38 lines
1 KiB
Nix
38 lines
1 KiB
Nix
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# This example implements an aspect "routing" pattern.
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#
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# Unlike `den.default` which is `parametric.atLeast`
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# we use `parametric.fixedTo` here, which help us
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# propagate an already computed context to all includes.
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#
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# This aspect, when installed in a `parametric.atLeast`
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# will just forward the same context.
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# The `mutual` helper returns an static configuration which
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# is ignored by parametric aspects, thus allowing
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# non-existing aspects to be just ignored.
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#
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# Be sure to read: https://vic.github.io/den/dependencies.html
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# See usage at: defaults.nix, alice.nix, igloo.nix
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#
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{ den, eg, ... }:
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{
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# Usage: `den.default.includes [ eg.routes ]`
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eg.routes =
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let
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inherit (den.lib) parametric;
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# eg, `<user>._.<host>` and `<host>._.<user>`
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mutual = from: to: den.aspects.${from.aspect}._.${to.aspect} or { };
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routes =
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{ host, user, ... }@ctx:
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{
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__functor = parametric.fixedTo ctx;
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includes = [
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(mutual user host)
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(mutual host user)
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];
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};
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in
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routes;
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}
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