Add new API call for batteryinfo

Will return battery:"true/false" if one exists

If one exists, it will also return "level":"1-99"
and "status":"offline/charging/backup/unknown"

REST Request:
-------------------------------
PUT /sysadm/systeminfo
{
   "action" : "batteryinfo"
}

REST Response:
-------------------------------
{
    "args": {
        "batteryinfo": {
            "battery": "false"
        }
    }
}

WebSocket Request:
-------------------------------
{
   "namespace" : "sysadm",
   "name" : "systeminfo",
   "id" : "fooid",
   "args" : {
      "action" : "batteryinfo"
   }
}

WebSocket Response:
-------------------------------
{
  "args": {
    "batteryinfo": {
      "battery": "false"
    }
  },
  "id": "fooid",
  "name": "response",
  "namespace": "sysadm"
}

src/library/sysadm-systeminfo.cpp

@@ -12,8 +12,42 @@ using namespace sysadm;
 
 //PLEASE: Keep the functions in the same order as listed in pcbsd-general.h
 
+
+//Battery Availability
+QJsonObject SysInfo::batteryInfo(){
+  QJsonObject retObject;
+  bool ok;
+
+  int val = General::RunCommand("apm -l").toInt(&ok);
+  if ( ok && (val >= 0 && val <= 100) ) {
+    retObject.insert("battery", "true");
+  } else {
+    retObject.insert("battery", "false");
+    return retObject;
+  }
+
+  // We have a battery, return info about it
+  //Battery Charge Level
+  QString tmp;
+  tmp.setNum(val);
+  retObject.insert("level", tmp);
+
+  //Battery Charging State
+  int state = General::RunCommand("apm -a").toInt(&ok);
+  if ( ok && state == 0 )
+    retObject.insert("status", "offline");
+  else if ( ok && state == 1 )
+    retObject.insert("status", "charging");
+  else if ( ok && state == 2 )
+    retObject.insert("status", "backup");
+  else
+    retObject.insert("status", "unknown");
+
+  return retObject;
+}
+
 // ==== ExternalDevicePaths() ====
-QJsonObject SysInfo::ExternalDevicePaths() {
+QJsonObject SysInfo::externalDevicePaths() {
   QJsonObject retObject;
 
   //Returns: QStringList[<type>::::<filesystem>::::<path>]

src/library/sysadm-systeminfo.h

@@ -14,7 +14,8 @@ namespace sysadm{
 
 class SysInfo{
 public:
-	static QJsonObject ExternalDevicePaths();
+	static QJsonObject batteryInfo();
+	static QJsonObject externalDevicePaths();
 };
 	
 } //end of pcbsd namespace

src/server/WebBackend.cpp

@@ -257,7 +257,11 @@ RestOutputStruct::ExitCode WebSocket::EvaluateSysadmSystemInfoRequest(const QJso
       QString act = JsonValueToString(in_args.toObject().value("action"));
       if(act=="externalmounts"){
 	ok = true;
-        out->insert("externalmounts", sysadm::SysInfo::ExternalDevicePaths());
+        out->insert("externalmounts", sysadm::SysInfo::externalDevicePaths());
+      }
+      if(act=="batteryinfo"){
+	ok = true;
+        out->insert("batteryinfo", sysadm::SysInfo::batteryInfo());
       }
 
     } //end of "action" key usage