What?

Here is proposed skeleton for new Yesod project.

What is wrong with current skeleton

Foundation has no access to site internals

Foundation contains instance Yesod App with method isAuthorized and other methods which often requires access to site internals.

All Haskell code in project root

Code should be placed in src or lib directory.

The proposal

Other project structure

App.FoundationImport  -- should be imported by `*.Handler` modules only
App.NoFoundationImport -- should be imported by any other module which must not be dependent from `App`
App.DB.* -- for models and working with database
App.Route.Home.Handler -- same as `Handler.Home` in old structure. This module depends on `Foundation` and have access to `Route App` (import App.FoundationImport)
App.Route.Home.Form -- for form types which is used in `App.Route.Home.Handler`. This module written in independent from `App` fassion (import App.NoFoundationImport)
App.Route.Home.Common -- some other code used in elsewhere in Form or Handler (import App.NoFoundationImport)
App.Common.* -- Some other common modules used anywhere in project. Should not depend on `App` and `import App.NoFoundation`
App.Handler -- Just reexports all handlers from `App.Route.{route path}.Handler` modules

Here is picture of module dependencies:

Minimize code in Handler

While all logic is moved to Helper namespace handlers become minimalistic. This is a consequence of preceeding paragraph.

Move all project code to src

No comments.

Beautify cabal file

Add separating coma to module lists, sort module lists, sort dependency lists, sort extensions list, normalize indenting, remove blank spaces.