chore: initial commit

lib/utils/accumulate.nix

@@ -0,0 +1,56 @@
+{l}: let
+  unique =
+    l.foldl' (
+      acc: e:
+        if l.elem e.name acc.visited
+        then acc
+        else {
+          visited = acc.visited ++ [e.name];
+          result = acc.result ++ [e];
+        }
+    ) {
+      visited = [];
+      result = [];
+    };
+
+  accumulate =
+    l.foldl' (
+      acc: new: let
+        first = l.head new;
+        cdr = l.tail new;
+        second = l.head cdr;
+        cdr' = l.tail cdr;
+        third = l.head cdr';
+      in
+        (
+          if first == null
+          then {inherit (acc) output;}
+          else {output = acc.output // first;}
+        )
+        // (
+          if second == null
+          then {inherit (acc) actions;}
+          else {actions = acc.actions // second;}
+        )
+        // (
+          if third == null
+          then {inherit (acc) init;}
+          else {init = acc.init ++ [third];}
+        )
+    ) {
+      output = {};
+      actions = {};
+      init = [];
+    };
+
+  optionalLoad = cond: elem:
+    if cond
+    then elem
+    else [
+      null # empty output
+      null # empty action
+      null # empty init
+    ];
+in {
+  inherit unique accumulate optionalLoad;
+}