Markdown Divs with title to latex

[madsmh]

I have some theorems as markdown Divs, like

::: {theorem .title="Cayley-Hamilton"}
Let $M$ be finitely generated $R$-module and $\ideal{a}$ an ideal of $R$ 
and $\varphi: M\to M$ and $R$-module homomorphism. 
with $\im\varphi \subseteq \ideal{a}R$. Then there is a monic polynomial
$$
\chi = x^{n}+a_{n-1}x^{n-1}+\cdots +a_{0}=0\in R[x]
$$
with $a_{0},\dots,a_{n-1}\in \ideal{a}$ and
$$
\chi(\varphi)=0.
$$
where $\chi(\varphi)(-)\in \Hom_{R}(M,M)$.
:::

And I am trying to make a pandoc filter in python to convert this to a latex theorem environment with title, but I am at a loss how to access the title string with the pandocfilters python module.

[jgm]

You shouldn't have the . in front of title. That will cause this not to be parsed as a fenced Div at all. . is for classes.

[jgm]

Have a look at examples like
https://github.com/jgm/pandocfilters/blob/master/examples/ditaa.py

[madsmh]

I don't see anything relevant...I am not an experienced programmer.. :)

I have made this attempt

def LaTeX (x):
    return RawBlock('latex', x)

def theoremize(key, value, format, meta):
    if key == "Div":
        [[ident, classes, kvs], contents] = value
        if format == "latex":
            if ident == "":
                label = ""
            else:
                label = "\\label{" + ident + "}\n"
            if "title" in classes:
                title = get_filename4code("title", contents)
                return ([LaTeX("\\begin" + classes[0] + "[" + title + "]\n" + label + "\n")] + contents + [
                    LaTeX("\\end" + title + "\n")])
            else:
                return ([LaTeX("\\begin" + classes[0] + "\n" + label + "\n")] +
                        contents + [LaTeX("\\end" + classes[0] + "\n")])

[jgm]

I would recommend using Lua filters unless you already have strong reasons to use Python. We have good documentation with plenty of examples, and they are more powerful and faster.

[jgm]

It's also possible that someone has written a filter already that does what you need. See e.g.
https://github.com/dialoa/statement

[madsmh]

aret here any extensions I need to have loaded? Div's of the form
::: {theorem title="Cayley-Hamilton"}
does not seem to be recognized at all as a Div, only those like
::: {theorem}
or something in python other than pandocfilters?

[jgm]

::: {theorem title="Cayley-Hamilton"}

This is not a valid attribute in pandoc. do you mean .theorem instead of theorem?