feat: allow using different prefixes to trigger commands (#233)

deps.ts

@@ -1,6 +1,11 @@
 // Internal dependencies
 export { config } from "https://deno.land/[email protected]/dotenv/mod.ts";
-export { cleanEnv, num, str } from "https://deno.land/x/[email protected]/mod.ts";
+export {
+  cleanEnv,
+  makeValidator,
+  num,
+  str,
+} from "https://deno.land/x/[email protected]/mod.ts";
 export {
   dirname,
   fromFileUrl,

env.ts

@@ -1,9 +1,34 @@
-import { cleanEnv, config, num, str } from "./deps.ts";
+import { cleanEnv, config, makeValidator, num, str } from "./deps.ts";
 
 await config({ export: true });
 
+// https://stackoverflow.com/a/54256858/12250600
+const PREFIX_REGEX = /^[^\p{L}\d\s@#\$]$/u;
+
+const cmdPrefix = makeValidator((input) => {
+  if (PREFIX_REGEX.test(input)) {
+    return input;
+  }
+  console.warn(
+    "Falling back to '\\' for COMMAND_PREFIX, a single symbol excluding @, #, $ was expected",
+  );
+  return "\\";
+});
+
+const inputPrefix = makeValidator((input) => {
+  if (PREFIX_REGEX.test(input) && input !== Deno.env.get("COMMAND_PREFIX")) {
+    return input;
+  }
+  console.warn(
+    "Falling back to '>' for INPUT_PREFIX, a single symbol excluding @, #, $ and COMMAND_PREFIX was expected",
+  );
+  return "\\";
+});
+
 export default cleanEnv(Deno.env.toObject(), {
   STRING_SESSION: str(),
   APP_ID: num(),
   APP_HASH: str(),
+  COMMAND_PREFIX: cmdPrefix({ default: "\\" }),
+  INPUT_PREFIX: inputPrefix({ default: ">" }),
 });

handlers/command_handler.ts

@@ -1,5 +1,6 @@
 import { HandlerFuncParams } from "./handler.ts";
 import { MessageHandler } from "./message_handler.ts";
+import env from "../env.ts";
 
 export interface CommandHandlerFuncParams {
   args: string[];
@@ -37,7 +38,7 @@ export class CommandHandler extends MessageHandler<CommandHandlerFuncParams> {
       return false;
     }
     const { text } = event.message;
-    if (!["\\", ">"].includes(text[0])) {
+    if (![env.COMMAND_PREFIX, env.INPUT_PREFIX].includes(text[0])) {
       return false;
     }
     const command = text.split(/\s/)[0].slice(1);
@@ -54,14 +55,14 @@ export class CommandHandler extends MessageHandler<CommandHandlerFuncParams> {
     const inputType = message[0];
     const reply = await event.message.getReplyMessage();
     switch (inputType) {
-      case "\\":
+      case env.COMMAND_PREFIX:
         input = (this.opts?.rawInput ? message : text)
           .split("\n")
           .slice(1)
           .join("\n")
           .trim();
         break;
-      case ">":
+      case env.INPUT_PREFIX:
         if (reply && reply.text) {
           input = this.opts?.rawInput ? reply.message : reply.text;
         }