Add some libraries for utility and pretty output

collage.cabal

@@ -2,7 +2,10 @@ cabal-version: 2.2
 name: collage
 version: 0.1.0.0
 synopsis: A tool for assembling documents out of working, testable code
+description:
+  Collage is a tool for writing documents that include snippets of code
+  in such a way that the code can be build and examined independently
+  of the source document.
 license: BSD-3-Clause
 author: Getty Ritter <gettylefou@gmail.com>
 maintainer: Getty Ritter <gettylefou@gmail.com>
@@ -17,15 +20,18 @@ library
                  , Collage.Opts
                  , Collage.Commands.Test
                  , Collage.Commands.Splice
+                 , Collage.Utils
   build-depends: base >=4.7 && <5
                , adnot
                , bytestring
                , containers
                , directory
                , filepath
+               , formatting
                , optparse-applicative
                , process
                , text
+               , unix
                , vector
   hs-source-dirs: src
   ghc-options: -Wall