qrm2/exts/tex.py

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"""
TeX extension for qrm
---
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Copyright (C) 2021 classabbyamp, 0x5c
This file is part of qrm2 and is released under the terms of
the GNU General Public License, version 2.
"""
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import aiohttp
from io import BytesIO
from urllib.parse import urljoin
import discord
import discord.ext.commands as commands
import common as cmn
import data.options as opt
class TexCog(commands.Cog):
def __init__(self, bot: commands.Bot):
self.bot = bot
self.session = aiohttp.ClientSession(connector=bot.qrm.connector)
with open(cmn.paths.resources / "template.1.tex") as latex_template:
self.template = latex_template.read()
@commands.command(name="tex", aliases=["latex"], category=cmn.Cats.UTILS)
async def tex(self, ctx: commands.Context, *, expr: str):
"""Renders a LaTeX expression.
In paragraph mode by default. To render math, add `$` around math expressions.
"""
payload = {
"format": "png",
"code": self.template.replace("#CONTENT#", expr),
"quality": 50
}
with ctx.typing():
# ask rTeX to render our expression
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async with self.session.post(urljoin(opt.rtex_instance, "api/v2"), json=payload) as r:
if r.status != 200:
raise cmn.BotHTTPError(r)
render_result = await r.json()
if render_result["status"] != "success":
embed = cmn.embed_factory(ctx)
embed.title = "LaTeX Rendering Failed!"
embed.description = ("Here are some common reasons:\n"
"• Did you forget to use math mode? Surround math expressions with `$`,"
" like `$x^3$`.\n"
"• Are you using a command from a package? It might not be available.\n"
"• Are you including the document headers? We already did that for you.")
embed.colour = cmn.colours.bad
await ctx.send(embed=embed)
return
# if rendering went well, download the file given in the response
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async with self.session.get(urljoin(opt.rtex_instance, "api/v2/" + render_result["filename"])) as r:
png_buffer = BytesIO(await r.read())
embed = cmn.embed_factory(ctx)
embed.title = "LaTeX Expression"
embed.description = "Rendered by [rTeX](https://rtex.probablyaweb.site/)."
embed.set_image(url="attachment://tex.png")
await ctx.send(file=discord.File(png_buffer, "tex.png"), embed=embed)
def setup(bot: commands.Bot):
bot.add_cog(TexCog(bot))