+\n+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n+\n func read(fd int, p []byte) (n int, err error) {\n \tvar _p0 unsafe.Pointer\n \tif len(p) > 0 {\n';
    let outputHtml = Diff2Html.html(strInput, { drawFileList: true, matching: 'lines' });
    this.outputHtml = outputHtml;
  }
}
<!doctype html>
<html>
  <head>
    <title>diff2html</title>
  </head>
  <body>
    <div [innerHtml]="outputHtml"></div>
  </body>
</html>
"styles": [
  "diff2html.min.css"
]
<template>
  <div v-html="prettyHtml" />
</template>

<script>
import * as Diff2Html from 'diff2html';
import 'diff2html/bundles/css/diff2html.min.css';

export default {
  data() {
    return {
      diffs:
        '--- a/server/vendor/golang.org/x/sys/unix/zsyscall_linux_mipsle.go\n+++ b/server/vendor/golang.org/x/sys/unix/zsyscall_linux_mipsle.go\n@@ -1035,6 +1035,17 @@ func Prctl(option int, arg2 uintptr, arg3 uintptr, arg4 uintptr, arg5 uintptr) (\n \n // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n \n+func Pselect(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timespec, sigmask *Sigset_t) (n int, err error) {\n+\tr0, _, e1 := Syscall6(SYS_PSELECT6, uintptr(nfd), uintptr(unsafe.Pointer(r)), uintptr(unsafe.Pointer(w)), uintptr(unsafe.Pointer(e)), uintptr(unsafe.Pointer(timeout)), uintptr(unsafe.Pointer(sigmask)))\n+\tn = int(r0)\n+\tif e1 != 0 {\n+\t\terr = errnoErr(e1)\n+\t}\n+\treturn\n+}\n+\n+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT\n+\n func read(fd int, p []byte) (n int, err error) {\n \tvar _p0 unsafe.Pointer\n \tif len(p) > 0 {\n',
    };
  },
  computed: {
    prettyHtml() {
      return Diff2Html.html(this.diffs, {
        drawFileList: true,
        matching: 'lines',
        outputFormat: 'side-by-side',
      });
    },
  },
};
</script>
1. Out of memory or Slow execution

This is a developer friendly project, all the contributions are welcome. To contribute just send a pull request with your changes following the guidelines described in CONTRIBUTING.md. I will try to review them as soon as possible.

Thanks goes to these wonderful people (emoji key):

This project follows the all-contributors specification. Contributions of any kind welcome!

Copyright 2014-present Rodrigo Fernandes. Released under the terms of the MIT license.

This project is inspired in pretty-diff by Scott González.

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