Announcing *pandoc-select-code*: a pandoc filter to extract only the code 
blocks. You might use this, for example, to extract sample code from a 
tutorial. This package has been available from my repo for a while, but I 
have now uploaded it to Hackage, and also made it available as a Nix flake.

I originally developed this filter because I wanted something like literate 
Haskell, but using Markdown. I wanted to be able to write a Markdown file 
with Haskell code blocks, and then be able to compile and execute it, or 
use Pandoc to produce a PDF. Cabal doesn't support that, so one workaround 
is to pre-process the file using Pandoc with this filter and the 
--write=plain option to produce a source file that can be compiled.

I also use this when I'm updating a tutorial I wrote some time ago; I'll 
extract the code examples and verify that they still work with the latest 
software.

Hackage: https://hackage.haskell.org/package/pandoc-select-code
Repo: https://github.com/mhwombat/pandoc-select-code

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