Add executable section to cabal file (manually for now)

cabalize.cabal

@@ -8,6 +8,7 @@ library
   hs-source-dirs: src
   exposed-modules:
       Cabalize
+  other-modules:
       Config
       Util
   build-depends:
@@ -18,3 +19,11 @@ library
     , interpolate
     , yaml
   default-language: Haskell2010
+
+executable cabalize
+  hs-source-dirs: driver
+  main-is: Main.hs
+  build-depends:
+      base == 4.*
+    , cabalize
+  default-language: Haskell2010

driver/Main.hs

@@ -0,0 +1,6 @@
+module Main (main) where
+
+import           Cabalize
+
+main :: IO ()
+main = cabalize >>= uncurry writeFile

test/CabalizeSpec.hs

@@ -0,0 +1,38 @@
+{-# LANGUAGE QuasiQuotes #-}
+module CabalizeSpec (main, spec) where
+
+import           Test.Hspec
+import           Data.String.Interpolate
+import           Data.String.Interpolate.Util
+
+import           Cabalize
+
+main :: IO ()
+main = hspec spec
+
+spec :: Spec
+spec = do
+  describe "cabalize" $ do
+    it "creates cabal file" $ do
+      cabalize `shouldReturn` ("cabalize.cabal", unindent [i|
+      -- This file has been generated from .package.yaml by Cabalize.
+      name: cabalize
+      version: 0.0.0
+      build-type: Simple
+      cabal-version: >= 1.10
+
+      library
+        hs-source-dirs: src
+        exposed-modules:
+            Cabalize
+            Config
+            Util
+        build-depends:
+            base == 4.*
+          , base-compat
+          , directory
+          , filepath
+          , interpolate
+          , yaml
+        default-language: Haskell2010
+      |])

test/Spec.hs

@@ -0,0 +1 @@
+{-# OPTIONS_GHC -F -pgmF hspec-discover #-}