1 files changed, 102 insertions, 3 deletions
diff --git a/bot/utils/converters.py b/bot/utils/converters.py
index 228714c9..fe2c980c 100644
--- a/bot/utils/converters.py
+++ b/bot/utils/converters.py
@@ -1,11 +1,14 @@
+from datetime import datetime
+from typing import Tuple, Union
+
 import discord
-from discord.ext.commands.converter import MessageConverter
+from discord.ext import commands
 
 
-class WrappedMessageConverter(MessageConverter):
+class WrappedMessageConverter(commands.MessageConverter):
     """A converter that handles embed-suppressed links like <http://example.com>."""
 
-    async def convert(self, ctx: discord.ext.commands.Context, argument: str) -> discord.Message:
+    async def convert(self, ctx: commands.Context, argument: str) -> discord.Message:
         """Wrap the commands.MessageConverter to handle <> delimited message links."""
         # It's possible to wrap a message in [<>] as well, and it's supported because its easy
         if argument.startswith("[") and argument.endswith("]"):
@@ -14,3 +17,99 @@ class WrappedMessageConverter(MessageConverter):
             argument = argument[1:-1]
 
         return await super().convert(ctx, argument)
+
+
+class CoordinateConverter(commands.Converter):
+    """Converter for Coordinates."""
+
+    @staticmethod
+    async def convert(ctx: commands.Context, coordinate: str) -> Tuple[int, int]:
+        """Take in a coordinate string and turn it into an (x, y) tuple."""
+        if len(coordinate) not in (2, 3):
+            raise commands.BadArgument("Invalid co-ordinate provided.")
+
+        coordinate = coordinate.lower()
+        if coordinate[0].isalpha():
+            digit = coordinate[1:]
+            letter = coordinate[0]
+        else:
+            digit = coordinate[:-1]
+            letter = coordinate[-1]
+
+        if not digit.isdecimal():
+            raise commands.BadArgument
+
+        x = ord(letter) - ord("a")
+        y = int(digit) - 1
+
+        if (not 0 <= x <= 9) or (not 0 <= y <= 9):
+            raise commands.BadArgument
+        return x, y
+
+
+SourceType = Union[commands.Command, commands.Cog]
+
+
+class SourceConverter(commands.Converter):
+    """Convert an argument into a command or cog."""
+
+    @staticmethod
+    async def convert(ctx: commands.Context, argument: str) -> SourceType:
+        """Convert argument into source object."""
+        cog = ctx.bot.get_cog(argument)
+        if cog:
+            return cog
+
+        cmd = ctx.bot.get_command(argument)
+        if cmd:
+            return cmd
+
+        raise commands.BadArgument(
+            f"Unable to convert `{argument}` to valid command or Cog."
+        )
+
+
+class DateConverter(commands.Converter):
+    """Parse SOL or earth date (in format YYYY-MM-DD) into `int` or `datetime`. When invalid input, raise error."""
+
+    @staticmethod
+    async def convert(ctx: commands.Context, argument: str) -> Union[int, datetime]:
+        """Parse date (SOL or earth) into `datetime` or `int`. When invalid value, raise error."""
+        if argument.isdecimal():
+            return int(argument)
+        try:
+            date = datetime.strptime(argument, "%Y-%m-%d")
+        except ValueError:
+            raise commands.BadArgument(
+                f"Can't convert `{argument}` to `datetime` in format `YYYY-MM-DD` or `int` in SOL."
+            )
+        return date
+
+
+class Subreddit(commands.Converter):
+    """Forces a string to begin with "r/" and checks if it's a valid subreddit."""
+
+    @staticmethod
+    async def convert(ctx: commands.Context, sub: str) -> str:
+        """
+        Force sub to begin with "r/" and check if it's a valid subreddit.
+
+        If sub is a valid subreddit, return it prepended with "r/"
+        """
+        sub = sub.lower()
+
+        if not sub.startswith("r/"):
+            sub = f"r/{sub}"
+
+        resp = await ctx.bot.http_session.get(
+            "https://www.reddit.com/subreddits/search.json",
+            params={"q": sub}
+        )
+
+        json = await resp.json()
+        if not json["data"]["children"]:
+            raise commands.BadArgument(
+                f"The subreddit `{sub}` either doesn't exist, or it has no posts."
+            )
+
+        return sub