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43 lines
982 B
Nix
43 lines
982 B
Nix
{ lib, ... }@flakeArg:
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let
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inherit (builtins)
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deepSeq
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foldl'
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groupBy
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mapAttrs
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;
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inherit (lib.lists) singleton;
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inherit (lib.trivial) flip pipe;
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in
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{
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groupByMult =
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groupers:
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# TODO (maybe) make more efficient by building up grouping function from right
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# from left
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# 0= (x: x) vals
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# 1= groupBy values[0] <0>
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# 2= mapAttrs (_: groupBy values[1]) <1>
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# 3= mapAttrs (_: mapAttrs (_: groupBy values[2])) <2>
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# from right
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# 1= (groupBy values[0])
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# 2= ...
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let
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nul = {
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mapper = x: x;
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result = [ ];
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};
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op =
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{ mapper, result }:
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grouper: {
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mapper = fun: mapAttrs (_: mapper fun);
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result = result ++ singleton (mapper grouper);
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};
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list = map groupBy groupers;
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pipeList = (foldl' op nul list).result;
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in
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# catch errors while building groupers before values are passed through
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deepSeq pipeList (flip pipe pipeList);
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}
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