[Haskell-beginners] hierarchy of modules

[Stephen Tetley]

Hello Mike


An option I like is to put the main project files in a top level
directory called src, so your organization would look like this:

./src/Algo/Fux.hs
./src/Basics/CSound.hs
./src/Basics/Node.hs

I usually have a running example which has imports for all the files
in the project inside a top level folder called demo...

./demo/ImportAll.hs

For a GHCi session, I cd to $PROJECT/demo then

> ghci

Prelude> set -i../src

This is the useful bit of having all the project files under the src
hierarchy - the search path is very simple.

During development adding the files needed for cabal (Setup.hs,
project.cabal...) is still worthwhile - you can then generate
Haddock docs very easily. If you used Haddock in standalone mode you
would have to supply a few flags to tell which files to
document and where to put the output.

Each time you add or remove a module in the src tree, you should
re-run configure...

> runhaskell Setup.hs configure
> runhaskell Setup.hs haddock

but as your GHCi session is always using the interpreted project
source you don't need to run 'runhaskell Setup.hs build' and
'runhaskell Setup.hs install'.

Best wishes

Stephen