+extern int cgit_open_filter(struct cgit_filter *filter);
+extern int cgit_close_filter(struct cgit_filter *filter);
+
+extern void cgit_prepare_repo_env(struct cgit_repo * repo);
+
+extern int readfile(const char *path, char **buf, size_t *size);
+
+extern char *expand_macros(const char *txt);