rewrite: Restructure to include GUI.

src/meta/sharding.py

@@ -0,0 +1,35 @@
+from .args import args
+from .config import conf
+
+from psycopg import sql
+from data.conditions import Condition, Joiner
+
+
+shard_number = args.shard or 0
+
+shard_count = conf.bot.getint('shard_count', 1)
+
+sharded = (shard_count > 0)
+
+
+def SHARDID(shard_id: int, guild_column: str = 'guildid', shard_count: int = shard_count) -> Condition:
+    """
+    Condition constructor for filtering by shard id.
+
+    Example Usage
+    -------------
+    Query.where(_shard_condition('guildid', 10, 1))
+    """
+    return Condition(
+        sql.SQL("({guildid} >> 22) %% {shard_count}").format(
+            guildid=sql.Identifier(guild_column),
+            shard_count=sql.Literal(shard_count)
+        ),
+        Joiner.EQUALS,
+        sql.Placeholder(),
+        (shard_id,)
+    )
+
+
+# Pre-built Condition for filtering by current shard.
+THIS_SHARD = SHARDID(shard_number)