cinnamon.nemo-emblems: init at 5.6.0

Similar to folder-color-switcher, it sounds like we don't need to
patch nemo-emblems.py in any way thanks to how nemo-python works.

pkgs/desktops/cinnamon/default.nix

···
   });
 
   # Extensions added here will be shipped by default
+  # We keep this in sync with a default Mint installation
+  # Right now (only) nemo-share is missing
   nemoExtensions = [
     folder-color-switcher
+    nemo-emblems
     nemo-fileroller
     nemo-python
   ];
···
   cjs = callPackage ./cjs { };
   folder-color-switcher = callPackage ./folder-color-switcher { };
   nemo = callPackage ./nemo { };
+  nemo-emblems = callPackage ./nemo-extensions/nemo-emblems { };
   nemo-fileroller = callPackage ./nemo-extensions/nemo-fileroller { };
   nemo-python = callPackage ./nemo-extensions/nemo-python { };
   nemo-with-extensions = callPackage ./nemo/wrapper.nix { };

pkgs/desktops/cinnamon/nemo-extensions/nemo-emblems/default.nix

···
+{ python3
+, lib
+, fetchFromGitHub
+}:
+
+python3.pkgs.buildPythonApplication rec {
+  pname = "nemo-emblems";
+  version = "5.6.0";
+
+  format = "setuptools";
+
+  src = fetchFromGitHub {
+    owner = "linuxmint";
+    repo = "nemo-extensions";
+    rev = version;
+    sha256 = "sha256-cxutiz5bc/dZ9D7XzvMWodWNYvNJPj+5IhJDPJwnb5I=";
+  };
+
+  sourceRoot = "${src.name}/nemo-emblems";
+
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace "/usr/share" "share"
+  '';
+
+  meta = with lib; {
+    homepage = "https://github.com/linuxmint/nemo-extensions/tree/master/nemo-emblems";
+    description = "Change a folder or file emblem in Nemo";
+    longDescription = ''
+      Nemo extension that allows you to change folder or file emblems.
+      When adding this to nemo-with-extensions you also need to add nemo-python.
+    '';
+    license = licenses.gpl3Only;
+    platforms = platforms.linux;
+    maintainers = teams.cinnamon.members;
+  };
+}