Using Typst instead of LaTeX in Tex and TexText

[Varniex]

Motivation

Using Typst is cleaner, faster, more flexible and less complex than using standard $LaTeX$ (like MikTex) for equations. Besides the fact that Typst is similar to Markdown (with LaTeX like equation format), it doesn't need different compilers (and/or packages) for different fonts and other features.

Proposed changes

• Changed tex_mobject.py, tex_file_writing.py and tex_to_symbol_count.py to adapt Typst related equation strings
• Changed other related files (like special_tex.py) to accept Typst like equations.
• Changed respective code in example_scenes.py

Test

To test this version:

• Install Typst CLI for your device.

• Use Tex (or TexText) as before but with Typst style (like integral instead of \int).

• To set a different font, you can add these lines in the templates.yml or give as the additional_preamble parameter:

  1. TexText Font: #set text(font: <font_name>)
  2. Tex Font: #show math.equation: set text(font: <math_font_name>)

• Some things to apply to keep indexing correct:

  1. Use frac(num, denom) instead of num / denom
  2. Always apply superscript (^) before subscript (_). For eg: integral^infinity_0 e^(-x^2) d x

For e.g:

from manimlib import *


class EquationScene(Scene):
    def construct(self):
        equation = Tex("E = m c^2")
        self.add(equation)

        text = TexText("Hello, World!")
        self.add(text)

[jeremyong]

FYI it looks like the opening scene in this PR doesn't compile since rightarrow in the most recent Typst is spelled arrow or just -> but otherwise, this is working for me. Cool patch!