make --sub a required option

src/main.rs

@@ -31,11 +31,7 @@ enum Commands {
 
         /// The sub-packages to add
         #[arg(short, long)]
-        sub: Option<Vec<String>>,
-
-        /// decide whether to install the default sub-themes
-        #[arg(long)]
-        no_default: bool,
+        sub: Vec<String>,
     },
 
     /// Remove a theme
@@ -63,11 +59,7 @@ fn main() {
             pkg::Manifest::update().unwrap();
         }
 
-        Commands::Add {
-            theme,
-            sub,
-            no_default,
-        } => {
+        Commands::Add { theme, sub } => {
             let pkg = Manifest::get(&theme)
                 .expect("Theme not found")
                 .store_package()
@@ -76,21 +68,7 @@ fn main() {
             let mut installed_pkg =
                 InstalledPackage::get(&theme).unwrap_or_else(|_| pkg.install().unwrap());
 
-            let mut subs = if no_default {
-                Vec::new()
-            } else {
-                pkg.default.iter().map(|x| x.to_owned()).collect()
-            };
-
-            if let Some(sub) = sub {
-                for id in &sub {
-                    if !subs.contains(id) {
-                        subs.push(id.clone());
-                    }
-                }
-            }
-
-            for id in &subs {
+            for id in &sub {
                 installed_pkg.add_sub(id, &pkg).unwrap();
             }
             installed_pkg.save().unwrap();