nixpkgs/modules/rename.nix

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{pkgs, options, config, ...}:
let
to = throw "This is just a dummy keyword";
alias = { name = "Alias"; };
obsolete = { name = "Obsolete name"; };
zipModules = list: with pkgs.lib;
zip (n: v:
if tail v != [] then zipModules v else head v
) list;
rename = fromStatus: from: keyword: to: with pkgs.lib;
let
setTo = setAttrByPath (splitString "." to);
setFrom = setAttrByPath (splitString "." from);
toOf = attrByPath (splitString "." to)
(abort "Renaming Error: option '${to}' does not exists.");
fromOf = attrByPath (splitString "." from)
(abort "Internal Error: option '${from}' should be declared.");
in
[{
options = setFrom (mkOption {
description = "${fromStatus.name} of <option>${to}</option>.";
apply = x: toOf config;
});
}] ++
[{
options = setTo (mkOption {
extraConfigs = map (def: def.value) (fromOf options).definitions;
});
}];
in zipModules ([]
# usage example:
# ++ rename alias "services.xserver.slim.theme" to "services.xserver.displayManager.slim.theme"
++ rename obsolete "environment.extraPackages" to "environment.systemPackages"
# Old Grub-related options.
++ rename obsolete "boot.copyKernels" to "boot.loader.grub.copyKernels"
++ rename obsolete "boot.extraGrubEntries" to "boot.loader.grub.extraEntries"
++ rename obsolete "boot.extraGrubEntriesBeforeNixos" to "boot.loader.grub.extraEntriesBeforeNixOS"
++ rename obsolete "boot.grubDevice" to "boot.loader.grub.device"
++ rename obsolete "boot.bootMount" to "boot.loader.grub.bootDevice"
) # do not add renaming after this.