0e333688ce
The major changes are:
* The evaluation is now driven by the declared options. In
particular, this fixes the long-standing problem with lack of
laziness of disabled option definitions. Thus, a configuration like
config = mkIf false {
environment.systemPackages = throw "bla";
};
will now evaluate without throwing an error. This also improves
performance since we're not evaluating unused option definitions.
* The implementation of properties is greatly simplified.
* There is a new type constructor "submodule" that replaces
"optionSet". Unlike "optionSet", "submodule" gets its option
declarations as an argument, making it more like "listOf" and other
type constructors. A typical use is:
foo = mkOption {
type = type.attrsOf (type.submodule (
{ config, ... }:
{ bar = mkOption { ... };
xyzzy = mkOption { ... };
}));
};
Existing uses of "optionSet" are automatically mapped to
"submodule".
* Modules are now checked for unsupported attributes: you get an error
if a module contains an attribute other than "config", "options" or
"imports".
* The new implementation is faster and uses much less memory.
33 lines
1.1 KiB
Nix
33 lines
1.1 KiB
Nix
let
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trivial = import ./trivial.nix;
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lists = import ./lists.nix;
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strings = import ./strings.nix;
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stringsWithDeps = import ./strings-with-deps.nix;
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attrsets = import ./attrsets.nix;
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sources = import ./sources.nix;
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modules = import ./modules.nix;
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options = import ./options.nix;
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types = import ./types.nix;
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meta = import ./meta.nix;
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debug = import ./debug.nix;
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misc = import ./misc.nix;
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maintainers = import ./maintainers.nix;
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platforms = import ./platforms.nix;
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systems = import ./systems.nix;
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customisation = import ./customisation.nix;
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licenses = import ./licenses.nix;
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in
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{ inherit trivial lists strings stringsWithDeps attrsets sources options
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modules types meta debug maintainers licenses platforms systems;
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# Pull in some builtins not included elsewhere.
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inherit (builtins) pathExists readFile;
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}
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# !!! don't include everything at top-level; perhaps only the most
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# commonly used functions.
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// trivial // lists // strings // stringsWithDeps // attrsets // sources
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// options // types // meta // debug // misc // modules
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// systems
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// customisation
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