cafkafk/nixpkgs
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Add a renaming module. This module introduce the rename function to

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fetch definitions of oldest options and to add them inside the new option.

Properties are still valid and will not be affected by the renaming. e.g:

with: rename alias "foo.bar" to "baz.quz"
and with the following module:

{
  foo.bar = (mkOverride 10 {}) 42;
  baz.quz = 21;
}

the result of baz.quz would be 42 because the priority is still working
after the renaming.

svn path=/nixos/trunk/; revision=17484
This commit is contained in:
Nicolas Pierron 2009-09-28 18:26:13 +00:00
parent bd41c01bfe
commit 7568587e88
2 changed files with 42 additions and 0 deletions
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1
modules/module-list.nix
View file

@ -27,6 +27,7 @@
./programs/pwdutils/pwdutils.nix
./programs/ssh.nix
./programs/ssmtp.nix
./rename.nix
./security/consolekit.nix
./security/pam.nix
./security/policykit.nix

41
modules/rename.nix Normal file
View file

@ -0,0 +1,41 @@
{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 "bad renaming");
fromOf = attrByPath (splitString "." from) (abort "IE: renaming error");
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"
) # do not add renaming after this.