[hakyll] Composability of Compilers

[c***@gmail.com]

Hello!
What is the right way to compose Compilers?
I see a Compiler is an instance of Monad, Alternative...

I have two Compilers:

pandocRmdCompilerWith :: ReaderOptions -> WriterOptions -> Compiler (Item
String)
pandocRmdCompilerWith ropt wopt = do
item <- getResourceBody
if isRmd item
...
else pandocCompilerWith ropt wopt


and

pandocCompilerDiagramsWith :: ReaderOptions -> WriterOptions -> Compiler
(Item String)
pandocCompilerDiagramsWith ropt wopt = pandocCompilerWithTransformM ropt
wopt diagramsTransformer


The first is for compiling R code inside markdown. It takes Rmd files and
transforms them into HTML. If it finds a normal .md file (or something
else) it just uses the regular pandoc compiler.
The second takes a markdown file containing "diagrams" code and outputs
HTML.
How should I go to combine them?

See:
https://github.com/cdupont/hakyll-diagrams
https://github.com/cdupont/hakyll-R

Thanks
Corentin