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25 lines
747 B
Nix
25 lines
747 B
Nix
{ lib }: rec {
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hexChars =
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[ "0" "1" "2" "3" "4" "5" "6" "7" "8" "9" "a" "b" "c" "d" "e" "f" ];
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hexCharToInt = char:
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let
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pairs = lib.imap0 (lib.flip lib.nameValuePair) hexChars;
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idx = builtins.listToAttrs pairs;
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in
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idx.${lib.toLower char};
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hexToInt = str:
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lib.foldl (value: chr: value * 16 + hexCharToInt chr) 0
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(lib.stringToCharacters str);
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hextorgba = hex: alpha:
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(
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let
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r_hex = lib.substring 1 2 hex;
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g_hex = lib.substring 3 2 hex;
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b_hex = lib.substring 5 2 hex;
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r_dec = hexToInt r_hex;
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g_dec = hexToInt g_hex;
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b_dec = hexToInt b_hex;
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in
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"rgba(${toString r_dec}, ${toString g_dec}, ${toString b_dec}, ${toString alpha})"
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);
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}
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