microKanren
nimforum
microKanren | nimforum | |
---|---|---|
2 | 29 | |
298 | 749 | |
- | 0.7% | |
0.0 | 5.1 | |
almost 10 years ago | about 2 months ago | |
Scheme | Nim | |
- | MIT License |
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microKanren
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Lisp-Stick on a Python
which uses a Lisp to define itself. This means roughly that if you understand enough Lisp to understand this program (and the little recursive offshoots like eval-cond), there is nothing else that you have to learn about Lisp. You officially have read the whole language reference and it is all down to libraries after that. Compare e.g. with trying to write Rust in Rust where I don't think it could be such a short program, so it takes years to feel like you fully understand Rust.
Indirectly this also means that lisps are very close at hand for “I want to add a scripting language onto this thing but I don't want to, say, embed the whole Lua interpreter” and it allows you to store user programs in a JSON column, say. You also can adapt this to serialize environments so that you can send a read-only lexical closure from computer to computer, plenty of situations like that.
Aside from the most famous, you have things like this:
1. The heart of logic programming is also only about 50 lines of Scheme if you want to read that:
https://github.com/jasonhemann/microKanren/blob/master/micro...
2. Hygienic macros in Rust probably owe their existence to their appearance in Lisps.
C2 asks the same question here: https://wiki.c2.com/?LispShowOffExamples with answers like
3. The object model available in Common Lisp was more powerful than languages like Java/C++ because it had to fit into Lisp terms (“the art of the metaobject protocol” was the 1991 book that explained the more powerful substructure lurking underneath this object system), so a CL programmer could maybe use it to write a quick sort of aspect-oriented programming that would match your needs.
4. Over there a link shows how in 16 LOC you can implement a new domain-specific language to define and run finite state machines: http://www.findinglisp.com/blog/2004/06/automaton-cleanup.ht...
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William Byrd on Logic and Relational Programming, MiniKanren (2014)
> I think that with such modern additions (i.e. apart from the cut) Prolog moves closer to the declarative ideal without sacrificing its all-around usability as a general purpose language. What do you think?
I also used to think that Prolog was moving closer to the delcarative ideal. And I suspect that most expert Prolog programmers believe similarly.
However, my attitude has changed in the past few years, after seeing Prolog programmers try to implement the relational interpreter from the 2017 ICFP pearl in Prolog.
The problem is one of composing the pure features needed for expressing a program as complicated as the relational interpreter. (Of course, the relational interpreter is designed to be as short and simple as possible, bit it is still more complicated than pure relations you will find in a Prolog textbook, for example.)
In theory, you can easily combine unification with the occurs check, SLG-resolution, disequality/disunification constraints, type constraints, etc., and avoid all impure uses of extra-logical features. In practice, I've seen people struggle to combine these features within a single Prolog implementation. In fact, after multiple attempts from multiple Prolog experts, I have yet to see a version of the relational Scheme interpreter in Prolog that can match the behavior of the miniKanren version.
I'm not claiming that someone couldn't implement a full relational interpreter in Prolog. Obviously they could, since Prolog is Turing-complete. I'm only saying that the default choices of Prolog, plus the intricacies of combining multiple pure features (and leaving out standard and useful non-relational features), seems to make writing a relational interpreter much harder than I would have expected.
If you are up for a challenge, I'd be happy to work on a Prolog version of the Scheme interpreter with you!
Based on what I've seen from Prolog experts trying to reproduce the relational interpreter, and conversations with Prolog experts, my current thinking is that Prolog is actually not a good language for relational programming. Too many of the defaults must be adjusted or overridden, too many standard techniques and idioms must be abandoned, and too many potentially incompatible libraries must be composed in order to get everything "just right."
The problem isn't that relational programming in Prolog isn't possible. The problem is that it requires enough work and non-standard techniques that in practice people don't do it.
At least, that is what I observe as an outsider.
If there is an easy way to combine features within a single FOSS Prolog implementation to allow for the types of relational programming we do in miniKanren, I'd be delighted to see it in action. I'd also be delighted to write a paper about it with you! :)
> Finally, I'd like to know more about minikanrens' search. I'll look around on the internet, but is there a source you would recommend?
I would recommend reading Jason Hemann and Dan Friedman's lovely little paper on microKanren, which gives a tutorial reconstruction of miniKanren's complete interleaving search, starting from depth-first search:
http://webyrd.net/scheme-2013/papers/HemannMuKanren2013.pdf
https://github.com/jasonhemann/microKanren
The standard exercise for learning microKanren is to translate the resulting ~50 lines of Scheme code into the language of your choice.
You might also like this more technical paper on the `LogicT` monad:
Backtracking, interleaving, and terminating monad transformers: (functional pearl)
nimforum
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How can I add graphics to my nim program?
If the video example does not work, you can use the examples projects in the nim SDL repository. When ex101_init.nim works, there is no reason the video example does not work. If you have further issues, do not hesitate to share a minimal working example with your detailed configuration (Nim compiler version, command line you used, file directory, libraries installed) on the forum.nim-lang.org
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Best Web Framework Features?
It might be worth posting this on the official nim forum (https://forum.nim-lang.org/) to cast a wider net.
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Some forum software written in Rust
Obviously forums aren't as popular as they used to be, so this topic might not be of interest to many. For folks that want to run a forum, they'd most certainly go with Discourse (Ruby), Flarum (PHP), Xenforo (PHP), NodeBB (Javascript), Nimforum (Nim) and maybe Casnode (Go)
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Can't post in the NIM forum
https://forum.nim-lang.org/ doesn't let me post.
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Minimalist self hosted apps
NimForum - https://github.com/nim-lang/nimforum
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Lisp-Stick on a Python
You sound like you are in just the right demographic to love Nim...The Forum [1] is a good place to get support.
https://forum.nim-lang.org/
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How the SQLite Virtual Machine Works
"embedded" can mean a few different things so that's a bit confusing for me, but if the intent was "show me places sqlite is used as a database backend for user-facing web software", the Nim forum (https://github.com/nim-lang/nimforum) uses sqlite as its database backend.
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Good discussion forum for open source project?
I love NimForum, like a simplified discourse and super light on resources. Example
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Flarum – Simple forum software for building great communities
https://forum.nim-lang.org
uses sqlite, is actively improved, they claim the nim language makes small cross-platform binaries but none for this release it seems.
- What are your project ideas to end capitalism?
What are some alternatives?
mediKanren - Proof-of-concept for reasoning over the SemMedDB knowledge base, using miniKanren + heuristics + indexing.
FluxBB - FluxBB is a fast, light, user-friendly forum application for your website.
dissertation-single-spaced - Single-spaced version of my dissertation, 'Relational Programming in miniKanren: Techniques, Applications, and Implementations'
aether - Aether client app with bundled front-end and P2P back-end
calysto_scheme - A Scheme kernel for Jupyter that can use Python libraries
cligen - Nim library to infer/generate command-line-interfaces / option / argument parsing; Docs at
trial - A fully-fledged Common Lisp game engine
zig - General-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
clinch - Common Lisp 3D/2D Graphics Engine for OpenGL
Nim - Nim is a statically typed compiled systems programming language. It combines successful concepts from mature languages like Python, Ada and Modula. Its design focuses on efficiency, expressiveness, and elegance (in that order of priority).
legit - CL interface to the GIT binary.
Flarum - Simple forum software for building great communities.