stdin works on an expressin-base and not line-base now

src/helpers.c

@@ -195,6 +195,8 @@ char* read_line() {
     size_t lenmax = 100, len = lenmax;
     int c;
 
+    int nesting = 0;
+
     if(line == NULL)
         return NULL;
 
@@ -215,7 +217,13 @@ char* read_line() {
             linep = linen;
         }
 
-        if((*line++ = (char)c) == '\n')
+        *line++;
+        if((*line = (char)c) == '(')
+            ++nesting;
+        else if((*line = (char)c) == ')')
+            --nesting;
+        else if((*line = (char)c) == '\n')
+            if (nesting == 0)
                 break;
     }
     (*line)--; // we dont want the \n actually

src/parse.c

@@ -303,6 +303,8 @@ Ast_Node* parse_single_expression(char* text) {
     int index_in_text = 0;
     Ast_Node* result;
     eat_until_code(text, &index_in_text);
+    if (text[(index_in_text)] == '\0')
+        return create_ast_node_nil();
     if (text[(index_in_text)] == '(' || text[(index_in_text)] == '\'' )
         try {
             result = parse_expression(text, &index_in_text);