add more generic backend stuff

src/backend/mod.rs

@@ -8,29 +8,50 @@ use std::process::Command;
 use crate::Package;
 
 pub use pacman::Pacman;
+use rust::Rust;
+
+pub fn get_backends() -> Vec<Box<dyn Backend>> {
+    let pacman = Pacman;
+    let rust = Rust;
+    vec![Box::new(pacman), Box::new(rust)]
+}
+
 type Switches = &'static [&'static str];
 type Binary = &'static str;
 
 pub trait Backend {
     /// The binary that should be called to run the associated package manager.
-    const BINARY: Binary;
+    fn get_binary() -> Binary
+    where
+        Self: Sized;
 
     /// The switches that signals the `BINARY` that the packages should be installed.
-    const SWITCHES_INSTALL: Switches;
+    fn get_switches_install() -> Switches
+    where
+        Self: Sized;
 
     /// The switches that signals the `BINARY` that the packages should be removed.
-    const SWITCHES_REMOVE: Switches;
+    fn get_switches_remove() -> Switches
+    where
+        Self: Sized;
 
     /// Get all packages that are installed in the system.
-    fn get_all_installed_packages() -> HashSet<Package>;
+    fn get_all_installed_packages() -> HashSet<Package>
+    where
+        Self: Sized;
 
     /// Get all packages that were installed in the system explicitly.
-    fn get_explicitly_installed_packages() -> HashSet<Package>;
+    fn get_explicitly_installed_packages() -> HashSet<Package>
+    where
+        Self: Sized;
 
     /// Install the specified packages.
-    fn install_packages(packages: Vec<Package>) {
-        let mut cmd = Command::new(Self::BINARY);
-        cmd.args(Self::SWITCHES_INSTALL);
+    fn install_packages(packages: Vec<Package>)
+    where
+        Self: Sized,
+    {
+        let mut cmd = Command::new(Self::get_binary());
+        cmd.args(Self::get_switches_install());
         for p in packages {
             cmd.arg(format!("{p}"));
         }
@@ -38,9 +59,12 @@ pub trait Backend {
     }
 
     /// Remove the specified packages.
-    fn remove_packages(packages: Vec<Package>) {
-        let mut cmd = Command::new(Self::BINARY);
-        cmd.args(Self::SWITCHES_REMOVE);
+    fn remove_packages(packages: Vec<Package>)
+    where
+        Self: Sized,
+    {
+        let mut cmd = Command::new(Self::get_binary());
+        cmd.args(Self::get_switches_remove());
         for p in packages {
             cmd.arg(format!("{p}"));
         }