nixpkgs/modules/rename.nix

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{pkgs, options, config, ...}:
let
to = throw "This is just a dummy keyword";
alias = from: to: {
name = "Alias";
msg.use = x: x;
msg.define = x: x;
};
obsolete = from: to: {
name = "Obsolete name";
msg.use = x:
builtins.trace "Option '${from}' is used instead of '${to}'." x;
msg.define = x:
builtins.trace "Option '${from}' is defined instead of '${to}'." x;
};
deprecated = from: to: {
name = "Deprecated name";
msg.use = x:
abort "Option '${from}' is used instead of '${to}'.";
msg.define = x:
abort "Option '${from}' is defined instead of '${to}'.";
};
zipModules = list: with pkgs.lib;
zip (n: v:
if tail v != [] then zipModules v else head v
) list;
rename = statusTemplate: from: keyword: to: with pkgs.lib;
let
status = statusTemplate from to;
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 = "${status.name} of <option>${to}</option>.";
apply = x: status.msg.use (toOf config);
});
}] ++
[{
options = setTo (mkOption {
extraConfigs =
let externalDefs = (fromOf options).definitions; in
if externalDefs == [] then []
else map (def: def.value) (status.msg.define externalDefs);
});
}];
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"
++ rename obsolete "boot.grubSplashImage" to "boot.loader.grub.splashImage"
) # do not add renaming after this.