TeX rendering handled using Julia - mostly in memory!

tex_prototype.jl

# Generate the tex file

rawtex = raw"""
\documentclass{standalone}
\begin{document}
\[\left[{\frac{-\hbar^{2}}{2m}}\nabla^{2}+V(\mathbf{r})\right]\Psi(\mathbf{r}) = E\Psi(\mathbf{r})\] % Schrodinger equation
\end{document}
"""

lua_stdin = IOBuffer(writable = true)

# compile to a temporary file

luatex = run(pipeline(`dvilualatex --jobname=temp`, stdin = lua_stdin))

write(lua_stdin, rawtex)

close(lua_stdin)

success(luatex) # wait for the compilation to finish

dvi = read("temp.dvi", String)

# Dvisvgm - convert the DVI to an SVG

dvisvgm_in = IOBuffer(; writable = true)

dvisvgm_out = IOBuffer(; writable = true)

dvisvgm = run(pipeline(`dvisvgm --stdin --stdout`, stdin = dvisvgm_in, stdout = dvisvgm_out))

write(dvisvgm_in, dvi)

close(dvisvgm_in)

success(dvisvgm)

svg = read(dvisvgm_out)

# We now have an in-memory SVG, waiting to be rendered by Rsvg.