feat: allow installing package groups

Fixes #97

src/internal/alpm.rs

@@ -97,4 +97,19 @@ impl Alpm {
     pub fn handler(&self) -> &alpm::Alpm {
         &self.0
     }
+
+    pub fn group_packages(&self, group_name: String) -> Result<Vec<AlpmPackage>, Error> {
+        let mut packages = Vec::new();
+        for db in &self.0.syncdbs() {
+            if let Ok(group) = db.group(group_name.clone()) {
+                for package in group.packages() {
+                    packages.push(AlpmPackage::Found(package));
+                }
+            }
+        }
+        if packages.is_empty() {
+            return Err(Error::Alpm(alpm::Error::PkgNotFound));
+        }
+        Ok(packages)
+    }
 }

src/internal/sort.rs

@@ -21,6 +21,10 @@ pub async fn sort(input: &[String], options: Options) -> Sorted {
         if package_result.is_ok() {
             tracing::debug!("{} found in repos", package);
             repo_packages.push(package);
+        } else if let Ok(pkgs) = alpm.group_packages(package.clone()) {
+            tracing::debug!("{} group found in repos", package);
+            pkgs.iter()
+                .for_each(|pkg| repo_packages.push(pkg.name().to_string()));
         } else if aur_query.iter().any(|p| p.metadata.name == package) {
             tracing::debug!("{} found in AUR", package);
             aur_packages.push(package.to_string());