Minibox: Add a somewhat improved shell

This shell actually lexes and produces a AST which makes it easier to
add features and will makes it more difficult to introduce bugs. So
basically it is just better code.

1 files changed, 36 insertions, 0 deletions

diff --git a/userland/minibox/utilities/sh/ast.h b/userland/minibox/utilities/sh/ast.h
new file mode 100644
index 0000000..7e7aaff
--- /dev/null
+++ b/userland/minibox/utilities/sh/ast.h
@@ -0,0 +1,36 @@
+#ifndef AST_H
+#define AST_H
+#include "lexer.h"
+
+typedef enum {
+  AST_VALUE_STRING,
+} ast_value_type_t;
+
+struct AST_VALUE {
+  ast_value_type_t type;
+  union {
+    char *string;
+  };
+};
+
+typedef enum {
+  AST_COMMAND,
+  AST_EXPRESSION,
+  AST_CONDITIONAL_AND,
+  AST_CONDITIONAL_NOT,
+} ast_type_t;
+
+struct AST {
+  ast_type_t type;
+  struct AST_VALUE val;
+  struct AST *children;
+  struct AST *pipe_rhs; // in "func1 | func2" func2 is the piped rhs
+  int file_out_fd_to_use;
+  int file_out_append;
+  const char *file_out; // in "func1 > file.txt" file.txt is the file_out
+  struct AST *next;
+};
+
+void free_ast(struct AST *ast);
+struct AST *generate_ast(struct TOKEN *token);
+#endif // AST_H