read_symlink: enable .net fallback

Author: scivision

+stdlib/read_symlink.m

@@ -8,6 +8,7 @@
   p {mustBeTextScalar}
 end
 
+r = string.empty;
 
 try
   [ok, r] = isSymbolicLink(p);
@@ -16,15 +17,16 @@
   switch e.identifier
     case "Octave:undefined-function", r = readlink(p);
     case "MATLAB:UndefinedFunction"
-      if stdlib.is_symlink(p)
+      if ~stdlib.is_symlink(p), return, end
+
+      if stdlib.has_dotnet() && stdlib.dotnet_api() >= 6
+        r = System.IO.FileInfo(p).LinkTarget;
+      elseif stdlib.has_java()
         % must be absolute path
         % must not be .canonical or symlink is gobbled!
         r = stdlib.absolute(p);
-
         % https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/nio/file/Files.html#readSymbolicLink(java.nio.file.Path)
         r = java.nio.file.Files.readSymbolicLink(javaPathObject(r)).string;
-      else
-        r = string.empty;
       end
     otherwise, rethrow(e)
   end

buildfile.m

@@ -258,13 +258,11 @@ function build_exe(context)
 win = [pure, "src/windows.cpp"];
 
 mac = "src/macos.cpp";
-linux = "src/linux_fs.cpp";
 
 sym = "src/symlink_fs.cpp";
 
 
 srcs = {
-"src/is_absolute.cpp", ...
 "src/remove.cpp", ...
 ["src/is_admin.cpp", "src/admin_fs.cpp"] ...
 "src/is_char_device.cpp", ...
@@ -273,14 +271,16 @@ function build_exe(context)
 "src/proximate_to.cpp", ...
 "src/disk_available.cpp", ...
 "src/disk_capacity.cpp", ...
-["src/is_wsl.cpp", linux], ...
 "src/set_permissions.cpp", ...
 ["src/is_rosetta.cpp", mac], ...
 ["src/drop_slash.cpp", normal], ...
 };
 
-if isMATLABReleaseOlderThan("R2024b") || build_all
+if (isMATLABReleaseOlderThan("R2024b") && ~stdlib.has_dotnet()) || build_all
 srcs{end+1} = ["src/is_symlink.cpp", win, sym];
+end
+
+if (isMATLABReleaseOlderThan("R2024b") && ~stdlib.has_dotnet() || stdlib.dotnet_api() < 6) || build_all
 srcs{end+1} = ["src/read_symlink.cpp", win, sym];
 end