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https://github.com/NixOS/nixpkgs.git
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62c1f0ddcc
sets that match the hierarchical structure of the options. So
instead of
{
name = ["time" "timeZone"];
default = "CET";
example = "America/New_York";
description = "The time zone used when displaying times and dates.";
}
we have
time = {
timeZone = {
default = "CET";
example = "America/New_York";
description = "The time zone used when displaying times and dates.";
};
};
And instead of `config.get ["time" "timeZone"]' you can now just say
`config.time.timeZone'. Furthermore, this option representation
will allow option structures with repetition (such as in
networking.interfaces or services.httpd.subservices) to be defined.
svn path=/nixos/trunk/; revision=9618
41 lines
1.3 KiB
Nix
41 lines
1.3 KiB
Nix
# Given a configuration, this function returns an object with a `get'
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# method for retrieving the values of options, falling back to the
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# defaults declared in options.nix if no value is given for an
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# option.
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pkgs: config:
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let
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lib = pkgs.library;
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# The option declarations, i.e., option names with defaults and
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# documentation.
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declarations = import ./options.nix {inherit pkgs; inherit (lib) mkOption;};
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configFilled = lib.addDefaultOptionValues declarations config;
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# Get the option named `name' from the user configuration, using
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# its default value if it's not defined.
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get = name:
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/*
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let
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decl =
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lib.findSingle (decl: lib.eqLists decl.name name)
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(abort ("Undeclared option `" + printName name + "'."))
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(abort ("Multiple declarations for option `" + printName name + "'."))
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declarations;
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default =
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if !decl ? default
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then abort ("Option `" + printName name + "' has no default.")
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else decl.default;
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in lib.getAttr name default config;
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*/
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let
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default = abort ("Undeclared option `" + printName name + "'.");
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in lib.getAttr name default configFilled;
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printName = name: lib.concatStrings (lib.intersperse "." name);
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in configFilled // {inherit get;}
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