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[UPDATED] Reddit - Top Comments Preview (old & new design)

Preview to the top comments on Reddit (+ optional auto-load comments and images, auto-hide sidebar)

// ==UserScript==
// @name           [UPDATED] Reddit - Top Comments Preview (old & new design)
// @namespace      https://greasyfork.org/users/1007060-humzakh
// @author         jesuis-parapluie > humzakh
// @version        3.03
// @description    Preview to the top comments on Reddit (+ optional auto-load comments and images, auto-hide sidebar)
// @homepageURL    https://github.com/humzakh/userscripts/tree/master/Reddit%20-%20Top%20Comments%20Preview
// @require        https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js
// @include        /^https?:\/\/(.+\.)?reddit\.com\/?.*$/
// @exclude        /^https?:\/\/(.+\.)?reddit\.com\/r\/.*\/comments\/.*$/
// @grant          GM_getValue
// @grant          GM_setValue
// ==/UserScript==
(function ($) {
  "use strict";
  /*jshint validthis: true */
  /*jslint browser: true, regexp: true, newcap: true */
  /*global $, jQuery, GM_getValue, GM_setValue, MutationObserver */
  var options = {
      /* Number of comments to display */
      topComments: 3,
      /* Sortings available: top, best, new, hot, controversial, old */
      commentSorting: "top",
      /* Show comments at the top of items */
      commentsAtTop: false,
      /* Don't show (pinned) comments from following users */
      skipCommentsFrom: ["AutoModerator", "WholesomeBot", "PoliticalHumorBot", "SavageAxeBot", "movieDetailsModBot", "WritingPromptsRobot"],
      /* Disable sidebar button in menu bar */
      disableSidebarButton: false,
      /* Disable autoload buttons in menu bar */
      disableAutoloadButton: false,
      /* Disable RES keyboard shortcut 't' to show/hide comments */
      disableShortCut: false
    },
    helper = {
      prefix: {
        item: "item-",
        id: "toplink-",
        box: "commentpreview-"
      },
      layout: {
        prefix: "layoutSwitch--",
        0: "card",
        1: "classic",
        2: "compact",
        active: ""
      },
      findLayout: function () {
        var i, j, colors = [],
          counts = {};

        for (i = 0; i <= 2; i += 1) {
          colors.push($("#" + helper.layout.prefix + helper.layout[i]).find("svg").css("fill"));
        }

        $.each(colors, function (value) {
          if (!counts.hasOwnProperty(value)) {
            counts[value] = 1;
          } else {
            counts[value] += 1;
          }
        });

        for (j in counts) {
          if (counts[j] === 1) {
            for (i = 0; i <= 2; i += 1) {
              if (colors[i] === j) {
                helper.layout.active = helper.layout[i];
                break;
              }
            }
          }
        }
      },
      toggleView: function (className) {
        (function (style) {
          style.display = style.display === "none" ? "" : "none";
        }(document.querySelector(className).style));
      }
    },
    design = {
      active: "new",
      new: {
        style: [
          ".aubox a.disabled{color:#995F5F;font-weight:400} .aubox a.enabled{color:#009D2D;font-weight:400} a#sidebarswitch{cursor:pointer}",
          "div.topbar{padding: 0 10px 0 10px;} div.topbar span{padding: 0 0 0 5px;} div.commentbox hr { border-color: #777; opacity: 0.2; }",
          "div.commentbox{-moz-box-sizing:border-box;-webkit-box-sizing:border-box;box-sizing:border-box;border-radius:5px;border:1px solid;white-space:normal;padding:5px;margin:8px 0}",
          "div.commentbox .md{border:1px solid rgb(120,120,120,0.4);-moz-box-sizing:border-box;-webkit-box-sizing:border-box;box-sizing:border-box;margin:3px 0;box-sizing:border-box;padding:2px 8px}",
          ".loaderror:before{content:' loading failed ';color:red} .loading:before{content:'Loading...'} .loading{color:rgb(79, 188, 255)} .res-nightmode .loaderror:before{content:' loading failed ';color:#E63A3A}",
          "div.commentbox .md *{white-space:normal} div.commentbox .md code{white-space:pre} div.commentbox .md pre{overflow:visible} div.commentbox>*{font-size:small}",
          "div.commentbox .ulink,div.commentbox .md a{font-weight:700} .listing-page .buttons li{vertical-align:top} .toplink{color:#FF4500!important;text-decoration:none;height: 14px; padding: 0 4px 0 4px;}",
          ".permalink{float:right;color:#666;margin-left:.5em} .points{font-weight:700;margin-left:.5em}"
        ].join(""),
        items_selector: ".scrollerItem",
        menubar_element: "<div>",
        menubar_parent: $("#view--layout--FUE").parent(),
        expando_button: ".icon-expandoArrowExpand",
        comment_link: "a[data-click-id=comments]"

      },
      old: {
        style: [
          ".aubox a.disabled{color:#995F5F;font-weight:400} .aubox a.enabled{color:#009D2D;font-weight:400} a#sidebarswitch{cursor:pointer}",
          "div.commentbox{-moz-box-sizing:border-box;-webkit-box-sizing:border-box;box-sizing:border-box;background:#fff;border-radius:5px;border:1px solid #dbdbdb;white-space:normal;padding:5px;display:inline-block;margin:8px 0}",
          "div.commentbox .md{border:1px solid #ddd;background:#f0f0f0;-moz-box-sizing:border-box;-webkit-box-sizing:border-box;box-sizing:border-box;margin:3px 0;box-sizing:border-box;padding:2px 8px}",
          ".loaderror:before{content:\" loading failed \";color:red} .loading:before{content:\"Loading...\"} .res-nightmode .loaderror:before{content:\" loading failed \";color:#E63A3A}",
          "div.commentbox .md *{white-space:normal} div.commentbox .md code{white-space:pre} div.commentbox .md pre{overflow:visible} div.commentbox>*{font-size:small}",
          "div.commentbox .ulink,div.commentbox .md a{font-weight:700;color:#369!important} .listing-page .buttons li{vertical-align:top} .toplink{color:#FF4500!important;text-decoration:none;margin-left:10px!important;}",
          ".permalink{float:right;color:#666;margin-left:.5em} .points{color:#333;font-weight:700;margin-left:.5em}",
          ".res-nightmode div.commentbox pre,.res-nightmode div.commentbox code,.res-nightmode .link .md pre{border:1px solid #222!important;background:#282828!important;background-color:#282828!important}",
          ".res-nightmode div.commentbox .ulink,.res-nightmode div.commentbox .md a{color:#1496dc!important} .res-nightmode div.commentbox{background:#333!important;border-color:#666!important}",
          ".res-nightmode div.commentbox .md{background:#555!important;border-color:#222!important} .res-nightmode .toplink{color:#eee!important}",
          ".res-nightmode div.commentbox .points{color:#ddd!important} .res-nightmode div.commentbox .permalink{color:#ccc!important}",
          ".res-nightmode div.commentbox .md blockquote, .res-nightmode div.commentbox .md del{color:#8C8C8C!important} .res-nightmode div.commentbox hr{border-color:#777!important};}",
          ".res-nightmode div.commentbox hr{border-color:#777!important;}"
        ].join(""),
        items_selector: "div.entry",
        menubar_element: "<li>",
        menubar_parent: $(".tabmenu"),
        expando_button: ".res-show-images a",
        comment_link: "a:contains(comments)"
      }
    },
    addStyle = function () {
      var style = $("<style>", {
        type: "text/css",
        html: design[design.active].style
      });
      $("head").append(style);
    },
    retrieveTopComments = function (toplink) {
      var id = $(toplink).attr("id").replace(new RegExp("^" + helper.prefix.id), ""),
        item = $("#" + helper.prefix.item + id),
        comment_box = $("#" + helper.prefix.box + id),
        url = "//" + document.domain + "/comments/" + id + "/.json";

      if (comment_box.length === 0) {
        comment_box = $("<div>", {
          "class": "commentbox loading",
          "id": helper.prefix.box + id
        });

        if (options.commentsAtTop) {
          if (design.active === "new") {
            if (helper.layout.active === "card") {
              item.children().last().children().first().next().after(comment_box);
            } else if (helper.layout.active === "classic") {
              item.children().last().children().first().after(comment_box);
            } else {
              item.first().children().first().after(comment_box);
            }
          } else {
            item.find(".top-matter").after(comment_box);
          }
        } else {
          item.append(comment_box);
        }
      }
      if (comment_box.hasClass("loading")) {
        $.get(url, {
            limit: options.topComments + 5, // + 5 in case we delete some pinned comments
            sort: options.commentSorting
          }, function (data) {
            var i, newHTML = "",
              comments_count = data[1].data.children.length,
              threadLink = data[0].data.children[0].data.permalink,
              comments_max = options.topComments < comments_count ? options.topComments : comments_count;
            if (comments_count === 0) {
              comment_box.remove();
            } else if (comment_box !== null && comment_box.hasClass("loading")) {
              comment_box.html("");
              for (i = 0; i < comments_max; i += 1) {
                if (options.skipCommentsFrom.indexOf(data[1].data.children[i].data.author) !== -1) {
                  comments_max += 1;
                } else {
                  newHTML += (newHTML === "" ? "" : "<hr>");

                  newHTML += $("<a>", {
                    class: "ulink",
                    target: "_blank",
                    href: "/u/" + data[1].data.children[i].data.author,
                    html: data[1].data.children[i].data.author
                  })[0].outerHTML;

                  newHTML += $("<span>", {
                    class: "points",
                    html: "| score: " + data[1].data.children[i].data.score
                  })[0].outerHTML;

                  newHTML += $("<a>", {
                    class: "permalink",
                    target: "_blank",
                    href: threadLink + data[1].data.children[i].data.id,
                    html: "permalink"
                  })[0].outerHTML;
                  newHTML += "<br />" + $($.parseHTML(data[1].data.children[i].data.body_html)).text();
                }
              }
              comment_box.removeClass("loading");
              comment_box.html(newHTML);
            }
          })
          .fail(function () {
            var retries = 0;
            if (comment_box.data("retries") !== undefined) {
              retries = parseInt(comment_box.data("retries"), 10);
            }
            comment_box.data("retries", retries + 1);
            if (retries > 5) {
              comment_box.removeClass("loading");
              comment_box.addClass("loaderror");
              comment_box.data("retries", 0);
            } else {
              setTimeout(retrieveTopComments(toplink), 2000);
            }
          }, "json");
      } else {
        comment_box.remove();
      }
    },
    addTopLinks = function (items) {
      var java = "java";
      if (items === undefined) {
        return;
      }
      items.each(function () {
        var id_index, comment_id, toplink,
          comment_link = $(this).find(design[design.active].comment_link);
        if (comment_link.length === 0) {
          console.log("No link found for following Item:");
          console.log(this);
          return;
        }
        id_index = comment_link.attr("href").indexOf("/comments/");
        comment_id = comment_link.attr("href").substring(id_index + 10).split("/")[0];
        $(this).attr("id", helper.prefix.item + comment_id);
        toplink = $("<a>", {
          "class": "toplink",
          "id": helper.prefix.id + comment_id,
          "href": java + "script:;",
          "html": options.commentSorting
        }).click(function () {
          retrieveTopComments(this);
        });
        comment_link.after(toplink);
        if (GM_getValue("autoLoadComments", false)) {
          retrieveTopComments(toplink);
        }
      });
    };
  $(function () {
    var sidebar, loadbar, spanImages, spanComments,
      sidebar_view = "hide",
      buttonStatus = "disabled";

    design.active = $(".scrollerItem").length > 0 ? "new" : "old";

    addStyle();

    if (design.active === "new") {
      helper.findLayout();
    }

    addTopLinks($(design[design.active].items_selector));

    // Menu button show/hide sidebar
    if (!options.disableSidebarButton && document.location.pathname.indexOf("/comments/") === -1) {
      if (design.active === "new") {
        $('div a[href="/submit"]').last().parent().parent().parent().addClass("side");
      }

      if (GM_getValue("sideBarToggle", true)) {
        sidebar_view = "show";
        helper.toggleView(".side");
      }

      sidebar = $(design[design.active].menubar_element, {
        html: $("<a>", {
          id: "sidebarswitch",
          html: sidebar_view + " sidebar"
        })
      }).click(function () {
        GM_setValue("sideBarToggle", !GM_getValue("sideBarToggle", true));
        sidebar_view = "hide";
        if (GM_getValue("sideBarToggle", true)) {
          sidebar_view = "show";
        }
        $(this).find("a").html(sidebar_view + " sidebar");
        helper.toggleView(".side");
      });

      design[design.active].menubar_parent.append(sidebar);
    } else {
      GM_setValue("sideBarToggle", false);
    }

    // Menu button auto-load media and comments
    if (!options.disableAutoloadButton && document.location.pathname.indexOf("/comments/") === -1) {
      loadbar = $(design[design.active].menubar_element, {
        class: "aubox topbar",
        html: $("<a>", {
          html: "show"
        })
      });
      if ($("#RESConsoleVersion").length > 0) {
        if (GM_getValue("autoExpandMedia", false)) {
          buttonStatus = "enabled";
        }
        spanImages = $("<span>", {
          html: $("<a>", {
            href: "#",
            class: buttonStatus,
            html: "media"
          })
        }).click(function () {
          GM_setValue("autoExpandMedia", !GM_getValue("autoExpandMedia", false));
          location.reload();
        });
        loadbar.append(spanImages);
      }

      buttonStatus = "disabled";
      if (GM_getValue("autoLoadComments", false)) {
        buttonStatus = "enabled";
      }
      spanComments = $("<span>", {
        html: $("<a>", {
          href: "#",
          class: buttonStatus,
          html: "comments"
        })
      }).click(function () {
        GM_setValue("autoLoadComments", !GM_getValue("autoLoadComments", false));
        location.reload();
      });

      loadbar.append(spanComments);
      design[design.active].menubar_parent.append(loadbar);
    } else if (options.disableAutoloadButton) {
      GM_setValue("autoExpandMedia", false);
      GM_setValue("autoLoadComments", false);
    }

    // Get style from other menu button for new design
    if (design.active === "new") {
      $("#view--layout--FUE").children().each(function () {
        if ($(this).text() === "View") {
          this.classList.forEach(function (cl) {
            if (!/.+-.+/.test(cl)) {
              loadbar.addClass(cl);
              sidebar.addClass(cl);
            }
          });
        }
      });
    }

    // Auto expand images etc
    if (GM_getValue("autoExpandMedia", false)) {
      if (design.active === "new") {
        $(design[design.active].expando_button).click();
      } else {
        document.querySelector(design[design.active].expando_button).click();
      }
    }

    // Listener for layout change
    if (design.active === "new") {
      $("[id^=" + helper.layout.prefix + "]").click(function () {
        setTimeout(function () {
          helper.findLayout();
          addTopLinks($(design[design.active].items_selector));
        }, 100);
      });
    }

    // Listener for newly added items
    $("body").change(function (changes) {
      $.each(changes, function (i, l) {
        var item = $(l.addedNodes).find(design[design.active].items_selector);
        if (item.length > 0) {
          addTopLinks(item);
        }
      });
    });

    // Listener for key 't' to toggle comments
    if (!options.disableShortCut && $("#RESConsoleVersion").length > 0) {
      $("window").keyup(function (e) {
        if (e.keyCode === 84 && $(".RES-keyNav-activeElement").length > 0) { //T: keycode 84
          $(".RES-keyNav-activeElement .toplink").click();
        }
      });
    }
  });

  // A minimal jQuery library for reacting to innerHTML changes - https://jsfiddle.net/ecmanaut/jRbEz
  $.fn.change = function (cb, e) {
    e = e || {
      subtree: true,
      childList: true,
      characterData: true
    };
    $(this).each(function () {
      var node = this;

      function callback(changes) {
        cb.call(node, changes, this);
      }
      (new MutationObserver(callback)).observe(node, e);
    });
  };
}(jQuery));