feat: add the sleep command

coreutils/src/commands/mod.rs

@@ -16,3 +16,4 @@ command!(r#false::False);
 command!(test::Test);
 command!(yes::Yes);
 command!(pwd::Pwd);
+command!(sleep::Sleep);

coreutils/src/commands/sleep.rs

@@ -0,0 +1,36 @@
+use boxutils::{args::ArgParser, commands::Command};
+
+pub struct Sleep;
+
+impl Command for Sleep {
+    fn execute(&self) {
+        let args = ArgParser::builder().parse_args("sleep");
+        let mut sleep_for = 0;
+
+        for arg in args.get_normal_args() {
+            if arg.chars().last().unwrap().is_numeric() {
+                sleep_for += arg.parse::<i32>().unwrap();
+            } else {
+                let multiplier = match arg.chars().last().unwrap() {
+                    's' => 1,
+                    'm' => 60,
+                    'h' => 3600,
+                    'd' => 86400,
+                    _ => {
+                        println!("Invalid time interval '{}'", arg);
+                        return;
+                    }
+                };
+
+                sleep_for += arg[..arg.len() - 1].parse::<i32>().unwrap() * multiplier;
+            }
+        }
+
+        if sleep_for == 0 {
+            println!("Usage: sleep [N]...");
+            return;
+        }
+
+        std::thread::sleep(std::time::Duration::from_secs(sleep_for as u64));
+    }
+}

src/registry.rs

@@ -26,6 +26,7 @@ pub fn get_registry() -> CommandRegistry {
         "[" => coreutils::commands::Test::with_bracket(),
         "yes" => coreutils::commands::Yes,
         "pwd" => coreutils::commands::Pwd,
+        "sleep" => coreutils::commands::Sleep,
         "box" => Boxcmd
     });