A userscript that adds a button to insert RTL text blocks in comments
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// ==UserScript==
// @name GitHub RTL Comment Blocks
// @version 1.2.4
// @description A userscript that adds a button to insert RTL text blocks in comments
// @license https://creativecommons.org/licenses/by-sa/4.0/
// @namespace https://github.com/Mottie
// @include https://github.com/*
// @include https://gist.github.com/*
// @require https://greasyfork.org/scripts/28239-rangy-inputs-mod-js/code/rangy-inputs-modjs.js?version=181769
// @run-at document-idle
// @grant GM_addStyle
// @connect github.com
// @author Rob Garrison
// ==/UserScript==
(() => {
"use strict";
const icon = `
<svg class="octicon" xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 14 14">
<path d="M14 3v8l-4-4m-7 7V6C1 6 0 5 0 3s1-3 3-3h7v2H9v12H7V2H5v12H3z"/>
</svg>`,
// maybe using ⁧ RTL text ⁦ (isolates) is a better combo?
openRTL = "‏", // https://en.wikipedia.org/wiki/Right-to-left_mark
closeRTL = "‎", // https://en.wikipedia.org/wiki/Left-to-right_mark
regexOpen = /\u200f/ig,
regexClose = /\u200e/ig,
regexSplit = /(\u200f|\u200e)/ig;
GM_addStyle(`
.ghu-rtl-css { direction:rtl; text-align:right; }
/* delegated binding; ignore clicks on svg & path */
.ghu-rtl > * { pointer-events:none; }
/* override RTL on code blocks */
.js-preview-body pre, .markdown-body pre,
.js-preview-body code, .markdown-body code {
direction:ltr;
text-align:left;
unicode-bidi:normal;
}
`);
// Add RTL button
function addRtlButton() {
let el, button,
toolbars = $$(".toolbar-commenting"),
indx = toolbars.length;
if (indx) {
button = document.createElement("button");
button.type = "button";
button.className = "ghu-rtl toolbar-item tooltipped tooltipped-n";
button.setAttribute("aria-label", "RTL");
button.setAttribute("tabindex", "-1");
button.innerHTML = icon;
while (indx--) {
el = toolbars[indx];
if (!$(".ghu-rtl", el)) {
el.insertBefore(button.cloneNode(true), el.childNodes[0]);
}
}
}
checkRTL();
}
function checkContent(el) {
// check the contents, and wrap in either a span or div
let indx, // useDiv,
html = el.innerHTML,
parts = html.split(regexSplit),
len = parts.length;
for (indx = 0; indx < len; indx++) {
if (regexOpen.test(parts[indx])) {
// check if the content contains HTML
// useDiv = regexTestHTML.test(parts[indx + 1]);
// parts[indx] = (useDiv ? "<div" : "<span") + " class='ghu-rtl-css'>";
parts[indx] = "<div class='ghu-rtl-css'>";
} else if (regexClose.test(parts[indx])) {
// parts[indx] = useDiv ? "</div>" : "</span>";
parts[indx] = "</div>";
}
}
el.innerHTML = parts.join("");
// remove empty paragraph wrappers (may have previously contained the mark)
return el.innerHTML.replace(/<p><\/p>/g, "");
}
function checkRTL() {
let clone,
indx = 0,
div = document.createElement("div"),
containers = $$(".js-preview-body, .markdown-body"),
len = containers.length,
// main loop
loop = () => {
let el, tmp,
max = 0;
while (max < 10 && indx < len) {
if (indx > len) {
return;
}
el = containers[indx];
tmp = el.innerHTML;
if (regexOpen.test(tmp) || regexClose.test(tmp)) {
clone = div.cloneNode();
clone.innerHTML = tmp;
// now we can replace all instances
el.innerHTML = checkContent(clone);
max++;
}
indx++;
}
if (indx < len) {
setTimeout(() => {
loop();
}, 200);
}
};
loop();
}
function addBindings() {
window.rangyInput.init();
$("body").addEventListener("click", event => {
let textarea,
target = event.target;
if (target && target.classList.contains("ghu-rtl")) {
textarea = closest(".previewable-comment-form", target);
textarea = $(".comment-form-textarea", textarea);
textarea.focus();
// add extra white space around the tags
window.rangyInput.surroundSelectedText(
textarea,
" " + openRTL + " ",
" " + closeRTL + " "
);
return false;
}
});
}
function $(selector, el) {
return (el || document).querySelector(selector);
}
function $$(selector, el) {
return Array.from((el || document).querySelectorAll(selector));
}
function closest(selector, el) {
while (el && el.nodeType === 1) {
if (el.matches(selector)) {
return el;
}
el = el.parentNode;
}
return null;
}
document.addEventListener("pjax:end", addRtlButton);
// "preview:render" only fires when using the hotkey :(
// "preview:setup" fires on hover & click
document.addEventListener("preview:setup", event => {
if (event.target && event.target.classList.contains("preview-selected")) {
// must include some rendering time...
// 200 ms seems to be enough for a 1100+ line markdown file
setTimeout(() => {
checkRTL();
}, 500);
}
});
addBindings();
addRtlButton();
})();