polysemy
Cabal
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polysemy | Cabal | |
---|---|---|
7 | 84 | |
1,023 | 1,563 | |
0.5% | 0.7% | |
5.5 | 9.8 | |
about 1 month ago | 2 days ago | |
Haskell | Haskell | |
BSD 3-clause "New" or "Revised" License | BSD 3-clause "New" or "Revised" License |
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polysemy
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Functional Declarative Design: A Comprehensive Methodology for Statically-Typed Functional Programming Languages
Thirdly, composing arbitrary effects without losing state is really, really difficult. Things are fine when you limit yourself to State and Reader, sure, but once you start with nondeterminism you’ll discover it’s shockingly easy to produce behaviors that are baffling unless you’ve spent a preposterous amount of time thinking about this stuff. (I’ve been bitten in prod by silent state-dropping bugs, and rarely have I been more flummoxed.) Consider this example, which produces silent changes in the semantics of <|> depending on whether you use it inside or outside of a higher-order effect. Every single effect library (besides the still-unreleased eff) gets certain combinations of effects + nondeterminism wrong. You could make the argument that most people don’t use nondeterministic monads, but eDSLs really shine when you have access to them, as you can turn a concrete interpreter to an abstract one fairly easily.
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Introduction to Doctests in Haskell
Looking for a few projects that make use of it, I found accelerate, hawk, polysemy and pretty-simple, so I'll be interested to poke around in their code and see how they have things set up.
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ReaderT pattern is just extensible effects
Right, I think I'll just give it a shot to see. Polysemy is nice but I'm still having trouble getting what I want out of it (which may very well be entirely a fault of my own understanding)
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Where's more discussion of the designs of effect systems?
Languages such as Koka only support algebraic effects, not scoping operations such as catch and listen. The Effect Handlers in Scope paper introduces scoping operations, which lead to the Haskell libraries fused-effects and polysemy, but they turned out to have some weird semantics. eff is her effort to fix that.
- Monthly Hask Anything (June 2021)
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Trouble Reinterpreting Higher Order Effects in PolySemy
Looking at the interpreter for Reader might give some clues if this doesn't work. https://github.com/polysemy-research/polysemy/blob/master/src/Polysemy/Reader.hs#L38-L45
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Structuring Code with ZIO & ZLayers
*But I'm not terribly well versed in Scala's other DI offerings. I came from Haskell and didn't find anything in Scala that clicked with me until I found ZIO. It reminded me a lot of my favorite way of writing Haskell programs (https://github.com/polysemy-research/polysemy)—albeit with a completely different implementation.
Cabal
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Would anyone be interested in hoot: A cabal wrapper for haskell based on Cargo?
Also, there's already a cabal RFC to support toml: https://github.com/haskell/cabal/issues/7548
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On the verge of giving up learning Haskell because of the terrible tooling.
Cabal has a lot of dark corners once you stray from the happy path. Just checked and I'm currently subscribed to 37 threads on the issue tracker, and I'm not a maintainer. A lot of these are related to lesser-used features like cabal scripts, environment files and doctests (though I think all of these things would used more if they were more reliable), but there's also plenty of stupid stuff like: - https://github.com/haskell/cabal/issues/3313 - https://github.com/haskell/cabal/issues/8527 - https://github.com/haskell/cabal/issues/8391 - https://github.com/haskell/cabal/issues/7789 - https://github.com/haskell/cabal/issues/6888 - https://github.com/haskell/cabal/issues/6999 - https://github.com/haskell/cabal/issues/5271
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Problems installing hindent witch haskell tool stack on windows 10
Given that Mike Pilgrim (the Stack maintainer) is on Windows, and Cabal has issues on Windows, I think it might be easier to get Windows specific fixes merged in Stack.
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Help figuring out output from Cabal resolver
The error message is not too helpful. This is the target of a long-standing ticket: https://github.com/haskell/cabal/issues/7993 Your help would be very welcome.
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There is No “Tooling Issue” in Haskell
By the way, there are some open issues for the command to add a package in Cabal.
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Why GHCi is my new calculator
That's interesting. Could you could open a an issue about this? https://github.com/haskell/cabal/issues
- Any open source projects to contribute to for beginners
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The best way to add a flag to copy documentation to given location?
I created this issue a few months ago: https://github.com/haskell/cabal/issues/8270
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Trying to figure out cabal dependency management
Reported this as a bug in cabal.
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JavaScript backend merged into GHC | IOG Engineering
We definitely plan to have benchmarks once we start working on performance. We haven't started yet because there were more urgent tasks. For example: ensuring that the testsuite runs on CI with the JS backend (should be completed this week or the next), ensuring that the toolchain works properly (we're writing a tutorial and we've found new bugs, e.g. yesterday I've fixed the support for js-sources in Cabal https://github.com/haskell/cabal/pull/8636), adding TH support...
What are some alternatives?
fused-effects - A fast, flexible, fused effect system for Haskell
stack - The Haskell Tool Stack
purescript - A strongly-typed language that compiles to JavaScript
haskell.nix - Alternative Haskell Infrastructure for Nixpkgs
freer-simple - A friendly effect system for Haskell
static-haskell-nix - easily build most Haskell programs into fully static Linux executables
ast-monad - A library for constructing AST by using do-notation
cartel
Exercism - Scala Exercises - Crowd-sourced code mentorship. Practice having thoughtful conversations about code.
hackage-repo-tool - Hackage security framework based on TUF (The Update Framework)
ghc - Mirror of the Glasgow Haskell Compiler. Please submit issues and patches to GHC's Gitlab instance (https://gitlab.haskell.org/ghc/ghc). First time contributors are encouraged to get started with the newcomers info (https://gitlab.haskell.org/ghc/ghc/wikis/contributing).
codeworld - Educational computer programming environment using Haskell