The streaming-cassava package

[ Tags: data, library, mit, streaming ] [ Propose Tags ]

Stream values to/from CSV using Cassava.

Support is available for both named and "plain" data types, optional header support and option handling.

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Dependencies base (>=4.8 && <5), bytestring, cassava (==0.5.*), mtl, streaming (>= && <0.3), streaming-bytestring (<0.2), transformers [details]
License MIT
Copyright Ivan Lazar Miljenovic
Author Ivan Lazar Miljenovic
Category Data, Streaming
Source repo head: git clone
Uploaded Tue Jan 23 04:21:11 UTC 2018 by IvanMiljenovic
Distributions NixOS:
Downloads 242 total (23 in the last 30 days)
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Status Docs available [build log]
Last success reported on 2018-01-23 [all 1 reports]
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cassava support for the streaming ecosystem

This library allows you to easily stream CSV data in and out. You can do so using both "plain" record-based (with optional header support) or name-based (header required to determine ordering) encoding/decoding.

All encoding/decoding options are supported, it's possible to automatically add on default headers and you can even choose whether to fail on the first parse error or handle errors on a row-by-row basis.

Errors with readFile

A common use-case is to stream CSV-encoded data in from a file. You may be tempted to use readFile from streaming-bytestring to obtain the file contents, but if you do you're likely to run into exceptions such as hGetBufSome: illegal operation (handle is closed).

The recommended solution is to use the streaming-with package for the IO aspects. You can then write something like:

withBinaryFileContents \"myFile.csv\" $
  . 'decodeByName'