mc: add trivial updater script

pkgs/tools/misc/mc/default.nix

@@ -17,6 +17,9 @@
 , coreutils
 , autoreconfHook
 , autoSignDarwinBinariesHook
+
+# updater only
+, writeScript
 }:
 
 stdenv.mkDerivation rec {
@@ -69,6 +72,17 @@ stdenv.mkDerivation rec {
       $out/bin/mc
   '';
 
+  passthru.updateScript = writeScript "update-mc" ''
+   #!/usr/bin/env nix-shell
+   #!nix-shell -i bash -p curl pcre common-updater-scripts
+
+   set -eu -o pipefail
+
+   # Expect the text in format of "Current version is: 4.8.27; ...".
+   new_version="$(curl -s https://midnight-commander.org/ | pcregrep -o1 'Current version is: (([0-9]+\.?)+);')"
+   update-source-version mc "$new_version"
+ '';
+
   meta = with lib; {
     description = "File Manager and User Shell for the GNU Project";
     downloadPage = "https://www.midnight-commander.org/downloads/";