add command decorator

irandeno · Jun 1, 2021 · 35adfa0 · 35adfa0
1 parent aa1117e
commit 35adfa0
Showing 1 changed file with 16 additions and 0 deletions.
diff --git a/packages/common/decorators/telegram/listeners/command.decorator.ts b/packages/common/decorators/telegram/listeners/command.decorator.ts
@@ -0,0 +1,16 @@
+import { COMMAND_METADATA } from "../../../constants.ts";
+import { parse } from "../../../../deps.ts";
+export function Command(pattern: string): MethodDecorator {
+  return (
+    target: object,
+    key: string | symbol,
+    descriptor: PropertyDescriptor,
+  ) => {
+    pattern = validatePattern(pattern);
+    const trigger = parse(pattern);
+    Reflect.defineMetadata(COMMAND_METADATA, trigger, descriptor.value);
+  };
+}
+
+const validatePattern = (pattern: string) =>
+  pattern.length ? (pattern[0] === "/" ? pattern.slice(1) : pattern) : pattern;