dhall-lang
kdl
dhall-lang | kdl | |
---|---|---|
113 | 14 | |
4,137 | 1,039 | |
0.3% | 2.3% | |
6.0 | 5.6 | |
2 months ago | 18 days ago | |
Dhall | ||
BSD 3-clause "New" or "Revised" License | GNU General Public License v3.0 or later |
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dhall-lang
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Apple releases Pkl – onfiguration as code language
Fail to see how this is any different than Dhall (https://dhall-lang.org/) other than it produces plists too.
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Pkl, a Programming Language for Configuration
Kubernetes config is a decent example. I had ChatGPT generate a representative silly example -- the content doesn't matter so much as the structure:
https://gist.github.com/cstrahan/528b00cd5c3a22e3d8f057bb1a7...
Now consider 100s (if not 1000s) of such files.
I haven't given Pkl an in depth look yet, but I can say that the Industry Standard™ of "simple YAML" + string substitution (with delicate, error prone indentation -- since YAML is indentation sensitive) is easily beat by any of:
- https://jsonnet.org/
- https://nickel-lang.org/
- https://nixos.org/manual/nix/stable/language/index.html
- https://dhall-lang.org/
- (insert many more here, probably including Pkl)
- Why the fuck are we templating YAML? (2019)
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Is Htmx Just Another JavaScript Framework?
There are underpowered languages / tools, that can only solve a problem for which they are intended poorly. But not all limited tools are like that.
Say, eBPF is prominently not Turing-complete, which allows to guarantee that a eBPF program terminates, and even how soon. Still eBPF is hugely useful in its area.
Or, say, regular expressions are limited to regular languages; in particular, they famously [1] cannot process recursive structures, like trees. Still tools like grep / ag / rg are mightily useful.
Yes, I agree that YAML is underpowered for proper k8s configuration! But it's also too powerful for its own good in other aspects [2]. I wish Google used Dhall [3] or their own purely functional config language (FCL? I already forgot the name) instead of YAML; sadly, they did not.
[1]: https://stackoverflow.com/a/1732454/223424
[2]: https://ruudvanasseldonk.com/2023/01/11/the-yaml-document-fr...
[3]: https://dhall-lang.org/
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10 Ways for Kubernetes Declarative Configuration Management
Dhall: Dhall is a programmable configuration language that combines features like JSON, functions, types, and import capabilities. Its style leans towards functional programming, so if you're familiar with functional-style languages such as Haskell, you might find Dhall to be quite intuitive.
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Berry is a ultra-lightweight dynamically typed embedded scripting language
I've been thinking along these lines but more 'strongly validated' than statically typed in the sense that you'd be better off being able to load the entire config and then produce a list of problems (and should be able to offer good editor support if done correctly).
Though https://dhall-lang.org/ demonstrates that you can statically type quite a lot of configuration to great advantage, which appears to be programmatically embeddable in multiple languages per https://docs.dhall-lang.org/howtos/How-to-integrate-Dhall.ht...
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What Is the Point of Decidability
> Where practical is in the sense of an engineer (or in their terms, a CS practitioner),
Configuration processing. E.g. I'd like my yamls to be decidable, though I'd settle for guaranteed to halt[1].
[1] https://dhall-lang.org/
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What Is Wrong with TOML?
Maybe you'd like jsonnet: https://jsonnet.org/
I find it particularly useful for configurations that often have repeated boilerplate, like ansible playbooks or deploying a bunch of "similar-but" services to kubernetes (with https://tanka.dev).
Dhall is also quite interesting, with some tradeoffs: https://dhall-lang.org/
A few years ago I did a small comparison by re-implementing one of my simpler ansible playbooks: https://github.com/retzkek/ansible-dhall-jsonnet
- Show HN: FlakeHub – Discover and publish Nix flakes
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Home Blog Better configuration languages – A talk about Dhall [video]
And to checkout Dhall: https://dhall-lang.org/
kdl
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XL: An Extensible Programming Language
IMO, there’s a wide unexplored design space between the minimalism of Lisp and richness of other languages. A programming language inspired by something like KDL (https://github.com/kdl-org/kdl) has the potential to be in a very sweet spot between the two. "Everything is a node" instead of "everything is a list" is only slightly more complicated, but also vastly more readable that a soup of parenthesis.
- Things you didn't know you could fuzz - FuzzingWeekly CW17
- Things you didn’t know you could fuzz: - FuzzingWeekly CW17
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SDLang – Simple Declarative Language
KDL is a variant of SDLang that’s worth checking out.
https://github.com/kdl-org/kdl
- KDL
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Parsing JSON is a Minefield 💣 (2018)
Either way I've got high hopes for KDL becoming the new gold standard for clean, flexible data formats that are editable by hand.
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The KDL Document Language
I'd love to understand why all the advertised implementations have permissive licenses except for the Rust implementation, which is released under the Parity Public License 7.0.0 [1]? This seems to be as restrictive as the GPL, no?
In my mind, copyleft licenses applied to infrastructural projects like kdl-rs prematurely limits their adoption and promotes the development of alternatives with more permissive licensing, since the spec is released under a Creative Commons license [2].
[1]: https://github.com/kdl-org/kdl-rs/blob/87f836134c1d901ff5ce6...
[2]: https://github.com/kdl-org/kdl/blob/785abebfc507ff6b7bdeac07...
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The KDL Document Language, an alternative to YAML/JSON/XML
p.s. if anyone is interested in helping or just wants the info, this is the tracking issue for implementations supporting 1.0 (the actual thing that just got released): https://github.com/kdl-org/kdl/issues/144
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ParserObjects Parser Combinator Library for .NET
Oh nice. It will be a nice library to use to parse KDL (https://github.com/kdl-org/kdl)
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The YAML file of Prometheus Operator has over 13k lines, one of the longest YAML files on GitHub ever
It's still in its infancy but I'm keeping an eye on kdl
What are some alternatives?
cue - CUE has moved to https://github.com/cue-lang/cue
ron - Rusty Object Notation
jsonnet - Jsonnet - The data templating language
json5 - JSON5 — JSON for Humans
cue - The home of the CUE language! Validate and define text-based and dynamic configuration
prometheus-operator - Prometheus Operator creates/configures/manages Prometheus clusters atop Kubernetes
terraform - Terraform enables you to safely and predictably create, change, and improve infrastructure. It is a source-available tool that codifies APIs into declarative configuration files that can be shared amongst team members, treated as code, edited, reviewed, and versioned.
config - configuration library for JVM languages using HOCON files
jsonlogic - Go Lang implementation of JsonLogic
jsonjsc - A Python JSONDecoder library for parsing out Javascript comments in JSON files.
nix-gui - Use NixOS Without Coding
Slim - Slim is a template language whose goal is to reduce the syntax to the essential parts without becoming cryptic.