☰

GitHub Collapse Markdown

A userscript that collapses markdown headers

目前為 2021-01-31 提交的版本，檢視 最新版本。

  1. // ==UserScript==
  2. // @name        GitHub Collapse Markdown
  3. // @version     1.2.1
  4. // @description A userscript that collapses markdown headers
  5. // @license     MIT
  6. // @author      Rob Garrison
  7. // @namespace   https://github.com/Mottie
  8. // @include     https://github.com/*
  9. // @include     https://gist.github.com/*
  10. // @include     https://help.github.com/*
  11. // @run-at      document-idle
  12. // @grant       GM_addStyle
  13. // @grant       GM_getValue
  14. // @grant       GM_setValue
  15. // @grant       GM_registerMenuCommand
  16. // @require     https://greasyfork.org/scripts/28721-mutations/code/mutations.js?version=882023
  17. // @icon        https://github.githubassets.com/pinned-octocat.svg
  18. // ==/UserScript==
  19. (() => {
  20. 	"use strict";
  21.  
  22. 	const defaultColors = [
  23. 			// palette generated by http://tools.medialab.sciences-po.fr/iwanthue/
  24. 			// (colorblind friendly, soft)
  25. 			"#6778d0", "#ac9c3d", "#b94a73", "#56ae6c", "#9750a1", "#ba543d"
  26. 		],
  27.  
  28. 		blocks = [
  29. 			".markdown-body",
  30. 			".markdown-format",
  31. 			"" // leave empty string at the end
  32. 		],
  33.  
  34. 		headers = "H1 H2 H3 H4 H5 H6".split(" "),
  35. 		collapsed = "ghcm-collapsed",
  36. 		arrowColors = document.createElement("style");
  37.  
  38. 	let startCollapsed = GM_getValue("ghcm-collapsed", false),
  39. 		colors = GM_getValue("ghcm-colors", defaultColors);
  40.  
  41. 	// .markdown-body h1:after, .markdown-format h1:after, ... {}
  42. 	GM_addStyle(`
  43. 		${blocks.join(" h1,")} ${blocks.join(" h2,")}
  44. 		${blocks.join(" h3,")} ${blocks.join(" h4,")}
  45. 		${blocks.join(" h5,")} ${blocks.join(" h6,").slice(0, -1)} {
  46. 			position:relative;
  47. 			padding-right:.8em;
  48. 			cursor:pointer;
  49. 		}
  50. 		${blocks.join(" h1:after,")} ${blocks.join(" h2:after,")}
  51. 		${blocks.join(" h3:after,")} ${blocks.join(" h4:after,")}
  52. 		${blocks.join(" h5:after,")} ${blocks.join(" h6:after,").slice(0, -1)} {
  53. 			display:inline-block;
  54. 			position:absolute;
  55. 			right:0;
  56. 			top:calc(50% - .5em);
  57. 			font-size:.8em;
  58. 			content:"\u25bc";
  59. 		}
  60. 		${blocks.join(" ." + collapsed + ":after,").slice(0, -1)} {
  61. 			transform: rotate(90deg);
  62. 		}
  63. 		/* clicking on header link won't pass svg as the event.target */
  64. 		.octicon-link, .octicon-link > * {
  65. 			pointer-events:none;
  66. 		}
  67. 		.ghcm-hidden, .ghcm-no-content:after {
  68. 			display:none !important;
  69. 		}
  70. 	`);
  71.  
  72. 	function addColors() {
  73. 		let sel,
  74. 			styles = "";
  75. 		headers.forEach((header, indx) => {
  76. 			sel = `${blocks.join(" " + header + ":after,").slice(0, -1)}`;
  77. 			styles += `${sel} { color:${colors[indx]} }`;
  78. 		});
  79. 		arrowColors.textContent = styles;
  80. 	}
  81.  
  82. 	function toggle(el, shifted) {
  83. 		if (el && !el.classList.contains("ghcm-no-content")) {
  84. 			el.classList.toggle(collapsed);
  85. 			let els;
  86. 			const name = el.nodeName || "",
  87. 				// convert H# to #
  88. 				level = parseInt(name.replace(/[^\d]/, ""), 10),
  89. 				isCollapsed = el.classList.contains(collapsed);
  90. 			if (shifted) {
  91. 				// collapse all same level anchors
  92. 				els = $$(`${blocks.join(" " + name + ",").slice(0, -1)}`);
  93. 				for (el of els) {
  94. 					nextHeader(el, level, isCollapsed);
  95. 				}
  96. 			} else {
  97. 				nextHeader(el, level, isCollapsed);
  98. 			}
  99. 			removeSelection();
  100. 		}
  101. 	}
  102.  
  103. 	function nextHeader(el, level, isCollapsed) {
  104. 		el.classList.toggle(collapsed, isCollapsed);
  105. 		const selector = headers.slice(0, level).join(","),
  106. 			name = [collapsed, "ghcm-hidden"],
  107. 			els = [];
  108. 		el = el.nextElementSibling;
  109. 		while (el && !el.matches(selector)) {
  110. 			els[els.length] = el;
  111. 			el = el.nextElementSibling;
  112. 		}
  113. 		if (els.length) {
  114. 			if (isCollapsed) {
  115. 				els.forEach(el => {
  116. 					el.classList.add("ghcm-hidden");
  117. 				});
  118. 			} else {
  119. 				els.forEach(el => {
  120. 					el.classList.remove(...name);
  121. 				});
  122. 			}
  123. 		}
  124. 	}
  125.  
  126. 	// show siblings of hash target
  127. 	function siblings(target) {
  128. 		let el = target.nextElementSibling,
  129. 			els = [target];
  130. 		const level = parseInt((target.nodeName || "").replace(/[^\d]/, ""), 10),
  131. 			selector = headers.slice(0, level - 1).join(",");
  132. 		while (el && !el.matches(selector)) {
  133. 			els[els.length] = el;
  134. 			el = el.nextElementSibling;
  135. 		}
  136. 		el = target.previousElementSibling;
  137. 		while (el && !el.matches(selector)) {
  138. 			els[els.length] = el;
  139. 			el = el.previousElementSibling;
  140. 		}
  141. 		if (els.length) {
  142. 			els = els.filter(el => {
  143. 				return el.nodeName === target.nodeName;
  144. 			});
  145. 			for (el of els) {
  146. 				el.classList.remove("glcm-hidden");
  147. 			}
  148. 		}
  149. 		nextHeader(target, level, false);
  150. 	}
  151.  
  152. 	function removeSelection() {
  153. 		// remove text selection - https://stackoverflow.com/a/3171348/145346
  154. 		const sel = window.getSelection ? window.getSelection() : document.selection;
  155. 		if (sel) {
  156. 			if (sel.removeAllRanges) {
  157. 				sel.removeAllRanges();
  158. 			} else if (sel.empty) {
  159. 				sel.empty();
  160. 			}
  161. 		}
  162. 	}
  163.  
  164. 	function addBinding() {
  165. 		document.addEventListener("click", event => {
  166. 			let target = event.target;
  167. 			const name = (target && (target.nodeName || "")).toLowerCase();
  168. 			if (name === "path") {
  169. 				target = target.closest("svg");
  170. 			}
  171. 			if (!target || target.classList.contains("anchor") ||
  172. 				name === "a" || name === "img" ||
  173. 				// add support for "pointer-events:none" applied to "anchor" in
  174. 				// https://github.com/StylishThemes/GitHub-FixedHeader
  175. 				target.classList.contains("octicon-link")) {
  176. 				return;
  177. 			}
  178. 			// check if element is inside a header
  179. 			target = event.target.closest(headers.join(","));
  180. 			if (target && headers.indexOf(target.nodeName || "") > -1) {
  181. 				// make sure the header is inside of markdown
  182. 				if (target.closest(blocks.slice(0, -1).join(","))) {
  183. 					toggle(target, event.shiftKey);
  184. 				}
  185. 			}
  186. 		});
  187. 		document.addEventListener("ghmo:container", () => {
  188. 			// init after a short delay to allow rendering of file list
  189. 			setTimeout(() => {
  190. 				ignoreEmptyHeaders();
  191. 			}, 200);
  192. 		});
  193. 	}
  194.  
  195. 	function checkHash() {
  196. 		let el, els, md;
  197. 		const mds = $$(blocks.slice(0, -1).join(",")),
  198. 			id = (window.location.hash || "").replace(/#/, "");
  199. 		for (md of mds) {
  200. 			els = $$(headers.join(","), md);
  201. 			if (els.length > 1) {
  202. 				for (el of els) {
  203. 					if (el && !el.classList.contains(collapsed)) {
  204. 						toggle(el, true);
  205. 					}
  206. 				}
  207. 			}
  208. 		}
  209. 		if (id) {
  210. 			openHash(id);
  211. 		}
  212. 	}
  213.  
  214. 	// open header matching hash
  215. 	function openHash(id) {
  216. 		const els = $(`#user-content-${id}`);
  217. 		if (els && els.classList.contains("anchor")) {
  218. 			let el = els.parentNode;
  219. 			if (el.matches(headers.join(","))) {
  220. 				siblings(el);
  221. 				document.documentElement.scrollTop = el.offsetTop;
  222. 				// set scrollTop a second time, in case of browser lag
  223. 				setTimeout(() => {
  224. 					document.documentElement.scrollTop = el.offsetTop;
  225. 				}, 500);
  226. 			}
  227. 		}
  228. 	}
  229.  
  230. 	function checkColors() {
  231. 		if (!colors || colors.length !== 6) {
  232. 			colors = [].concat(defaultColors);
  233. 		}
  234. 	}
  235.  
  236. 	function ignoreEmptyHeaders() {
  237. 		$$("a.anchor").forEach(el => {
  238. 			const parent = el.parentNode;
  239. 			if (parent && parent.matches(headers.join(",")) && !parent.nextElementSibling) {
  240. 				parent.classList.add("ghcm-no-content");
  241. 			}
  242. 		});
  243. 	}
  244.  
  245. 	function init() {
  246. 		document.querySelector("head").appendChild(arrowColors);
  247. 		checkColors();
  248. 		addColors();
  249. 		addBinding();
  250. 		ignoreEmptyHeaders();
  251. 		if (startCollapsed) {
  252. 			checkHash();
  253. 		}
  254. 	}
  255.  
  256. 	function $(selector, el) {
  257. 		return (el || document).querySelector(selector);
  258. 	}
  259.  
  260. 	function $$(selectors, el) {
  261. 		return [...(el || document).querySelectorAll(selectors)];
  262. 	}
  263.  
  264. 	// Add GM options
  265. 	GM_registerMenuCommand("Set collapse markdown state", () => {
  266. 		const val = prompt(
  267. 			"Set initial state to (c)ollapsed or (e)xpanded (first letter necessary):",
  268. 			startCollapsed ? "collapsed" : "expanded"
  269. 		);
  270. 		if (val !== null) {
  271. 			startCollapsed = /^c/i.test(val);
  272. 			GM_setValue("ghcm-collapsed", startCollapsed);
  273. 			console.log(
  274. 				`GitHub Collapse Markdown: Headers will ${startCollapsed ? "be" : "not be"} initially collapsed`
  275. 			);
  276. 		}
  277. 	});
  278.  
  279. 	GM_registerMenuCommand("Set collapse markdown colors", () => {
  280. 		let val = prompt("Set header arrow colors:", JSON.stringify(colors));
  281. 		if (val !== null) {
  282. 			// allow pasting in a JSON format
  283. 			try {
  284. 				val = JSON.parse(val);
  285. 				if (val && val.length === 6) {
  286. 					colors = val;
  287. 					GM_setValue("ghcm-colors", colors);
  288. 					console.log("GitHub Collapse Markdown: colors set to", colors);
  289. 					addColors();
  290. 					return;
  291. 				}
  292. 				console.error(
  293. 					"GitHub Collapse Markdown: invalid color definition (6 colors)",
  294. 					val
  295. 				);
  296. 				// reset colors to default (in case colors variable is corrupted)
  297. 				checkColors();
  298. 			} catch (err) {
  299. 				console.error("GitHub Collapse Markdown: invalid JSON");
  300. 			}
  301. 		}
  302. 	});
  303.  
  304. 	init();
  305.  
  306. })();