40 lines
1.2 KiB
Nix
40 lines
1.2 KiB
Nix
final: prev:
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let lib = final;
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in with lib; {
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generators = with final.generators;
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prev.generators // {
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# Generates Preserves from an arbitrary value.
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# Records are generated for functions that take
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# a single formal argument `toRecord` and return
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# a list of values.
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toPreserves = { }@args:
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let
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toPreserves' = toPreserves args;
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concatItems = toString;
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in v:
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if isAttrs v then
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"{ ${
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concatItems (lib.attrsets.mapAttrsToList
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(key: val: "${key}: ${toPreserves' val}") v)
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} }"
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else if isList v then
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"[ ${concatItems (map toPreserves' v)} ]"
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else if isBool v then
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(if v then "#t" else "#f")
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else if isFunction v then
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(if (lib.functionArgs v) == { toRecord = false; } then
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let items = v { toRecord = null; };
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in "<${head items} ${toString (map toPreserves' (tail items))}>"
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else
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abort
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"generators.toPreserves: cannot convert a function to Preserves")
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else if isNull v then
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"null"
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else
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builtins.toJSON v;
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};
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}
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