data-default-generics alternatives and similar packages
Based on the "Data" category.
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compendium-client
DISCONTINUED. Mu (μ) is a purely functional framework for building micro services. -
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streaming
An optimized general monad transformer for streaming applications, with a simple prelude of functions -
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text-icu
This package provides the Haskell Data.Text.ICU library, for performing complex manipulation of Unicode text. -
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InfluxDB – Built for High-Performance Time Series Workloads
Do you think we are missing an alternative of data-default-generics or a related project?
README
data-default-generics
A class for types with a default value.
This is a fork of the package originally developed by Lukas Mai, data-default, with the following additions:
- Regrouped everything in a single module
- Added several instances, namely Either, Text, ByteString, etc
- Added Generics support by Jonathan Fischoff, with some additional support for recursive datatypes by me, with the precious help of José Pedro Magalhães
It should be usable as a drop-in replacement.
Usage
Supose you've got a structure:
data TestRec = TestRec
{ bool :: Bool
, txt :: T.Text
, bs :: BSL.ByteString
, lst :: [CInt]
, ut :: UTCTime
} deriving (Eq,Show)
And you want to quickly define a default value for it, in a way that does not require code changes if the structure later gets altered. Modify the previous to:
{-# LANGUAGE DeriveGeneric #-}
(...)
import Data.Default.Generics
import GHC.Generics
(...)
data TestRec = TestRec
{ bool :: Bool
, txt :: T.Text
, bs :: BSL.ByteString
, lst :: [CInt]
, ut :: UTCTime
} deriving (Eq,Show, Generic)
instance Default TestRec
And then you can use the default value for this structure as def, as long as you import Data.Default.Generics.
Bugs
Issues and pull requests are most welcome. Any additional instance for data types from the Haskell Platform will be considered.