is_exe simplify

Author: scivision

+stdlib/+legacy/is_exe.m

@@ -6,19 +6,23 @@
 %%% Outputs
 % ok: true if path is a file and has executable permissions
 %
-% the legacy backend is like 40x faster than native.
+% this method is like 40x faster than native.
 
-function [ok, b] = is_exe(file)
+function y = is_exe(file)
 arguments
-  file string
+  file (1,1) string
 end
 
-if isscalar(file)
-  ok = stdlib.legacy.is_exe(file);
-  b = 'legacy';
-else
-  ok = stdlib.native.is_exe(file);
-  b = 'native';
+y = false;
+
+if ispc() && ~stdlib.native.has_windows_executable_suffix(file)
+  return
+end
+
+a = stdlib.legacy.file_attributes(file);
+
+if ~isempty(a)
+  y = ~a.directory && (a.UserExecute || a.GroupExecute || a.OtherExecute);
 end
 
 end

+stdlib/+native/is_exe.m

@@ -0,0 +1,29 @@
+function y = is_exe(file)
+arguments
+  file string
+end
+
+y = false;
+
+if ispc() && ~stdlib.native.has_windows_executable_suffix(file)
+  return
+end
+
+if isunix
+  props = ["UserExecute", "GroupExecute", "OtherExecute"];
+else
+  props = "Readable";
+end
+
+try
+  y = getPermissions(filePermissions(file), props);
+catch e
+  switch e.identifier
+    case 'MATLAB:io:filesystem:filePermissions:CannotFindLocation'
+      y = logical.empty;
+    otherwise
+      rethrow(e)
+  end
+end
+
+end

+stdlib/is_exe.m

@@ -31,30 +31,13 @@ function test_is_exe(tc, p)
 end
 
 
-function test_is_exe_legacy(tc, p)
-r = stdlib.legacy.is_exe(p{1});
-tc.verifyEqual(r, p{2})
-end
-
-
 function test_is_executable_binary(tc, peb)
 b = stdlib.is_executable_binary(peb{1});
 tc.verifyEqual(b, peb{2}, peb{1})
 end
 end
 
 
-methods (Test, TestTags={'R2025a'})
-function test_is_exe_array(tc)
-tc.assumeFalse(isMATLABReleaseOlderThan('R2025a'))
-n = fullfile(matlabroot, "bin/matlab");
-if ispc()
-  n = n + ".exe";
-end
-r = stdlib.is_exe(["Readme.md", tempname(), n]);
-tc.verifyEqual(r, [false, false, true])
-end
-end
 
 end