Add command line parser

elna.cabal

@@ -19,6 +19,7 @@ common warnings
         base >=4.7 && <5,
         bytestring ^>= 0.12.1,
         megaparsec ^>= 9.6,
+        optparse-applicative ^>= 0.18.1,
         vector ^>= 0.13.1,
         text ^>= 2.0
     ghc-options: -Wall
@@ -34,7 +35,9 @@ common warnings
 library elna-internal
     import: warnings
     exposed-modules:
+        Language.Elna.Architecture.RiscV
         Language.Elna.AST
+        Language.Elna.CommandLine
         Language.Elna.CodeGenerator
         Language.Elna.Intermediate
         Language.Elna.Location
@@ -56,7 +59,8 @@ executable elna
     import: warnings
     main-is: Main.hs
     build-depends:
-        elna:elna-internal
+        elna:elna-internal,
+        filepath ^>= 1.5.3
     hs-source-dirs: src
 
 test-suite elna-test