Add an option for self-updating composer (fix #318) (#346)

src/config.rs

@@ -51,6 +51,11 @@ pub enum Step {
     Tldr,
 }
 
+#[derive(Deserialize, Default, Debug)]
+pub struct Composer {
+    self_update: Option<bool>,
+}
+
 #[derive(Deserialize, Default, Debug)]
 #[serde(deny_unknown_fields)]
 /// Configuration file
@@ -73,6 +78,7 @@ pub struct ConfigFile {
     notify_each_step: Option<bool>,
     accept_all_windows_updates: Option<bool>,
     only: Option<Vec<Step>>,
+    composer: Option<Composer>,
 }
 
 impl ConfigFile {
@@ -356,6 +362,15 @@ impl Config {
         self.config_file.accept_all_windows_updates.unwrap_or(true)
     }
 
+    /// Whether Composer should update itself
+    pub fn composer_self_update(&self) -> bool {
+        self.config_file
+            .composer
+            .as_ref()
+            .and_then(|c| c.self_update)
+            .unwrap_or(false)
+    }
+
     /// Whether to send a desktop notification at the beginning of every step
     #[allow(dead_code)]
     pub fn notify_each_step(&self) -> bool {