I needed a preprocessor that could navigate into markdown/latex \include instruction and would concatenate all of them in a single document, that would be then, generated to latex/pdf using pandoc.

At the time, I only have one preprocessor routine, that is the \include command in latex.

python preprocessor.py "path_to_origin_file" ["path_to_destination_file"]

Imagine that you have the following markdown file, called index.md:

Title
=====

Some text here

\include{chapter01.md}

\include{chapter02.md}

And, chapter01.md:

Chapter 01
==========

Here's the lovely story of the snow-white.

And, chapter02.md:

Chapter 02
==========

Here's the chapter 2.

If you use the preprocessor, like this:

python preprocessor.py home/your_user/book/index.md

The preprocessor will produce the following file, named acumulado.md:

Title
=====

Some text here

Chapter 01
==========

Here's the lovely story of the snow-white.

Chapter 02
==========

Here's the chapter 2.