Palette library integrated + polybar and alacritty

extra/hex/default.nix

@@ -0,0 +1,46 @@
+{ pkgs, lib ? pkgs.lib, ... }:
+let
+  inherit (lib.trivial) toHexString;
+  inherit (lib.strings) match toUpper stringToCharacters;
+  inherit (lib.lists) foldl;
+
+  # Parse a single hexadecimal digit to an integer
+  _parseDigit = c:
+    let
+      v = toUpper c;
+    in
+      assert(match "[0-9A-F]" v != null);
+      {
+        "0" = 0;
+        "1" = 1;
+        "2" = 2;
+        "3" = 3;
+        "4" = 4;
+        "5" = 5;
+        "6" = 6;
+        "7" = 7;
+        "8" = 8;
+        "9" = 9;
+        "A" = 10;
+        "B" = 11;
+        "C" = 12;
+        "D" = 13;
+        "E" = 14;
+        "F" = 15;
+      }."${v}";
+
+in
+rec {
+
+  # Convert an hexadecimal string to an integer
+  toDec = s:
+    let
+      characters = stringToCharacters s;
+      values = map _parseDigit characters;
+    in
+      foldl (acc: n: acc * 16 + n) 0 values;
+
+  # Convert an integer to a decimal string
+  fromDec = toHexString;
+
+}