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lib.toHexString: Statically compute hexDigits attrset

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This commit is contained in:
adisbladis 2023-12-11 16:36:03 +13:00
parent eec92ca9df
commit ad647985cf
1 changed files with 14 additions and 16 deletions
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30
lib/trivial.nix
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@ -510,22 +510,20 @@ rec {
toHexString 250 => "FA"
*/
toHexString = i:
let
toHexDigit = d:
if d < 10
then toString d
else
{
"10" = "A";
"11" = "B";
"12" = "C";
"13" = "D";
"14" = "E";
"15" = "F";
}.${toString d};
in
lib.concatMapStrings toHexDigit (toBaseDigits 16 i);
toHexString = let
hexDigits = {
"10" = "A";
"11" = "B";
"12" = "C";
"13" = "D";
"14" = "E";
"15" = "F";
};
toHexDigit = d:
if d < 10
then toString d
else hexDigits.${toString d};
in i: lib.concatMapStrings toHexDigit (toBaseDigits 16 i);
/* `toBaseDigits base i` converts the positive integer i to a list of its
digits in the given base. For example: