Compiles again after command subsystem

terrified to start testing

orchid-std/src/std/stream/stream_lib.rs

@@ -1,12 +1,14 @@
+use std::num::NonZero;
+use std::rc::Rc;
+
 use orchid_base::{is, mk_errv};
-use orchid_extension::ForeignAtom;
-use orchid_extension::expr::Expr;
-use orchid_extension::func_atom::get_arg;
-use orchid_extension::gen_expr::new_atom;
-use orchid_extension::stream_reqs::ReadLimit;
+use orchid_extension::gen_expr::{call, new_atom};
+use orchid_extension::std_reqs::ReadLimit;
 use orchid_extension::tree::{GenMember, comments, fun, prefix};
+use orchid_extension::{Expr, ForeignAtom, get_arg};
 
 use crate::Int;
+use crate::std::binary::binary_atom::BlobAtom;
 use crate::std::stream::stream_cmds::ReadStreamCmd;
 
 pub fn gen_stream_lib() -> Vec<GenMember> {
@@ -30,7 +32,16 @@ pub fn gen_stream_lib() -> Vec<GenMember> {
 				Ok(new_atom(ReadStreamCmd { hand, succ, fail, limit: ReadLimit::Delimiter(end) }))
 			}),
 			fun(true, "read_bytes", async |hand: ForeignAtom, count: Int, succ: Expr, fail: Expr| {
-				Int(todo!())
+				match count.0.try_into().map(NonZero::new) {
+					Ok(Some(nzlen)) =>
+						Ok(new_atom(ReadStreamCmd { hand, succ, fail, limit: ReadLimit::Length(nzlen) })),
+					Ok(None) => Ok(call(succ, new_atom(BlobAtom(Rc::default()))).await),
+					Err(_) => Err(mk_errv(
+						is("Length cannot be negative").await,
+						format!("{} is negative and cannot be used as a length", count.0),
+						[get_arg(1).pos().await],
+					)),
+				}
 			}),
 		]),
 	)])