servant
cassava
servant | cassava | |
---|---|---|
16 | 5 | |
1,781 | 219 | |
0.8% | 0.5% | |
8.6 | 4.7 | |
4 days ago | 28 days ago | |
Haskell | Haskell | |
BSD 3-clause "New" or "Revised" License | BSD 3-clause "New" or "Revised" License |
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servant
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An alternative front end for Haskell?
> do you really have to understand language extensions?
You do when your code doesn't compile and you're trying to figure out what the error message means, or when the library you want to use makes heavy use of it for even basic functionality.
> These days one just enables GHC2021
My experience was pre-GHC2021. I basically had to enable at a minimum 5-6 language extensions in every single file.
> Mostly they're just about removing unnecessary restrictions from the older standard.
Yeah, those ones are usually fine. I have zero objection to things like FlexibleInstances or DeriveFoldable.
> Could you give an example?
I believe I was trying to implement Central Authentication Service using Servant. However, that required returning a custom HTTP status code. There has been an open Github issue for this since 2017, but it seems to require basically rewriting the entire framework: https://github.com/haskell-servant/servant/issues/732
Looking back at it now Servant does have "ServerError", but that basically requires giving up all the advantages Servant claims to have and I believe it was not a viable option at the time. Looking at the timeline I was probably also on Servant 0.15, and there seems to have been a rewrite since then.
I vaguely recall running into a similar issue trying to interact with a database, but I can't remember the details of that.
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Question: Servant with NamedRoutes and Swagger
a HasSwagger instance for NamedRoutes was added in May 2022 (in this commit) but there hasn't been a package release since March
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Monthly Hask Anything (November 2022)
If you don't like this style, the usual alternative is to change mkDualAuthHandler to take two additional arguments, Proxy tag0 and Proxy tag1 (as e.g. lots of Servant functions do, for historical reasons).
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How introduce `ResourceT` into my stack
Dunno if this is helpful, but I found this github issue about ResourceT and servant https://github.com/haskell-servant/servant/issues/1345
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Introduction to Doctests in Haskell
And what about the cabal repl --with-compiler=doctest, which was added recently, in doctest v0.20? I recently submitted a PR for Servant to use this in place of GHC environment files, because it seems less finicky to me. Was this a bad idea?
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Generate Typescript from Servant API
I asked a somewhat relevant question recently. Maybe you'll find this discussion somewhat helpful: https://github.com/haskell-servant/servant/issues/1547; two packages were talked about. One of the folks from Well Typed replied, and said they tried it recently (and worked fine).
- Named Routes in Servant
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[ANN] Servant 0.19 release
You are highly encouraged to test this release out and let us know what you think ! For bug reports, features requests or any kind of feedback, just open a ticket on our issue tracker.
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[Servant] Best practices to not mixup routes with same signatures.
Even slower than :<|> quadratic compile time in number of routes?
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Help with servant-client
Check this out https://github.com/haskell-servant/servant/issues/335#issuecomment-172300487
cassava
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Genuine question: how do you all use Haskell IRL?
I use it for everything: tracking personal finance and tax data (https://hackage.haskell.org/package/hledger), small scripts to gather online information that I want to track (https://hackage.haskell.org/package/cassava), sending alerts to my mobile device, etc...there's too much to list.
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Monthly Hask Anything (November 2022)
cassava?
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Working with CSVs
I personnaly use cassava which should have everything you need (even though it can be quite obscure some times). I also know about Frames which might reduce some boiler plate at the price of a step up in complexity (disclaimer I've never use it, but it's author is a serious guy so I'm sure this package as some benefits).
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[ANN] ttc-1.0.0.0 - Textual Type Classes
I have done a lot of CSV development! I usually use the cassava library, though I have my own library as well. The cassava library uses FromRecord, FromNamedRecord, ToRecord, and ToNamedRecord type classes for parsing and rendering records, and it uses FromField and ToField type classes for parsing and rendering fields. An identifier type like the UserName example above should declare instances for FromField and ToField in order to be used in CSV files. For types that have appropriate Render and Parse instances, I implement general functions named something like parseFieldWithTTC and toFieldWithTTC, which allows me to declare instances as follows:
What are some alternatives?
servant-ts - See the docs and live playground here
fuzzyset - :sheep: A fuzzy string set implementation in Haskell.
graphql - Haskell GraphQL implementation
llrbtree - Left-leaning red-black trees
loli
gps2htmlReport - Generates a HTML page report detailing a GPS journey, with charts, statistics and an OpenStreetMap graphic.
swagger-petstore - swagger-codegen contains a template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI / Swagger definition.
datasets - UCI Datasets for Haskell
servant-blaze
skip-list - Pure skip lists in Haskell
gc-monitoring-wai - a wai application to show `GHC.Stats.GCStats`
pipes-csv - Streaming csv parser using cassava and pipes