brew autoremove (#6)

Authored-by: Kilian Tyler <kilian@ktyler.me>
Approved-by: Thomas Schönauer <t.schoenauer@hgs-wt.at>

src/config.rs

@@ -202,6 +202,7 @@ pub struct Flatpak {
 #[serde(deny_unknown_fields)]
 pub struct Brew {
     greedy_cask: Option<bool>,
+    autoremove: Option<bool>,
 }
 
 #[derive(Debug, Deserialize, Clone, Copy)]
@@ -668,6 +669,15 @@ impl Config {
             .unwrap_or(false)
     }
 
+    /// Whether Brew should autoremove
+    pub fn brew_autoremove(&self) -> bool {
+        self.config_file
+            .brew
+            .as_ref()
+            .and_then(|c| c.autoremove)
+            .unwrap_or(false)
+    }
+
     /// Whether Composer should update itself
     pub fn composer_self_update(&self) -> bool {
         self.config_file