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feat: apply dag defaults

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This commit is contained in:
Jake Hamilton 2024-06-17 03:59:11 -07:00
parent 69a8760bd3
commit dc2ce818b8
Signed by: jakehamilton
GPG key ID: 9762169A1B35EA68
1 changed files with 28 additions and 1 deletions
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29
lib/src/dag/default.nix
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@ -59,7 +59,34 @@ lib: {
};
apply = {
# defaults = graph: defaults:
## Apply a set of defaults to a graph. This will ensure that missing entries are added
## and any entries that do exist are given the appropriate `before` and `after` values.
##
## @type Dag a -> Dag a -> Dag a
defaults = graph: defaults: let
result =
builtins.mapAttrs
(
name: entry:
if defaults ? ${name}
then
if builtins.isString entry
then {
value = entry;
before = defaults.${name}.before or [];
after = defaults.${name}.after or [];
}
else
entry
// {
before = (entry.before or []) ++ (defaults.${name}.before or []);
after = (entry.after or []) ++ (defaults.${name}.after or []);
}
else entry
)
graph;
in
defaults // result;
};
## Map over the entries in a DAG and modify their values.