Added a generator for the KDL document language.
This is in order for home-manager to natively generate
the new config format for zellij, as described in nix-community#3364.
There is not a one to one mapping between KDL and nix types,
but attrset translation is heavily based on KDLs JSON-IN-KDL microsyntax.
The exception here is the `_args` and `_props` arguments, which lets you
specify arguments and properties as described in the spec.
See more here:
- https://kdl.dev/
- https://github.com/kdl-org/kdl/blob/main/SPEC.md
The generator also conforms to the interface from the nixpkgs manual:
https://nixos.org/manual/nixpkgs/stable/#sec-generators
Co-authored-by: Gaetan Lepage <gaetan@glepage.com>
Removes the `uniq` constraint on `after` and `before` so that we can
merge multiple definitions for the same DAG entry:
{
dag = mkMerge [
{
foo = lib.hm.dag.entryBefore [ "bar" ] {
# definition 1
};
}
{
foo = lib.hm.dag.entryBefore [ "qux" ] {
# definition 2
};
}
{
foo = {
# definition 3
};
}
];
}
In this example `foo` will come before `bar` and `qux`.
This makes definitions like
home.activation.foo = mkIf false "bar"
work, where previously they would complain about
`home.activation.foobar.data` being used but not defined.
The crucial part is that we don't call `convertAllToDags` in
`dagOf.merge`, because we need to process `mkIf`/`mkMerge` properties
first. So we let `attrEquivalent.merge` do its job normally, but give
it a type `dagEntryOf` that does the conversion.
Ideally this shouldn't require so much boilerplate; I'd like to
implement something like
types.changeInto dagContentType elemType dagEntryAnywhere
in Nixpkgs.
Given an inner type, the former function generates a type that expect
DAG option values. The latter function is only present to temporarily
allow the `programs.ssh.matchBlocks` to keep accepting list values.
