✨ print the defaut version if no argument

Author: masan4444

src/commands/default.rs

@@ -5,7 +5,7 @@ use thiserror::Error;
 
 #[derive(clap::Parser, Debug)]
 pub struct Default {
-    link_version: version::Local,
+    link_version: Option<version::Local>,
 }
 
 #[derive(Error, Debug)]
@@ -18,10 +18,19 @@ impl Command for Default {
     type Error = Error;
 
     fn run(&self, config: &Config) -> Result<(), Error> {
-        let cmd = super::Alias {
-            alias: crate::version::Alias::default(),
-            link_version: self.link_version,
-        };
-        cmd.run(config).map_err(Into::into)
+        let alias = crate::version::Alias::default();
+        if let Some(link_version) = self.link_version {
+            let cmd = super::Alias {
+                alias,
+                link_version,
+            };
+            cmd.run(config).map_err(Into::into)
+        } else {
+            match alias.resolve(config.aliases_dir()) {
+                Ok(version) => println!("{}", version),
+                Err(_) => println!("none"),
+            }
+            Ok(())
+        }
     }
 }