Github Comment Enhancer

Enhances Github comments

ของเมื่อวันที่ 21-03-2015 ดู เวอร์ชันล่าสุด

คุณจะต้องติดตั้งส่วนขยาย เช่น Tampermonkey, Greasemonkey หรือ Violentmonkey เพื่อติดตั้งสคริปต์นี้

คุณจะต้องติดตั้งส่วนขยาย เช่น Tampermonkey หรือ Violentmonkey เพื่อติดตั้งสคริปต์นี้

คุณจะต้องติดตั้งส่วนขยาย เช่น Tampermonkey หรือ Violentmonkey เพื่อติดตั้งสคริปต์นี้

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @id          Github_Comment_Enhancer@https://github.com/jerone/UserScripts
// @name        Github Comment Enhancer
// @namespace   https://github.com/jerone/UserScripts
// @description Enhances Github comments
// @author      jerone
// @copyright   2014+, jerone (http://jeroenvanwarmerdam.nl)
// @license     GNU GPLv3
// @homepage    https://github.com/jerone/UserScripts/tree/master/Github_Comment_Enhancer
// @homepageURL https://github.com/jerone/UserScripts/tree/master/Github_Comment_Enhancer
// @supportURL  https://github.com/jerone/UserScripts/issues
// @contributionURL https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=VCYMHWQ7ZMBKW
// @version     2.2.0
// @grant       none
// @run-at      document-end
// @include     https://github.com/*/*/issues
// @include     https://github.com/*/*/issues/*
// @include     https://github.com/*/*/pulls
// @include     https://github.com/*/*/pull/*
// @include     https://github.com/*/*/commit/*
// @include     https://github.com/*/*/compare/*
// @include     https://github.com/*/*/wiki/*
// @include     https://gist.github.com/*
// ==/UserScript==
/* global unsafeWindow */

(function(unsafeWindow) {

	String.format = function(string) {
		var args = Array.prototype.slice.call(arguments, 1, arguments.length);
		return string.replace(/{(\d+)}/g, function(match, number) {
			return typeof args[number] !== "undefined" ? args[number] : match;
		});
	};

	// Source: https://github.com/gollum/gollum/blob/9c714e768748db4560bc017cacef4afa0c751a63/lib/gollum/public/gollum/javascript/editor/langs/markdown.js
	var MarkDown = (function MarkDown() {
		return {
			"function-bold": {
				search: /^(\s*)([\s\S]*?)(\s*)$/g,
				replace: "$1**$2**$3"
			},
			"function-italic": {
				search: /^(\s*)([\s\S]*?)(\s*)$/g,
				replace: "$1_$2_$3"
			},
			"function-strikethrough": {
				search: /^(\s*)([\s\S]*?)(\s*)$/g,
				replace: "$1~~$2~~$3"
			},

			"function-h1": {
				search: /(.+)([\n]?)/g,
				replace: "# $1$2",
				forceNewline: true
			},
			"function-h2": {
				search: /(.+)([\n]?)/g,
				replace: "## $1$2",
				forceNewline: true
			},
			"function-h3": {
				search: /(.+)([\n]?)/g,
				replace: "### $1$2",
				forceNewline: true
			},
			"function-h4": {
				search: /(.+)([\n]?)/g,
				replace: "#### $1$2",
				forceNewline: true
			},
			"function-h5": {
				search: /(.+)([\n]?)/g,
				replace: "##### $1$2",
				forceNewline: true
			},
			"function-h6": {
				search: /(.+)([\n]?)/g,
				replace: "###### $1$2",
				forceNewline: true
			},

			"function-link": {
				exec: function(button, selText, commentForm, next) {
					var selTxt = selText.trim(),
						isUrl = selTxt && /(?:https?:\/\/)|(?:www\.)/.test(selTxt),
						href = window.prompt("Link href:", isUrl ? selTxt : ""),
						text = window.prompt("Link text:", isUrl ? "" : selTxt);
					if (href) {
						next(String.format("[{0}]({1}){2}", text || href, href, (/\s+$/.test(selText) ? " " : "")));
					}
				}
			},
			"function-image": {
				exec: function(button, selText, commentForm, next) {
					var selTxt = selText.trim(),
						isUrl = selTxt && /(?:https?:\/\/)|(?:www\.)/.test(selTxt),
						href = window.prompt("Image href:", isUrl ? selTxt : ""),
						text = window.prompt("Image text:", isUrl ? "" : selTxt);
					if (href) {
						next(String.format("![{0}]({1}){2}", text || href, href, (/\s+$/.test(selText) ? " " : "")));
					}
				}
			},

			"function-ul": {
				search: /(.+)([\n]?)/g,
				replace: "* $1$2",
				forceNewline: true
			},
			"function-ol": {
				exec: function(button, selText, commentForm, next) {
					var repText = "";
					if (!selText) {
						repText = "1. ";
					} else {
						var lines = selText.split("\n"),
							hasContent = /[\w]+/;
						for (var i = 0; i < lines.length; i++) {
							if (hasContent.test(lines[i])) {
								repText += String.format("{0}. {1}\n", i + 1, lines[i]);
							}
						}
					}
					next(repText);
				}
			},
			"function-checklist": {
				search: /(.+)([\n]?)/g,
				replace: "* [ ] $1$2",
				forceNewline: true
			},

			"function-code": {
				exec: function(button, selText, commentForm, next) {
					var rt = selText.indexOf("\n") > -1 ? "$1\n```\n$2\n```$3" : "$1`$2`$3";
					next(selText.replace(/^(\s*)([\s\S]*?)(\s*)$/g, rt));
				}
			},
			"function-blockquote": {
				search: /(.+)([\n]?)/g,
				replace: "> $1$2",
				forceNewline: true
			},
			"function-hr": {
				append: "\n***\n",
				forceNewline: true
			},
			"function-table": {
				append: "\n" +
					"| Head | Head | Head |\n" +
					"| :--- | :--: | ---: |\n" +
					"| Cell | Cell | Cell |\n" +
					"| Cell | Cell | Cell |\n",
				forceNewline: true
			},

			"function-clear": {
				exec: function(button, selText, commentForm, next) {
					commentForm.value = "";
					next("");
				}
			},

			"function-snippets-tab": {
				exec: function(button, selText, commentForm, next) {
					next("\t");
				}
			},
			"function-snippets-useragent": {
				exec: function(button, selText, commentForm, next) {
					next("`" + navigator.userAgent + "`");
				}
			},
			"function-snippets-contributing": {
				exec: function(button, selText, commentForm, next) {
					next("Please, always consider reviewing the [guidelines for contributing](../blob/master/CONTRIBUTING.md) to this repository.");
				}
			},

			"function-emoji": {
				exec: function(button, selText, commentForm, next) {
					next(":" + button.dataset.value + ":");
				}
			}
		};
	})();

	var editorHTML = (function editorHTML() {
		return '<div id="gollum-editor-function-buttons" style="float: left;">' +
			'	<div class="button-group btn-group">' +
			'		<a href="#" id="function-bold" class="btn btn-sm minibutton function-button tooltipped tooltipped-ne" aria-label="Bold" style="height:26px;">' +
			'			<b style="font-weight: bolder;">B</b>' +
			'		</a>' +
			'		<a href="#" id="function-italic" class="btn btn-sm minibutton function-button tooltipped tooltipped-ne" aria-label="Italic">' +
			'			<em>i</em>' +
			'		</a>' +
			'		<a href="#" id="function-strikethrough" class="btn btn-sm minibutton function-button tooltipped tooltipped-ne" aria-label="Strikethrough">' +
			'			<s>S</s>' +
			'		</a>' +
			'	</div>' +

			'	<div class="button-group btn-group">' +
			'		<div class="select-menu js-menu-container js-select-menu">' +
			'			<span class="btn btn-sm minibutton select-menu-button icon-only js-menu-target" aria-label="Headers" style="padding-left:7px; padding-right:7px; width:auto; border-bottom-right-radius:3px; border-top-right-radius:3px;">' +
			'		<span class="js-select-button">h#</span>' +
			'			</span>' +
			'			<div class="select-menu-modal-holder js-menu-content js-navigation-container js-active-navigation-container" style="top: 26px;">' +
			'				<div class="select-menu-modal" style="width:auto; overflow:visible;">' +
			'					<div class="select-menu-header">' +
			'						<span class="select-menu-title">Choose header</span>' +
			'						<span class="octicon octicon-remove-close js-menu-close"></span>' +
			'					</div>' +
			'					<div class="button-group btn-group">' +
			'						<a href="#" id="function-h1" class="btn btn-sm minibutton function-button js-navigation-item js-menu-close tooltipped tooltipped-s" aria-label="Header 1">' +
			'							<b class="select-menu-item-text js-select-button-text">h1</b>' +
			'						</a>' +
			'						<a href="#" id="function-h2" class="btn btn-sm minibutton function-button js-navigation-item js-menu-close tooltipped tooltipped-s" aria-label="Header 2">' +
			'							<b class="select-menu-item-text js-select-button-text">h2</b>' +
			'						</a>' +
			'						<a href="#" id="function-h3" class="btn btn-sm minibutton function-button js-navigation-item js-menu-close tooltipped tooltipped-s" aria-label="Header 3">' +
			'							<b class="select-menu-item-text js-select-button-text">h3</b>' +
			'						</a>' +
			'						<a href="#" id="function-h4" class="btn btn-sm minibutton function-button js-navigation-item js-menu-close tooltipped tooltipped-s" aria-label="Header 4">' +
			'							<b class="select-menu-item-text js-select-button-text">h4</b>' +
			'						</a>' +
			'						<a href="#" id="function-h5" class="btn btn-sm minibutton function-button js-navigation-item js-menu-close tooltipped tooltipped-s" aria-label="Header 5">' +
			'							<b class="select-menu-item-text js-select-button-text">h5</b>' +
			'						</a>' +
			'						<a href="#" id="function-h6" class="btn btn-sm minibutton function-button js-navigation-item js-menu-close tooltipped tooltipped-s" aria-label="Header 6">' +
			'							<b class="select-menu-item-text js-select-button-text">h6</b>' +
			'						</a>' +
			'					</div>' +
			'				</div>' +
			'			</div>' +
			'		</div>' +
			'	</div>' +

			'	<div class="button-group btn-group">' +
			'		<a href="#" id="function-link" class="btn btn-sm minibutton function-button tooltipped tooltipped-ne" aria-label="Link">' +
			'			<span class="octicon octicon-link"></span>' +
			'		</a>' +
			'		<a href="#" id="function-image" class="btn btn-sm minibutton function-button tooltipped tooltipped-ne" aria-label="Image">' +
			'			<span class="octicon octicon-file-media"></span>' +
			'		</a>' +
			'	</div>' +
			'	<div class="button-group btn-group">' +
			'		<a href="#" id="function-ul" class="btn btn-sm minibutton function-button tooltipped tooltipped-ne" aria-label="Unordered List">' +
			'			<span class="octicon octicon-list-unordered"></span>' +
			'		</a>' +
			'		<a href="#" id="function-ol" class="btn btn-sm minibutton function-button tooltipped tooltipped-ne" aria-label="Ordered List">' +
			'			<span class="octicon octicon-list-ordered"></span>' +
			'		</a>' +
			'		<a href="#" id="function-checklist" class="btn btn-sm minibutton function-button tooltipped tooltipped-ne" aria-label="Task List">' +
			'			<span class="octicon octicon-checklist"></span>' +
			'		</a>' +
			'	</div>' +

			'	<div class="button-group btn-group">' +
			'		<a href="#" id="function-code" class="btn btn-sm minibutton function-button tooltipped tooltipped-ne" aria-label="Code">' +
			'			<span class="octicon octicon-code"></span>' +
			'		</a>' +
			'		<a href="#" id="function-blockquote" class="btn btn-sm minibutton function-button tooltipped tooltipped-ne" aria-label="Blockquote">' +
			'			<span class="octicon octicon-quote"></span>' +
			'		</a>' +
			'		<a href="#" id="function-hr" class="btn btn-sm minibutton function-button tooltipped tooltipped-ne" aria-label="Horizontal Rule">' +
			'			<span class="octicon octicon-horizontal-rule"></span>' +
			'		</a>' +
			'		<a href="#" id="function-table" class="btn btn-sm minibutton function-button tooltipped tooltipped-ne" aria-label="Table">' +
			'			<span class="octicon octicon-three-bars"></span>' +
			'		</a>' +
			'	</div>' +

			'	<div class="button-group btn-group">' +
			'		<div class="select-menu js-menu-container js-select-menu">' +
			'			<span class="btn btn-sm minibutton select-menu-button js-menu-target" aria-label="Snippets" style="padding-left:7px; padding-right:7px; width:auto; border-bottom-right-radius:3px; border-top-right-radius:3px;">' +
			'				<span class="octicon octicon-pin"></span>' +
			'			</span>' +
			'			<div class="select-menu-modal-holder js-menu-content js-navigation-container js-active-navigation-container">' +
			'				<div class="select-menu-modal" style="overflow:visible;">' +
			'					<div class="select-menu-header">' +
			'						<span class="select-menu-title">Snippets</span>' +
			'						<span class="octicon octicon-remove-close js-menu-close"></span>' +
			'					</div>' +
			'					<div class="select-menu-filters">' +
			'						<div class="select-menu-text-filter">' +
			'							<input type="text" placeholder="Filter snippets..." class="js-filterable-field js-navigation-enable" id="context-snippets-filter-field">' +
			'						</div>' +
			'					</div>' +
			'					<div class="select-menu-list" style="overflow:visible;">' +
			'						<div data-filterable-type="substring" data-filterable-for="context-snippets-filter-field">' +
			'							<a href="#" id="function-snippets-tab" class="function-button select-menu-item js-navigation-item tooltipped tooltipped-w" aria-label="Add tab character" style="table-layout:initial;">' +
			'								<span class="select-menu-item-text js-select-button-text">Add tab character</span>' +
			'							</a>' +
			'							<a href="#" id="function-snippets-useragent" class="function-button select-menu-item js-navigation-item tooltipped tooltipped-w" aria-label="Add UserAgent" style="table-layout:initial;">' +
			'								<span class="select-menu-item-text js-select-button-text">Add UserAgent</span>' +
			'							</a>' +
			'							<a href="#" id="function-snippets-contributing" class="function-button select-menu-item js-navigation-item tooltipped tooltipped-w" aria-label="Add contributing message" style="table-layout:initial;">' +
			'								<span class="select-menu-item-text">' +
			'									<span class="js-select-button-text">Contributing</span>' +
			'									<span class="description">Add contributing message</span>' +
			'								</span>' +
			'							</a>' +
			'						</div>' +
			'						<div class="select-menu-no-results">Nothing to show</div>' +
			'					</div>' +
			'				</div>' +
			'			</div>' +
			'		</div>' +
			'	</div>' +

			'	<div class="button-group btn-group">' +
			'		<div class="select-menu js-menu-container js-select-menu">' +
			'			<span class="btn btn-sm minibutton select-menu-button js-menu-target" aria-label="Emoji" style="padding-left:7px; padding-right:7px; width:auto; border-bottom-right-radius:3px; border-top-right-radius:3px;">' +
			'				<span class="octicon octicon-octoface"></span>' +
			'			</span>' +
			'			<div class="select-menu-modal-holder js-menu-content js-navigation-container js-active-navigation-container">' +
			'				<div class="select-menu-modal" style="overflow:visible;">' +
			'					<div class="select-menu-header">' +
			'						<span class="select-menu-title">Emoji</span>' +
			'						<span class="octicon octicon-remove-close js-menu-close"></span>' +
			'					</div>' +
			'					<div class="select-menu-filters">' +
			'						<div class="select-menu-text-filter">' +
			'							<input type="text" placeholder="Filter emoji..." class="js-filterable-field js-navigation-enable" id="context-emoji-filter-field">' +
			'						</div>' +
			'					</div>' +
			'					<div class="suggester select-menu-list" style="overflow:visible;">' +
			'						<div class="select-menu-no-results">Nothing to show</div>' +
			'					</div>' +
			'				</div>' +
			'			</div>' +
			'		</div>' +
			'	</div>' +

			'</div>' +

			'<div style="float:right;">' +
			'	<a href="#" id="function-clear" class="btn btn-sm minibutton function-button tooltipped tooltipped-nw" aria-label="Clear">' +
			'		<span class="octicon octicon-circle-slash"></span>' +
			'	</a>' +
			'</div>';
	})();

	// Source: https://github.com/gollum/gollum/blob/9c714e768748db4560bc017cacef4afa0c751a63/lib/gollum/public/gollum/javascript/editor/gollum.editor.js#L516
	function executeAction(definitionObject, commentForm, button) {
		var txt = commentForm.value,
			selPos = {
				start: commentForm.selectionStart,
				end: commentForm.selectionEnd
			},
			selText = txt.substring(selPos.start, selPos.end),
			repText = selText,
			reselect = true,
			cursor = null;

		// execute replacement function;
		if (definitionObject.exec) {
			definitionObject.exec(button, selText, commentForm, function(repText) {
				replaceFieldSelection(commentForm, repText);
			});
			return;
		}

		// execute a search;
		var searchExp = new RegExp(definitionObject.search || /([^\n]+)/gi);

		// replace text;
		if (definitionObject.replace) {
			var rt = definitionObject.replace;
			repText = repText.replace(searchExp, rt);
			repText = repText.replace(/\$[\d]/g, "");
			if (repText === "") {
				cursor = rt.indexOf("$1");
				repText = rt.replace(/\$[\d]/g, "");
				if (cursor === -1) {
					cursor = Math.floor(rt.length / 2);
				}
			}
		}

		// append if necessary;
		if (definitionObject.append) {
			if (repText === selText) {
				reselect = false;
			}
			repText += definitionObject.append;
		}

		if (repText) {
			if (definitionObject.forceNewline === true && (selPos.start > 0 && txt.substr(Math.max(0, selPos.start - 1), 1) !== "\n")) {
				repText = "\n" + repText;
			}
			replaceFieldSelection(commentForm, repText, reselect, cursor);
		}
	}

	// Source: https://github.com/gollum/gollum/blob/9c714e768748db4560bc017cacef4afa0c751a63/lib/gollum/public/gollum/javascript/editor/gollum.editor.js#L708
	function replaceFieldSelection(commentForm, replaceText, reselect, cursorOffset) {
		var txt = commentForm.value,
			selPos = {
				start: commentForm.selectionStart,
				end: commentForm.selectionEnd
			};

		var selectNew = true;
		if (reselect === false) {
			selectNew = false;
		}

		var scrollTop = null;
		if (commentForm.scrollTop) {
			scrollTop = commentForm.scrollTop;
		}

		commentForm.value = txt.substring(0, selPos.start) + replaceText + txt.substring(selPos.end);
		commentForm.focus();

		if (selectNew) {
			if (cursorOffset) {
				commentForm.setSelectionRange(selPos.start + cursorOffset, selPos.start + cursorOffset);
			} else {
				commentForm.setSelectionRange(selPos.start, selPos.start + replaceText.length);
			}
		}

		if (scrollTop) {
			commentForm.scrollTop = scrollTop;
		}
	}

	function isWiki() {
		return /\/wiki\//.test(location.href);
	}

	function isGist() {
		return location.host === "gist.github.com";
	}

	function overrideGollumMarkdown() {
		unsafeWindow.$.GollumEditor.defineLanguage("markdown", MarkDown);
	}

	function unbindGollumFunctions() {
		window.setTimeout(function() {
			unsafeWindow.$(".function-button:not(#function-help)").unbind("click");
		}, 1);
	}

	var functionButtonClick = function(e) {
		e.preventDefault();
		executeAction(MarkDown[this.id], this.commentForm, this);
		return false;
	};

	function addSuggestions(commentForm) {
		var jssuggester = commentForm.parentNode.parentNode.querySelector(".js-suggester-container .js-suggester");
		var url = jssuggester.getAttribute("data-url");
		unsafeWindow.$.fetchText(url).then(function(suggestionsData) {
			suggestionsData = suggestionsData.replace(/js-navigation-item/g, "function-button js-navigation-item select-menu-item");

			var suggestions = document.createElement("div");
			suggestions.innerHTML = suggestionsData;

			var emojiSuggestions = suggestions.querySelector(".emoji-suggestions");
			emojiSuggestions.style.display = "block";
			emojiSuggestions.dataset.filterableType = "substring";
			emojiSuggestions.dataset.filterableFor = "context-emoji-filter-field";
			emojiSuggestions.dataset.filterableLimit = "10";

			var suggester = commentForm.parentNode.querySelector(".suggester");
			suggester.style.display = "block";
			suggester.style.marginTop = "0";
			suggester.appendChild(emojiSuggestions);
			Array.prototype.forEach.call(suggester.querySelectorAll(".function-button"), function(button) {
				button.addEventListener("click", function(e) {
					e.preventDefault();
					executeAction(MarkDown["function-emoji"], commentForm, this);
					return false;
				});
			});
		});
	}

	function addToolbar() {
		if (isWiki()) {
			// Override existing language with improved & missing functions and remove existing click events;
			overrideGollumMarkdown();
			unbindGollumFunctions();

			// Remove existing click events when changing languages;
			document.getElementById("wiki_format").addEventListener("change", function() {
				unbindGollumFunctions();

				Array.prototype.forEach.call(document.querySelectorAll(".comment-form-textarea .function-button"), function(button) {
					button.removeEventListener("click", functionButtonClick);
				});
			});
		}

		Array.prototype.forEach.call(document.querySelectorAll(".comment-form-textarea,.js-comment-field"), function(commentForm) {
			var gollumEditor;
			if (commentForm.classList.contains("GithubCommentEnhancer")) {
				gollumEditor = commentForm.previousSibling;
			} else {
				commentForm.classList.add("GithubCommentEnhancer");

				if (isWiki()) {
					gollumEditor = document.getElementById("gollum-editor-function-bar");
					var temp = document.createElement("div");
					temp.innerHTML = editorHTML;
					temp.firstElementChild.appendChild(document.getElementById("function-help")); // restore the help button;
					gollumEditor.replaceChild(temp.querySelector("#gollum-editor-function-buttons"), document.getElementById("gollum-editor-function-buttons"));
					Array.prototype.forEach.call(temp.children, function(elm) {
						elm.style.position = "absolute";
						elm.style.right = "30px";
						elm.style.top = "0";
						commentForm.parentNode.insertBefore(elm, commentForm);
					});
					temp = null;
				} else {
					gollumEditor = document.createElement("div");
					gollumEditor.innerHTML = editorHTML;
					gollumEditor.id = "gollum-editor-function-bar";
					gollumEditor.style.height = "26px";
					gollumEditor.style.margin = "10px 0";
					gollumEditor.classList.add("active");
					commentForm.parentNode.insertBefore(gollumEditor, commentForm);
				}

				addSuggestions(commentForm);

				var tabnavExtras = commentForm.parentNode.parentNode.querySelector(".comment-form-head .tabnav-right, .comment-form-head .right");
				if (tabnavExtras) {
					var sponsored = document.createElement("a");
					sponsored.setAttribute("target", "_blank");
					sponsored.setAttribute("href", "https://github.com/jerone/UserScripts/tree/master/Github_Comment_Enhancer");
					sponsored.classList.add("tabnav-widget", "text", "tabnav-extras", "tabnav-extra");
					var sponsoredIcon = document.createElement("span");
					sponsoredIcon.classList.add("octicon", "octicon-question");
					sponsored.appendChild(sponsoredIcon);
					sponsored.appendChild(document.createTextNode("Enhanced by Github Comment Enhancer"));
					tabnavExtras.insertBefore(sponsored, tabnavExtras.firstElementChild);
				}
			}

			if (isGist()) {
				Array.prototype.forEach.call(gollumEditor.parentNode.querySelectorAll(".select-menu-button"), function(button) {
					button.style.paddingRight = "25px";
				});
			}

			Array.prototype.forEach.call(gollumEditor.parentNode.querySelectorAll(".function-button"), function(button) {
				if (isGist() && button.classList.contains("minibutton")) {
					button.style.padding = "0px";
					button.style.textAlign = "center";
					button.style.width = "30px";
					button.firstElementChild.style.marginRight = "0px";
				}
				button.commentForm = commentForm; // remove event listener doesn't accept `bind`;
				button.addEventListener("click", functionButtonClick);
			});
		});
	}

	// Source: https://github.com/domchristie/to-markdown
	// Code is altered with task list support: https://github.com/domchristie/to-markdown/pull/62
	var toMarkdown = function(string) {

		var ELEMENTS = [{
			patterns: 'p',
			replacement: function(str, attrs, innerHTML) {
				return innerHTML ? '\n\n' + innerHTML + '\n' : '';
			}
		}, {
			patterns: 'br',
			type: 'void',
			replacement: '  \n'
		}, {
			patterns: 'h([1-6])',
			replacement: function(str, hLevel, attrs, innerHTML) {
				var hPrefix = '';
				for (var i = 0; i < hLevel; i++) {
					hPrefix += '#';
				}
				return '\n\n' + hPrefix + ' ' + innerHTML + '\n';
			}
		}, {
			patterns: 'hr',
			type: 'void',
			replacement: '\n\n* * *\n'
		}, {
			patterns: 'a',
			replacement: function(str, attrs, innerHTML) {
				var href = attrs.match(attrRegExp('href')),
					title = attrs.match(attrRegExp('title'));
				return href ? '[' + innerHTML + ']' + '(' + href[1] + (title && title[1] ? ' "' + title[1] + '"' : '') + ')' : str;
			}
		}, {
			patterns: ['b', 'strong'],
			replacement: function(str, attrs, innerHTML) {
				return innerHTML ? '**' + innerHTML + '**' : '';
			}
		}, {
			patterns: ['i', 'em'],
			replacement: function(str, attrs, innerHTML) {
				return innerHTML ? '_' + innerHTML + '_' : '';
			}
		}, {
			patterns: 'code',
			replacement: function(str, attrs, innerHTML) {
				return innerHTML ? '`' + innerHTML + '`' : '';
			}
		}, {
			patterns: 'img',
			type: 'void',
			replacement: function(str, attrs, innerHTML) {
				var src = attrs.match(attrRegExp('src')),
					alt = attrs.match(attrRegExp('alt')),
					title = attrs.match(attrRegExp('title'));
				return src ? '![' + (alt && alt[1] ? alt[1] : '') + ']' + '(' + src[1] + (title && title[1] ? ' "' + title[1] + '"' : '') + ')' : '';
			}
		}];

		for (var i = 0, len = ELEMENTS.length; i < len; i++) {
			if (typeof ELEMENTS[i].patterns === 'string') {
				string = replaceEls(string, {
					tag: ELEMENTS[i].patterns,
					replacement: ELEMENTS[i].replacement,
					type: ELEMENTS[i].type
				});
			} else {
				for (var j = 0, pLen = ELEMENTS[i].patterns.length; j < pLen; j++) {
					string = replaceEls(string, {
						tag: ELEMENTS[i].patterns[j],
						replacement: ELEMENTS[i].replacement,
						type: ELEMENTS[i].type
					});
				}
			}
		}

		function replaceEls(html, elProperties) {
			var pattern = elProperties.type === 'void' ? '<' + elProperties.tag + '\\b([^>]*)\\/?>' : '<' + elProperties.tag + '\\b([^>]*)>([\\s\\S]*?)<\\/' + elProperties.tag + '>',
				regex = new RegExp(pattern, 'gi'),
				markdown = '';
			if (typeof elProperties.replacement === 'string') {
				markdown = html.replace(regex, elProperties.replacement);
			} else {
				markdown = html.replace(regex, function(str, p1, p2, p3) {
					return elProperties.replacement.call(this, str, p1, p2, p3);
				});
			}
			return markdown;
		}

		function attrRegExp(attr) {
			return new RegExp(attr + '\\s*=\\s*["\']?([^"\']*)["\']?', 'i');
		}

		// Pre code blocks

		string = string.replace(/<pre\b[^>]*>`([\s\S]*?)`<\/pre>/gi, function(str, innerHTML) {
			var text = innerHTML;
			text = text.replace(/^\t+/g, '  '); // convert tabs to spaces (you know it makes sense)
			text = text.replace(/\n/g, '\n    ');
			return '\n\n    ' + text + '\n';
		});

		// Lists

		// Escape numbers that could trigger an ol
		// If there are more than three spaces before the code, it would be in a pre tag
		// Make sure we are escaping the period not matching any character
		string = string.replace(/^(\s{0,3}\d+)\. /g, '$1\\. ');

		// Converts lists that have no child lists (of same type) first, then works its way up
		var noChildrenRegex = /<(ul|ol)\b[^>]*>(?:(?!<ul|<ol)[\s\S])*?<\/\1>/gi;
		while (string.match(noChildrenRegex)) {
			string = string.replace(noChildrenRegex, function(str) {
				return replaceLists(str);
			});
		}

		function replaceLists(html) {

			html = html.replace(/<(ul|ol)\b[^>]*>([\s\S]*?)<\/\1>/gi, function(str, listType, innerHTML) {
				var lis = innerHTML.split('</li>');
				lis.splice(lis.length - 1, 1);

				for (i = 0, len = lis.length; i < len; i++) {
					if (lis[i]) {
						var prefix = (listType === 'ol') ? (i + 1) + ".  " : "*   ";
						lis[i] = lis[i].replace(/\s*<li[^>]*>([\s\S]*)/i, function(str, innerHTML) {
							innerHTML = innerHTML.replace(/\s*<input[^>]*?(checked[^>]*)?type=['"]?checkbox['"]?[^>]>/, function(inputStr, checked) {
								return checked ? '[X]' : '[ ]';
							});
							innerHTML = innerHTML.replace(/^\s+/, '');
							innerHTML = innerHTML.replace(/\n\n/g, '\n\n    ');
							// indent nested lists
							innerHTML = innerHTML.replace(/\n([ ]*)+(\*|\d+\.) /g, '\n$1    $2 ');
							return prefix + innerHTML;
						});
					}
					lis[i] = lis[i].replace(/(.) +$/m, '$1');
				}
				return lis.join('\n');
			});

			return '\n\n' + html.replace(/[ \t]+\n|\s+$/g, '');
		}

		// Blockquotes
		var deepest = /<blockquote\b[^>]*>((?:(?!<blockquote)[\s\S])*?)<\/blockquote>/gi;
		while (string.match(deepest)) {
			string = string.replace(deepest, function(str) {
				return replaceBlockquotes(str);
			});
		}

		function replaceBlockquotes(html) {
			html = html.replace(/<blockquote\b[^>]*>([\s\S]*?)<\/blockquote>/gi, function(str, inner) {
				inner = inner.replace(/^\s+|\s+$/g, '');
				inner = cleanUp(inner);
				inner = inner.replace(/^/gm, '> ');
				inner = inner.replace(/^(>([ \t]{2,}>)+)/gm, '> >');
				return inner;
			});
			return html;
		}

		function cleanUp(string) {
			string = string.replace(/^[\t\r\n]+|[\t\r\n]+$/g, ''); // trim leading/trailing whitespace
			string = string.replace(/\n\s+\n/g, '\n\n');
			string = string.replace(/\n{3,}/g, '\n\n'); // limit consecutive linebreaks to 2
			return string;
		}

		return cleanUp(string);
	};

	function addReplyButtons() {
		Array.prototype.forEach.call(document.querySelectorAll(".comment"), function(comment) {
			var oldReply = comment.querySelector(".GithubCommentEnhancerReply");
			if (oldReply) {
				oldReply.parentNode.removeChild(oldReply);
			}

			var header = comment.querySelector(".timeline-comment-header"),
				actions = comment.querySelector(".timeline-comment-actions"),
				newComment = document.querySelector(".timeline-new-comment .comment-form-textarea");

			if (!header) {
				return;
			}
			if (!actions) {
				actions = document.createElement("div");
				actions.classList.add("timeline-comment-actions");
				header.insertBefore(actions, header.firstElementChild);
			}

			var reply = document.createElement("a");
			reply.setAttribute("href", "#");
			reply.setAttribute("aria-label", "Reply to this comment");
			reply.classList.add("GithubCommentEnhancerReply", "timeline-comment-action", "tooltipped", "tooltipped-ne");
			reply.addEventListener("click", function(e) {
				e.preventDefault();

				var timestamp = comment.querySelector(".timestamp");

				var commentText = comment.querySelector(".comment-form-textarea");
				if (commentText) {
					commentText = commentText.value;
				} else {
					commentText = toMarkdown(comment.querySelector(".comment-body").innerHTML);
				}
				commentText = commentText.trim().split("\n").map(function(line) {
					return "> " + line;
				}).join("\n");

				var text = newComment.value.length > 0 ? "\n" : "";
				text += String.format('@{0} commented on [{1}]({2} "{3} - Replied by Github Comment Enhancer"):\n{4}\n\n',
					comment.querySelector(".author").textContent,
					timestamp.firstElementChild.getAttribute("title"),
					timestamp.href,
					timestamp.firstElementChild.getAttribute("datetime"),
					commentText);

				newComment.value += text;
				newComment.setSelectionRange(newComment.value.length, newComment.value.length);
				newComment.focus();
			});

			var replyIcon = document.createElement("span");
			replyIcon.classList.add("octicon", "octicon-mail-reply");
			reply.appendChild(replyIcon);

			actions.appendChild(reply);
		});
	}

	// init;
	function init() {
		addToolbar();
		addReplyButtons();
	}
	init();

	// on pjax;
	unsafeWindow.$(document).on("pjax:end", init); // `pjax:end` also runs on history back;

	// for inline comments;
	var files = document.querySelectorAll('.file-code');
	Array.prototype.forEach.call(files, function(file) {
		file = file.firstElementChild;
		new MutationObserver(function(mutations) {
			mutations.forEach(function(mutation) {
				if (mutation.target === file) {
					addToolbar();
				}
			});
		}).observe(file, {
			childList: true,
			subtree: true
		});
	});

})(typeof unsafeWindow !== "undefined" ? unsafeWindow : window);