lib: init flakes.nix

This commit creates flakes.nix, which is a library containing functions
which relate to interacting with flakes. It also moves related functions
from trivial.nix into it.

lib/default.nix

@@ -11,6 +11,9 @@ let
     callLibs = file: import file { lib = self; };
   in {
 
+    # interacting with flakes
+    flakes = callLibs ./flakes.nix;
+
     # often used, or depending on very little
     trivial = callLibs ./trivial.nix;
     fixedPoints = callLibs ./fixed-points.nix;
@@ -59,12 +62,13 @@ let
     # linux kernel configuration
     kernel = callLibs ./kernel.nix;
 
+    inherit (self.flakes) callLocklessFlake;
     inherit (builtins) add addErrorContext attrNames concatLists
       deepSeq elem elemAt filter genericClosure genList getAttr
       hasAttr head isAttrs isBool isInt isList isString length
       lessThan listToAttrs pathExists readFile replaceStrings seq
       stringLength sub substring tail trace;
-    inherit (self.trivial) id callLocklessFlake const pipe concat or and bitAnd bitOr bitXor
+    inherit (self.trivial) id const pipe concat or and bitAnd bitOr bitXor
       bitNot boolToString mergeAttrs flip mapNullable inNixShell isFloat min max
       importJSON importTOML warn warnIf warnIfNot throwIf throwIfNot checkListOfEnum
       info showWarnings nixpkgsVersion version isInOldestRelease

lib/flakes.nix

@@ -0,0 +1,22 @@
+{ lib }:
+
+rec {
+
+  /* imports a flake.nix without acknowledging its lock file, useful for
+    referencing subflakes from a parent flake. The second argument allows
+    specifying the inputs of this flake.
+
+    Example:
+      callLocklessFlake {
+        path = ./directoryContainingFlake;
+        inputs = { inherit nixpkgs; };
+      }
+  */
+  callLocklessFlake = { path, inputs ? { } }:
+    let
+      self = { outPath = path; } //
+        ((import (path + "/flake.nix")).outputs (inputs // { self = self; }));
+    in
+    self;
+
+}

lib/trivial.nix

@@ -13,22 +13,6 @@ rec {
     # The value to return
     x: x;
 
-  /* imports a flake.nix without acknowledging its lock file, useful for
-     referencing subflakes from a parent flake. The second argument allows
-     specifying the inputs of this flake.
-
-     Example:
-       callLocklessFlake {
-         path = ./directoryContainingFlake;
-         inputs = { inherit nixpkgs; };
-       }
-  */
-  callLocklessFlake = { path, inputs ? {} }: let
-    self = {outPath = path;} //
-    ((import (path + "/flake.nix")).outputs (inputs // {self = self;}));
-  in
-    self;
-
   /* The constant function
 
      Ignores the second argument. If called with only one argument,