Add syntax highlighting

This commit also cleans up the printing code, which is now longer but
easier to work with.

package.yaml

@@ -20,10 +20,11 @@ description:         Please see the README on GitHub at <https://github.com/Garm
 
 dependencies:
 - base                 >= 4.7    && < 5
+- ansi-terminal        >= 0.9.1  && < 0.10
 - bytestring           >= 0.10.8 && < 0.11
 - containers           >= 0.6.0  && < 0.7
-- text                 >= 1.2.3  && < 1.3
 - optparse-applicative >= 0.14.3 && < 0.15
+- text                 >= 1.2.3  && < 1.3
 
 library:
   source-dirs: src