feat: eval command (#23)

src/commands/Owner/Eval.ts

@@ -0,0 +1,40 @@
+import { Command } from '../../lib/structures/Command';
+import { MoonlightClient } from '../../lib/Client';
+import { BasePool } from '../../lib/structures/Pools/Base/BasePool';
+import { Stopwatch } from '../../lib/util';
+import { inspect } from 'util';
+import { Message } from 'discord.js';
+
+/** @ignore */
+export default class extends Command {
+    constructor(client: MoonlightClient, pool: BasePool<string, Command>) {
+        super(client, pool, {
+            ownerOnly: true,
+            usage: '<toEval:string>',
+            description: "Evaluates JavaScript. You can use the --async flag to be able to use await inside the command (be sure to have a return statement!) or the --inspect=number (number being the depth of the inspection) flag to display more things inside an object!"
+        });
+
+        this.customizeResponse('toEval', 'Please provide a string to eval!');
+    }
+
+    public async run(message: Message, args: EvalCommandArgs) {
+        const stopwatch = new Stopwatch();
+
+        let evaled: string;
+        if (this.flags.has('async')) evaled = await eval(`(async () => {${args.toEval}})()`);
+        else evaled = eval(args.toEval);
+
+        stopwatch.stop();
+
+        if (this.flags.has('inspect')) evaled = inspect(evaled, undefined, Number(this.flags.get('inspect')) || undefined);
+
+        evaled = String(evaled);
+        if (!evaled.length) return message.channel.send(`The eval didn't return any value!\nTook: ${stopwatch.getElapsedHuman}`);
+        if (evaled.length >= 1940) return message.channel.send(`Output too long... attached the output in a file!\nTook: ${stopwatch.getElapsedHuman}`, { files: [{ name: 'output.txt', attachment: Buffer.from(evaled) }] });
+        return message.channel.send(`\`\`\`js\n${evaled}\`\`\`\nTook: ${stopwatch.getElapsedHuman}`)
+    }
+}
+
+interface EvalCommandArgs {
+    toEval: string;
+}