feat: full-at (#649)

* feat: full-at

* fix(man): typo

man/waybar-battery.5.scd

@@ -18,6 +18,10 @@ The *battery* module displays the current capacity and state (eg. charging) of y
 	typeof: string ++
 	The adapter to monitor, as in /sys/class/power_supply/ instead of auto detect.
 
+*full-at* ++
+	typeof: integer ++
+	Define the max percentage of the battery, usefull for an old battery, e.g. 96
+
 *interval* ++
 	typeof: integer ++
 	default: 60 ++

src/modules/battery.cpp

@@ -115,6 +115,16 @@ const std::tuple<uint8_t, float, std::string> waybar::modules::Battery::getInfos
       time_remaining = -(float)(total_energy_full - total_energy) / total_power;
     }
     uint16_t capacity = total / batteries_.size();
+    // Handle full-at
+    if (config_["full-at"].isUInt()) {
+      auto full_at = config_["full-at"].asUInt();
+      if (full_at < 100) {
+        capacity = static_cast<float>(capacity / full_at) * 100;
+        if (capacity > full_at) {
+          capacity = full_at;
+        }
+      }
+    }
     return {capacity, time_remaining, status};
   } catch (const std::exception& e) {
     spdlog::error("Battery: {}", e.what());