jsonnet
toml
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jsonnet | toml | |
---|---|---|
48 | 45 | |
6,745 | 19,134 | |
0.9% | 0.6% | |
8.4 | 4.3 | |
8 days ago | 10 days ago | |
Jsonnet | Python | |
Apache License 2.0 | MIT License |
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jsonnet
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A Reasonable Configuration Language
jsonnet[1] and kapitan[2] are the tools I currently use. Their learning curve is not optimal (and I tried to contribute to smoothen it with a jsonnet course[3] and a 'get started wit kapitan' blog post[4]), but once used to it it's hard to do without, and their combination makes them even more useful (esp. if you deploy K8s).
In Ruud's case, Jsonnet might have been worth looking at as Hashicorp tools can be configured with json in addition to HCL. But that would have been less fun I guess ;-)
I hope for Ruud it finds its niche, there's quite some competition in this field!
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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://nixos.org/manual/nix/stable/language/index.html
- (insert many more here, probably including Pkl)
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Introduction to Jsonnet: The YAML/JSON templating language
jsonnet cli: link
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10 Ways for Kubernetes Declarative Configuration Management
Jsonnet: A data template language implemented in C++, suitable for application and tool developers, can generate configuration data and organize, simplify and manage large configurations without side effects.
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-❄️- 2023 Day 4 Solutions -❄️-
[Language: Jsonnet] (on GitHub)
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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: Keep – GitHub Actions for your monitoring tools
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That people produce HTML with string templates is telling us something
Apologies for the lack of context, and for missing this comment until today.
Both are tools for defining kubernetes manifests (which are YAML) in a reusable manner.
Jsonnet is a formally specified extension of JSON. It’s essentially a functional programming language (w/some object oriented features) that generates config files in JSON/YAML/etc, so it’s straightforward to determine whether an input file is valid, and to throw an error that points to an exact line if it’s not. It has a high learning curve, especially for people whose only experience is with imperative languages.
Helm charts also generate YAML/JSON config files, but they use Go templating. This is easier and faster to understand, since it’s mostly string substitution and not much logic (there’s conditionals, iterators, and very basic helper functions). Unfortunately a simple typo or mistake can cause errors that are difficult to diagnose (the message may indicate a problem far away in code from the actual mistake). It can also generate output that’s valid according to the string templating rules, but not what was intended, which can be very confusing to debug.
Despite these shortcomings, the vast majority of kubernetes applications are distributed as helm charts. I understand why things ended up this way, but I still wish it were more common for people to invest the upfront effort to learn the superior tool, so it could be more widespread.
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TOML: Tom's Obvious Minimal Language
I like Google's Jsonnet [1], which has all of this except for 4.
Jsonnet is quite mature, with fairly wide language adoption, and has the benefit of supporting expressions, including conditionals, arithmetic, as well as being able to define reusable blocks inside function definitions or external files.
It's not suitable as a serialization format, but great for config. It's popular in some circles, but I'm sad that it has not reached wider adoption.
- Jsonnet – The Data Templating Language
toml
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Let's meet Black: Python Code Formatting
Black uses by default the pyproject.toml file. This file contains a section for each different tool we want to use. The use of a configuration file like pyproject.toml is quite a good choice and helps the contributors to use the same tools and configurations you're using.
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Why the fuck are we templating YAML? (2019)
> I don't think even though TOML has some official spec
Read it on https://toml.io/ (Full spec on upper-right… with its evolutions up to final 1.00 version).
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'Hypermodernize' your Python Package
ini2toml which automatically translates .ini/.cfg files into TOML
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An INI Critique of TOML
toml 1.1 will allow non-ascii in keys (and multi-line inline tables)
See https://github.com/toml-lang/toml/blob/main/CHANGELOG.md
- What Is Wrong with TOML?
- TOML: Tom's Obvious Minimal Language
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What do ya'll think of TOML's - Support almost all programming language popularized today.
GitHub - toml-lang/toml: Tom's Obvious, Minimal Language
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`toml` vs `toml_edit` (ie `toml` 0.6 is out)
See https://github.com/toml-lang/toml/blob/main/CHANGELOG.md
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The YAML Document from Hell
> I still think it's the best format out there.
What do you think of https://toml.io ?
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7 Python 3.11 new features 🤩
TOML built-in support
What are some alternatives?
kube-libsonnet - Bitnami's jsonnet library for building Kubernetes manifests
tomli - A lil' TOML parser
dhall-lang - Maintainable configuration files
json5 - JSON5 — JSON for Humans
cue - CUE has moved to https://github.com/cue-lang/cue
starship - ☄🌌️ The minimal, blazing-fast, and infinitely customizable prompt for any shell!
cue - The home of the CUE language! Validate and define text-based and dynamic configuration
dhall - Maintainable configuration files
docker-selenium - Provides a simple way to run Selenium Grid with Chrome, Firefox, and Edge using Docker, making it easier to perform browser automation
cdk8s - Define Kubernetes native apps and abstractions using object-oriented programming
tomlplusplus - Header-only TOML config file parser and serializer for C++17.