// ==UserScript==
// @name GitHub TOC
// @version 1.0.0
// @description A userscript that adds a table of contents to readme & wiki pages
// @license https://creativecommons.org/licenses/by-sa/4.0/
// @namespace http://github.com/Mottie
// @include https://github.com/*
// @run-at document-idle
// @grant GM_registerMenuCommand
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_addStyle
// @author Rob Garrison
// ==/UserScript==
/* global GM_registerMenuCommand, GM_getValue, GM_setValue, GM_addStyle */
/*jshint unused:true */
(function() {
"use strict";
GM_addStyle([
".github-toc { position:fixed; z-index:75; min-width:200px; top:55px; right:10px; }",
".github-toc h3 { cursor:move; }",
// icon toggles TOC container & subgroups
".github-toc h3 svg, .github-toc li.collapsible .github-toc-icon { cursor:pointer; }",
// move collapsed TOC to top right corner
".github-toc.collapsed {",
"width:30px; height:30px; min-width:auto; overflow:hidden; top:10px !important; left:auto !important;",
"right:10px !important; border:1px solid #d8d8d8; border-radius:3px;",
"}",
".github-toc.collapsed > h3 { cursor:pointer; padding-top:5px; border:none; }",
// move header text out-of-view when collapsed
".github-toc.collapsed > h3 svg { margin-bottom: 10px; }",
".github-toc-hidden, .github-toc.collapsed .boxed-group-inner,",
".github-toc li:not(.collapsible) .github-toc-icon { display:none; }",
".github-toc .boxed-group-inner { max-width:250px; max-height:400px; overflow-y:auto; overflow-x:hidden; }",
".github-toc ul { list-style:none; }",
".github-toc li { max-width:230px; white-space:nowrap; overflow-x:hidden; text-overflow:ellipsis; }",
".github-toc .github-toc-h1 { padding-left:15px; }",
".github-toc .github-toc-h2 { padding-left:30px; }",
".github-toc .github-toc-h3 { padding-left:45px; }",
".github-toc .github-toc-h4 { padding-left:60px; }",
".github-toc .github-toc-h5 { padding-left:75px; }",
".github-toc .github-toc-h6 { padding-left:90px; }",
// anchor collapsible icon
".github-toc li.collapsible .github-toc-icon {",
"width:16px; height:16px; display:inline-block; margin-left:-16px;",
"background: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIGNsYXNzPSdvY3RpY29uJyBoZWlnaHQ9JzE0JyB2aWV3Qm94PScwIDAgMTIgMTYnPjxwYXRoIGQ9J00wIDVsNiA2IDYtNkgweic+PC9wYXRoPjwvc3ZnPg==) left center no-repeat;",
"}",
// on rotate, height becomes width, so this is keeping things lined up
".github-toc li.collapsible.collapsed .github-toc-icon { -webkit-transform:rotate(-90deg); transform:rotate(-90deg); height:10px; width:12px; margin-right:2px; }",
".github-toc-no-selection { -webkit-user-select:none !important; -moz-user-select:none !important; user-select:none !important; }"
].join(""));
// modifiable title
var title = GM_getValue("github-toc-title", "Table of Contents"),
container = document.createElement("div"),
busy = false,
// keyboard shortcuts
keyboard = {
toggle : "g+t",
restore : "g+r",
timer : null,
lastKey : null,
delay : 1000 // ms between keyboard shortcuts
},
// drag variables
drag = {
el : null,
pos : [ 0, 0 ],
elm : [ 0, 0 ],
time : 0,
unsel: null
},
// drag code adapted from http://jsfiddle.net/tovic/Xcb8d/light/
dragInit = function() {
if (!container.classList.contains("collapsed")) {
drag.el = container;
drag.elm[0] = drag.pos[0] - drag.el.offsetLeft;
drag.elm[1] = drag.pos[1] - drag.el.offsetTop;
selectionToggle(true);
} else {
drag.el = null;
}
drag.time = new Date().getTime() + 500;
},
dragMove = function(event) {
drag.pos[0] = document.all ? window.event.clientX : event.pageX;
drag.pos[1] = document.all ? window.event.clientY : event.pageY;
if (drag.el !== null) {
drag.el.style.left = (drag.pos[0] - drag.elm[0]) + "px";
drag.el.style.top = (drag.pos[1] - drag.elm[1]) + "px";
drag.el.style.right = "auto";
}
},
dragStop = function() {
if (drag.el !== null) {
dragSave();
selectionToggle();
}
drag.el = null;
},
dragSave = function(clear) {
var val = clear ? null : [container.style.left, container.style.top];
GM_setValue("github-toc-location", val);
},
// stop text selection while dragging
selectionToggle = function(disable) {
var sel,
body = document.querySelector("body");
if (disable) {
// save current "unselectable" value
drag.unsel = body.getAttribute("unselectable");
body.setAttribute("unselectable", "on");
body.classList.add("github-toc-no-selection");
body.addEventListener("onselectstart", selectionStop);
} else {
if (drag.unsel) {
body.setAttribute("unselectable", drag.unsel);
}
body.classList.remove("github-toc-no-selection");
body.removeEventListener("onselectstart", selectionStop);
}
// remove text selection - http://stackoverflow.com/a/3171348/145346
sel = window.getSelection ? window.getSelection() : document.selection;
if ( sel ) {
if ( sel.removeAllRanges ) {
sel.removeAllRanges();
} else if ( sel.empty ) {
sel.empty();
}
}
},
selectionStop = function() {
return false;
},
tocShow = function() {
container.classList.remove("collapsed");
GM_setValue("github-toc-hidden", false);
},
tocHide = function() {
container.classList.add("collapsed");
GM_setValue("github-toc-hidden", true);
},
tocToggle = function() {
// don't toggle content on long clicks
if (drag.time > new Date().getTime()) {
if (container.classList.contains("collapsed")) {
tocShow();
} else {
tocHide();
}
}
},
// hide TOC entirely, if no rendered markdown detected
tocView = function(mode) {
document.querySelector(".github-toc").style.display = mode || "none";
},
tocAdd = function() {
if (document.querySelectorAll("#wiki-content, #readme")) {
var indx, header, anchor, txt,
content = "<ul>",
anchors = document.querySelectorAll(".markdown-body .anchor"),
len = anchors.length;
if (len) {
busy = true;
for (indx = 0; indx < len; indx++) {
anchor = anchors[indx];
if (anchor.parentNode) {
header = anchor.parentNode;
// replace single & double quotes with right angled quotes
txt = header.textContent.trim().replace(/'/g, "’").replace(/"/g, "”");
content += [
"<li class='github-toc-" + header.nodeName.toLowerCase() + "'>",
// using a ZenHub class here to invert the icon for the dark theme
"<span class='github-toc-icon octicon zh-octicon-grey'></span>",
"<a href='" + anchor.hash + "' title='" + txt + "'>" + txt + "</a>",
"</li>"
].join("");
}
}
container.querySelector(".boxed-group-inner").innerHTML = content + "</ul>";
tocView("block");
listCollapsible();
busy = false;
} else {
tocView();
}
} else {
tocView();
}
},
addClass = function(els, name) {
var indx,
len = els.length;
for (indx = 0; indx < len; indx++) {
els[indx].classList.add(name);
}
},
removeClass = function(els, name) {
var indx,
len = els.length;
for (indx = 0; indx < len; indx++) {
els[indx].classList.remove(name);
}
},
listCollapsible = function() {
var indx, el, next, count, num, group,
els = container.querySelectorAll("li"),
len = els.length;
for (indx = 0; indx < len; indx++) {
count = 0;
group = [];
el = els[indx];
next = el && el.nextSibling;
if (next) {
num = el.className.match(/\d/)[0];
while (next && !next.classList.contains("github-toc-h" + num)) {
count += next.className.match(/\d/)[0] > num ? 1 : 0;
group[group.length] = next;
next = next.nextSibling;
}
if (count > 0) {
el.className += " collapsible collapsible-" + indx;
addClass(group, "github-toc-childof-" + indx);
}
}
}
group = [];
container.addEventListener("click", function(event) {
if (event.target.classList.contains("github-toc-icon")) {
// click on icon, then target LI parent
var item = event.target.parentNode,
num = item.className.match(/collapsible-(\d+)/),
els = num ? container.querySelectorAll(".github-toc-childof-" + num[1]) : null;
if (els) {
if (item.classList.contains("collapsed")) {
item.classList.remove("collapsed");
removeClass(els, "github-toc-hidden");
} else {
item.classList.add("collapsed");
addClass(els, "github-toc-hidden");
}
}
}
});
},
// keyboard shortcuts
// not sure what GitHub uses, so rolling our own
keyboardCheck = function(event) {
clearTimeout(keyboard.timer);
// use "g+t" to toggle the panel; "g+r" to reset the position
// keypress may be needed for non-alphanumeric keys
var tocToggle = keyboard.toggle.split("+"),
tocReset = keyboard.restore.split("+"),
key = String.fromCharCode(event.which).toLowerCase(),
panelHidden = container.classList.contains("collapsed");
// press escape to close the panel
if (event.which === 27 && !panelHidden) {
tocHide();
return;
}
// prevent opening panel while typing in comments
if (/(input|textarea)/i.test(document.activeElement.nodeName)) {
return;
}
// toggle TOC
if (keyboard.lastKey === tocToggle[0] && key === tocToggle[1]) {
if (panelHidden) {
tocShow();
} else {
tocHide();
}
}
// reset TOC window position
if (keyboard.lastKey === tocReset[0] && key === tocReset[1]) {
container.setAttribute("style", "");
dragSave(true);
}
keyboard.lastKey = key;
keyboard.timer = setTimeout(function() {
keyboard.lastKey = null;
}, keyboard.delay);
},
// DOM targets - to detect GitHub dynamic ajax page loading
targets = document.querySelectorAll([
"#js-repo-pjax-container",
// targeted by ZenHub
"#js-repo-pjax-container > .container",
"#js-pjax-container",
".js-preview-body"
].join(",")),
// insert TOC after header
tmp = GM_getValue("github-toc-location", null);
// restore last position
if (tmp) {
container.style.left = tmp[0];
container.style.top = tmp[1];
container.style.right = "auto";
}
// TOC saved state
tmp = GM_getValue("github-toc-hidden", false);
container.className = "github-toc boxed-group wiki-pages-box readability-sidebar" + (tmp ? " collapsed" : "");
container.setAttribute("role", "navigation");
container.setAttribute("unselectable", "on");
container.innerHTML = [
"<h3 class='js-wiki-toggle-collapse wiki-auxiliary-content' data-hotkey='g t'>",
"<svg class='octicon github-toc-icon' height='14' width='14' xmlns='http://www.w3.org/2000/svg' viewbox='0 0 16 12'><path d='M2 13c0 .6 0 1-.6 1H.6c-.6 0-.6-.4-.6-1s0-1 .6-1h.8c.6 0 .6.4.6 1zm2.6-9h6.8c.6 0 .6-.4.6-1s0-1-.6-1H4.6C4 2 4 2.4 4 3s0 1 .6 1zM1.4 7H.6C0 7 0 7.4 0 8s0 1 .6 1h.8C2 9 2 8.6 2 8s0-1-.6-1zm0-5H.6C0 2 0 2.4 0 3s0 1 .6 1h.8C2 4 2 3.6 2 3s0-1-.6-1zm10 5H4.6C4 7 4 7.4 4 8s0 1 .6 1h6.8c.6 0 .6-.4.6-1s0-1-.6-1zm0 5H4.6c-.6 0-.6.4-.6 1s0 1 .6 1h6.8c.6 0 .6-.4.6-1s0-1-.6-1z'/></svg> ",
"<span>" + title + "</span>",
"</h3>",
"<div class='boxed-group-inner wiki-auxiliary-content wiki-auxiliary-content-no-bg'></div>"
].join("");
// add container
tmp = document.querySelector(".header");
tmp.parentNode.insertBefore(container, tmp);
// make draggable
container.querySelector("h3").addEventListener("mousedown", dragInit);
document.addEventListener("mousemove", dragMove);
document.addEventListener("mouseup", dragStop);
// toggle TOC
container.querySelector(".github-toc-icon").addEventListener("mouseup", tocToggle);
// prevent container content selection
container.addEventListener("onselectstart", function() { return false; });
// keyboard shortcuts
// document.addEventListener("keypress", keyboardCheck);
document.addEventListener("keydown", keyboardCheck);
// update TOC when content changes
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) {
tocAdd();
}
});
}).observe(target, {
childList: true,
subtree: true
});
});
// Add GM options
GM_registerMenuCommand("Set Table of Contents Title", function() {
title = prompt("Table of Content Title:", title);
GM_setValue("toc-title", title);
container.querySelector("h3 span").textContent = title;
});
tocAdd();
})();
