fix parse and reply

bot.js

@@ -1,2 +0,0 @@
-import calc from "./calc";
-

bot.py

@@ -75,16 +75,18 @@ class BotClient(discord.Client):
         match message.content.split(" "):
             case ["%calc", *args]:
                 reply = await self._calculate(args)
-                await message.reply(content=reply)
+                if reply:
+                    await message.reply(content=reply.strip())
             case _:
                 _log.info(f"Unrecognised command {command}")
 
     async def _calculate(self, args: list[str]) -> str:
-        proc = sp.run(["node", "calc_main.js", "--"] + args)
+        proc = sp.run(
+            ["node", "calc_main.js", "--"] + args, stdout=sp.PIPE, stderr=sp.PIPE
+        )
         if proc.returncode != 0:
             _log.error(f"running calculator: {proc.stderr}")
-        msg = proc.stdout or ""
-        return msg.strip()
+        return proc.stdout
 
     def is_replay(self, message: discord.Message) -> bool:
         if re.match("https://replay.pokemonshowdown.com/dl-.*", message.content):

calc.js

@@ -55,7 +55,7 @@ function buildLexer() {
   });
   const vs = chev.createToken({
     name: "vs",
-    pattern: "vs.",
+    pattern: /vs\.?/,
   });
 
   const terrainEnter = chev.createToken({