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author | Nicolas B. Pierron <nicolas.b.pierron@gmail.com> | 2014-12-22 22:38:38 +0100 |
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committer | Nicolas B. Pierron <nicolas.b.pierron@gmail.com> | 2014-12-22 22:38:38 +0100 |
commit | d7f29acd48f27f3ad0aa13b47c489f3d4bfda362 (patch) | |
tree | de869876c1a1112067e34009dd420b3dfad27fe3 /lib/modules.nix | |
parent | 4e558732e7714ad69a6d0ad2b052f2efdde76376 (diff) | |
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modules: Extract mkAliasDefinition from the rename.nix NixOS module.
Diffstat (limited to 'lib/modules.nix')
-rw-r--r-- | lib/modules.nix | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/lib/modules.nix b/lib/modules.nix index fdee8824493..d0b8f90e5ce 100644 --- a/lib/modules.nix +++ b/lib/modules.nix @@ -356,6 +356,31 @@ rec { mkBefore = mkOrder 500; mkAfter = mkOrder 1500; + # Convenient property used to transfer all definitions and their + # properties from one option to another. This property is useful for + # renaming options, and also for including properties from another module + # system, including sub-modules. + # + # { config, options, ... }: + # + # { + # # 'bar' might not always be defined in the current module-set. + # config.foo.enable = mkAliasDefinitions (options.bar.enable or {}); + # + # # 'barbaz' has to be defined in the current module-set. + # config.foobar.paths = mkAliasDefinitions options.barbaz.paths; + # } + # + # Note, this is different than taking the value of the option and using it + # as a definition, as the new definition will not keep the mkOverride / + # mkDefault properties of the previous option. + # + mkAliasDefinitions = mkAliasAndWrapDefinitions id; + mkAliasAndWrapDefinitions = wrap: option: + mkMerge + (optional (isOption option && option.isDefined) + (wrap (mkMerge option.definitions))); + /* Compatibility. */ fixMergeModules = modules: args: evalModules { inherit modules args; check = false; }; |