How Do I Make A Tampermonkey Userscript Replace Words In Text Files?

6 years ago I asked a question about rewriting text files displayed in a browser using greasemonkey. Can I Make Greasmonkey Scripts Run On Text Files?

I am now coming back to a similar problem and I tried to paste it in to Tampermonkey but it doesn't replace the text.

What am I doing wrong here?

// ==UserScript==
// @name         Rewrite LLVM License
// @namespace    http://tampermonkey.net/
// @version      0.1
// @match        http://llvm.org/releases/2.8/*
// @include      http://llvm.org/releases/2.8/LICENSE.TXT
// @require      http://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js
// @grant        none
// ==/UserScript==

(function() {
    //Just to tell the linter that $ is defined in jquery
    /* global $ */

    //Browsers display text in a pre tag
    var pageTextNd=$("body > pre");

    //Replace the text LLVM
    var newPageTxt=pageTextNd.text().replace("LLVM", "Ernst Blofeld");

    //Rewrite the page
    pageTextNd.text(newPageTxt);
})();

Solution

It looks like the page you're interested in redirects to:

https://releases.llvm.org/2.8/LICENSE.TXT

so that's what you need to set your @include or @match to.

You also want to replace all instances of LLVM, so use .replaceAll:

// ==UserScript==
// @name         Rewrite LLVM License
// @include      https://releases.llvm.org/2.8/LICENSE.TXT
// @require      http://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js
// @grant        none
// ==/UserScript==

(function() {
    //Just to tell the linter that $ is defined in jquery
    /* global $ */

    //Browsers display text in a pre tag
    var pageTextNd=$("body > pre");

    //Replace the text LLVM
    var newPageTxt=pageTextNd.text().replaceAll("LLVM", "Ernst Blofeld");

    //Rewrite the page
    pageTextNd.text(newPageTxt);
})();

If you don't want to rely on replaceAll, use a regular expression with .replace instead: /LLVM/g.

It seems quite strange to rely on jQuery for something this trivial though - you can very easily accomplish this without a library:

// ==UserScript==
// @name         Rewrite LLVM License
// @include      https://releases.llvm.org/2.8/LICENSE.TXT
// @grant        none
// ==/UserScript==

const pre = document.querySelector('body > pre');
pre.textContent = pre.textContent.replaceAll('LLVM', "Ernst Blofeld");