strempty: more correct

Author: scivision

+stdlib/+java/filesystem_type.m

@@ -12,7 +12,7 @@
 end
 
 t = '';
-if ~strlength(file), return, end
+if stdlib.strempty(file), return, end
 
 try %#ok<TRYNC>
   t = char(java.nio.file.Files.getFileStore(javaPathObject(file)).type);

+stdlib/+java/get_owner.m

@@ -15,7 +15,7 @@
 % https://docs.oracle.com/en/java/javase/22/docs/api/java.base/java/nio/file/LinkOption.html
 
 n = "";
-if ~strlength(file), return, end
+if stdlib.strempty(file), return, end
 
 file = stdlib.absolute(file);
 % Java 1.8 benefits from absolute.

+stdlib/+python/get_owner.m

@@ -5,7 +5,7 @@
 
 n = "";
 
-if ~strlength(file), return, end
+if stdlib.strempty(file), return, end
 
 try %#ok<TRYNC>
   n = string(py.pathlib.Path(file).owner());

+stdlib/+sys/is_removable.m

@@ -9,7 +9,9 @@
 
 if ispc()
   r = stdlib.root_name(filepath);
-  if ~strlength(r), return, end
+  if stdlib.strempty(r)
+    return
+  end
   r = extractBefore(r, 2);
 
   psFile = fullfile(fileparts(mfilename('fullpath')), "isRemovableDrive.ps1");

+stdlib/parent.m

@@ -15,7 +15,7 @@
 
 p = fileparts(stdlib.drop_slash(file));
 
-i = ~strlength(p);
+i = stdlib.strempty(p);
 p(i) = ".";
 
 % the ~all(i) is for Windows Matlab < R2025a

+stdlib/private/pvt_python_version.m

@@ -4,7 +4,7 @@
 
 pe = pyenv();
 vs = pe.Version;
-if ~strlength(vs), return, end
+if stdlib.strempty(vs), return, end
 
 % this line may error like
 % "Python Error: TypeError: cannot create 'sys.version_info' instances"

+stdlib/strempty.m

@@ -1,7 +1,12 @@
 %% STREMPTY is the char | string empty
+% that means literally string.empty OR strlength == 0
 
 function y = strempty(s)
 
-y = isempty(s) | strlength(s) == 0;
+if isempty(s)
+  y = true;
+else
+  y = strlength(s) == 0;
+end
 
 end

private/get_compiler.m

@@ -31,7 +31,9 @@
   comp = co.Details.CompilerExecutable;
   % disp(lang + " compiler: " + co.ShortName + " " + co.Name + " " + co.Version + " " + comp)
 end
-if ~strlength(comp), return, end
+if stdlib.strempty(comp)
+  return
+end
 
 if ispc()
   if isempty(co)