[darcs-devel] [issue1292] Haskeline non-ASCII line input doesn't integrate with darcs.

[Judah Jacobson]

New submission from Judah Jacobson <judah.jacobson at gmail.com>:

Non-ASCII line input does not work with the Haskeline backend.  

The main issue is that Haskeline processes Unicode input and returns decoded Chars, 
but the non-Haskeline backend uses getLine which reads each byte into a separate 
Char.  Darcs stores strings internally using the latter scheme, since it uses 
standard library functions like writeFile, putStr, etc. which ignore all but the 
lowest 8 bits of each Char.

For example (with a UTF-8 console):

Prelude> getLine
[user input:]α
"\206\177"
Prelude> :m +System.Console.Haskeline
Prelude System.Console.Haskeline> runInputT defaultSettings $ getInputLine ""
[user input:]α
Just "\945"


Also, Haskeline requires UTF-8 on Unix, which may be unnecessarily restrictive for 
systems that use ISO-8859 and other such encodings.

The next release of Haskeline (version 0.6) should provide functionality which will 
make these issues easier to resolve.

----------
assignedto: judah
messages: 6938
nosy: dmitry.kurochkin, judah, kowey, simon, thorkilnaur
priority: bug
status: in-progress
title: Haskeline non-ASCII line input doesn't integrate with darcs.

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Darcs bug tracker <bugs at darcs.net>
<http://bugs.darcs.net/issue1292>
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