reflex-platform
penrose
Our great sponsors
reflex-platform | penrose | |
---|---|---|
10 | 16 | |
713 | 2,598 | |
0.8% | 0.3% | |
8.3 | 0.0 | |
3 months ago | over 1 year ago | |
Nix | Haskell | |
BSD 3-clause "New" or "Revised" License | MIT License |
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reflex-platform
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The Haskell job market has been growing steaily since 2008
We used reflex-frp, so our app was a webview that worked on localhost and Android. The docs say it also works on iOS but we don't have an iPhone.
The process was learning Functional Reactive Programming, then learning reflex-frp, then getting a contract with obsidian (creators of reflex) for one hour a week where we could ask questions.
( https://github.com/reflex-frp/reflex-platform )
We had a grant requirement to create a phone client for Tahoe-LAFS, a Python application with a bunch of dependencies, including ZFEC, a forward error correction library.
( https://tahoe-lafs.readthedocs.io/ )
( https://github.com/tahoe-lafs/zfec/ )
We needed bug for bug compatibility with the Python codebase, so I ran Tahoe on localhost and tested the Haskell client against the Python server. We used servant to build the API, since it builds both client and server side from the same description.
( https://hackage.haskell.org/package/servant )
- Resurrection/modernization of an old Haskell+Haste project (boardgame Yinsh)
- reflex-platform and ghc version
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Exploring ideas in Haskell
The type classes do take a toll on performance, but in reflex-platform we change GHC's default flags to make the situation a lot better. It's still not ideal, but our performance winds up being OK for real applications. The most important part is that the performance scales reasonably well as the application grows. It might probably be good at some point to use backpack instead of a typeclass so that specialization can be enforced - though I'd prefer if GHC gave a way to just force specialization more effectively.
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Any News On Haskell For Android ?
Obelisk / reflex-platform contain nix-based solutions to building Haskell code for mobile, so you might be interested in checking out how they do it (or just using them).
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Creating a Haskell Application Using Reflex. Part 1
In this series of posts, we will describe how a Haskell web application can be developed using reflex-platform. reflex-platform offers reflex and reflex-dom packages. reflex package is the Haskell implementation of Functional reactive programming (FRP). reflex-dom library contains a large number of functions, classes, and types used when dealing with DOM. The packages are separated as it is possible to use the FRP approach not only for web-development. We will develop theTodo List application that allows carrying out various manipulations on the task list.
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[JOBS] Obsidian Systems is Hiring
reflex-platform
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Setting up Reflex with VS Code in WSL
To clarify the situation, the canonical way to develop reflex-dom projects is to start from the reflex-platform. See here: https://github.com/reflex-frp/reflex-platform/blob/develop/docs/project-development.rst
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Nix - WSL - no C compiler provided for this platform
This might also be coming from the tests of the library (even if they can run in the browser, their tests might not). You can disabled tests using an overrides attribute in project.nix (if using reflex-stone). You can see what it should look like here : https://github.com/reflex-frp/reflex-platform/blob/develop/project/default.nix#L79. You should add this attribute at the same level where "useWarp = true;" is. This should then have lines like "diagrams = pkgs.haskell.lib.dontCheck super.diagrams;" for example if you want to disable the tests for the diagrams package.
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Can I embed Reflex-FRP in a larger site?
then you compile to js using ghcjs like this, then closure compile and gzip it to get the size way down. Then it just becomes a normal script you include wherever you need it.
penrose
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Secretly introduced rust in my company, now they love it!
There is a fork that compiles to js https://github.com/ghcjs/ghcjs compiler, and I believe the official glasgow compiler is working towards also supporting js/wasm (although I don't think they are supported as of yet).
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Resurrection/modernization of an old Haskell+Haste project (boardgame Yinsh)
I don't know anything about Haste, but you can get GHCJS 8.6 (or 8.10 with a bloated executable) via nix fairly easily or alternatively wait until the JS target recently merged into mainline ghc gets production ready: https://engineering.iog.io/2023-01-26-ghc-update.
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How does GHC built from source set header search path?
Ah GHCJS does have this header: https://github.com/ghcjs/ghcjs/blob/ghc-8.10/lib/boot/data/include/stg/DLL.h
- Haskell, JS, and WebDev?
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Status of GHCJS for larger projects
It seems like https://github.com/ghcjs/ghcjs/issues/821 is a rigid dealbreaker for any sizable project.
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GHCJS or Asterius
About the FFI: GHCJS extended the FFI to support inlined JS, named arguments, etc. See https://github.com/ghcjs/ghcjs/blob/master/doc/foreign-function-interface.md For now the JS backend only implements FFI calls similarly to native FFI. The rest will be open to discussion later (e.g. in a ghc-proposal) and should take into account the Wasm backend so that the same user code compiles with both backends as much as possible.
- Just few questions on Miso and GHCjs
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Memory from finished thread is not getting reclaimed
Other than that, I ran into a GHCJS and Miso bug, but they weren't too hard to solve.
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GHC Pluggable Backend?
There are a bunch of open branches. And yes, there is ghcjs support in haskell.nix, see this comment.
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Is GHCJS stuck on GHC 8.6.5?
When I compile the ghc-8.8 branch locally, I get a number of test failures from the test suite. I'm not sure exactly how to fix them and they aren't currently my highest hobby priority.
What are some alternatives?
obelisk - Functional reactive web and mobile applications, with batteries included.
ascii-art-to-unicode - Small program to convert ASCII box art to Unicode box drawings.
Yampa - Functional Reactive Programming domain-specific language for efficient hybrid systems
ihp - 🔥 The fastest way to build type safe web apps. IHP is a new batteries-included web framework optimized for longterm productivity and programmer happiness
vscode-ghc-simple - Simple GHC (Haskell) integration for VSCode
safe - Haskell library for safe (pattern match free) functions
hackcell - Apecs + SDL2 roguelike
aeson-serialize - Functions for serializing a type that is an instance of ToJSON
nixkell - A simple Nix-Haskell skeleton
cognimeta-utils - Utilities used by Perdure
nix - Nix, the purely functional package manager
miso - :ramen: A tasty Haskell front-end framework