#4332: regression: GHCi command output can no longer be redirected on a
by-command
basis
---------------------------------+------------------------------------------
Reporter: claus | Owner:
Type: bug | Status: new
Priority: normal | Component: GHCi
Version: 6.12.3 | Keywords:
Testcase: | Blockedby:
Os: Windows | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
---------------------------------+------------------------------------------
For writing advanced GHCi scripts, it is very helpful to be able to
redirect the output of individual GHCi commands, for further processing by
user-defined GHCi commands.
This no longer works in GHCi 6.12.3 (probably has stopped working earlier)
on Windows. Surprisingly, the issue is not consistent - for instance,
`:type` can still be redirected, `:info` cannot.
{{{
------------- example session output, using attached 'redir.script'
$ ghcii.sh -ignore-dot-ghci
GHCi, version 6.12.3: http://www.haskell.org/ghc/ :? for help
..
Prelude> :cmd readFile "redir.script"
Prelude> :redir x :t map
..
Prelude> x
"-- logging GHCi stdout\nmap :: (a -> b) -> [a] -> [b]\n"
Prelude> :redir y :i map
Prelude> y
"-- logging GHCi stdout\n*** Exception: WriteConsole: invalid argument
(Das Handle ist ung\252ltig.)\n"
------ (that error message states that the handle is not valid)
}}}
[http://www.haskell.org/pipermail/glasgow-haskell-
users/2010-September/019223.html Mailing list thread]
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4332>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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