Support for single line comment syntax using --

src/Lexer.hs

@@ -3,6 +3,8 @@ module Lexer where
 import Research
 import Text.Megaparsec
 import Text.Megaparsec.Char
+
+import Control.Monad (void)
 import Data.Void
 import qualified Data.Set as Set
 
@@ -21,6 +23,7 @@ data LToken
   | LOpenBracket
   | LCloseBracket
   | LNewline
+  | LComment String
   deriving (Show, Eq, Ord)
 
 keywordT :: Lexer LToken
@@ -72,8 +75,16 @@ closeBracket = char ']' *> pure LCloseBracket
 lnewline :: Lexer LToken
 lnewline = char '\n' *> pure LNewline
 
+comment :: Lexer LToken
+comment = do
+  string "--"
+  content <- many (satisfy (/= '\n'))
+  optional (char '\n')
+  pure (LComment content)
+
+
 sc :: Lexer ()
-sc = skipMany (char ' ' <|> char '\t')
+sc = skipMany (void (char ' ') <|> void (char '\t') <|> void comment)
 
 saplingLexer :: Lexer [LToken]
 saplingLexer = many (sc *> choice

src/REPL.hs

@@ -5,11 +5,10 @@ import Lexer
 import Parser
 import Research
 
-import Control.Monad         		 (void)
 import Data.List                 (intercalate)
 import qualified Data.Map as Map
 import System.Console.Haskeline
-import System.IO            		 (hFlush, stdout)
+import System.IO                 (hFlush, stdout)
 
 repl :: Map.Map String T -> IO ()
 repl env = runInputT defaultSettings (loop env)