BatteryService: implement basic functionality to set battery treshold

Services/BatteryService.qml

@@ -1,6 +1,7 @@
 pragma Singleton
 
 import Quickshell
+import Quickshell.Io
 import Quickshell.Services.UPower
 import qs.Commons
 import qs.Services
@@ -8,6 +9,15 @@ import qs.Services
 Singleton {
   id: root
 
+  enum ChargingMode {
+    Full,
+    Balanced,
+    Conservative
+  }
+
+  property int chargingMode: BatteryService.ChargingMode.Balanced
+  readonly property string batteryTresholdScript: Quickshell.shellDir + '/Bin/set-battery-treshold.sh'
+
   // Choose icon based on charge and charging state
   function getIcon(percent, charging, isReady) {
     if (!isReady) {
@@ -28,4 +38,37 @@ Singleton {
       return "battery"
     }
   }
+
+  function setChargingMode(newMode) {
+    switch (newMode) {
+    case BatteryService.ChargingMode.Full:
+      BatteryService.chargingMode = newMode
+      chargeLimitProcess.command = [batteryTresholdScript, "100"]
+      break
+    case BatteryService.ChargingMode.Balanced:
+      BatteryService.chargingMode = newMode
+      chargeLimitProcess.command = [batteryTresholdScript, "80"]
+      break
+    case BatteryService.ChargingMode.Conservative:
+      BatteryService.chargingMode = newMode
+      chargeLimitProcess.command = [batteryTresholdScript, "60"]
+      break
+    default:
+      return
+    }
+    chargeLimitProcess.running = true
+  }
+
+  Process {
+    id: chargeLimitProcess
+    workingDirectory: Quickshell.shellDir
+    running: false
+    stderr: StdioCollector {
+      onStreamFinished: {
+        if (this.text) {
+          Logger.warn("BatteryService", "ChargeLimitProcess stderr:", this.text)
+        }
+      }
+    }
+  }
 }