add check_aliases command

e621.py

@@ -178,3 +178,7 @@ class E621:
         if 'success' in r:
             return []
         return [E621PostVersion.from_dict(p) for p in r]
+
+    async def get_tag_aliases(self, name: str) -> List[str]:
+        r = (await self.client.get('/tag_aliases.json', params={'search[antecedent_name]': name})).json()
+        return [alias['consequent_name'] for alias in r]

main.py

@@ -297,6 +297,27 @@ async def list_tags(msg: Message):
     await msg.reply(f'Monitored tags:\n\n{lines}')
 
 
+@dp.message(filters.Command('check_aliases'), ChatFilter)
+async def check_aliases(msg: Message):
+    tags = [t.decode() for t in await redis.smembers(REDIS_SUBS_KEY)]
+    tags.sort()
+    progress = 0
+    lines = []
+
+    resp = await msg.reply('tmp')
+
+    async def send_progress():
+        await resp.edit_text(f'Checking aliases {progress}/{len(tags)}\n\n'
+                             f'{"\n".join(lines)}', parse_mode=ParseMode.HTML)
+
+    for sub in tags:
+        for subtag in sub.split():
+            if replacements := await e621.get_tag_aliases(subtag):
+                lines.append(f'- {subtag} -> {replacements[0]}, (<code>{sub}</code>)')
+        progress += 1
+        await send_progress()
+
+
 @dp.message(filters.Command('update'), ChatFilter)
 async def update(msg: Message):
     await check_updates()