User script for the Discord web client that makes all embeds collapsible.

00-README.md

testing adding a readme

discord-collapse.user.js

// ==UserScript==
// @name         Discord Collapsible Embeds
// @namespace    maltera.net
// @version      1.0
// @downloadURL  https://gist.githubusercontent.com/Elemecca/8e5f7746ca19d199ae2158d59afcc941/raw/discord-collapse.user.js
// @description  Makes all embeds collapsible in the Discord web client.
// @author       Sam Hanes <sam@maltera.com>
// @match        https://discordapp.com/channels/*
// @run-at       document-start
// @grant        none
// ==/UserScript==

(function() {
  "use strict";

  const elementKey = Symbol.for("react.element");
  const fragmentKey = Symbol.for("react.fragment");
  const arrowUp = "data:image/png;base64,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";
  const arrowDown = "data:image/png;base64,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  let React;


  /** Walks an element tree calling a visitor function for each element.
   * The tree will be walked depth-first. If the visitor returns a truthy
   * value walking will stop and that value will be returned immediately.
   *
   * @param element the root of the element tree to walk
   * @param visitor a function that will be called with each element
   * @return the first truthy value returned by the visitor
   */
  function visitElements(element, visitor) {
    let result;
    if (_.isArray(element)) {
      for (let value of element) {
        if ((result = visitElements(value, visitor))) return result;
      }
    } else if (_.isObject(element) && elementKey === element.$$typeof) {
      if ((result = visitor(element))) {
        return result;
      } else if (element.props && element.props.children) {
        return visitElements(element.props.children, visitor);
      }
    }
    return null;
  }


  function patchMessage(Message) {
    console.info("monkey-patching Message", {Message});
    const P = Message.prototype;

    const render = P.render;
    P.render = function() {
      const result = render.apply(this, arguments);
      const msg = this.props.message;
      if (msg.embeds.length === 0 && msg.attachments.length === 0) return result;

      visitElements(result, (elem) => {
        if ("message-text" === elem.props.className) {
          const show = this.props.renderEmbeds;
          elem.props.children.splice(0, 0, (
            React.createElement(
              "div",
              { className: "btn-option",
                style: {
                  color: 'black',
                  backgroundImage: "url(" + (show ? arrowUp : arrowDown) + ")",
                  visibility: (show ? undefined : "visible"),
                },
                onClick: this.props.xxToggleEmbed,
              },
              []
            )
          ));
        }
      });

      return result;
    };
  }


  function patchMessageGroup(MessageGroup) {
    console.info("monkey-patching MessageGroup", {MessageGroup});
    const P = MessageGroup.prototype;

    if (!MessageGroup.displayName) {
      MessageGroup.displayName = "MessageGroup";
    }


    // updates the show state to include new messages in the props
    function updateShowStateForProps(props) {
      const oldShowState = this.state.xxShowEmbeds || {};
      const newShowState = {};
      for (let msg of props.messages) {
        newShowState[msg.id] =
          (_.isNil(oldShowState[msg.id]) ? true : oldShowState[msg.id]);
      }

      if (!_.isEqual(oldShowState, newShowState)) {
        this.setState(() => ({
          xxShowEmbeds: newShowState,
        }));
      }
    }

    const componentWillMount = P.componentWillMount;
    P.componentWillMount = function() {
      if (componentWillMount) {
        componentWillMount.apply(this, arguments);
      }

      updateShowStateForProps.call(this, this.props);
    };

    const componentWillReceiveProps = P.componentWillReceiveProps;
    P.componentWillReceiveProps = function (nextProps) {
      if (componentWillReceiveProps) {
        componentWillReceiveProps.apply(this, arguments);
      }

      updateShowStateForProps.call(this, nextProps);
    };


    // overrides the messages' `renderEmbed` prop based on state
    const render = P.render;
    function renderMain() {
      const result = render.apply(this, arguments);

      visitElements(result, (elem) => {
        if (_.isFunction(elem.type) && "Message" === elem.type.displayName) {
          const id = elem.props.message.id;
          if (!this.state.xxShowEmbeds[id]) {
            elem.props.renderEmbeds = false;
            elem.props.inlineAttachmentMedia = false;
          }
          elem.props.xxToggleEmbed = () => {
            this.setState((prevState) => {
              const showState = _.clone(prevState.xxShowEmbeds);
              showState[id] = !showState[id];
              return {xxShowEmbeds: showState};
            });
          };
        }
      });

      return result;
    }

    // Message isn't exported, so we catch it the first time
    // it's returned from a MessageGroup and patch it at that point
    // this runs once and replaces itself once Message is found
    P.render = function() {
      const result = render.apply(this, arguments);

      const Message = visitElements(result, (cand) => (
        _.isFunction(cand.type) && "Message" === cand.type.displayName && cand.type
      ));
      if (Message) {
        patchMessage(Message);
        P.render = renderMain;
      }

      // just re-run `render`, it's idempotent
      return renderMain.apply(this, arguments);
    };
  }


  /** Called when Webpack loads a module.
   * @param module the exports of the module being loaded
   */
  function onModuleLoaded(module) {
    if (!React && fragmentKey == module.Fragment) {
      React = module;
      return;
    }

    if ("function" === typeof module) {
      if (module.defaultProps) {
        const defs = module.defaultProps;
        if ("undefined" !== typeof defs.renderEmbedsSmall) {
          patchMessageGroup(module);
        }
      }
    }
  }


  // this hijacks the Webpack module loading machinery
  // and calls `onModuleLoaded` for each module as it loads
  let webpackJsonp;
  Object.defineProperty(window, "webpackJsonp", {
    enumerable: true,
    get: function() {
      return webpackJsonp;
    },
    set: function(value) {
      const wrapMod = (func) => function(module, internal, require) {
        func.apply(this, arguments);
        if (module.exports) {
          onModuleLoaded(module.exports);
        }
      };
      webpackJsonp = function(a, mods, c) {
        if ("function" === typeof mods.map) {
          mods = mods.map(wrapMod);
        } else if ("object" === typeof mods) {
          for (let [key, value] of Object.entries(mods)) {
            mods[key] = wrapMod(value);
          }
        }
        return value.call(this, a, mods, c);
      };
    },
  });
})();