feat: show live battery charge by default

src/editor.rs

@@ -1354,6 +1354,8 @@ pub struct Editor {
     top_bar: ChromeLine,
     bottom_bar: ChromeLine,
     labels: BTreeMap<String, String>,
+    battery_charge: Option<u8>,
+    battery_label: String,
     quit: bool,
     capabilities: Vec<String>,
     features: HashMap<String, Feature>,
@@ -1442,6 +1444,8 @@ impl Editor {
             top_bar: ChromeLine::top(),
             bottom_bar: ChromeLine::bottom(),
             labels: BTreeMap::new(),
+            battery_charge: None,
+            battery_label: String::new(),
             quit: false,
             capabilities,
             features: HashMap::new(),
@@ -3840,6 +3844,9 @@ impl Editor {
     pub fn label(&self, name: &str) -> &str {
         self.labels.get(name).map_or("", String::as_str)
     }
+    pub fn battery_label(&self) -> &str {
+        &self.battery_label
+    }
     pub fn path(&self) -> Option<&Path> {
         self.active.path.as_deref()
     }
@@ -3921,6 +3928,20 @@ impl Editor {
         Ok(true)
     }
 
+    pub(crate) fn set_battery_charge(&mut self, charge: Option<u8>) -> bool {
+        let charge = charge.filter(|charge| *charge <= 100);
+        if self.battery_charge == charge {
+            return false;
+        }
+        self.battery_charge = charge;
+        self.battery_label.clear();
+        if let Some(charge) = charge {
+            use std::fmt::Write as _;
+            write!(self.battery_label, "bat {charge}%").unwrap();
+        }
+        true
+    }
+
     pub fn register(&mut self, feature: Feature) -> Result<(), String> {
         self.install(feature, false)
     }
@@ -17816,6 +17837,54 @@ mod tests {
         assert_eq!(editor.text_revision(), 0);
     }
 
+    #[test]
+    fn native_battery_cache_validates_changes_without_editing_or_replacing_labels() {
+        let mut editor = editor();
+        editor.handle(Input::Char('i'));
+        editor.handle(Input::Paste("document".into()));
+        editor.handle(Input::Escape);
+        editor.handle(Input::Char('v'));
+        let text = editor.context().text;
+        let selection = editor.selections();
+        let revision = editor.text_revision();
+        let history = (editor.active.undo.len(), editor.active.redo.len());
+        assert_eq!(editor.battery_label(), "");
+        assert!(!editor.set_battery_charge(None));
+        assert!(!editor.set_battery_charge(Some(101)));
+        assert!(editor.set_battery_charge(Some(27)));
+        assert_eq!(editor.battery_label(), "bat 27%");
+        assert!(!editor.set_battery_charge(Some(27)));
+        assert_eq!(editor.label("battery"), "");
+
+        editor.set_label("battery".into(), "custom".into()).unwrap();
+        assert!(editor.set_battery_charge(Some(0)));
+        assert_eq!(editor.battery_label(), "bat 0%");
+        assert_eq!(editor.label("battery"), "custom");
+        assert!(editor.set_battery_charge(Some(100)));
+        assert_eq!(editor.battery_label(), "bat 100%");
+        assert!(editor.set_battery_charge(Some(255)));
+        assert_eq!(editor.battery_label(), "");
+        assert!(!editor.set_battery_charge(None));
+        assert_eq!(editor.label("battery"), "custom");
+        assert_eq!(editor.context().text, text);
+        assert_eq!(editor.selections(), selection);
+        assert_eq!(editor.mode(), Mode::Visual);
+        assert_eq!(editor.text_revision(), revision);
+        assert_eq!(
+            (editor.active.undo.len(), editor.active.redo.len()),
+            history
+        );
+
+        assert!(editor.set_battery_charge(Some(28)));
+        editor.execute("tab.new");
+        assert_eq!(editor.battery_label(), "bat 28%");
+        editor.set_label("battery".into(), String::new()).unwrap();
+        assert_eq!(editor.battery_label(), "bat 28%");
+        assert_eq!(editor.label("battery"), "");
+        assert!(editor.set_battery_charge(None));
+        assert_eq!(editor.battery_label(), "");
+    }
+
     #[test]
     fn named_labels_sanitize_and_survive_tabs_until_independently_cleared() {
         let mut editor = editor();