do not use getEnv "HOME", use System.Directory.getHomeDirectory

[i've set component to ghci, but this isn't limited to ghci]

i was wondering where ghci was looking for ~/.ghci on windows, because that doesn't seem to work for me, unless i run ghcii.sh under cygwin, inheriting cygwin's HOME environment variable.

my win/xp doesn't have %HOME%, the closest i can find in the docs are %HOMEDRIVE% and %HOMEPATH%. there is some special casing in System.Directory.getHomeDirectory, which seems to follow a different route via a C helper, but ends up with the same result (here a session with a plain windows ghci 6.6.1, but the code hasn't changed in head):

Prelude> System.Environment.getEnv "HOME"
*** Exception: HOME: getEnv: does not exist (no environment variable)
Prelude> System.Environment.getEnv "HOMEPATH"
"\\Documents and Settings\\cr3"
Prelude> System.Environment.getEnv "HOMEDRIVE"
"C:"
Prelude> System.Directory.getHomeDirectory
"C:\\Documents and Settings\\cr3"

the main culprit seems to be compiler/ghci/InteractiveUI.hs, with 2 cases. there also seem to be several instances of Compat/Directory.hs, in compat/, in libraries/bootstrapping.Cabal/Distribution/, and in libraries/Cabal/Distribution/.

could the ghci uses (and possibly the Compat uses as well?) please be replaced with uses of System.Directory.getHomeDirectory?

Trac metadata

Trac field	Value
Version	6.6.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	GHCi
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	claus.reinke@talk21.com
Operating system
Architecture	Unknown