feat: add the dirname command

coreutils/src/commands/dirname.rs

@@ -0,0 +1,36 @@
+use std::path::Path;
+
+use boxutils::{args::ArgParser, commands::Command};
+
+pub struct Dirname;
+
+impl Command for Dirname {
+    fn execute(&self) {
+        let args = ArgParser::builder()
+            .add_flag("--help")
+            .parse_args("dirname");
+
+        if args.get_normal_args().len() != 1 || args.get_flag("--help") {
+            println!("Usage: dirname FILENAME");
+            return;
+        }
+
+        // note(teesh): we have already checked for argnums, so we're fine :D
+        let normal_args = args.get_normal_args();
+        let file = normal_args.get(0).unwrap();
+        let path = Path::new(file);
+
+        if let Some(parent) = path.parent() {
+            let mut to_print = format!("{}", parent.display());
+
+            // note(teesh): this is stupid, but thats how the box busies
+            if to_print == "" {
+                to_print = ".".into();
+            }
+
+            println!("{}", to_print);
+        } else {
+            println!("dirname: could not get parent")
+        }
+    }
+}

coreutils/src/commands/mod.rs

@@ -25,3 +25,4 @@ command!(base32::Base32);
 command!(seq::Seq);
 command!(env::Env);
 command!(ln::Ln);
+command!(dirname::Dirname);

src/registry.rs

@@ -35,6 +35,7 @@ pub fn get_registry() -> CommandRegistry {
         "seq" => coreutils::commands::Seq,
         "env" => coreutils::commands::Env,
         "ln" => coreutils::commands::Ln,
+        "dirname" => coreutils::commands::Dirname,
         "box" => Boxcmd
     });