update caelestia and its theming

1 files changed, 66 insertions, 0 deletions

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;
+}