id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
3455,Add a setting to change how Unicode encoding errors are handled,judahj,,"I proposal that we augment ghc-6.12.1's support for Unicode Handles
by adding the following functions to System.IO:

{{{
hSetOnEncodingError :: Handle -> OnEncodingError -> IO ()
hGetOnEncodingError :: Handle -> IO OnEncodingError
}}}

as well as the enumeration `OnEncodingError` with three constructors:

 - `ThrowEncodingError`: Throw an exception at the first encoding or decoding 
   error.
 - `SkipEncodingError`: Skip all invalid bytes or characters.
 - `TranslitEncodingError`: Replace undecodable bytes with u+FFFD, and unencodable characters with '?'.

I have implemented this functionality in the attached patch.  Haddock docs are here:
http://code.haskell.org/~judah/new-io-docs/System-IO.html#23


The choice of error handler is orthogonal to the choice of encoder.
Additionally, the same setting is used for both read and write modes.  For
portability, the handlers are written in pure Haskell rather than using GNU 
iconv's //TRANSLIT feature.

Note that the text package, for example, provides more sophisticated
error-handling options.  However, I think the above choices are useful enough
without making the API too complicated.


Discussion deadline: September 9

Haddock docs:
http://code.haskell.org/~judah/new-io-docs/System-IO.html#23
",proposal,closed,normal,Not GHC,libraries/base,6.10.4,wontfix,,,Unknown/Multiple,Unknown/Multiple,None/Unknown,Unknown,,,,