diff --git a/README.md b/README.md
index e6b3a8f..3f59fd2 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
-# Really Bad Compiler in Haskell
+# HEAR Compiler in Haskell
 
-A compiler written in Haskell which can currently perform basic arithmetic. Currently using the megaparsec and llvm-hs-\* libraries, but I may reimplement certain libraries myself. Built for the Introduction to Compiler Design class at The University of Texas at Dallas.
+A compiler for HEAR, a language for when you cannot C.
+
+Written in Haskell, and currently using the megaparsec and llvm-hs-\* libraries, but I plan to eventually rewrite the lexar/parser from scratch. Built for the Introduction to Compiler Design class at The University of Texas at Dallas.
 
 Main repo: https://git.sudoer.ch/me/really-bad-compiler-in-haskell
 
@@ -8,13 +10,19 @@ Main repo: https://git.sudoer.ch/me/really-bad-compiler-in-haskell
 
 - Install `ghcup` (for managing Haskell tools) and `nix` (for managing external dependencies).
 - Clone the repo.
-- Use `ghcup` to install `stack 2.9.3`, `HLS 2.2.0.0`, `GHC 9.2.8`, and `cabal 3.6.2.0`.
+- Use `ghcup` to install `stack 2.11.1`, `HLS 2.3.0.0`, and `cabal 3.8.1.0`.
 
 ## Run Instructions
 
-- Use `stack run <file>` to run the program (for example, `stack run example/1`).
+- Use `stack run <file>` to run the program (for example, `stack run example/1.hear`).
 - The LLVM will be generated as `a.out.ll`, and the executable will be generated as `a.out`.
 
+## Currently Supported functionality
+
+- Arithmetic
+- Parenthesis
+- print() statement
+
 ## To edit
 
 I recommend using VSCodium, which is preconfigured to have syntax highlighting and (currently broken) debugging features and will automatically suggest the Haskell extensions to install.
@@ -44,12 +52,13 @@ I recommend using VSCodium, which is preconfigured to have syntax highlighting a
 - https://danieljharvey.github.io/posts/2023-02-08-llvm-compiler-part-1.html (for help using llvm-hs-pure)
 - https://gh.sudoer.ch/danieljharvey/mimsa/blob/trunk/llvm-calc/src/Calc/Compile/ToLLVM.hs (source code for above resource)
 - https://9to5tutorial.com/homebrew-compiler-made-with-haskell-llvm-configuration (for help using llvm-hs-pure)
+- https://blog.ocharles.org.uk/blog/posts/2012-12-17-24-days-of-hackage-optparse-applicative.html (for help parsing command line arguments with optparse-applicative)
 
 ### Tools
 
 - Language: Haskell
-- Haskell tools: GHCup, Stack, Cabal, GHC 9.2
-- Libraries: megaparsec, parser-combinators, text, process, llvm-hs 15, llvm-hs-pure 15,
+- Haskell/management tools: GHCup, Stack, Cabal, GHC 9.2, Nix
+- Libraries: See `package.yaml`
 - Dependencies: llvm 15, clang 15
 - IDE: VSCodium
 - Git platform: Forgejo
diff --git a/example/1 b/example/1
deleted file mode 100644
index 0f9d1ef..0000000
--- a/example/1
+++ /dev/null
@@ -1 +0,0 @@
-5*3+2
\ No newline at end of file
diff --git a/example/1.hear b/example/1.hear
new file mode 100644
index 0000000..62b1f81
--- /dev/null
+++ b/example/1.hear
@@ -0,0 +1 @@
+print(5*(3-2)+-4-4);
\ No newline at end of file
diff --git a/example/2 b/example/2
deleted file mode 100644
index 50f4893..0000000
--- a/example/2
+++ /dev/null
@@ -1 +0,0 @@
-6+8/3
\ No newline at end of file
diff --git a/example/2.hear b/example/2.hear
new file mode 100644
index 0000000..977a5ab
--- /dev/null
+++ b/example/2.hear
@@ -0,0 +1,2 @@
+ print(6+8/3);
+ print(5000);
\ No newline at end of file
diff --git a/main/Compiler/LLVMGen.hs b/main/Compiler/LLVMGen.hs
deleted file mode 100644
index d36277d..0000000
--- a/main/Compiler/LLVMGen.hs
+++ /dev/null
@@ -1,67 +0,0 @@
-{-# LANGUAGE ImportQualifiedPost #-}
-{-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE RecursiveDo #-}
-
--- see https://gh.sudoer.ch/danieljharvey/mimsa/blob/trunk/llvm-calc/src/Calc/Compile/ToLLVM.hs
-
-module Compiler.LLVMGen (llvmGen) where
-
--- import LLVM.Pretty
-
-import Data.ByteString (ByteString)
-import Debug.Trace
-import LLVM (moduleLLVMAssembly, withModuleFromAST, writeLLVMAssemblyToFile)
-import LLVM.AST hiding (function)
-import LLVM.AST.Type
-import LLVM.Context
-import LLVM.IRBuilder.Constant
-import LLVM.IRBuilder.Instruction
-import LLVM.IRBuilder.Module
-import LLVM.IRBuilder.Monad
-import Types.Expr as Expr
-
-getLLVM :: Expr -> Module
-getLLVM expr =
-  buildModule "program" $ mdo
-    -- TODO: better module name
-    printf <- externVarArgs "printf" [ptr] i32
-    function "main" [] i32 $ \_ -> mdo
-      numFormatStr <- globalStringPtr "%d\n" (mkName "str")
-      ourExpression <- exprToLLVM expr
-      _ <- call (FunctionType i32 [ptr] True) printf [(ConstantOperand numFormatStr, []), (ourExpression, [])]
-      ret (int32 0)
-
-exprToLLVM ::
-  ( MonadIRBuilder m,
-    MonadModuleBuilder m
-  ) =>
-  Expr ->
-  m Operand
-exprToLLVM (Lit prim) = pure $ primToLLVM prim
-exprToLLVM (Expr.Add a b) = mdo
-  lhs <- exprToLLVM a
-  rhs <- exprToLLVM b
-  add lhs rhs
-exprToLLVM (Expr.Sub a b) = mdo
-  lhs <- exprToLLVM a
-  rhs <- exprToLLVM b
-  sub lhs rhs
-exprToLLVM (Expr.Mul a b) = mdo
-  lhs <- exprToLLVM a
-  rhs <- exprToLLVM b
-  mul lhs rhs
-exprToLLVM (Expr.Div a b) = mdo
-  lhs <- exprToLLVM a
-  rhs <- exprToLLVM b
-  sdiv lhs rhs
-
-primToLLVM :: Int -> Operand
-primToLLVM i = int32 (fromIntegral i)
-
-llvmGen :: Expr -> IO ByteString
-llvmGen expr = do
-  let l = getLLVM expr
-  withContext
-    ( \c ->
-        withModuleFromAST c l moduleLLVMAssembly
-    )
\ No newline at end of file
diff --git a/main/Main.hs b/main/Main.hs
deleted file mode 100644
index dda57c6..0000000
--- a/main/Main.hs
+++ /dev/null
@@ -1,28 +0,0 @@
-{-# LANGUAGE ImportQualifiedPost #-}
-{-# LANGUAGE OverloadedStrings #-}
-
-module Main (main) where
-
--- import Compiler.ExeGen
-import Compiler.LLVMGen
-import Data.ByteString.Char8 qualified as B
-import Data.Text.Lazy.IO qualified as T
-import Parser.Expr
-import System.Environment
-import System.Process
-import Types.Expr
-
-getRight :: ParseResult -> Expr
-getRight (Right r) = r
-
-main :: IO ()
-main = do
-  fileName <- fmap head getArgs
-  contents <- readFile fileName
-  T.putStrLn "- Parsing file..."
-  let parsed = getRight (parseExpr contents)
-  T.putStrLn "- Generating LLVM to './a.out.ll'..."
-  llvmGen parsed >>= B.writeFile "a.out.ll"
-  T.putStrLn "- Compiling to executable './a.out'..."
-  callCommand "clang a.out.ll"
-  T.putStrLn "- Done."
diff --git a/main/Parser/Expr.hs b/main/Parser/Expr.hs
deleted file mode 100644
index a2f3f4c..0000000
--- a/main/Parser/Expr.hs
+++ /dev/null
@@ -1,49 +0,0 @@
--- see https://markkarpov.com/tutorial/megaparsec.html
-{-# LANGUAGE ImportQualifiedPost #-}
-
-module Parser.Expr (parseExpr, ParseResult) where
-
-import Control.Monad.Combinators.Expr
-import Data.Functor.Identity qualified
-import Data.Void (Void)
-import Text.Megaparsec as MP
-import Text.Megaparsec.Char as C
-import Text.Megaparsec.Char.Lexer as L
-import Types.Expr
-
-type Parser = Parsec Void String
-
-lexemeParser :: Parser a -> Parser a
-lexemeParser = L.lexeme C.space
-
-symbolParser :: String -> Parser String
-symbolParser = L.symbol C.space
-
-intParser :: Parser Int
-intParser = lexemeParser L.decimal
-
-term :: Parser Expr
-term = Lit <$> intParser
-
-table :: [[Operator Parser Expr]]
-table =
-  [ [ binaryOp "*" Mul,
-      binaryOp "/" Div
-    ],
-    [ binaryOp "+" Add,
-      binaryOp "-" Sub
-    ]
-  ]
-
-binaryOp :: String -> (a -> a -> a) -> Operator (ParsecT Void String Data.Functor.Identity.Identity) a
-binaryOp name f = InfixL (f <$ symbolParser name)
-
-expr :: Parser Expr
-expr = makeExprParser term table
-
-type ParseResult = Either (ParseErrorBundle String Void) Expr
-
-parseExpr :: String -> ParseResult
-parseExpr = MP.parse (C.space *> expr <* eof) ""
-
--- parseE = parseExpr
\ No newline at end of file
diff --git a/main/Types/Expr.hs b/main/Types/Expr.hs
deleted file mode 100644
index 51c8925..0000000
--- a/main/Types/Expr.hs
+++ /dev/null
@@ -1,11 +0,0 @@
-module Types.Expr (Expr (..)) where
-
-data Expr
-  = Lit Int
-  | Add Expr Expr
-  | Sub Expr Expr
-  | Mul Expr Expr
-  | Div Expr Expr
-  deriving
-    ( Show
-    )
\ No newline at end of file
diff --git a/package.yaml b/package.yaml
index 99c82b0..5e889c5 100644
--- a/package.yaml
+++ b/package.yaml
@@ -7,9 +7,14 @@ dependencies:
   - parser-combinators
   - text
   - process
+  - mtl
+  - containers
   - llvm-hs >= 15 && < 16
   - llvm-hs-pure >= 15 && < 16
   - bytestring
+  - string-conversions
+  - transformers
+  - optparse-applicative >= 0.17 && < 1
 tested-with: GHC == 9.2.8
 category: Compilers/Interpreters
 
@@ -19,7 +24,7 @@ ghc-options: -threaded -Wall -j8 +RTS -A64M -RTS -fllvm
 #   source-dirs: src
 
 executable:
-  source-dirs: main
+  source-dirs: src
   main: Main.hs
 # tests:
 #   testall:
diff --git a/really-bad-compiler-in-haskell.cabal b/really-bad-compiler-in-haskell.cabal
index d82f626..0b1bace 100644
--- a/really-bad-compiler-in-haskell.cabal
+++ b/really-bad-compiler-in-haskell.cabal
@@ -1,6 +1,6 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.35.1.
+-- This file has been generated from package.yaml by hpack version 0.35.2.
 --
 -- see: https://github.com/sol/hpack
 
@@ -16,22 +16,27 @@ tested-with:
 executable really-bad-compiler-in-haskell
   main-is: Main.hs
   other-modules:
-      Compiler.LLVMGen
-      Parser.Expr
-      Types.Expr
+      Main.LLVMGen
+      Main.Parser.Megaparsec
+      Main.Type
       Paths_really_bad_compiler_in_haskell
   hs-source-dirs:
-      main
+      src
   default-extensions:
       OverloadedStrings, LambdaCase
   ghc-options: -threaded -Wall -j8 +RTS -A64M -RTS -fllvm
   build-depends:
       base >=4.14.3 && <5
     , bytestring
+    , containers
     , llvm-hs ==15.*
     , llvm-hs-pure ==15.*
     , megaparsec >=9.0.1 && <10
+    , mtl
+    , optparse-applicative >=0.17 && <1
     , parser-combinators
     , process
+    , string-conversions
     , text
+    , transformers
   default-language: Haskell2010
diff --git a/src/Main.hs b/src/Main.hs
new file mode 100644
index 0000000..dee11e3
--- /dev/null
+++ b/src/Main.hs
@@ -0,0 +1,47 @@
+{-# LANGUAGE ImportQualifiedPost #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Main (main) where
+
+import Data.ByteString.Char8 qualified as B
+import Data.Text.IO qualified as T
+import Main.LLVMGen
+import Main.Parser.Megaparsec
+import Options.Applicative
+import System.Environment
+import System.Process (callCommand)
+
+data Opt = Opt
+  { filePath :: String,
+    showLLVM :: Bool,
+    showDebug :: Bool
+  }
+
+run :: Opt -> IO ()
+run opts = do
+  let fileName = filePath opts
+  contents <- T.readFile fileName
+  T.putStrLn "- Generating LLVM to './a.out.ll'..."
+  result <- (llvmGen . parse) contents
+  B.writeFile "a.out.ll" result
+  T.putStrLn "- Compiling to executable './a.out'..."
+  callCommand "clang a.out.ll"
+  T.putStrLn "- Done."
+
+main :: IO ()
+main = execParser opts >>= run
+  where
+    parser =
+      Opt
+        <$> argument str (metavar "FILE_PATH")
+        <*> switch
+          ( short 'l'
+              <> long "showLLVM"
+              <> help "Create <file>.ll with LLVM used to compile the binary"
+          )
+        <*> switch
+          ( short 'd'
+              <> long "showDebug"
+              <> help "Show debug output"
+          )
+    opts = info parser mempty
diff --git a/src/Main/LLVMGen.hs b/src/Main/LLVMGen.hs
new file mode 100644
index 0000000..620e168
--- /dev/null
+++ b/src/Main/LLVMGen.hs
@@ -0,0 +1,115 @@
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE ImportQualifiedPost #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE RecursiveDo #-}
+
+-- see https://gh.sudoer.ch/danieljharvey/mimsa/blob/trunk/llvm-calc/src/Calc/Compile/ToLLVM.hs
+-- see https://blog.josephmorag.com/posts/mcc3/
+
+module Main.LLVMGen (llvmGen) where
+
+import Control.Monad.State
+import Control.Monad.Trans.Class (lift)
+import Data.ByteString (ByteString)
+import Data.Map qualified as M
+import Data.String.Conversions
+import Data.Text
+import LLVM (moduleLLVMAssembly, withModuleFromAST)
+import LLVM.AST hiding (function)
+import LLVM.AST.Type
+import LLVM.Context
+import LLVM.IRBuilder.Constant
+import LLVM.IRBuilder.Instruction
+import LLVM.IRBuilder.Module
+import LLVM.IRBuilder.Monad
+import Main.Type as Expr
+
+data Env = Env
+  { operands :: M.Map Text Operand,
+    strings :: M.Map Text Operand
+  }
+  deriving (Eq, Show)
+
+registerOperand :: (MonadState Env m) => Text -> Operand -> m ()
+registerOperand name op =
+  modify $ \env -> env {operands = M.insert name op (operands env)}
+
+registerString :: (MonadState Env m) => Text -> Operand -> m ()
+registerString name op =
+  modify $ \env -> env {strings = M.insert name op (operands env)}
+
+getOperand :: (MonadState Env m, MonadModuleBuilder m, MonadIRBuilder m) => Text -> m Operand
+getOperand name = do
+  env <- get
+  case M.lookup name (operands env) of
+    Just op -> return op
+    Nothing -> error $ "Unknown operand: " ++ show name
+
+getString :: (MonadState Env m, MonadModuleBuilder m, MonadIRBuilder m) => Text -> m Operand
+getString str = do
+  env <- get
+  case M.lookup str (strings env) of
+    Just s -> return s
+    Nothing -> do
+      s <- globalStringPtr (unpack str) (mkName "str")
+      let operand = ConstantOperand s
+      modify $ \env -> env {strings = M.insert str operand (strings env)}
+      return operand
+
+getLLVM :: [Expr] -> Module
+getLLVM expr =
+  flip evalState (Env {operands = M.empty, strings = M.empty}) $
+    buildModuleT "program" $ mdo
+      -- TODO: better module name
+      printf <- externVarArgs "printf" [ptr] i32
+      lift $ registerOperand "printf" printf
+      function "main" [] i32 $ \_ -> mdo
+        printNumStr <- globalStringPtr "%d\n" (mkName "str")
+        lift $ registerString "%d\n" $ ConstantOperand printNumStr
+        _ <- forM_ expr exprToLLVM
+        ret $ int32 0
+
+--
+-- ourExpression <- exprToLLVM expr
+-- _ <- call (FunctionType i32 [ptr] True) printf [(ConstantOperand numFormatStr, []), (ourExpression, [])]
+-- ret $ int32 0
+
+exprToLLVM ::
+  ( MonadIRBuilder m,
+    MonadModuleBuilder m,
+    MonadState Env m
+  ) =>
+  Expr ->
+  m Operand
+exprToLLVM (Lit prim) = pure $ primToLLVM prim
+exprToLLVM (Paren e) = exprToLLVM e
+exprToLLVM (Print e) = mdo
+  val <- exprToLLVM e
+  printf <- getOperand "printf"
+  formatStr <- getString "%d\n"
+  _ <- call (FunctionType i32 [ptr] True) printf [(formatStr, []), (val, [])]
+  pure val
+exprToLLVM (Expr.Add a b) = mdo
+  lhs <- exprToLLVM a
+  rhs <- exprToLLVM b
+  add lhs rhs
+exprToLLVM (Expr.Sub a b) = mdo
+  lhs <- exprToLLVM a
+  rhs <- exprToLLVM b
+  sub lhs rhs
+exprToLLVM (Expr.Mul a b) = mdo
+  lhs <- exprToLLVM a
+  rhs <- exprToLLVM b
+  mul lhs rhs
+exprToLLVM (Expr.Div a b) = mdo
+  lhs <- exprToLLVM a
+  rhs <- exprToLLVM b
+  sdiv lhs rhs
+
+primToLLVM :: Int -> Operand
+primToLLVM i = int32 $ fromIntegral i
+
+llvmGen :: [Expr] -> IO ByteString
+llvmGen expr = do
+  let l = getLLVM expr
+  withContext $ \c -> withModuleFromAST c l moduleLLVMAssembly
\ No newline at end of file
diff --git a/src/Main/Parser/Megaparsec.hs b/src/Main/Parser/Megaparsec.hs
new file mode 100644
index 0000000..aa1ea72
--- /dev/null
+++ b/src/Main/Parser/Megaparsec.hs
@@ -0,0 +1,78 @@
+-- see https://markkarpov.com/tutorial/megaparsec.html
+{-# LANGUAGE ImportQualifiedPost #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Main.Parser.Megaparsec (parse) where
+
+import Control.Monad.Combinators.Expr
+import Data.Functor.Identity qualified
+import Data.Text
+import Data.Void (Void)
+import Main.Type
+import Text.Megaparsec as MP hiding (parse)
+import Text.Megaparsec qualified as MP
+import Text.Megaparsec.Char qualified as C
+import Text.Megaparsec.Char.Lexer qualified as L
+
+type Parser = Parsec Void Text
+
+lexeme :: Parser a -> Parser a
+lexeme = L.lexeme C.space
+
+symbol :: Text -> Parser Text
+symbol = L.symbol C.space
+
+int :: Parser Int
+int = lexeme $ L.signed (return ()) L.decimal
+
+string :: Text -> Parser Text
+string = C.string
+
+container :: Text -> Text -> Parser a -> Parser a
+container b e = between (symbol b) (symbol e)
+
+term :: Parser Expr
+term =
+  choice
+    [ Lit <$> int,
+      container "(" ")" expr
+    ]
+
+table :: [[Operator Parser Expr]]
+table =
+  [ [methodOp "print" Print],
+    [ binaryOp "*" Mul,
+      binaryOp "/" Div
+    ],
+    [ binaryOp "+" Add,
+      binaryOp "-" Sub
+    ]
+  ]
+
+binaryOp :: Text -> (a -> a -> a) -> Operator (ParsecT Void Text Data.Functor.Identity.Identity) a
+binaryOp name f = InfixL $ f <$ symbol name
+
+-- prefixOp :: Text -> (a -> a) -> Operator (ParsecT Void Text Data.Functor.Identity.Identity) a
+-- prefixOp name f = Prefix (f <$ symbol name)
+
+methodOp :: Text -> (a -> a) -> Operator (ParsecT Void Text Data.Functor.Identity.Identity) a
+methodOp name f = Prefix $ f <$ (string name <* C.space)
+
+-- postfixOp :: Text -> (a -> a) -> Operator (ParsecT Void Text Data.Functor.Identity.Identity) a
+-- postfixOp name f = Postfix (f <$ symbol name)
+
+expr :: Parser Expr
+expr = makeExprParser term table
+
+statement :: Parser Expr
+statement = expr <* symbol ";"
+
+parseExpr :: Text -> Either (ParseErrorBundle Text Void) [Expr]
+parseExpr = MP.parse (C.space *> many statement <* eof) ""
+
+parse :: Text -> [Expr]
+parse t =
+  case parseExpr t of
+    Right r -> r
+
+-- TODO: add error handling
\ No newline at end of file
diff --git a/src/Main/Type.hs b/src/Main/Type.hs
new file mode 100644
index 0000000..23178b8
--- /dev/null
+++ b/src/Main/Type.hs
@@ -0,0 +1,30 @@
+module Main.Type
+  ( Expr (..),
+  -- AST (..)
+  )
+where
+
+import Data.Graph (Tree (Node))
+
+data Expr
+  = Lit Int
+  | Paren Expr
+  | Add Expr Expr
+  | Sub Expr Expr
+  | Mul Expr Expr
+  | Div Expr Expr
+  | Print Expr
+  deriving
+    ( Show
+    )
+
+-- data AST = AST Node
+
+-- data Node
+--   = Reg
+--       { cur :: Expr,
+--         next :: Node
+--       }
+--   | End
+--       { cur :: Expr
+--       }
\ No newline at end of file
diff --git a/stack.yaml b/stack.yaml
index 45dc800..c54066b 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,4 +1,11 @@
 resolver: lts-20.26
+compiler: ghc-9.2.8
+# setup-info:
+#   ghc:
+#     aarch64:
+#       9.4.6:
+#         url: "https://downloads.haskell.org/~ghc/9.4.6/ghc-9.4.6-aarch64-deb10-linux.tar.xz"
+#         sha256: "05896fc4bc52c117d281eac9c621c6c3a0b14f9f9eed5e42cce5e1c4485c7623"
 
 packages:
   - .
@@ -12,4 +19,4 @@ nix:
   enable: true
   packages: [llvm_15, clang_15, libxml2]
 system-ghc: true
-install-ghc: true
+install-ghc: false