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GitHub Code Folding

A userscript that adds code folding to GitHub files

当前为 2017-04-24 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name        GitHub Code Folding
  3. // @version     1.0.4
  4. // @description A userscript that adds code folding to GitHub files
  5. // @license     https://opensource.org/licenses/MIT
  6. // @author      Rob Garrison
  7. // @namespace   https://github.com/Mottie
  8. // @include     https://github.com/*
  9. // @run-at      document-idle
  10. // @grant       GM_addStyle
  11. // @require     https://greasyfork.org/scripts/28721-mutations/code/mutations.js?version=189706
  12. // @icon        https://github.com/fluidicon.png
  13. // ==/UserScript==
  14. /**
  15.  * This userscript has been heavily modified from the "github-code-folding"
  16.  * Chrome extension Copyright 2016 by Noam Lustiger; under an MIT license
  17.  * https://github.com/noam3127/github-code-folding
  18.  */
  19. (() => {
  20. 	"use strict";
  21.  
  22. 	GM_addStyle(`
  23. 		td.blob-code.blob-code-inner { padding-left:13px; }
  24. 		.collapser { position:absolute; left:2px; width:22px; opacity:.5;
  25. 			transition:.15s; cursor:pointer; }
  26. 		.collapser:after { content:"\u25bc"; }
  27. 		.collapser:hover { opacity:1; }
  28. 		.sideways { transform:rotate(-90deg); transform-origin:16% 49%; opacity:.8; }
  29. 		.hidden-line { display:none; }
  30. 		.ellipsis { padding:1px 2px; margin-left:2px; cursor:pointer;
  31. 			background:rgba(255,235,59,.4); }
  32. 		.ellipsis:hover { background:rgba(255,235,59,.7); }
  33. 	`);
  34.  
  35. 	const pairs = new Map(),
  36. 		ellipsis = document.createElement("span"),
  37. 		triangle = document.createElement("span");
  38.  
  39. 	triangle.className = "collapser";
  40. 	ellipsis.className = "pl-smi ellipsis";
  41. 	ellipsis.innerHTML = "…";
  42.  
  43. 	function countInitialWhiteSpace(arr) {
  44. 		const getWhiteSpaceIndex = i => {
  45. 			if (arr[i] !== " " && arr[i] !== "\t") {
  46. 				return i;
  47. 			}
  48. 			i++;
  49. 			return getWhiteSpaceIndex(i);
  50. 		};
  51. 		return getWhiteSpaceIndex(0);
  52. 	}
  53.  
  54. 	function getPreviousSpaces(map, lineNum) {
  55. 		let prev = map.get(lineNum - 1);
  56. 		return prev === -1 ?
  57. 			getPreviousSpaces(map, lineNum - 1) : {
  58. 				lineNum: lineNum - 1,
  59. 				count: prev
  60. 			};
  61. 	}
  62.  
  63. 	function getLineNumber(el) {
  64. 		let elm = closest("td", el),
  65. 			index = elm ? elm.id : "";
  66. 		if (index) {
  67. 			return parseInt(index.slice(2), 10);
  68. 		}
  69. 		return "";
  70. 	}
  71.  
  72. 	function toggleCode(action, index, depth) {
  73. 		let els, lineNums;
  74. 		const codeLines = $$(".file table.highlight .blob-code-inner");
  75. 		// depth is a string containing a specific depth number to toggle
  76. 		if (depth) {
  77. 			els = $$(`.collapser[data-depth="${depth}"]`);
  78. 			lineNums = els.map(el => {
  79. 				el.classList.toggle("sideways", action === "hide");
  80. 				return getLineNumber(el);
  81. 			});
  82. 		} else {
  83. 			lineNums = [index];
  84. 		}
  85.  
  86. 		if (action === "hide") {
  87. 			lineNums.forEach(start => {
  88. 				let end = pairs.get(start - 1);
  89. 				codeLines.slice(start, end).forEach(el => {
  90. 					let elm = closest("tr", el);
  91. 					if (elm) {
  92. 						elm.classList.add("hidden-line");
  93. 					}
  94. 				});
  95. 				if (!$(".ellipsis", codeLines[start - 1])) {
  96. 					codeLines[start - 1].appendChild(ellipsis.cloneNode(true));
  97. 				}
  98. 			});
  99. 		} else if (action === "show") {
  100. 			lineNums.forEach(start => {
  101. 				let end = pairs.get(start - 1);
  102. 				codeLines.slice(start, end).forEach(el => {
  103. 					let elm = closest("tr", el);
  104. 					if (elm) {
  105. 						elm.classList.remove("hidden-line");
  106. 						remove(".ellipsis", elm);
  107. 					}
  108. 					elm = $(".sideways", elm);
  109. 					if (elm) {
  110. 						elm.classList.remove("sideways");
  111. 					}
  112. 				});
  113. 				remove(".ellipsis", codeLines[start - 1]);
  114. 			});
  115. 		}
  116. 		// shift ends up selecting text on the page, so clear it
  117. 		if (lineNums.length > 1) {
  118. 			removeSelection();
  119. 		}
  120. 	}
  121.  
  122. 	function addBindings() {
  123. 		document.addEventListener("click", event => {
  124. 			let index, elm, isCollapsed;
  125. 			const el = event.target;
  126.  
  127. 			// click on collapser
  128. 			if (el && el.classList.contains("collapser")) {
  129. 				isCollapsed = el.classList.contains("sideways");
  130. 				index = getLineNumber(el);
  131. 				// Shift + click to toggle them all
  132. 				if (index && event.getModifierState("Shift")) {
  133. 					return toggleCode(
  134. 						isCollapsed ? "show" : "hide",
  135. 						index,
  136. 						el.getAttribute("data-depth")
  137. 					);
  138. 				}
  139. 				if (index) {
  140. 					if (isCollapsed) {
  141. 						el.classList.remove("sideways");
  142. 						toggleCode("show", index);
  143. 					} else {
  144. 						el.classList.add("sideways");
  145. 						toggleCode("hide", index);
  146. 					}
  147. 				}
  148. 				return;
  149. 			}
  150.  
  151. 			// click on ellipsis
  152. 			if (el && el.classList.contains("ellipsis")) {
  153. 				elm = $(".sideways", el.parentNode);
  154. 				if (elm) {
  155. 					elm.classList.remove("sideways");
  156. 				}
  157. 				index = getLineNumber(el);
  158. 				if (index) {
  159. 					toggleCode("show", index);
  160. 				}
  161. 			}
  162. 		});
  163. 	}
  164.  
  165. 	function addCodeFolding() {
  166. 		if ($(".file table.highlight")) {
  167. 			// In case this script has already been run and modified the DOM on a
  168. 			// previous page in github, make sure to reset it.
  169. 			remove("span.collapser");
  170. 			pairs.clear();
  171.  
  172. 			const codeLines = $$(".file table.highlight .blob-code-inner"),
  173. 				spaceMap = new Map(),
  174. 				stack = [];
  175.  
  176. 			codeLines.forEach((el, lineNum) => {
  177. 				let prevSpaces,
  178. 					line = el.textContent,
  179. 					count = line.trim().length ?
  180. 						countInitialWhiteSpace(line.split("")) :
  181. 						-1;
  182. 				spaceMap.set(lineNum, count);
  183.  
  184. 				function tryPair() {
  185. 					let el,
  186. 						top = stack[stack.length - 1];
  187. 					if (count !== -1 && count <= spaceMap.get(top)) {
  188. 						pairs.set(top, lineNum);
  189. 						// prepend triangle
  190. 						el = triangle.cloneNode();
  191. 						el.setAttribute("data-depth", count + 1);
  192. 						codeLines[top].insertBefore(el, codeLines[top].childNodes[0]);
  193. 						stack.pop();
  194. 						return tryPair();
  195. 					}
  196. 				}
  197. 				tryPair();
  198.  
  199. 				prevSpaces = getPreviousSpaces(spaceMap, lineNum);
  200. 				if (count > prevSpaces.count) {
  201. 					stack.push(prevSpaces.lineNum);
  202. 				}
  203. 			});
  204. 		}
  205. 	}
  206.  
  207. 	function $(selector, el) {
  208. 		return (el || document).querySelector(selector);
  209. 	}
  210.  
  211. 	function $$(selector, el) {
  212. 		return Array.from((el || document).querySelectorAll(selector));
  213. 	}
  214.  
  215. 	function closest(selector, el) {
  216. 		while (el && el.nodeType === 1) {
  217. 			if (el.matches(selector)) {
  218. 				return el;
  219. 			}
  220. 			el = el.parentNode;
  221. 		}
  222. 		return null;
  223. 	}
  224.  
  225. 	function remove(selector, el) {
  226. 		let els = $$(selector, el),
  227. 			index = els.length;
  228. 		while (index--) {
  229. 			els[index].parentNode.removeChild(els[index]);
  230. 		}
  231. 	}
  232.  
  233. 	function removeSelection() {
  234. 		// remove text selection - https://stackoverflow.com/a/3171348/145346
  235. 		const sel = window.getSelection ?
  236. 			window.getSelection() :
  237. 			document.selection;
  238. 		if (sel) {
  239. 			if (sel.removeAllRanges) {
  240. 				sel.removeAllRanges();
  241. 			} else if (sel.empty) {
  242. 				sel.empty();
  243. 			}
  244. 		}
  245. 	}
  246.  
  247. 	document.addEventListener("ghmo:container", addCodeFolding);
  248. 	addCodeFolding();
  249. 	addBindings();
  250.  
  251. })();