python: use missing

dotnet_version: use missing

perl_exe: use missing

Author: scivision

+stdlib/+perl/get_uid.m

@@ -8,7 +8,7 @@
 end
 
 exe = stdlib.perl_exe();
-if stdlib.strempty(exe)
+if ismissing(exe)
   return
 end
 

+stdlib/+perl/is_admin.m

@@ -11,14 +11,14 @@
 y = missing;
 
 exe = stdlib.perl_exe();
-if stdlib.strempty(exe)
+if ismissing(exe)
   return
 end
 
 cmd = sprintf('"%s" -e "%s"', exe, c);
 
 [s, m] = system(cmd);
 
-y = s == 0 && m == "1";
+y = s == 0 && m(1) == '1';
 
 end

+stdlib/+perl/samepath.m

@@ -4,7 +4,7 @@
 
 try %#ok<TRYNC>
   exe = stdlib.perl_exe();
-  if stdlib.strempty(exe)
+  if ismissing(exe)
     return
   end
 

+stdlib/dotnet_version.m

@@ -6,7 +6,7 @@
   vs = System.Environment.Version;
   v = sprintf('%d.%d.%d', vs.Major, vs.Minor, vs.Build);
 catch
-  v = '';
+  v = missing;
 end
 
 end

+stdlib/has_perl.m

@@ -2,8 +2,7 @@
 
 function y = has_perl()
 
-y = ~isempty(stdlib.perl_version());
+v = stdlib.perl_version();
+y = ~isempty(v) && ~any(ismissing(v));
 
 end
-
-%!assert (islogical(stdlib.has_perl()))

+stdlib/has_python.m

@@ -32,7 +32,9 @@
   return
 end
 
-y = ~isempty(stdlib.python_version());
+v = stdlib.python_version();
+y = ~any(ismissing(v)) & ~isempty(v);
 
 py_enable = y;
+
 end

+stdlib/perl_exe.m

@@ -12,7 +12,7 @@
 
 ps = [fileparts(mfilename('fullpath')), '/private/executable.pl'];
 
-exe = '';
+exe = missing;
 
 try
   [r, s] = perl(ps);
@@ -29,5 +29,3 @@
 end
 
 end
-
-%!assert (isfile(stdlib.perl_exe()))

+stdlib/perl_version.m

@@ -16,11 +16,11 @@
   return
 end
 
-v = [];
+v = missing;
 
 exe = stdlib.perl_exe();
 
-if ~stdlib.strempty(exe)
+if ~ismissing(exe)
   cmd = sprintf('"%s" -e %s', exe, stdlib.perl.perl2cmd('print $^V'));
 
   [s, r] = system(cmd);
@@ -35,5 +35,3 @@
 perlv_cached = true;
 
 end
-
-%!assert (~isempty(stdlib.perl_version()))

+stdlib/private/pvt_python_version.m

@@ -1,6 +1,6 @@
 function v = pvt_python_version()
 
-v = [];
+v = missing;
 
 pe = pyenv();
 % e.g. bad lexical cast: source type value could not be interpreted as target

+stdlib/python_home.m

@@ -6,7 +6,7 @@
   pe = pyenv();
   h = pe.Home;
 catch
-  h = string.empty;
+  h = missing;
 end
 
 end