#43 new: bsd base support

lib/data/model/server/system.dart

@@ -0,0 +1,34 @@
+import 'package:toolbox/data/model/app/shell_func.dart';
+
+enum SystemType {
+  linux._(linuxSign),
+  bsd._(bsdSign),
+  ;
+
+  final String value;
+
+  const SystemType._(this.value);
+
+  static SystemType? parse(String? value) {
+    if (value == null) return null;
+    switch (value) {
+      case linuxSign:
+        return SystemType.linux;
+      case bsdSign:
+        return SystemType.bsd;
+    }
+    return null;
+  }
+
+  bool isSegmentsLenMatch(int len) {
+    switch (this) {
+      case SystemType.linux:
+        return len == StatusCmdType.values.length;
+      case SystemType.bsd:
+        return len == BSDStatusCmdType.values.length;
+    }
+  }
+}
+
+const linuxSign = 'linux';
+const bsdSign = 'bsd';