implemented for loops

src/builtin/alias.rs

@@ -30,7 +30,7 @@ pub fn alias(node: Node, io_stack: &mut IoStack, job: &mut JobBldr) -> ShResult<
 					ShErr::full(
 						ShErrKind::SyntaxErr,
 						"alias: Expected an assignment in alias args",
-						span.into()
+						span
 					)
 				)
 			};
@@ -41,3 +41,45 @@ pub fn alias(node: Node, io_stack: &mut IoStack, job: &mut JobBldr) -> ShResult<
 	state::set_status(0);
 	Ok(())
 }
+
+pub fn unalias(node: Node, io_stack: &mut IoStack, job: &mut JobBldr) -> ShResult<()> {
+	let NdRule::Command { assignments: _, argv } = node.class else {
+		unreachable!()
+	};
+
+	let (argv, io_frame) = setup_builtin(argv, job, Some((io_stack, node.redirs)))?;
+
+
+	if argv.is_empty() {
+		// Display the environment variables
+		let mut alias_output = read_logic(|l| {
+			l.aliases()
+				.iter()
+				.map(|ent| format!("{} = \"{}\"", ent.0, ent.1))
+				.collect::<Vec<_>>()
+		});
+		alias_output.sort(); // Sort them alphabetically
+		let mut alias_output = alias_output.join("\n"); // Join them with newlines
+		alias_output.push('\n'); // Push a final newline
+
+		let stdout = borrow_fd(STDOUT_FILENO);
+		write(stdout, alias_output.as_bytes())?; // Write it
+	} else {
+		for (arg,span) in argv {
+			flog!(DEBUG, arg);
+			if read_logic(|l| l.get_alias(&arg)).is_none() {
+				return Err(
+					ShErr::full(
+						ShErrKind::SyntaxErr,
+						format!("unalias: alias '{arg}' not found"),
+						span
+					)
+				)
+			};
+			write_logic(|l| l.remove_alias(&arg))
+		}
+	}
+	io_frame.unwrap().restore()?;
+	state::set_status(0);
+	Ok(())
+}