19 lines
474 B
Nix
19 lines
474 B
Nix
{ lib }:
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let
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chrs = lib.listToAttrs (lib.imap (i: v: { name = v; value = i + 96; }) lib.lowerChars);
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ord = c: builtins.getAttr c chrs;
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in
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{
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# Make a unique UID from a 4-char identifier
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mkUid = id: let
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# TODO: Assert length
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chars = lib.stringToCharacters id;
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n = builtins.map (c: lib.mod (ord c) 10) chars;
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s = builtins.concatStringsSep "" (builtins.map (i: builtins.toString i) n);
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in
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assert lib.length chars == 4;
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1000 + lib.toInt s;
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}
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