implement subshell, and fix vector operator[] unvalid index

2 files changed, 6 insertions, 2 deletions

diff --git a/include/eval.h b/include/eval.h
index 5c819a4..214a1ae 100644
--- a/include/eval.h
+++ b/include/eval.h
@@ -1,11 +1,12 @@
 #pragma once
 
 #include "all.h"
-#include "lexer/token.h"
+#include "lexer/lexer_class.h"
 
 namespace ov4
 {
-
+int eval_exe(const std::string &s, bool is_aync);
+int eval_tree_cd(size_t i, const T_lexer &lexer_instance, bool inside_subshell);
 void eval(char *cmdline);
 
 }
diff --git a/include/lexer/ast.h b/include/lexer/ast.h
index d4b0fd5..871afaf 100644
--- a/include/lexer/ast.h
+++ b/include/lexer/ast.h
@@ -21,6 +21,9 @@ public:
     size_t left = string::npos;
     size_t right = string::npos;
 
+    // if this is marked as `subshell`
+    // it will fork a subshell
+    // then the subshell will handler the rest
     bool subshell;
 };