refactor: removed duplicate code for while/until loops in parser

src/parser/grammar_basic.c

@@ -349,7 +349,15 @@ struct ast *parse_shell_command(struct lexer_context *ctx)
     {
         return parse_if_rule(ctx);
     }
-    // TODO loops and case
+    else if (is_first(*token, RULE_WHILE))
+    {
+        return parse_while(ctx);
+    }
+    else if (is_first(*token, RULE_UNTIL))
+    {
+        return parse_until(ctx);
+    }
+    // TODO for and case
     else
     {
         perror("Syntax error: unexpected token in parse_shell_command");