feat: flag and config to skip notifications by jlucktay (#5)

* feat: flag and config to skip notifications

At the end of a run, topgrade normally sends a system notification.
This change adds a command-line flag and a config-file option to
disable this behaviour.

* fix: clippy issues

Also derive Eq where PartialEq is being derived.
https://rust-lang.github.io/rust-clippy/master/index.html#derive_partial_eq_without_eq

Authored-by: James Lucktaylor <jlucktay+github@gmail.com>
Approved-by: Thomas Schönauer <t.schoenauer@hgs-wt.at>

src/config.rs

@@ -272,6 +272,7 @@ pub struct ConfigFile {
     cleanup: Option<bool>,
     notify_each_step: Option<bool>,
     accept_all_windows_updates: Option<bool>,
+    skip_notify: Option<bool>,
     bashit_branch: Option<String>,
     only: Option<Vec<Step>>,
     composer: Option<Composer>,
@@ -428,6 +429,10 @@ pub struct CommandLineArgs {
     #[clap(short = 'k', long = "keep")]
     keep_at_end: bool,
 
+    /// Skip sending a notification at the end of a run
+    #[clap(long = "skip-notify")]
+    skip_notify: bool,
+
     /// Say yes to package manager's prompt
     #[clap(short = 'y', long = "yes", arg_enum, multiple_values = true, min_values = 0)]
     yes: Option<Vec<Step>>,
@@ -613,6 +618,15 @@ impl Config {
         self.opt.keep_at_end || env::var("TOPGRADE_KEEP_END").is_ok()
     }
 
+    /// Skip sending a notification at the end of a run
+    pub fn skip_notify(&self) -> bool {
+        if let Some(yes) = self.config_file.skip_notify {
+            return yes;
+        }
+
+        self.opt.skip_notify
+    }
+
     /// Whether to set the terminal title
     pub fn set_title(&self) -> bool {
         self.config_file.set_title.unwrap_or(true)