Adds "compiler" and CLI argument handling

src/Compiler.hs

@@ -0,0 +1,23 @@
+module Compiler where
+
+import Eval
+import Parser
+import Research
+
+import System.IO
+
+import qualified Data.Map as Map
+
+evaluateFile :: FilePath -> IO T
+evaluateFile filePath = do
+  contents <- readFile filePath
+  let linesOfFile = lines contents
+  let env = foldl evaluateLine Map.empty linesOfFile
+  case Map.lookup "__result" env of
+    Just finalResult -> return finalResult
+    Nothing -> error "No result found in final environment"
+
+evaluateLine :: Env -> String -> Env
+evaluateLine env line =
+  let ast = parseSingle line
+  in evalSingle env ast

src/Library.hs

@@ -6,7 +6,7 @@ import Research
 
 import qualified Data.Map as Map
 
-library :: Map.Map String T
+library :: Env
 library = evalTricu Map.empty $ parseTricu $ unlines 
   [ "false = t" 
   , "true = t t"

src/Main.hs

@@ -1,5 +1,6 @@
 module Main where
 
+import Compiler
 import Eval     (evalTricu, result)
 import Library  (library)
 import Parser   (parseTricu)
@@ -7,16 +8,40 @@ import REPL     (repl)
 import Research (T)
 
 import Text.Megaparsec (runParser)
+import System.Console.CmdArgs
 
 import qualified Data.Map as Map
 
+data TricuArgs
+  = Repl
+  | Compile { file :: FilePath }
+  deriving (Show, Data, Typeable)
+
+replMode :: TricuArgs
+replMode = Repl
+  &= help "Start interactive REPL"
+  &= auto
+  &= name "repl"
+
+compileMode :: TricuArgs
+compileMode = Compile { file = def &= typ "FILE" &= help "Relative or absolute path to compile" }
+  &= help "Compile a file and return the result of the expression in the final line"
+  &= explicit
+  &= name "compile"
+
 main :: IO ()
 main = do
-  putStrLn "Welcome to the tricu Interpreter"
+  args <- cmdArgs $ modes [replMode, compileMode]
-  putStrLn "You can exit at any time by typing and entering: "
+    &= help "tricu: Exploring Tree Calculus"
-  putStrLn ":_exit"
+    &= program "tricu"
-  repl library
+    &= summary "tricu - compiler and repl"
+
+  case args of
+    Repl -> do
+      putStrLn "Welcome to the tricu REPL"
+      putStrLn "You can exit with `CTRL+D` or the `:_exit` command.`"
+      repl Map.empty
+    Compile filePath -> do
+      result <- evaluateFile filePath
+      print result
 
-runTricu :: String -> T
-runTricu s = result (evalTricu Map.empty $ parseTricu s)
-runTricuEnv env s = result (evalTricu env $ parseTricu s)

src/REPL.hs

@@ -12,10 +12,10 @@ import System.Console.Haskeline
 
 import qualified Data.Map as Map
 
-repl :: Map.Map String T -> IO ()
+repl :: Env -> IO ()
 repl env = runInputT defaultSettings (loop env)
   where
-    loop :: Map.Map String T -> InputT IO ()
+    loop :: Env -> InputT IO ()
     loop env = do
       minput <- getInputLine "tricu < "
       case minput of
@@ -28,7 +28,7 @@ repl env = runInputT defaultSettings (loop env)
           newEnv <- liftIO $ (processInput env input `catch` errorHandler env)
           loop newEnv
 
-    processInput :: Map.Map String T -> String -> IO (Map.Map String T)
+    processInput :: Env -> String -> IO (Env)
     processInput env input = do
       let clearEnv = Map.delete "__result" env
           newEnv = evalSingle clearEnv (parseSingle input)
@@ -39,7 +39,7 @@ repl env = runInputT defaultSettings (loop env)
         Nothing -> return ()
       return newEnv
 
-    errorHandler :: Map.Map String T -> SomeException -> IO (Map.Map String T)
+    errorHandler :: Env -> SomeException -> IO (Env)
     errorHandler env e = do
       putStrLn $ "Error: " ++ show e
       return env

src/Research.hs

@@ -89,6 +89,8 @@ toList (Fork x rest) = case toList rest of
 toList _ = Left "Invalid Tree Calculus list"
 
 -- Utility
+type Env = Map.Map String T 
+
 toAscii :: T -> String
 toAscii tree = go tree "" True
   where

test.tri

@@ -0,0 +1,2 @@
+x = t t t
+x

tricu.cabal

@@ -19,6 +19,7 @@ executable tricu
   default-extensions:
       ConstraintKinds
       DataKinds
+      DeriveDataTypeable
       DeriveGeneric
       FlexibleContexts
       FlexibleInstances
@@ -28,11 +29,13 @@ executable tricu
   ghc-options: -threaded -rtsopts -with-rtsopts=-N -optl-pthread -fPIC
   build-depends:
     base >=4.7
+    , cmdargs
     , containers
     , haskeline
     , megaparsec
     , mtl
   other-modules:
+    Compiler
     Eval
     Lexer
     Library
@@ -47,6 +50,7 @@ test-suite tricu-tests
   hs-source-dirs:      test, src
   build-depends:       
     base
+    , cmdargs
     , containers
     , haskeline
     , megaparsec
@@ -56,6 +60,7 @@ test-suite tricu-tests
     , tasty-quickcheck
   default-language:    Haskell2010
   other-modules:
+    Compiler
     Eval
     Lexer
     Library