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Where should the main module be stored in the Haskell idiomatic project?

According to the wikipedia page for the Haskell project structure , srcthe haskell idiomatic project folder is as follows:

src/           -- For keeping the sourcecode
    Main.lhs     -- The main-module
    App/         -- Use hierarchical modules
      ...
      Win32/     -- For system dependent stuff
      Unix/
    cbits/       -- For C code to be linked to the haskell program

Questions:

  • I assume that Main.lhsis the main entry point to the program. By this, I mean that it includes a method mainthat returns a type value IO (a)for some type a. This case?

  • What is the point of expanding .lhson Main.lhs? Why not name him Main.hs?

  • I reviewed some of the other popular Haskell projects on GitHub, and they don't seem to be closely monitoring this structure. Is this really an idiomatic way to organize a Haskell project?

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 src/
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 • README.md

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 • README.md

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