From 25b4f61512a76d75aa94b44bb666fd899cf8bf5e Mon Sep 17 00:00:00 2001
From: Freya Murphy <freya@freyacat.org>
Date: Mon, 16 Mar 2026 23:46:49 -0400
Subject: update caelestia and its theming

---
 lib/colors.nix  | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/default.nix |  2 ++
 2 files changed, 68 insertions(+)
 create mode 100644 lib/colors.nix

(limited to 'lib')

diff --git a/lib/colors.nix b/lib/colors.nix
new file mode 100644
index 0000000..a653f11
--- /dev/null
+++ b/lib/colors.nix
@@ -0,0 +1,66 @@
+{lib, ...}: let
+  colorToInt = hex: let
+    table = {
+      "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;
+    };
+  in
+    builtins.foldl'
+    (acc: c: acc * 16 + table.${c})
+    0
+    (lib.strings.stringToCharacters (lib.strings.toLower hex));
+
+  colorToHex = n: let
+    hexChars = "0123456789abcdef";
+    hi = builtins.div n 16;
+    lo = lib.trivial.mod n 16;
+  in
+    builtins.substring hi 1 hexChars
+    + builtins.substring lo 1 hexChars;
+
+  mapColor = f: hex: let
+    r = colorToInt (builtins.substring 0 2 hex);
+    g = colorToInt (builtins.substring 2 2 hex);
+    b = colorToInt (builtins.substring 4 2 hex);
+  in
+    colorToHex (f r)
+    + colorToHex (f g)
+    + colorToHex (f b);
+
+  darkenColor = factor: hex:
+    mapColor (c: builtins.floor (c * (1 - factor))) hex;
+
+  lightenColor = factor: hex:
+    mapColor (c: builtins.floor (c + (255 - c) * factor)) hex;
+
+  mixColor = factor: hex1: hex2: let
+    r1 = colorToInt (builtins.substring 0 2 hex1);
+    g1 = colorToInt (builtins.substring 2 2 hex1);
+    b1 = colorToInt (builtins.substring 4 2 hex1);
+    r2 = colorToInt (builtins.substring 0 2 hex2);
+    g2 = colorToInt (builtins.substring 2 2 hex2);
+    b2 = colorToInt (builtins.substring 4 2 hex2);
+    r = builtins.floor (r1 * factor) + builtins.floor (r2 * (1 - factor));
+    g = builtins.floor (g1 * factor) + builtins.floor (g2 * (1 - factor));
+    b = builtins.floor (b1 * factor) + builtins.floor (b2 * (1 - factor));
+  in
+    colorToHex r
+    + colorToHex g
+    + colorToHex b;
+in {
+  inherit colorToInt colorToHex darkenColor lightenColor mixColor;
+}
diff --git a/lib/default.nix b/lib/default.nix
index b501184..21031c8 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -1,8 +1,10 @@
 {lib, ...} @ inputs: let
   callLibs = file: import file inputs;
   files = callLibs ./files.nix;
+  colors = callLibs ./colors.nix;
 in {
   inherit (files) getFiles certs sshKeys gpgKeys;
+  inherit (colors) colorToInt colorToHex darkenColor lightenColor mixColor;
 
   # set of options we want to copy from a system
   # config to home manager
-- 
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