windows: hostname java optional

Author: scivision

+stdlib/hostname.m

@@ -1,12 +1,14 @@
 
 %% HOSTNAME get hostname of local machine
-% requires: java
+% optional: java
 %
 % Ref: https://docs.oracle.com/javase/8/docs/api/java/net/InetAddress.html#getHostName--
 
 function n = hostname()
 
-if stdlib.isoctave()
+if ispc()
+  n = string(System.Environment.MachineName);
+elseif stdlib.isoctave()
   n = gethostname();
 else
   n = string(java.net.InetAddress.getLocalHost().getHostName());

test/TestJava.m

@@ -38,11 +38,6 @@ function test_username(tc)
 tc.verifyGreaterThan(strlength(u), 0)
 end
 
-function test_hostname(tc)
-h = stdlib.hostname();
-tc.verifyGreaterThan(strlength(h), 0)
-end
-
 function test_java_vendor(tc)
 v = stdlib.java_vendor();
 tc.verifyGreaterThan(strlength(v), 0)

test/TestSys.m

@@ -9,13 +9,18 @@
 methods (Test, TestTags="impure")
 
 function test_platform_logical(tc, fun)
-
 tc.verifyClass(fun, 'logical')
 end
 
 function test_platform_int32(tc, fi32)
 tc.verifyClass(fi32, 'int32')
 end
 
+function test_hostname(tc)
+tc.assumeTrue(ispc() || stdlib.has_java())
+h = stdlib.hostname();
+tc.verifyGreaterThan(strlength(h), 0)
+end
+
 end
 end