Instructing fpm not to include a folder

[ivan-pi]

Is their currently a method to prevent fpm from searching a folder in the source directory? I would like to archive some legacy routines in the src/legacy/ folder, but don't want them to be part of the output library.

.
├── fpm.toml
├── LICENSE
├── README.md
└── src
    ├── legacy
    │   ├── back.f
    │   ├── lu.f
    │   └── stiff3.f
    ├── linalg.f90
    ├── robertson.f90
    ├── stiff3_solver.f90
    └── vanpol.f90

Would it be better practice to move the legacy folder out of src?

[awvwgk]

I found myself using the below directory layout for fpm quite a lot (mainly due to the initial Haskell fpm constraint of the module namespaces)

.
├── fpm.toml
└── src
    ├── <name>
    │   └── ...
    └── <name>.f90

The toplevel <name>.f90 is usually just the public API reexport and the actual source is in <name> (example).
Without the toplevel module (maybe moving it to src/<name>/<name>.f90) one could change the library subdirectory to

[library]
source-dir = "src/<name>"

and fpm would ignore other subdirectories in src/.