fix: Add display for unknown battery state (#316)

src/module.rs

@@ -75,6 +75,20 @@ impl<'a> Module<'a> {
         self.segments.last_mut().unwrap()
     }
 
+    /// Should config exists, get a reference to a newly created segment in the module
+    pub fn new_segment_if_config_exists(&mut self, name: &str) -> Option<&mut Segment> {
+        // Use the provided value unless overwritten by config
+        if let Some(value) = self.config_value_str(name) {
+            let mut segment = Segment::new(name);
+            segment.set_style(self.style);
+            segment.set_value(value);
+            self.segments.push(segment);
+            Some(self.segments.last_mut().unwrap())
+        } else {
+            None
+        }
+    }
+
     /// Whether a module has non-empty segments
     pub fn is_empty(&self) -> bool {
         self.segments.iter().all(|segment| segment.is_empty())

src/modules/battery.rs

@@ -45,6 +45,17 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
             battery::State::Discharging => {
                 module.new_segment("discharging_symbol", BATTERY_DISCHARGING);
             }
+            battery::State::Unknown => {
+                log::debug!("Unknown detected");
+                module.new_segment_if_config_exists("unknown_symbol")?;
+            }
+            battery::State::Empty => {
+                module.new_segment_if_config_exists("empty_symbol")?;
+            }
+            _ => {
+                log::debug!("Unhandled battery state `{}`", state);
+                return None;
+            }
             _ => return None,
         }