Fixes identifier lexing; support REPL file loading

src/FileEval.hs

@@ -17,3 +17,9 @@ evaluateFile filePath = do
   case Map.lookup "__result" finalEnv of
     Just finalResult -> return finalResult
     Nothing -> error "No result found in final environment"
+
+evaluateFileEnv :: FilePath -> IO Env
+evaluateFileEnv filePath = do
+  contents <- readFile filePath
+  let asts = parseTricu contents
+  pure $ evalTricu library asts