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Mottie / Bitbucket Collapse Markdown

// ==UserScript==
// @name        Bitbucket Collapse Markdown
// @version     0.1.0
// @description A userscript that collapses markdown headers
// @license     https://creativecommons.org/licenses/by-sa/4.0/
// @author      Rob Garrison
// @namespace   https://github.com/Mottie
// @include     https://bitbucket.org/*
// @run-at      document-idle
// @grant       GM_addStyle
// @grant       GM_getValue
// @grant       GM_setValue
// @grant       GM_registerMenuCommand
// @icon        https://bitbucket.org/mottie/bitbucket-userscripts/raw/HEAD/images/bitbucket.svg
// @updateURL   https://bitbucket.org/mottie/bitbucket-userscripts/raw/HEAD/bitbucket-collapse-markdown.user.js
// @downloadURL https://bitbucket.org/mottie/bitbucket-userscripts/raw/HEAD/bitbucket-collapse-markdown.user.js
// ==/UserScript==
(() => {
	"use strict";

	const defaultColors = [
			// palette generated by http://tools.medialab.sciences-po.fr/iwanthue/
			// (colorblind friendly, soft)
			"#6778d0", "#ac9c3d", "#b94a73", "#56ae6c", "#9750a1", "#ba543d"
		],

		headers = "H1 H2 H3 H4 H5 H6".split(" "),
		collapsed = "bbcm-collapsed",
		arrowColors = document.createElement("style");

	let startCollapsed = GM_getValue("bbcm-collapsed", false),
		colors = GM_getValue("bbcm-colors", defaultColors);

	GM_addStyle(`
		.wiki-content h1, .wiki-content h2, .wiki-content h3,
		.wiki-content h4, .wiki-content h5, .wiki-content h6 {
			position:relative;
			padding-right:.8em;
			cursor:pointer;
		}
		.wiki-content h1:after, .wiki-content h2:after, .wiki-content h3:after,
		.wiki-content h4:after, .wiki-content h5:after, .wiki-content h6:after {
			display:inline-block;
			position:absolute;
			right:0;
			top:calc(50% - .5em);
			font-size:.8em;
			content:"\u25bc";
		}
		.wiki-content .${collapsed}:after {
			transform: rotate(90deg);
		}
		.bbcm-hidden {
			display:none !important;
		}
	`);

	function addColors() {
		arrowColors.textContent = `
			.wiki-content h1:after { color:${colors[0]} }
			.wiki-content h2:after { color:${colors[1]} }
			.wiki-content h3:after { color:${colors[2]} }
			.wiki-content h4:after { color:${colors[3]} }
			.wiki-content h5:after { color:${colors[4]} }
			.wiki-content h6:after { color:${colors[5]} }
		`;
	}

	function toggle(el, shifted) {
		if (el) {
			el.classList.toggle(collapsed);
			let els;
			const name = el.nodeName || "",
				level = parseInt(name.replace(/[^\d]/, ""), 10),
				isCollapsed = el.classList.contains(collapsed);
			if (shifted) {
				// collapse all same level anchors
				els = $$(`.wiki-content ${name}`);
				for (el of els) {
					nextHeader(el, level, isCollapsed);
				}
			} else {
				nextHeader(el, level, isCollapsed);
			}
			removeSelection();
		}
	}

	function nextHeader(el, level, isCollapsed) {
		el.classList.toggle(collapsed, isCollapsed);
		const selector = headers.slice(0, level).join(","),
			name = [collapsed, "bbcm-hidden"],
			els = [];
		el = el.nextElementSibling;
		while (el && !el.matches(selector)) {
			els[els.length] = el;
			el = el.nextElementSibling;
		}
		if (els.length) {
			if (isCollapsed) {
				els.forEach(el => {
					el.classList.add("bbcm-hidden");
				});
			} else {
				els.forEach(el => {
					el.classList.remove(...name);
				});
			}
		}
	}

	function removeSelection() {
		// remove text selection - https://stackoverflow.com/a/3171348/145346
		const sel = window.getSelection ?
			window.getSelection() :
			document.selection;
		if (sel) {
			if (sel.removeAllRanges) {
				sel.removeAllRanges();
			} else if (sel.empty) {
				sel.empty();
			}
		}
	}

	function addBinding() {
		document.addEventListener("click", event => {
			const target = event.target;
			if (target && headers.indexOf(target.nodeName || "") > -1) {
				// make sure the header is inside of markdown
				if (closest(".wiki-content", target)) {
					toggle(target, event.shiftKey);
				}
			}
		});
	}

	function checkColors() {
		if (!colors || colors.length !== 6) {
			colors = [].concat(defaultColors);
		}
	}

	function init() {
		document.querySelector("head").appendChild(arrowColors);
		checkColors();
		addColors();
		addBinding();
	}

	function $$(selectors, el) {
		return Array.from((el || document).querySelectorAll(selectors));
	}

	function closest(selector, el) {
		while (el && el.nodeType === 1) {
			if (el.matches(selector)) {
				return el;
			}
			el = el.parentNode;
		}
		return null;
	}

	// Add GM options
	GM_registerMenuCommand("Set Bitbucket collapse markdown state", () => {
		const val = prompt(
			"Set initial state to (c)ollapsed or (e)xpanded (first letter only):",
			startCollapsed ? "collapsed" : "expanded"
		);
		if (val !== null) {
			startCollapsed = /^c/i.test(val);
			GM_setValue("bbcm-collapsed", startCollapsed);
			console.log(
				`Bitbucket Collapse Markdown: Headers will ` +
				`${startCollapsed ? "be" : "not be"} initially collapsed`
			);
		}
	});

	GM_registerMenuCommand("Set Bitbucket collapse markdown colors", () => {
		let val = prompt("Set header arrow colors:", JSON.stringify(colors));
		if (val !== null) {
			// allow pasting in a JSON format
			try {
				val = JSON.parse(val);
				if (val && val.length === 6) {
					colors = val;
					GM_setValue("bbcm-colors", colors);
					console.log("Bitbucket Collapse Markdown: colors set to", colors);
					addColors();
					return;
				}
				console.error(
					"Bitbucket Collapse Markdown: invalid color definition (6 colors)",
					val
				);
				// reset colors to default (in case colors variable is corrupted)
				checkColors();
			} catch (err) {
				console.error("Bitbucket Collapse Markdown: invalid JSON");
			}
		}
	});

	init();

})();