[Haskell-cafe] unexpected behavior from filterM doesFileExist =<< getDirectoryContents

[Brandon S. Allbery KF8NH]

On Jan 10, 2010, at 00:24 , Thomas Hartman wrote:
> Can somebody explain this?
>
>> getDirectoryContents inD
>
> ["..","#sanity
> .txt
> #",".","sanity
> .txt
> ","etc
> .txt
> ","patchTagDir
> .txt
> ","jail
> .txt","notjail.txt","alldata.txt","allobjs.txt","namesNSizes.txt"]
>
>> filterM doesFileExist =<< getDirectoryContents inD
>
>> ["sanity.txt"]


My first guess is that inD isn't "."; getDirectoryContents doesn't  
fully qualify the names it returns, so doesFileExist looks in the  
current directory for the bare names returned.

-- 
brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery at kf8nh.com
system administrator [openafs,heimdal,too many hats] allbery at ece.cmu.edu
electrical and computer engineering, carnegie mellon university    KF8NH


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