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* More refactoring.

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svn path=/nixos/trunk/; revision=7314
This commit is contained in:
Eelco Dolstra 2006-12-11 15:42:02 +00:00
parent 16a9702c4a
commit ce29e4efc7
2 changed files with 34 additions and 30 deletions
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35
configuration/boot-environment.nix
View file

@ -202,38 +202,13 @@ rec {
};
lib = pkgs.library;
config = import ./config.nix pkgs.library configData;
config = rec {
# The user configuration.
config = {
networking = {
hostname = "nixos";
};
# The user configuration.
configData = {
networking = {
hostname = "nixos";
};
# The option declarations, i.e., option names with defaults and
# documentation.
declarations = import ./options.nix;
# Get the option named `name' from the user configuration, using
# its default value if it's not defined.
get = name:
let
sameName = lib.filter (opt: lib.eqLists opt.name name) declarations;
default =
if sameName == []
then abort ("Undeclared option `" + printName name + "'.")
else if !builtins.head sameName ? default
then abort ("Option `" + printName name + "' has no default.")
else (builtins.head sameName).default;
in lib.getAttr name default config;
printName = name: lib.concatStrings (lib.intersperse "." name);
};
}

29
configuration/config.nix Normal file
View file

@ -0,0 +1,29 @@
# Given a configuration, this function returns an object with a `get'
# method for retrieving the values of options, falling back to the
# defaults declared in options.nix if no value is given for an
# option.
lib: config:
rec {
# The option declarations, i.e., option names with defaults and
# documentation.
declarations = import ./options.nix;
# Get the option named `name' from the user configuration, using
# its default value if it's not defined.
get = name:
let
sameName = lib.filter (opt: lib.eqLists opt.name name) declarations;
default =
if sameName == []
then abort ("Undeclared option `" + printName name + "'.")
else if !builtins.head sameName ? default
then abort ("Option `" + printName name + "' has no default.")
else (builtins.head sameName).default;
in lib.getAttr name default config;
printName = name: lib.concatStrings (lib.intersperse "." name);
}