feat: refactoring configuration with options to make it more modular

lib/attrs.nix

@@ -1,6 +1,4 @@
-{ lib, ... }:
-
-rec {
+{lib, ...}: {
   # Generate an attribute set from a list.
   #
   #   lib.genAttrs [ "foo" "bar" ] (name: "x_" + name)
@@ -8,7 +6,7 @@ rec {
   listToAttrs = lib.genAttrs;
 
   # Update only the values of the given attribute set.
-  # 
+  #
   #   mapAttrs
   #   (name: value: ("bar-" + value))
   #   { x = "a"; y = "b"; }
@@ -16,7 +14,7 @@ rec {
   mapAttrs = lib.attrsets.mapAttrs;
 
   # Update both the names and values of the given attribute set.
-  # 
+  #
   #   mapAttrs'
   #   (name: value: nameValuePair ("foo_" + name) ("bar-" + value))
   #   { x = "a"; y = "b"; }
@@ -24,6 +22,7 @@ rec {
   mapAttrs' = lib.attrsets.mapAttrs';
 
   # Merge a list of attribute sets into one. smilar to the operator `a // b`, but for a list of attribute sets.
+  # NOTE: the later attribute set overrides the former one!
   #
   #   mergeAttrsList
   #   [ { x = "a"; y = "b"; } { x = "c"; z = "d"; } { g = "e"; } ]
@@ -31,7 +30,7 @@ rec {
   mergeAttrsList = lib.attrsets.mergeAttrsList;
 
   # Generate a string from an attribute set.
-  # 
+  #
   #   attrsets.foldlAttrs
   #   (acc: name: value: acc + "\nexport ${name}=${value}")
   #   "# A shell script"