First version

.editorconfig

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+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+indent_style = space
+indent_size = 4
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false

.gitignore

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+# ignore modules pulled in from npm
+node_modules/
+
+# rc-apps package output
+dist/
+
+.DS_Store

PollApp.ts

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+import {
+    IConfigurationExtend, ILogger,
+} from '@rocket.chat/apps-ts-definition/accessors';
+import { App } from '@rocket.chat/apps-ts-definition/App';
+import { IAppInfo } from '@rocket.chat/apps-ts-definition/metadata';
+
+import { PollCommand } from './command';
+
+export class PollApp extends App {
+    constructor(info: IAppInfo, logger: ILogger) {
+        super(info, logger);
+    }
+
+    public async initialize(configuration: IConfigurationExtend): Promise<void> {
+        await configuration.slashCommands.provideSlashCommand(new PollCommand());
+    }
+}

app.json

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+{
+    "id": "c33fa1a6-68a7-491e-bf49-9d7b99671c48",
+    "version": "0.0.1",
+    "requiredApiVersion": "^0.9.13",
+    "iconFile": "icon.png",
+    "author": {
+        "name": "Diego Sampaio",
+        "homepage": "https://sampaio.site",
+        "support": "https://sampaio.site"
+    },
+    "name": "Poll",
+    "nameSlug": "poll",
+    "classFile": "PollApp.ts",
+    "description": "Simple Poll"
+}

command.ts

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+import { IHttp, IModify, IPersistence, IRead } from '@rocket.chat/apps-ts-definition/accessors';
+import { ISlashCommand, SlashCommandContext } from '@rocket.chat/apps-ts-definition/slashcommands';
+
+const emojis = [
+    ':zero:',
+    ':one:',
+    ':two:',
+    ':three:',
+    ':four:',
+    ':five:',
+    ':six:',
+    ':seven:',
+    ':eight:',
+    ':nine:',
+    ':keycap_ten:',
+];
+
+const clearQuotes = (item) => item.replace(/(^['"]|['"]$)/g, '');
+
+export class PollCommand implements ISlashCommand {
+    public command = 'poll';
+    public i18nParamsExample = 'params_example';
+    public i18nDescription = 'cmd_description';
+    public providesPreview = false;
+
+    public async executor(context: SlashCommandContext, read: IRead, modify: IModify, http: IHttp, persis: IPersistence): Promise<void> {
+        const params = context.getArguments().join(' ');
+        const match = params.match(/((["'])(?:(?=(\\?))\3.)*?\2)/g);
+
+        if (!match) {
+            throw new Error('Invalid params');
+        }
+
+        // let question;
+        // const options: Array<string> = [];
+
+        const options = match.map(clearQuotes);
+        const question = options.shift();
+
+        // match.forEach((item, i) => {
+        //     const clearItem = item.replace(/(^['"]|['"]$)/g, '');
+        //     if (i === 0) {
+        //       question = clearItem;
+        //     } else {
+        //       options.push(`${ emojis[(options.length + 1)] } ${ clearItem }`);
+        //     }
+        // });
+
+        const builder = modify.getCreator().startMessage()
+            .setSender(context.getSender())
+            .setRoom(context.getRoom())
+            .setAvatarUrl('https://user-images.githubusercontent.com/8591547/44113440-751b9ff8-9fde-11e8-9e8c-8a555e6e382b.png')
+            .setText('_Please vote using reactions_')
+            .setUsernameAlias('Poll');
+
+        try {
+            builder.addAttachment({
+                color: '#73a7ce',
+                title: {
+                    value: question,
+                },
+                text: options.map((option, index) => `${ emojis[index + 1] } ${ option }`).join('\n'),
+            });
+
+            await modify.getCreator().finish(builder);
+        } catch (e) {
+            // this.app.getLogger().error('Failed getting a gif', e);
+            builder.setText('An error occured when trying to send the gif :disappointed_relieved:');
+
+            modify.getNotifer().notifyUser(context.getSender(), builder.getMessage());
+        }
+    }
+}

i18n/en.json

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+{
+    "cmd_description": "Create a simple poll",
+    "params_example": "First parameter is the question, the next one are the poll options. Add them between quotes."
+}