Implemented assignments, working on job control

src/builtin/echo.rs

@@ -0,0 +1,30 @@
+use crate::{libsh::error::ShResult, parse::{execute::prepare_argv, NdRule, Node}, prelude::*, procio::{borrow_fd, IoStack}};
+
+pub fn echo(node: Node, io_stack: &mut IoStack) -> ShResult<()> {
+	let NdRule::Command { assignments: _, argv } = node.class else {
+		unreachable!()
+	};
+	assert!(!argv.is_empty());
+
+	for redir in node.redirs {
+		io_stack.push_to_frame(redir);
+	}
+	let mut io_frame = io_stack.pop_frame();
+
+	io_frame.redirect()?;
+
+	let stdout = borrow_fd(STDOUT_FILENO);
+
+	let mut echo_output = prepare_argv(argv)
+		.into_iter()
+		.skip(1) // Skip 'echo'
+		.collect::<Vec<_>>()
+		.join(" ");
+
+	echo_output.push('\n');
+
+	write(stdout, echo_output.as_bytes())?;
+
+	io_frame.restore()?;
+	Ok(())
+}