Add MacOS support

src/main/java/org/gzipper/java/application/model/OS.java

@@ -25,7 +25,7 @@
  */
 public enum OS {
 
-    UNIX("Unix", 3), WINDOWS("Windows", 11);
+    UNIX("Unix", 3), WINDOWS("Windows", 11), MAC("MacOS", 7);
 
     /**
      * The name of the operating system.

src/main/java/org/gzipper/java/application/model/OperatingSystem.java

@@ -39,6 +39,23 @@ public OperatingSystem(OS operatingSystem) {
         _operatingSystem = operatingSystem;
     }
 
+    /**
+     * Creates a new instance of {@link OperatingSystem} by parsing the specified name of an operating system.
+     *
+     * @param osName the name of the operating system.
+     * @return a new instance of {@link OperatingSystem}.
+     */
+    public static OperatingSystem create(String osName) {
+        osName = osName.toLowerCase();
+        if (osName.contains("windows")) {
+            return new OperatingSystem(OS.WINDOWS);
+        } else if (osName.contains("mac")) {
+            return new OperatingSystem(OS.MAC);
+        } else {
+            return new OperatingSystem(OS.UNIX);
+        }
+    }
+
     /**
      * Returns the default user directory of the system.
      *
@@ -56,4 +73,9 @@ public String getDefaultUserDirectory() {
     public OS getOsInfo() {
         return _operatingSystem;
     }
+
+    @Override
+    public String toString() {
+        return _operatingSystem.toString();
+    }
 }

src/main/java/org/gzipper/java/presentation/GZipper.java

@@ -67,12 +67,8 @@ private void initApplication() {
             }
         }
 
-        // determine operating system and initialize settings class
-        OperatingSystem os = System.getProperty("os.name")
-                .toLowerCase().startsWith("windows")
-                ? new OperatingSystem(OS.WINDOWS)
-                : new OperatingSystem(OS.UNIX);
-
+        var os = OperatingSystem.create(System.getProperty("os.name"));
+        Log.i("Determined operating system: " + os, false);
         Settings.getInstance().init(settings, os);
     }