| 29 May 2026 |
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 hsjobeki | docs say it's equivalent. https://noogle.dev/f/builtins/isNull/
But I guess it's an additional lambda call performance wise. | 06:00:47 |
 toonn | MattSturgeon: Yeah, that's what I thought. Still can't find a better way to get at the options for pixelfed.nginx though, there's no valueMeta containing the configuration AFAICT. | 07:57:27 |
|  @koichiio:matrix.org joined the room. | 08:21:23 |
 Matt Sturgeon | In reply to @llakala:matrix.org
is there any reason to prefer isNull over x == null? Wasn't isNull soft-deprecated at one point, and the deprecation was removed because valid use cases were identified? Maybe I'm misremembering.
Generally speaking, == null and != null is simpler and more readable, and avoids invoking a function.
Same for ? vs hasAttr imo, although I don't think that one was ever deprecated. | 08:43:01 |
 hustlerone | anything to compact my code will do | 08:51:13 |
| Matt Sturgeon | nix-repl> options.services.pixelfed.nginx.type.description
"null or (submodule)"
nix-repl> options.services.pixelfed.nginx.valueMeta
{ }
Looks like an oversight in types.nullOr, not propagating its elem-type's valueMeta.
In fact, nullOr doesn't seem to implement v2 check+merge at all (nullOr's merge fn).
BTW, this room is really meant for discussing the nix language itself. For the module system there is https://matrix.to/#/#modules:nixos.org
| 08:52:51 |
| toonn | OK, I'll head over there. | 08:55:35 |
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| 30 May 2026 |
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| 1 Jun 2026 |
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| toonn | There's no built-in way to detect whether a value is recursive and if it is at what points it recurses, right? | 15:16:14 |
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 alexfmpe | That sounds undecidable | 15:46:02 |
| alexfmpe | maybe semi-undecidable if you trace calls | 15:46:46 |
