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nixpkgs/pkgs/test/mkOption/declare.nix
Nicolas Pierron 0e25bb67cf Add a new way to handle option sets.
svn path=/nixpkgs/trunk/; revision=12505
2008-08-05 17:16:35 +00:00

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1.2 KiB
Nix

# sets of small configurations:
# Each configuration
rec {
# has 2 arguments pkgs and this.
configA = pkgs: this: {
# Can depends on other configuration
require = configB;
# Defines new options
optionA = pkgs.lib.mkOption {
# With default values
default = false;
# And merging functions.
merge = pkgs.lib.mergeEnableOption;
};
# Add a new definition to other options.
optionB = this.optionA;
};
# Can be used for option header.
configB = pkgs: this: {
# Can depends on more than one configuration.
require = [ configC configD ];
optionB = pkgs.lib.mkOption {
default = false;
};
# Is not obliged to define other options.
};
configC = pkgs: this: {
require = [ configA ];
optionC = pkgs.lib.mkOption {
default = false;
};
# Use the default value if it is not overwritten.
optionA = this.optionC;
};
# Can also be used as option configuration only.
# without any arguments (backward compatibility)
configD = {
# Is not forced to specify the require attribute.
# Is not force to make new options.
optionA = true;
optionD = false;
};
}