Added calc module with regards to #88

lib/db.js

@@ -60,6 +60,12 @@ const data = {
         MESSAGE_NOT_TAGGED: "```Tag a message or enter a number to proceed.```",
         NOT_BLOCK_BOT: "```Bot can not block itself```"
     },
+    calc: {
+        DESCRIPTION: "Calculates the given mathematical expression.",
+        EXTENDED_DESCRIPTION:
+            "```This module can be used to calculate a mathematical expression.\n\nExample usage,```\n*.calc 2+2*",
+        INVALID_FORMAT: "*Invalid format.*\nApproved Syntax:\n```1. 1 + 2``` \n```2. (1*2) + 2``` \n```3. 4! + 2^2```"
+    },
     carbon: {
         DESCRIPTION: "Convert text/code to a carbon image.",
         EXTENDED_DESCRIPTION: "```This module can be used to convert text/code into carbon images.\n\nExample Usage,```\n    *.carbon <text>* \n    *.carbon*  ```and reply to a text message.\n\nUse the -t flag after```  *.carbon*  ```to get the list of themes availble.\nIn order to specify the theme, use```  *.carbon <text> -t <theme>* .",

modules/calc.js

@@ -0,0 +1,30 @@
+const { MessageType } = require("@adiwajshing/baileys");
+const Strings = require("../lib/db");
+const format = require("python-format-js");
+const inputSanitization = require("../sidekick/input-sanitization");
+const calc = Strings.calc;
+const math = require("mathjs");
+
+module.exports = {
+    name: "calc",
+    description: calc.DESCRIPTION,
+    extendedDescription: calc.EXTENDED_DESCRIPTION,
+    demo: { isEnabled: true, text: ".calc 2^4+5!" },
+    async handle(client, chat, BotsApp, args) {
+        let output = math.evaluate(args[0]);
+        if(!isNaN(output)) {
+            await client
+            .sendMessage(BotsApp.chatId, calc.INVALID_FORMAT, MessageType.text);
+            return;
+        }
+        try {
+            client.sendMessage(
+                BotsApp.chatId,
+                `${args[0]} = ${output}`,
+                MessageType.text
+            ).catch(err => inputSanitization.handleError(err, client, BotsApp));
+        } catch (err) {
+            await inputSanitization.handleError(err, client, BotsApp);
+        }
+    },
+};

package.json

@@ -21,6 +21,7 @@
         "google-tts-api": "^2.0.2",
         "got": "^11.8.2",
         "jsdom": "^17.0.0",
+        "mathjs": "^10.1.0",
         "ocr-space-api-wrapper": "^1.0.6",
         "pg": "^8.7.1",
         "python-format-js": "^1.3.9",