Initial commit

flake/den/nix/lib.nix

@@ -0,0 +1,101 @@
+{
+  inputs,
+  lib,
+  config,
+  ...
+}:
+let
+
+  # "Just Give 'Em One of These" -  Moe Szyslak
+  # A __functor that applies context to parametric includes (functions)
+  funk =
+    apply: aspect:
+    aspect
+    // {
+      __functor = self: ctx: {
+        includes = builtins.filter (x: x != { }) (map (apply ctx) (builtins.filter isFn self.includes));
+      };
+    };
+
+  isFn = f: (builtins.isFunction f) || (f ? __functor);
+  canTake = import ./fn-can-take.nix lib;
+
+  # creates an aspect that inherits class from fromAspect.
+  owned =
+    aspect:
+    aspect
+    // {
+      includes = [ ];
+      __functor =
+        self:
+        # deadnix: skip
+        { class, aspect-chain }:
+        self;
+    };
+
+  # only static includes from an aspect.
+  statics =
+    aspect:
+    aspect
+    // {
+      __functor =
+        self:
+        # deadnix: skip
+        { class, aspect-chain }@ctx:
+        funk applyStatics self ctx;
+    };
+
+  applyStatics =
+    ctx: f:
+    if isStatic f then
+      f ctx
+    else if !isFn f then
+      f
+    else
+      { };
+
+  isStatic = canTake {
+    class = "";
+    aspect-chain = [ ];
+  };
+
+  take.unused = _unused: used: used;
+  take.exactly = take canTake.exactly;
+  take.atLeast = take canTake.atLeast;
+  take.__functor =
+    _: takes: fn: ctx:
+    if takes ctx fn then fn ctx else { };
+
+  parametric.atLeast = funk (lib.flip take.atLeast);
+  parametric.exactly = funk (lib.flip take.exactly);
+  parametric.fixedTo = lib.flip parametric.atLeast;
+  parametric.expands = attrs: funk (ctx: (lib.flip take.atLeast) (ctx // attrs));
+  parametric.__functor =
+    self: ctx:
+    if ctx == true then
+      self.atLeast
+    else if ctx == false then
+      self.exactly
+    else if isFn ctx then
+      funk ctx
+    else
+      self.fixedTo ctx;
+
+  aspects = inputs.flake-aspects.lib lib;
+
+  __findFile = import ./den-brackets.nix { inherit lib config; };
+
+  den-lib = {
+    inherit
+      parametric
+      aspects
+      __findFile
+      statics
+      owned
+      isFn
+      canTake
+      take
+      ;
+  };
+in
+den-lib