hard_link_count: more robust

Author: scivision

+stdlib/+java/hard_link_count.m

@@ -1,9 +1,15 @@
 function i = hard_link_count(file)
 
+
+i = [];
+if stdlib.strempty(file)
+  return
+end
+
 try
   i = java.nio.file.Files.getAttribute(javaAbsolutePath(file), "unix:nlink", java.nio.file.LinkOption.values());
 catch e
   javaException(e)
-  i = [];
 end
+
 end

+stdlib/+python/hard_link_count.m

@@ -3,6 +3,7 @@
 try
   c = double(py.os.stat(file).st_nlink);
 catch e
+  pythonException(e)
   c = [];
 end
 

+stdlib/+sys/hard_link_count.m

@@ -17,14 +17,16 @@
   cmd = sprintf('stat -c %%h ''%s''', file);
 end
 
-if stdlib.exists(file)
-  [status, output] = system(cmd);
-  if status == 0
-    if ispc()
-      n = 1 + startsWith(output, "HardLink");
-    else
-      n = str2double(output);
-    end
+if stdlib.strempty(file)
+  return
+end
+
+[status, output] = system(cmd);
+if status == 0
+  if ispc()
+    n = 1 + startsWith(output, "HardLink");
+  else
+    n = str2double(output);
   end
 end
 

test/TestDisk.m

@@ -99,6 +99,9 @@ function test_hard_link_count(tc, B_hard_link_count)
 tc.assertEqual(char(b), B_hard_link_count)
 
 tc.verifyGreaterThanOrEqual(i, 1)
+
+i = stdlib.hard_link_count('');
+tc.verifyEmpty(i)
 end