file_size: speed, simplify

Author: scivision

+stdlib/file_size.m

@@ -3,26 +3,19 @@
 %%% Inputs
 % * p: path to file
 %%% Outputs
-% * s: size in bytes; NaN if file does not exist
+% * s: size in bytes; empty if file does not exist
 
 function s = file_size(p)
 arguments
-  p string
+  p (1,1) string
 end
 
-s = NaN(size(p));
+s = [];
 
-i = isfile(p);
+d = dir(p);
 
-if ~any(i)
-  return
-elseif isscalar(p)
-  d = dir(p);
-else
-  d = arrayfun(@dir, p(i));
+if isscalar(d) && ~d.isdir
+  s = d.bytes;
 end
 
-i = i & ~isempty(d);
-s(i) = [d.bytes];
-
 end

example/bench_file_size.m

@@ -16,11 +16,6 @@ function test_file_size(tc, p_file_size)
 tc.verifyGreaterThan(s, 0)
 end
 
-function test_file_size_array(tc)
-s = stdlib.file_size([mfilename("fullpath") + ".m", "not-exist", fullfile(fileparts(pwd()), "buildfile.m"), tempname()]);
-tc.verifyTrue(all([s(1) > 0, isnan(s(2)), s(3) > 0, isnan(s(4))]))
-end
-
 
 function test_null_file(tc)
 if ispc()