Another quick guide for Haskell Stack

When you have Main.hs with no stack project, how can you build and run it?

In old days, I used Hugs or GHCi just to load a single Haskell file without any fancy project configurations. Sometimes the Haskell file required me to install some extra libraries such as network. Then I had only to give Hugs or GHCi an option to inform it of a  path where the libraries reside. 

How can you do this with Haskell Stack? This is the topic of this article. I found out it is easy!

$ ls 

Main.hs

$ stack init

$ stack ghci --no-load

Prelude> :l Main

Main.hs:3:1: error:

          Could not find module 'Network.Socket'

...

Prelude>:q

$ stack install network

$ stack ghci --no-load

Prelude> l: Main

Ok, one module loaded.

*Main>

This is it!! Isn't it surprisingly simple? But why does nobody explain it to me? :)