is_exe: java, python optional and much faster

Author: scivision

+stdlib/+java/is_exe.m

@@ -0,0 +1,11 @@
+function y = is_exe(p)
+
+y = isfile(p);
+
+if ispc()
+  y = y && stdlib.native.has_windows_executable_suffix(p);
+end
+
+y = y && javaObject("java.io.File", p).canExecute();
+
+end

+stdlib/private/has_windows_executable_suffix.m renamed to +stdlib/+native/has_windows_executable_suffix.m

@@ -0,0 +1,31 @@
+function y = is_exe(p)
+
+y = isfile(p);
+
+if ispc()
+  y = y && stdlib.native.has_windows_executable_suffix(p);
+end
+
+if ~y, return, end
+
+
+if ~isMATLABReleaseOlderThan('R2025a')
+
+  if isunix
+    props = ["UserExecute", "GroupExecute", "OtherExecute"];
+  else
+    props = "Readable";
+  end
+
+  t = getPermissions(filePermissions(p), props);
+
+  y = any(t{1, :});
+
+else
+
+  a = stdlib.native.file_attributes(p);
+  y = a.UserExecute || a.GroupExecute || a.OtherExecute;
+
+end
+
+end

+stdlib/+native/is_exe.m

@@ -12,7 +12,7 @@
   end
 
   t = getPermissions(filePermissions(p), props);
-  y = t.Readable;
+  y = any(t{1, :});
 
 else
 

+stdlib/+native/is_readable.m

@@ -12,7 +12,7 @@
   end
 
   t = getPermissions(filePermissions(p), props);
-  y = t.Writable;
+  y = any(t{1, :});
 
 else
   a = stdlib.native.file_attributes(p);

+stdlib/+native/is_writable.m

@@ -0,0 +1,11 @@
+function y = is_exe(p)
+
+y = isfile(p);
+
+if ispc()
+  y = y && stdlib.native.has_windows_executable_suffix(p);
+end
+
+y = y && py.os.access(p, py.os.X_OK);
+
+end

+stdlib/+python/is_exe.m

@@ -51,7 +51,7 @@
 
 if isa(v, "matlab.io.WindowsPermissions") || ispc()
 
-  if p(1) == 'r' && has_windows_executable_suffix(f)
+  if p(1) == 'r' && stdlib.native.has_windows_executable_suffix(f)
     p(3) = 'x';
   end
 

+stdlib/get_permissions.m

@@ -2,38 +2,18 @@
 %
 % false if not a file
 
-function ok = is_exe(p)
+function y = is_exe(p)
 arguments
-  p string
+  p {mustBeTextScalar}
 end
 
-ok(size(p)) = false;
-
-i = isfile(p);
-
-if ispc()
-  i = i & has_windows_executable_suffix(p(i));
-end
-
-if ~any(i), return, end
-
-if ~isMATLABReleaseOlderThan('R2025a')
-
-  if isunix
-    props = ["UserExecute", "GroupExecute", "OtherExecute"];
-  else
-    props = "Readable";
-  end
-
-  t = getPermissions(filePermissions(p(i)), props);
-
-  ok(i) = any(t{:,:}, 2);
-
+% Java or Python are like 100x faster than Matlab native
+if stdlib.has_java()
+  y = stdlib.java.is_exe(p);
+elseif stdlib.has_python()
+  y = stdlib.python.is_exe(p);
 else
-
-  a = stdlib.native.file_attributes(p);
-  ok = a.UserExecute || a.GroupExecute || a.OtherExecute;
-
+  y = stdlib.native.is_exe(p);
 end
 
 end

+stdlib/is_exe.m

@@ -2,6 +2,7 @@
 
 properties (TestParameter)
 p = {{fileparts(mfilename('fullpath')) + "/../Readme.md", false}, {"not-exist", false}}
+fun = {@stdlib.is_exe, @stdlib.java.is_exe, @stdlib.python.is_exe, @stdlib.native.is_exe}
 end
 
 methods(TestClassSetup)
@@ -13,24 +14,29 @@ function pkg_path(tc)
 
 methods(Test, TestTags="impure")
 
-function test_is_exe(tc, p)
-tc.verifyEqual(stdlib.is_exe(p{1}), p{2})
+function test_is_exe(tc, p, fun)
+is_capable(tc, fun)
+
+tc.verifyEqual(fun(p{1}), p{2})
 end
 
 
-function test_is_exe_dir(tc)
-tc.verifyFalse(stdlib.is_exe('.'))
+function test_is_exe_dir(tc, fun)
+is_capable(tc, fun)
+
+tc.verifyFalse(fun('.'))
 end
 
 
-function test_matlab_exe(tc)
+function test_matlab_exe(tc, fun)
+is_capable(tc, fun)
 
 f = fullfile(matlabroot, "bin/matlab");
 if ispc()
   f = f + ".exe";
 end
 
-tc.verifyTrue(stdlib.is_exe(f))
+tc.verifyTrue(fun(f))
 end
 
 end