commit - 510b79eba6902f991d857c5b41f6291466dabe00
commit + a4f410d9500b9babe01f7d6ae891e8cd3377deed
blob - 1b4c60656b86f81cf8ace1d49bbb966e1a65f72e
blob + 1a44f0ccf6ce98c28933541eab3bb7dd5fef7b47
--- src/main.rs
+++ src/main.rs
@@ -2,22 +2,27 @@
 //
 // SPDX-License-Identifier: GPL-3.0-only
 
-use clap::Parser;
+use clap::{Parser, Subcommand};
 use raur::Raur;
 
 #[derive(Debug, Clone, Parser)]
-#[clap(author, version, about)]
+#[command(author, version, about)]
 struct Arguments {
+    #[command(subcommand)]
+    command: Commands,
+}
+
+#[derive(Debug, Clone, PartialEq, Subcommand)]
+enum Commands {
     /// Show packages flagged out-of-date.
-    #[clap(short, value_parser)]
-    flagged: bool,
+    Flagged,
 }
 
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
     let args = Arguments::parse();
 
-    let filter = if args.flagged {
+    let filter = if args.command == Commands::Flagged {
         flagged_filter
     } else {
         |_: &raur::Package| true