Previously null was used when a value could not be loaded. This
prevented setting a value to null using a nixDir auto-load.
This change removes the use of null as a special value when loading from
nixDir, allowing it to be used as a normal value.
This removes the manual configuration of which options are auto-loaded.
Now all options are eligible except for "nixDir" and "_module" as those
would cause inf recursions.
Additionally, instead of setting name aliases in the nixDir module, a
config option is added, enabling other modules to extend the aliases
lists.
The mock pkgs set passed `{}` as the value for unknown args; if a
package def tried to evaluate one, this can raise an error that can't be
caught. Replacing the default value with `throw ""` enables bailing out
if one of the fake args is accessed.
Many attributes can take moduleArgs when auto-loaded in order to
facilitate access to them from other files. Those same attributes could
not take moduleArgs when included directly, which was inconsistent.
With this change, all attributes that could take moduleArgs when
auto-loaded can now always do so. Auto-loading no longer needs special
cases.
This edge case was inconsistent between setting outputs directly and
auto-loading. Setting directly did not support args, so just merged
sets, thus resulting in a __functor flake output. When autoloading, a
set with a __functor attr was treated as a function and passed module
args.
To correct this inconsistency, outputs now always supports taking args,
and has the autoloading behavior.
Code that relied on previous behavior is easy to fix, as the value needs
to be converted to a function, which can then return the set with
__functor.
optFunctionTo results in a function which needs to be called when using
the option value. This is needed when the argument is not known when
building types (such as with pkgs). When the args are known (for
example, moduleArgs), this leads to more complex code than just calling
the function and resulting in the target type. optCallWith does the
latter.
Previously, devShell was inconsistent when setting it to a function.
When setting directly, a function was assumed to be a package definition
and was used to set devShells.default directly. When auto-loading, a
function was assumed to take module args, and result in config (not a
derivation).
This now enables both behaviors in either case by detecting if a
function is a package definition or if it expects module args and
handling it accordingly.
Instead of having to call the configuration generation functions, the
params can just be set, and the functions will be called automatically
with additional useful settings automatically set.
The `propagationModule` config option provides a module that can be used
to propagate flakelight configuration into other module systems such as
NixOS or home-manager.
Previously, the packages outputs would be evalutated using callPackage
on the package set, but the package set already contains the package. If
another package depends on it, the dependency would be the version from
the package set. By grabbing the packages from the package set, each
package only needs to be evaluated once.
Since evaluating pkgs is expensive, this speeds up evaluation of flakes
with `packages.default` by attempting to get the name using a pkgs set
containing only mocked builders that just return the name.
In order to speed up evalutation of flakes setting `packages.default`,
this trys to compute the pname in multiple ways, ordered by speed. The
pname can be set manually, which is fastest. To avoid computing a new
nixpkgs and flakelight overlays, the second option just uses callPackage
from stock nixpkgs. If that fails, the prior, most accurate, method is
used which creates a new nixpkgs with all the overlays available.
Using `perSystem` to implement per-system attributes ties all the
per-system attributes together; all the `perSystem` functions must run
to determine output attrs. By generating them separately, the generation
can be done lazily.
The set of args passed to modules is useful for more than just
autoloading. This renames it appropriately and makes it available
through pkgs arguments as well.
The formatter uses `devShell.packages` for its path which is not
available when devShell is null. A default value of empty list should be
used when devShell is null.
Using a submodule for devShell removes the need to make every option
nullable and the need to check all of them. By using nullOr submodule,
we can tell if the value has been set and have default values for
options.
This also enables enabling a devShell with no options set.
NixOS build checks significantly slowed down `nix flake show` as it
prints out the derivation names, which for NixOS derivations requires a
large amount of evaluation. By wrapping the derivations, we now give
them trivial names. The NixOS configurations are still built when
running checks as they are a dependency of the wrappers.
