partway towards commands

I got very confused and started mucking about with "spawn" when in fact all I needed was the "inline" extension type in orcx that allows the interpreter to expose custom constants.

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

@@ -0,0 +1,37 @@
+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::tree::{GenMember, comments, fun, prefix};
+
+use crate::Int;
+use crate::std::stream::stream_cmds::ReadStreamCmd;
+
+pub fn gen_stream_lib() -> Vec<GenMember> {
+	prefix("std", [comments(
+		["Read from and write to byte streams"],
+		prefix("stream", [
+			fun(true, "read_bin", async |hand: ForeignAtom, succ: Expr, fail: Expr| {
+				new_atom(ReadStreamCmd { hand, succ, fail, limit: ReadLimit::End })
+			}),
+			fun(true, "read_until", async |hand: ForeignAtom, delim: Int, succ: Expr, fail: Expr| {
+				let Ok(end) = delim.0.try_into() else {
+					return Err(mk_errv(
+						is("Byte out of range").await,
+						format!(
+							"{} doesn't fit into a byte and cannot be used as a delimiter for reading",
+							delim.0
+						),
+						[get_arg(1).pos().await],
+					));
+				};
+				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!())
+			}),
+		]),
+	)])
+}