Convert SlashCommandHelpDialog to TS

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

src/components/views/dialogs/SlashCommandHelpDialog.tsx

@@ -0,0 +1,68 @@
+/*
+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, Commands } from "../../../SlashCommands";
+import InfoDialog from "./InfoDialog";
+
+interface IProps {
+    onFinished: () => void;
+}
+
+const SlashCommandHelpDialog: React.FC<IProps> = ({ onFinished }) => {
+    const categories = {};
+    Commands.forEach(cmd => {
+        if (!cmd.isEnabled()) return;
+        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.getCommand() }</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} />;
+};
+
+export default SlashCommandHelpDialog;