A userscript that adds monospace font toggle to comments
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// ==UserScript==
// @name GitHub Monospace Font Toggle
// @version 1.0.0
// @description A userscript that adds monospace font toggle to comments
// @license https://creativecommons.org/licenses/by-sa/4.0/
// @namespace https://github.com/StylishThemes
// @include https://github.com/*
// @grant GM_addStyle
// @run-at document-end
// @author StylishThemes
// ==/UserScript==
/* global GM_addStyle */
(function() {
"use strict";
/*
This code is also part of the GitHub-Dark Script (https://github.com/StylishThemes/GitHub-Dark-Script)
Extracted out into a separate userscript in case users only want to add this functionality
*/
var busy = false,
icon = [
"<svg class='octicon' xmlns='http://www.w3.org/2000/svg' width='18' height='18' viewbox='0 0 32 32'>",
"<path d='M5.91 7.31v8.41c0 .66.05 1.09.14 1.31.09.21.23.37.41.48.18.11.52.16 1.02.16v.41H2.41v-.41c.5 0 .86-.05 1.03-.14.16-.11.3-.27.41-.5.11-.23.16-.66.16-1.3V11.7c0-1.14-.04-1.87-.11-2.2-.04-.26-.13-.42-.24-.53-.11-.1-.27-.14-.46-.14-.21 0-.48.05-.77.18l-.18-.41 3.14-1.28h.52v-.01zm-.95-5.46c.32 0 .59.11.82.34.23.23.34.5.34.82 0 .32-.11.59-.34.82-.23.22-.51.34-.82.34-.32 0-.59-.11-.82-.34s-.36-.5-.36-.82c0-.32.11-.59.34-.82.24-.23.51-.34.84-.34zm19.636 19.006h-3.39v-1.64h5.39v9.8h3.43v1.66h-9.18v-1.66h3.77v-8.16h-.02zm.7-6.44c.21 0 .43.04.63.13.18.09.36.2.5.34s.25.3.34.5c.07.18.13.39.13.61 0 .22-.04.41-.13.61s-.19.36-.34.5-.3.25-.5.32c-.2.09-.39.13-.62.13-.21 0-.43-.04-.61-.12-.19-.07-.35-.19-.5-.34-.14-.14-.25-.3-.34-.5-.07-.2-.13-.39-.13-.61s.04-.43.13-.61c.07-.18.2-.36.34-.5s.31-.25.5-.34c.17-.09.39-.12.6-.12zM2 30L27.82 2H30L4.14 30H2z'/>",
"</svg>"
].join(""),
// Add monospace font toggle
addMonospaceToggle = function() {
busy = true;
var indx, el, button,
toolbars = document.querySelectorAll(".toolbar-commenting"),
len = toolbars.length;
for (indx = 0; indx < len; indx++) {
el = toolbars[indx];
if (!el.querySelector(".ghd-monospace")) {
button = document.querySelector("button");
button.type = "button";
button.className = "ghd-monospace toolbar-item tooltipped tooltipped-n";
button.setAttribute("aria-label", "Toggle monospaced font");
button.setAttribute("tabindex", "-1");
button.innerHTML = icon;
el.insertBefore(button, el.childNodes[0]);
}
}
busy = false;
},
matches = function(el, selector) {
// https://developer.mozilla.org/en-US/docs/Web/API/Element/matches
var matches = document.querySelectorAll(selector),
i = matches.length;
while (--i >= 0 && matches.item(i) !== el) {}
return i > -1;
},
closest = function(el, selector) {
while (el && !matches(el, selector)) {
el = el.parentNode;
}
return matches(el, selector) ? el : null;
},
addBindings = function() {
document.querySelector("body").addEventListener("click", function(event) {
var textarea, active,
target = event.target;
if (target && target.classList.contains("ghd-monospace")) {
textarea = closest(target, ".previewable-comment-form");
textarea = textarea.querySelector(".comment-form-textarea");
textarea.classList.toggle("ghd-monospace-font");
textarea.focus();
active = textarea.classList.contains("ghd-monospace-font");
target.classList[active ? "add" : "remove"]("ghd-icon-active");
return false;
}
});
},
targets = document.querySelectorAll([
"#js-repo-pjax-container",
"#js-pjax-container",
".js-preview-body"
].join(","));
// don't initialize if GitHub Dark Script is active
if (!document.querySelector("#ghd-menu")) {
GM_addStyle([
// monospace font toggle
".ghd-monospace-font { font-family: Menlo, Inconsolata, 'Droid Mono', monospace !important; font-size: 1em !important; }",
".ghd-monospace > svg { pointer-events: none; }"
].join(""));
Array.prototype.forEach.call(targets, function(target) {
new MutationObserver(function(mutations) {
mutations.forEach(function(mutation) {
// preform checks before adding code wrap to minimize function calls
if (!busy && mutation.target === target) {
addMonospaceToggle();
}
});
}).observe(target, {
childList: true,
subtree: true
});
});
addBindings();
addMonospaceToggle();
}
})();