added hostname lookup

src/dorkbox/netUtil/Hosts.kt

@@ -0,0 +1,57 @@
+package dorkbox.netUtil
+
+import dorkbox.executor.Executor
+import java.net.NetworkInterface
+
+
+
+/**
+ * partially from: https://stackoverflow.com/questions/7348711/recommended-way-to-get-hostname-in-java/7353473#7353473
+ */
+object Hosts {
+    /**
+     * Gets the version number.
+     */
+    const val version = Common.version
+
+    /**
+     * Gets the hostname of the machine, using a variety of different methods.
+     */
+    val name: String by lazy {
+        var hostName: String?
+
+        hostName = Executor.run("hostname")
+
+        if (hostName.isEmpty() || hostName == "localhost") {
+            try {
+                // note: this doesn't always work!
+                val interfaces = NetworkInterface.getNetworkInterfaces()
+                while (interfaces.hasMoreElements()) {
+                    val nic: NetworkInterface = interfaces.nextElement()
+                    val addresses = nic.inetAddresses
+                    while (hostName == null && addresses.hasMoreElements()) {
+                        val address = addresses.nextElement()
+                        if (!address.isLoopbackAddress) {
+                            hostName = address.canonicalHostName
+                        }
+                    }
+                }
+            }catch (ignored: Exception) {
+            }
+        }
+
+        if (hostName.isNullOrEmpty() || hostName == "localhost") {
+            hostName = System.getenv("COMPUTERNAME")
+        }
+
+        if (hostName.isNullOrEmpty() || hostName == "localhost") {
+            hostName = System.getenv("HOSTNAME")
+        }
+
+        if (hostName.isNullOrEmpty()) {
+            hostName = "localhost"
+        }
+
+        hostName
+    }
+}