feat: subshell total support

src/execution/execution.c

@@ -46,6 +46,9 @@ int execution(struct ast *ast, struct hash_map *vars)
     case AST_LOOP:
         res = exec_ast_loop(ast_get_loop(ast), vars);
         break;
+    case AST_SUBSHELL:
+        res = exec_ast_subshell(ast_get_subshell(ast), vars);
+        break;
     default:
         res = 127;
         break;

src/execution/execution_helpers.c

@@ -249,6 +249,33 @@ int exec_ast_if(struct ast_if *if_node, struct hash_map *vars)
     }
 }
 
+int exec_ast_subshell(struct ast_subshell *subshell_node,
+                      struct hash_map *vars)
+{
+    pid_t pid = fork();
+    if (pid < 0)
+    {
+        perror("fork");
+        return 1;
+    }
+
+    if (pid == 0)
+    {
+        int res = execution(subshell_node->child, vars);
+        _exit(res);
+    }
+
+    int status = 0;
+    waitpid(pid, &status, 0);
+
+    if (WIFEXITED(status))
+    {
+        return WEXITSTATUS(status);
+    }
+
+    return 1;
+}
+
 int exec_ast_list(struct ast_list *list_node, struct hash_map *vars)
 {
     struct list *cur = list_node->children;

src/execution/execution_helpers.h

@@ -14,6 +14,8 @@ int exec_ast_if(struct ast_if *if_node, struct hash_map *vars);
 int exec_ast_list(struct ast_list *list_node, struct hash_map *vars);
 int exec_ast_and_or(struct ast_and_or *ao_node, struct hash_map *vars);
 int exec_ast_loop(struct ast_loop *loop_node, struct hash_map *vars);
+int exec_ast_subshell(struct ast_subshell *subshell_node,
+                        struct hash_map *vars);
 
 void unset_all_redir(struct list *redir_list);
 #endif // EXECUTION_HELPERS_H

src/utils/ast/ast.c

@@ -11,8 +11,7 @@ void ast_free(struct ast **node)
 {
     if (node == NULL || *node == NULL)
     {
-        fprintf(
-            stderr,
+        fprintf(stderr,
             "WARNING: Internal error: failed to free AST node (NULL argument)");
         return;
     }
@@ -52,14 +51,16 @@ void ast_free(struct ast **node)
     case AST_FUNCTION:
         ast_free_function(ast_get_function(*node));
         break;
+    case AST_SUBSHELL:
+        ast_free_subshell(ast_get_subshell(*node));
+        break;
     case AST_VOID:
     case AST_END:
         break;
 
     default:
-        fprintf(stderr,
-                "WARNING: Internal error: failed to free an AST node (Unknown "
-                "type)");
+        fprintf(stderr, "WARNING: Internal error:"
+                " failed to free an AST node (Unknown type)");
         return;
     }