Adding autocodeblocking (#15)

* autocodeblocking

* ast fix
better type annotations

* ci there you go

* line too long ==> remove comment

* deleting message + lowercase python

* comments

* remove docstrings

* you may

* not sure what you mean with move to a new line maybe this?

* descriptive enough?

* better explanation of text filtering

* rewrite

* fstring

* pep8

* better comment

* discord message length

* ok shady

* ok shady

* "This is still async discord.py"

* didnt see josephs comment

* minor comment changes

* blank and typo

* typo..

* embed sending

* adding waiting time + embed
dont know if this is the correct way to store the field string

* forgot await

* but now i know

* i heard him

* pls

* more descriptive variable name

* comment

* and better string formatting

* approve me lemon

* here we go aperture

* there we go again

* name error..... damn linter plugins

* you get it aperture

* ok lemon

* ok aperture

* constants instead of plain channel ID

* forgot one

* constants in bot.py

* lemons way ftw

* flake8 is weird man

* aperture 1

* next aperture

* dunno

* imports

* next lemon

2 files changed, 48 insertions, 2 deletions

diff --git a/bot/cogs/bot.py b/bot/cogs/bot.py
index 9351da472..9d8ee52aa 100644
--- a/bot/cogs/bot.py
+++ b/bot/cogs/bot.py
@@ -1,10 +1,14 @@
 # coding=utf-8
-from discord import Embed
+import ast
+import time
+
+from discord import Embed, Message
 from discord.ext.commands import AutoShardedBot, Context, command, group
 
 from dulwich.repo import Repo
 
-from bot.constants import PYTHON_GUILD, VERIFIED_ROLE
+from bot.constants import (HELP1_CHANNEL, HELP2_CHANNEL, HELP3_CHANNEL,
+                           PYTHON_CHANNEL, PYTHON_GUILD, VERIFIED_ROLE)
 from bot.decorators import with_role
 
 
@@ -16,6 +20,13 @@ class Bot:
     def __init__(self, bot: AutoShardedBot):
         self.bot = bot
 
+        # Stores allowed channels plus unix timestamp from last call
+        self.code_block_channels = {HELP1_CHANNEL: 0,
+                                    HELP2_CHANNEL: 0,
+                                    HELP3_CHANNEL: 0,
+                                    PYTHON_CHANNEL: 0
+        }  # noqa. E124
+
     @group(invoke_without_command=True, name="bot", hidden=True)
     @with_role(VERIFIED_ROLE)
     async def bot_group(self, ctx: Context):
@@ -60,6 +71,37 @@ class Bot:
 
         await ctx.invoke(self.info)
 
+    async def on_message(self, msg: Message):
+        if msg.channel.id in self.code_block_channels:
+            if self.code_block_channels[msg.channel.id]-time.time() > 300:
+                if msg.content.count("\n") >= 3:
+                    try:
+                        tree = ast.parse(msg.content)
+
+                        # Attempts to parse the message into an AST node.
+                        # Invalid Python code will raise a SyntaxError.
+                        if not all(isinstance(node, ast.Expr) for node in tree.body):
+
+                            # Multiple lines of single words could be interpreted as expressions.
+                            # This check is to avoid all nodes being parsed as expressions.
+                            # (e.g. words over multiple lines)
+                            howto = ("Please use syntax highlighted blocks, as it makes"
+                                     "your code more legible for other users.\n"
+                                     "\nTo do this, you should input your content like this:\n"
+                                     "\n\`\`\`python\n"
+                                     "print(\"Hello world!\")\n"
+                                     "\`\`\`\n"
+                                     "\nThis will result in the following:\n"
+                                     "```\n"
+                                     "print(\"Hello world!\")"
+                                     "```"
+                            )  # noqa. E124
+                            information = Embed(title="Code formatting", description=howto)
+                            await msg.channel.send(embed=information)
+                            self.code_block_channels[msg.channel.id] = time.time()
+                    except SyntaxError:
+                        pass
+
 
 def setup(bot):
     bot.add_cog(Bot(bot))
diff --git a/bot/constants.py b/bot/constants.py
index 582bca2fa..aa546b66b 100644
--- a/bot/constants.py
+++ b/bot/constants.py
@@ -5,6 +5,10 @@ import os
 PYTHON_GUILD = 267624335836053506
 
 BOT_CHANNEL = 267659945086812160
+HELP1_CHANNEL = 303906576991780866
+HELP2_CHANNEL = 303906556754395136
+HELP3_CHANNEL = 303906514266226689
+PYTHON_CHANNEL = 267624335836053506
 DEVLOG_CHANNEL = 409308876241108992
 VERIFICATION_CHANNEL = 352442727016693763