jank
immer
jank | immer | |
---|---|---|
21 | 25 | |
1,465 | 2,439 | |
4.6% | - | |
9.5 | 6.2 | |
4 days ago | 3 days ago | |
C++ | C++ | |
Mozilla Public License 2.0 | Boost Software License 1.0 |
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jank
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Compiling a Lisp
There's an effort afoot to bring this to the Clojure world, with the lovely name jank: https://jank-lang.org
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A Tour of Lisps
I also liked that reference since I had not heard of Jank before. It is a work in progress so I just added a calendar entry for 9 months from now to check it out. https://jank-lang.org/
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Boehm Garbage Collector
There will be a lot of room for this, once I build out more of the features. In particular, there will be a lot of Clojure libraries which need to gain jank support. Clojure doesn't require "porting", so to speak, since it has a special .cljc file which can use reader conditionals to check the host that it's in (clj, cljs, cljr, jank, etc). So anywhere those libs are using Java interop, we'd need to wrap it to use native interop instead.
On the compiler and tooling itself, I have some open issues here: https://github.com/jank-lang/jank/issues
The vast majority of it is heavy C++ work, though. Outside of that, the biggest gains will come from time spent on packaging, distribution, and testing on various platforms.
And if none of that sounds interesting or applicable, don't worry. Just be sure to join the Slack channel and hang out with us. :)
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Using C++ as a scripting language, part 8
On the top of using C++ for scripting, and related to the discussion of CERN's ROOT/Cling, I am developing a Clojure dialect on C++/LLVM called jank: https://jank-lang.org/
jank is a true Clojure, meaning you get interactive, REPL-based development and a whole stdlib of persistent, immutable data structures and functions to transform them. But it's also C++, so you can write inline C++ within your jank source, and interpolate jank values within that. You can link with existing native code using LLVM and you can embed jank into your existing native projects to use for scripting.
jank is pre-alpha, right now, and I've only been showing it to Clojure devs so far, but there's a huge audience of C++ devs which may be interested in introducing Clojure to their native code.
- Leaving Clojure - Feedback for those that care
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[ANN] London Clojurians Talk: The jank programming language (by Jeaye Wilkerson)
jank (https://jank-lang.org/) is a Clojure dialect on LLVM with C++ interop. In this talk, Jeaye will cover jank's use cases, some challenges around building a native Clojure dialect, and some insights about Clojure itself found only by spelunking deep into the Clojure compiler.
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Janet for Mortals
I wonder if Jank [1] could be such a Lisp? I haven't played around with it, but I really like the idea and would love to see it get more traction.
[1]: https://jank-lang.org/
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Loopr: A Loop/Reduction Macro for Clojure
This isn't usable yet, but in active development by the author, and looks promising: https://jank-lang.org/
- Show HN: Programming Google Flutter with Clojure
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What is most in need in Clojure open-source ecosystem?
Jank looks pretty legit: https://jank-lang.org/
immer
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Text Editor Data Structures: Rethinking Undo
I've been working on an editor (not text) in C++ and pretty early got into undo/redo. I went down the route of doIt/undoIt for commands but that quickly got old. There was both the extra work needed to implement undo separately for every operation, but also the nagging feeling that the undo operation for some operation wasn't implemented correctly.
In the end, I switched to representing the entire document state using persistent data structures (using the immer library). This vastly simplified things and implementing undo/redo becomes absolutely trivial when using persistent data structures. It's probably not something that is suitable for all domains, but worth checking out.
https://github.com/arximboldi/immer
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Show HN: A hash array-mapped trie implementation in C
How does this compare to https://github.com/arximboldi/immer (other than the C/C++ difference)?
Also, it's my understanding that, in practice, persistent data structures require a garbage collector in order to handle deallocation when used in a general-purpose way. How does your implementation handle that?
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Text Editor Data Structures
You might be interested in ewig and immer by Juan Pedro Bolivar Puente:
https://github.com/arximboldi/ewig
https://github.com/arximboldi/immer
See the author instantly opening a ~1GB text file with async loading, paging through, copying/pasting, and undoing/redoing in their prototype “ewig” text editor about 27 minutes into their talk here:
https://m.youtube.com/watch?v=sPhpelUfu8Q
It’s backed by a “vector of vectors” data structure called a relaxed radix balanced tree:
https://infoscience.epfl.ch/record/169879/files/RMTrees.pdf
That original paper has seen lots of attention and attempts at performance improvements, such as:
https://hypirion.com/musings/thesis
https://github.com/hyPiRion/c-rrb
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value semantics and spans/views
You’re absolutely right, however people have been putting in the “extra efforts” required for efficiency. Check out immer if you’re interested.
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How to synchronize access to application data in multithreaded asio?
The C++ immer library: https://github.com/arximboldi/immer
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Purely Functional Data Structure by Chris Okasaki [pdf]
For C++ check this one out - https://github.com/arximboldi/immer
- Persistent and immutable data structures written in C++14
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Introducing B++ Trees, a C++ B+ Tree library
Yeah I agree that I should link that wikipedia page in the docs, I'll do that as soon as I get a chance. immer (https://github.com/arximboldi/immer) also links that page in its docs, for the exact same reason I'm sure. Interestingly, there is a lot of overlap between persistent data structures in the functional programming sense and persistent data structures in the persisted-to-disk sense because persistent data structures in the FP sense are one of the best ways to guarantee atomic updates and safe failure recovery in a persisted-to-disk system! Btrfs and ZFS, as well as many databases, are at their core basically just copy-on-write B+ trees.
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What are some architectural patterns for creating a game editor.
I’ve never tried it, but I love the idea of implementing editor scene state using immutable data structures like https://github.com/arximboldi/immer With that, every edit would append a new node to a list of scene states. Undo/redo becomes iterating your view of the scene up and down through that list. Can’t screw up an undo function if there’s never any work to do :P
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TypeScript Without Side Effects
I have! I think it's related to the C++ immer library which I used several years ago in Vortex. It's kinda like the previous generation of ValueScript. 🍻
What are some alternatives?
graalvm-clojure - This project contains a set of "hello world" projects to verify which Clojure libraries do actually compile and produce native images under GraalVM.
babashka - Native, fast starting Clojure interpreter for scripting
wyvern - Automatic conversion of call by value into call by need in the LLVM IR.
clj-kondo - Static analyzer and linter for Clojure code that sparks joy
schema-inference - Schema Inference of Malli Schemas
pil21 - PicoLisp is an open source Lisp dialect. It is based on LLVM and compiles and runs on any 64-bit POSIX system. Its most prominent features are simplicity and minimalism.
ewig - The eternal text editor — Didactic Ersatz Emacs to show immutable data-structures and the single-atom architecture
clasp - clasp Common Lisp environment
deprecated-coalton-prototype - Coalton is (supposed to be) a dialect of ML embedded in Common Lisp.
onejit - [ALPHA] Go just-in-time compiler
awesome-modern-cpp - A collection of resources on modern C++