render.py

#! /usr/bin/env python
import requests
import cairosvg
import click
from io import BytesIO
from PIL import Image as PILImage
from urllib.parse import quote
from pixcat import Image

def get_png(tex):
    url = "https://render.githubusercontent.com/render/math?math={0}".format(quote(tex))
    textimage = PILImage.open(BytesIO(cairosvg.svg2png(bytestring=requests.get(url).content)))
    background = PILImage.new('RGBA', textimage.size, (255,255,255))
    alpha_composite = PILImage.alpha_composite(background, textimage)
    return alpha_composite

@click.command()
@click.option("--tex", help="The LaTeX stuff you want to render")
def write_text(tex):
    png = get_png(tex)
    Image(png).fit_screen(enlarge=True, h_margin=10, v_margin=10).show()

# write_text(r"""\[\begin{bmatrix}A_x \\A_y\end{bmatrix}.\begin{bmatrix}B_x \\B_y\end{bmatrix}=(A_x)(B_x)+(A_y)(B_y)\]""")

if __name__ == "__main__":
    write_text()