Split out SlashCommandHelpDialog, group by category and style it

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/views/dialogs/InfoDialog.js

@@ -20,10 +20,12 @@ import React from 'react';
 import PropTypes from 'prop-types';
 import sdk from '../../../index';
 import { _t } from '../../../languageHandler';
+import classNames from "classnames";
 
 export default React.createClass({
     displayName: 'InfoDialog',
     propTypes: {
+        className: PropTypes.string,
         title: PropTypes.string,
         description: PropTypes.node,
         button: PropTypes.string,
@@ -52,7 +54,7 @@ export default React.createClass({
                 contentId='mx_Dialog_content'
                 hasCancel={this.props.hasCloseButton}
             >
-                <div className="mx_Dialog_content" id="mx_Dialog_content">
+                <div className={classNames("mx_Dialog_content", this.props.className)} id="mx_Dialog_content">
                     { this.props.description }
                 </div>
                 <DialogButtons primaryButton={this.props.button || _t('OK')}

src/components/views/dialogs/SlashCommandHelpDialog.js

@@ -0,0 +1,63 @@
+/*
+Copyright 2019 Michael Telatynski <7t3chguy@gmail.com>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from 'react';
+import {_t} from "../../../languageHandler";
+import {CommandCategories, CommandMap} from "../../../SlashCommands";
+import sdk from "../../../index";
+
+export default ({onFinished}) => {
+    const InfoDialog = sdk.getComponent('dialogs.InfoDialog');
+
+    const categories = {};
+    Object.values(CommandMap).forEach(cmd => {
+        if (!categories[cmd.category]) {
+            categories[cmd.category] = [];
+        }
+        categories[cmd.category].push(cmd);
+    });
+
+    const body = Object.values(CommandCategories).filter(c => categories[c]).map((category) => {
+        const rows = [
+            <tr key={"_category_" + category} className="mx_SlashCommandHelpDialog_headerRow">
+                <td colSpan={3}>
+                    <h2>{_t(category)}</h2>
+                </td>
+            </tr>,
+        ];
+
+        categories[category].forEach(cmd => {
+            rows.push(<tr key={cmd.command}>
+                <td><strong>{cmd.command}</strong></td>
+                <td>{cmd.args}</td>
+                <td>{cmd.description}</td>
+            </tr>);
+        });
+
+        return rows;
+    });
+
+    return <InfoDialog
+        className="mx_SlashCommandHelpDialog"
+        title={_t("Command Help")}
+        description={<table>
+            <tbody>
+                {body}
+            </tbody>
+        </table>}
+        hasCloseButton={true}
+        onFinished={onFinished} />;
+};