add permanently HEAD links on Gist for UserScript

README.md

gist raw perm HEAD

Install

• https://gist.github.com/denilsonsa/f2e5b9ee53e633e20165/raw/gist-raw-perm-HEAD.user.js

About

Visit Gist and see 'raw' link, It's including SHA-1 long hash name like this.

https://gist.github.com/raw/2370972/47150711fedb7375d19d761ab122485b8105678d/gist-raw-perm-HEAD.user.js

This user.js provide 'HEAD' links. It's takes shrinked permanent raw link and shrinked named raw link when you browse Gist files.

HEAD

True Permalink: This is absolutery permanent link but it's always filetype: txt.

https://gist.github.com/raw/2370972/

HEAD(named)

Almost Permalink: This is almost permanent link. It's strict filetype by extension. This link broken when filename changed.

https://gist.github.com/raw/2370972/gist-raw-perm-HEAD.user.js

This link most useful for install user.js from Gist.

See also

• https://gist.github.com/noromanba/2370972 - The original version of this user-script (and all the known forks)

gist-raw-perm-HEAD.user.js

// ==UserScript==
// @name        gist raw perm HEAD
// @namespace   http://www.hatena.ne.jp/noromanba/
// @description Add permanently HEAD link on Gist for UserScript
// @include     https://gist.github.com/*
// @exclude     https://gist.github.com/*/*/revisions
// @grant       none
// @version     2023.05.24.0
// @homepage    https://gist.github.com/2370972
// @downloadURL https://gist.github.com/denilsonsa/f2e5b9ee53e633e20165/raw/gist-raw-perm-HEAD.user.js
// @license     MIT License http://nrm.mit-license.org/2012
// @author      noromanba   http://noromanba.flavors.me
// @icon        https://upload.wikimedia.org/wikipedia/commons/thumb/9/9b/Color_icon_orange_v2.svg/32px-Color_icon_orange_v2.svg.png
// @icon64      https://upload.wikimedia.org/wikipedia/commons/thumb/9/9b/Color_icon_orange_v2.svg/64px-Color_icon_orange_v2.svg.png
// ==/UserScript==

// Icon (PD by Mizunoryu, Badseed, Jacobolus)
// https://commons.wikimedia.org/wiki/File:Color_icon_orange_v2.svg

(function () {
    var appendButton = function code() {
        if (!/^https:\/\/gist\.github\.com\/[-\w]+\/\w+/.test(location.href)) {
            return;
        }

        var links = document.body.querySelectorAll('.file-header .file-actions a.Button');
        if (!links) {
            return;
        }

        Array.prototype.forEach.call(links, function (hashlink) {
            // <a class="Button--secondary Button--small Button" href="/noromanba/2370972/raw/87006e128def317d4e10e8fce2ebe62d0530c214/README.md">
            //   <span class="Button-content">
            //     <span class="Button-label">
            //       Raw
            //     </span>
            //   </span>
            // </a>

            // RegExp groups:
            // 1 = prefix
            // 2 = hash
            // 3 = filename
            var match = /(.*\/raw)\/([0-9a-fA-F]+)\/([^/]+)$/.exec(hashlink.href);
            if (!match) {
                return;
            }
            var perm = document.createElement('a');
            perm.textContent = 'HEAD';
            perm.classList.add('Button', 'Button--small', 'Button--secondary');
            perm.href = match[1] + '/' + match[3];
            perm.title = match[3];

            // Inserting the HEAD button right after the Raw button.
            hashlink.parentNode.insertBefore(perm, hashlink.nextSibling);
        });
    };
    appendButton();

    // FIXME 100% cpu usage
    /*
    // c.f. MutationObserver
    // https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver
    // http://caniuse.com/#feat=mutationobserver
    new MutationObserver(function (records) {
        //records.forEach(function (record) {
            appendButton();
        //});
    }).observe(document.body, { childList: true, subtree: true });
    */
})();