feat(update): Add update command

Cargo.toml

@@ -37,6 +37,8 @@ tar = "0.4"
 semver = "1"
 sqlformat = "0.5.0"
 sysinfo = { version = "0.38.4", default-features = false, features = ["system"] }
+self_update = { version = "0.42", default-features = false, features = ["rustls"] }
+lzma-rs = "0.3"
 
 [dev-dependencies]
 mockito = "1"

src/command.rs

@@ -223,6 +223,9 @@ pub enum Commands {
         #[arg(value_enum)]
         shell: ShellChoice,
     },
+
+    /// Update the hotdata CLI to the latest release
+    Update,
 }
 
 #[derive(Clone, clap::ValueEnum)]

src/main.rs

@@ -18,6 +18,7 @@ mod sandbox_session;
 mod skill;
 mod table;
 mod tables;
+mod update;
 mod util;
 mod workspace;
 
@@ -148,6 +149,12 @@ fn main() {
         skill::maybe_auto_update_after_cli_upgrade();
     }
 
+    // Quiet update-available notice. Skip during `hotdata update` itself so
+    // we don't talk over the updater's own output.
+    if !matches!(&cli.command, Some(Commands::Update)) {
+        update::maybe_print_update_notice();
+    }
+
     match cli.command {
         None => {
             use clap::CommandFactory;
@@ -781,6 +788,7 @@ fn main() {
                 let mut cmd = Cli::command();
                 generate(shell, &mut cmd, "hotdata", &mut std::io::stdout());
             }
+            Commands::Update => update::run_update(),
         },
     }
 }