Use compile LaTeX to HTML with subfiles

Question

I've got a rather large tex project I'd like to turn into one or many linked html files. However neither of my go-to converters, pandoc and latex2html, seem to support recursive compilation.

Is there a compiler flag for one of them that I'm missing? If not, is there a converter that supports what I'm trying to do, or do I just have to copy and paste everything into one absurdly long document?

EDIT:

To be clear, I have a file main.tex with the subfiles package. I have several other files, i.tex etc, of the form:

\documentclass[/path/to/files]{subfiles}
\begin{document}
Some words
\end{document}

How do I include all of them in my final document, either as content in some main.html or separate i.html files linked in to main.html, without doing the hard work by hand?

Answer 1

tex4ht support this. Simple example.

Main file sample.tex:

\documentclass{article}

\usepackage{subfiles}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\begin{document}
\title{Subfile example}
\maketitle
\tableofcontents
\subfile{subfile1.tex}
\end{document}

Included file subfile1.tex:

\documentclass[sample.tex]{subfiles}
\begin{document}
\section{Hello world}
Some words

Příliš žluťoučký kůň
\end{document}

You can compile the document using command

make4ht -u sample.tex

And this is the result:

Answer 2

Does latexml do what you want? I'm a little unsure of your exact needs but it can take a large LaTeX file and split it up by chapter or section (etc) into multiple HTML files.

I'm no expert but the command I'm using to do this (assuming document tex/mydocument.tex and saving to an html/ directory) is:

latexml tex/mydocument.tex | latexmlpost - \
  --sourcedirectory=tex \
  --format=html5 \
  --destination=html/mydocument.html \
  --splitat=chapter \
  --splitnaming=label

Here the split is by chapter, and each chapter needs a \label for the split naming to work. If you remove --splitnaming=label, it will simply call each HTML file something like Ch1.html..ChN.html.

It's not included in TeX Live but I had no problem on macOS installing directly from the LaTeXML Github repository.