add install and remove packages to Backend trait

src/backend/mod.rs

@@ -7,8 +7,14 @@ use crate::Package;
 pub use pacman::Pacman;
 
 pub trait Backend {
+    /// The binary that should be called to run the associated package manager.
+    const BINARY: &'static str;
     /// Get all packages that are installed in the system.
     fn get_all_installed_packages() -> HashSet<Package>;
     /// Get all packages that were installed in the system explicitly.
     fn get_explicitly_installed_packages() -> HashSet<Package>;
+    /// Install the specified packages.
+    fn install_packages(packages: Vec<Package>);
+    /// Remove the specified packages.
+    fn remove_packages(packages: Vec<Package>);
 }

src/backend/pacman.rs

@@ -1,4 +1,6 @@
 use std::collections::HashSet;
+use std::os::unix::process::CommandExt;
+use std::process::Command;
 
 use alpm::Alpm;
 use alpm::PackageReason::Explicit;
@@ -9,6 +11,8 @@ use crate::Package;
 pub struct Pacman;
 
 impl Backend for Pacman {
+    const BINARY: &'static str = "paru";
+
     fn get_all_installed_packages() -> HashSet<Package> {
         convert_to_pacdef_packages(get_all_installed_packages_from_alpm())
     }
@@ -16,6 +20,24 @@ impl Backend for Pacman {
     fn get_explicitly_installed_packages() -> HashSet<Package> {
         convert_to_pacdef_packages(get_explicitly_installed_packages_from_alpm())
     }
+
+    fn install_packages(packages: Vec<Package>) {
+        let mut cmd = Command::new("paru");
+        cmd.arg("-S");
+        for p in packages {
+            cmd.arg(format!("{p}"));
+        }
+        cmd.exec();
+    }
+
+    fn remove_packages(packages: Vec<Package>) {
+        let mut cmd = Command::new("paru");
+        cmd.arg("-Rsn");
+        for p in packages {
+            cmd.arg(format!("{p}"));
+        }
+        cmd.exec();
+    }
 }
 
 fn get_all_installed_packages_from_alpm() -> HashSet<String> {