Popularity
7.5
Declining
Activity
0.0
Stable
29
6
1

Monthly Downloads: 107
Programming language: Haskell
License: MIT License
Tags: Text    
Latest version: v0.1.0.1

say alternatives and similar packages

Based on the "Text" category.
Alternatively, view say alternatives based on common mentions on social networks and blogs.

Do you think we are missing an alternative of say or a related project?

Add another 'Text' Package

README

say

Send textual messages to a Handle in a thread-friendly way.

Build Status Build status

The motivation for this package is described in a blog post on Haskell's Missing Concurrency Basics. The simple explanation is, when writing a line of textual data to a Handle - such as sending some messages t o ther terminal - we'd like to have the following properties:

  • Properly handle character encoding settings on the Handle
  • For reasonably sized messages, ensure that the entire message is written in one chunk to avoid interleaving data with other threads
    • This includes the trailing newline character
  • Avoid unnecessary memory allocations and copies
  • Minimize locking
  • Provide a simple API

On the last point: for the most part, you can make the following substitutions in your API usage:

  • Replace putStrLn with say
  • Replace print with sayShow
  • If you're using a String instead of Text, replace putStrLn with sayString

In addition, sayErr, sayErrString and sayErrShow work on standard error instead, and hSay, hSayString and hSayShow work on arbitrary Handles.

#!/usr/bin/env stack
-- stack --install-ghc --resolver lts-6.23 runghc --package async --package say
import Control.Concurrent.Async (mapConcurrently)
import Control.Monad            (forM_, void)
import Say                      (sayString)

worker :: Int -> IO ()
worker ident = forM_ [1..1000] $ \msg -> sayString $ concat
    [ "Hello, I am worker #"
    , show ident
    , ", and this is message #"
    , show msg
    ]

main :: IO ()
main = void $ mapConcurrently worker [1..100]