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2022-10-09 r/5071 fix(nix/tag): correct no match check in discrsterni1-0/+5
It uses discrDef internally, but passes `null` as the default tag name, causing Nix to drop the attribute and return an empty attribute set if the default case is hit. Consequently we need to check for the empty attribute set, not `null` to figure out if there was no match found. We can also test this behavior using `assertThrows` which was introduced after the tag library was originally written. Change-Id: I45adb2f9602762dfc867956323fb3f5ae4c8bd1d Reviewed-on: https://cl.tvl.fyi/c/depot/+/6904 Autosubmit: sterni <sternenseemann@systemli.org> Reviewed-by: Profpatsch <mail@profpatsch.de> Tested-by: BuildkiteCI
2022-01-31 r/3723 style: format entire depot with nixpkgs-fmtVincent Ambo1-19/+25
This CL can be used to compare the style of nixpkgs-fmt against other formatters (nixpkgs, alejandra). Change-Id: I87c6abff6bcb546b02ead15ad0405f81e01b6d9e Reviewed-on: https://cl.tvl.fyi/c/depot/+/4397 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org> Reviewed-by: lukegb <lukegb@tvl.fyi> Reviewed-by: wpcarro <wpcarro@gmail.com> Reviewed-by: Profpatsch <mail@profpatsch.de> Reviewed-by: kanepyork <rikingcoding@gmail.com> Reviewed-by: tazjin <tazjin@tvl.su> Reviewed-by: cynthia <cynthia@tvl.fyi> Reviewed-by: edef <edef@edef.eu> Reviewed-by: eta <tvl@eta.st> Reviewed-by: grfn <grfn@gws.fyi>
2021-01-30 r/2166 feat(nix): add nix.tag, a way of discriminating via tagged unionsProfpatsch1-0/+88
Introduces the concept of a “tag”, a single-keyed attrset which annotates a nix value with a name. This can be used to implement tagged unions (by implying the list of possible tags is well-known), which has some overlap with how `nix.yants` does it. However, the more fascinating use-case is in concert with a so-called discriminator, `match` and hylomorphisms. The discriminator can take a nix value, and add tags to it based on some predicate. With `match`, we can then use that information to convert the discriminated values again. With `hylo`, we can combine both the “constructive” discriminator step with the “destructive” match step to recursively walk over a nix data structure (based on a description of how to recurse, e.g. through attrset values or list values), and then apply a transformation in one go. Change-Id: Ia335ca8b0881447fbbcb6bcd80f49feb835f1715 Reviewed-on: https://cl.tvl.fyi/c/depot/+/2434 Tested-by: BuildkiteCI Reviewed-by: sterni <sternenseemann@systemli.org>