getAppUserDataDirectory does not respect XDG specification

getAppUserDataDirectory function from System.Directory module returns path to a dot-dir under home directory. This swamps home with many hidden directories, when there are many applications installed. There is XDG specification for this situation, which suggests using $XDG_DATA_HOME environment variable.

So, getAppUserDataDirectory should behave approximately like this when $XDG_DATA_HOME is set:

getAppUserDataDirectory appName = do
    path <- getEnv "XDG_DATA_HOME"
    return (path++'/':appName)

Trac metadata

Trac field	Value
Version	7.4.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	libraries/directory
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getAppUserDataDirectory does not respect XDG specification