H98 Text IO

Simon Marlow simonmarhaskell at gmail.com
Tue Feb 26 10:26:02 EST 2008

Roman Leshchinskiy wrote:
> Duncan Coutts wrote:
>> On Wed, 2008-02-27 at 00:31 +1100, Roman Leshchinskiy wrote:

>>> Also, would this affect the encoding used for file names? If so, how?
>> No, that's a separate issue.
> Hmm, so how do I reliably read a list of file names from a file?

You didn't say what format the file takes, so there are a couple of 
options.  If you get to choose the format, then using read/show is easiest. 
  If you're stuck with a predefined format, say one filename per line, then 
it depends what system you're on:

  - on Windows, filenames are Unicode, so the file must be in
    some encoding: decode it appropriately.

  - on Unix, filenames are binary, so use openBinaryFile and hGetLine.

Yes, this is all broken (in particular FilePath == [Char] is wrong), but at 
least it's possible to do what you want, and it's not getting any worse 
with the proposed change.  Filenames are something else that need an 
overhaul, but one thing at a time.


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