setup build system properly

Setup.hs

@@ -0,0 +1,17 @@
+import Distribution.Simple
+import System.Process
+import System.Environment
+import System.Directory
+
+libdir :: String
+libdir = "src"
+
+main :: IO ()
+main = do
+  (a:_) <- getArgs
+  if a == "build"
+     then do
+       callProcess "bnfc" ["-d", "--text-token", "--functor", "hm.cf"]
+       renameDirectory "Hm" (libdir <> "/Hm")
+     else pure ()
+  defaultMain

hm.cabal

@@ -7,20 +7,34 @@ homepage:            https://githug.xyz/depsterr/hm
 -- bug-reports:
 license:             ISC
 license-file:        LICENSE
+build-type:          Custom
 author:              depsterr
 maintainer:          depsterr@protonmail.com
 -- copyright:
 category:            Programming Language
 
+custom-setup
+  setup-depends: base >= 4
+               , Cabal >= 2.4
+               , process >= 1
+               , directory >= 1
+
 library
   ghc-options:         -Werror=incomplete-patterns -Wall -fno-warn-name-shadowing
-                     , Simple.CC
+  exposed-modules:     Hm.Abs
+                     , Hm.Layout
+                     , Hm.Lex
+                     , Hm.Par
+                     , Hm.Print
+
+  other-modules:       Hm.ErrM
   build-tool-depends:  alex:alex >= 3.0, happy:happy >= 1.19.5
   build-depends:       base >=4
                      , array
                      , containers
                      , transformers
                      , mtl
+                     , text
   hs-source-dirs:      src
   default-language:    Haskell2010
 

readme.md

@@ -6,11 +6,8 @@ A simple, terminating, pure, hindley milner lambda calculus with inductively def
 
 Depends:
   * BNFC
-  * GNU make
   * GHC
   * Cabal
 
 Instructions:
-  * Run `bnfc -dm --text-token --functor hm.cf`
-  * Run `make`
   * Run `cabal build`

src/.gitignore

@@ -0,0 +1 @@
+Hm