nxricelib

nxlib/ricelib.nix

@@ -0,0 +1,64 @@
+{ lib, ... }:
+rec
+{
+  nohash = s: builtins.substring 1 7 s;
+
+  slice-hex = hex: { r = builtins.substring 0 2 hex; g = builtins.substring 2 2 hex; b = builtins.substring 4 5 hex; };
+
+  # https://github.com/bertof/nix-rice
+  rune-to-num = c:
+    let
+      k = lib.strings.toUpper c;
+      dict = {
+        "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
+    assert(builtins.hasAttr k dict);
+    builtins.getAttr k dict;
+
+  drune-to-255 = hex: (rune-to-num (builtins.substring 0 1 hex)) * 15 + (rune-to-num (builtins.substring 1 2 hex));
+
+  hex-to-rgb-comma-string = hex: let color = (slice-hex (nohash hex)); in "${builtins.toString (drune-to-255 color.r)},${builtins.toString (drune-to-255 color.g)},${builtins.toString (drune-to-255 color.b)}";
+
+  num-to-rune = n:
+    let
+      ns = builtins.toString n;
+      dict = {
+        "0" = "0";
+        "1" = "1";
+        "2" = "2";
+        "3" = "3";
+        "4" = "4";
+        "5" = "5";
+        "6" = "6";
+        "7" = "7";
+        "8" = "8";
+        "9" = "9";
+        "10" = "A";
+        "11" = "B";
+        "12" = "C";
+        "13" = "D";
+        "14" = "E";
+        "15" = "F";
+      };
+    in
+    assert(builtins.hasAttr ns dict);
+    builtins.getAttr ns dict;
+
+  float-to-drune = f: "${num-to-rune (builtins.floor((255*f) / 16))}${num-to-rune (builtins.floor(255*f) - (builtins.floor((255 * f) / 16) * 16))}";
+}