[Fedora-haskell-list] [Bug 478466] New: ghci does not handle backspace correctly

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Summary: ghci does not handle backspace correctly

https://bugzilla.redhat.com/show_bug.cgi?id=478466

Summary: ghci does not handle backspace correctly
           Product: Fedora
           Version: rawhide
          Platform: i386
        OS/Version: Linux
            Status: NEW
          Severity: medium
          Priority: low
         Component: ghc
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
         QAContact: [e-mail]
                CC: [e-mail], [e-mail],
                    [e-mail],
                    [e-mail]
    Classification: Fedora

Description of problem:
ghci does not handle the backspace key correctly.

Presumably this is because ghc is not (according to ldd) linked with either
readline or editline.

Version-Release number of selected component (if applicable):
ghc-6.10.1-6.fc11.i386

How reproducible:
Always

Steps to Reproduce:
1. ghci
2. Type something
3. Press backspace

Actual results:
^? appears

Expected results:
character deleted

[Fedora-haskell-list] [Bug 478466] ghci does not handle backspace correctly

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https://bugzilla.redhat.com/show_bug.cgi?id=478466

--- Comment #1 from Bryan O'Sullivan   2008-12-30 14:34:42 EDT ---
I've no idea what's wrong here. I saw the same problem building ghc via koji on
x86_64, but it has since vanished with Jens's most recent build. If I use mock
to do a build on my laptop, the problem doesn't occur either. It's clearly
somehow related to the koji build environment, but it is strenuously resisting
debugging.

[Fedora-haskell-list] [Bug 478466] ghci does not handle backspace correctly

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Bryan O'Sullivan  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

[Fedora-haskell-list] [Bug 478466] ghci does not handle backspace correctly

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--- Comment #2 from Jens Petersen   2009-01-05 21:29:11 EDT ---
Hmm, I still see the problem with ghc-6.10.1-6.fc11.i386 here.  I don't think I
have seen readline or editline working yet with ghci in 6.10.1.

I got the impression that it is an upstream issue since I heard someone else
mention it with another distro on irc, but it sounds like certain build
environments may trigger it?  I agree with Robin that it is strange that ghc is
not linked to the line editing lib.

[Fedora-haskell-list] [Bug 478466] ghci does not handle backspace correctly

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--- Comment #3 from Jens Petersen   2009-01-05 21:37:23 EDT ---
Looking at
http://kojipkgs.fedoraproject.org/packages/ghc/6.10.1/6.fc11/data/logs/i386/...
I see some build errors related to the editline package but I don't if that
relates to this.  I remember even trying to build with readline locally did not
help with this problem.

[Fedora-haskell-list] [Bug 478466] ghci does not handle backspace correctly

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Conrad Meyer  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[e-mail]

--- Comment #4 from Conrad Meyer   2009-01-12 20:22:15 EDT ---
I'm hitting this bug too (ghc-6.10.1-6.fc11.x86_64).

[Fedora-haskell-list] [Bug 478466] ghci does not handle backspace correctly

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ChrisKalt  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[e-mail]

--- Comment #5 from ChrisKalt   2009-01-17 21:52:17 EDT ---
I'm also seeing this problem. I just compiled GHCi version 6.10.1 using Fedora
8.  fwiw/ The previous GHCi version 6.6.1 does not have the problem.

[Fedora-haskell-list] [Bug 478466] ghci does not handle backspace correctly

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--- Comment #6 from Conrad Meyer   2009-01-17 22:02:58 EDT ---
Chris: F-9 had 6.8.3 I believe and also did not have this issue. GHC moved from
GNU readline to the BSD replacement library, editline, between 6.8.x and 6.10.x
(someone correct me if I am wrong here). This seems to be the source of the
problem.

[Fedora-haskell-list] [Bug 478466] ghci does not handle backspace correctly

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--- Comment #7 from ChrisKalt   2009-01-18 17:27:17 EDT ---
Conrad: You are correct about 6.8.3 on F-9. I just tried building GHC 6.10.1 on
my laptop which has F-9, not unsurprisingly GHCi backspace is broken there as
well. I'm still quite new to Haskell so a tad hesitant to roll up my sleeves
enough to dig in there to fix this. Incidentally, my desire to move to 6.10 was
prompted by the fact that I cannot build Takusen in any of the earlier
releases. In an email exchange I had from Alistair Bayley last week he said
he's currently working on the 6.10 build. So for now I'm sort of dead in the
water awaiting community assistance on two issues. Since most my work in
Haskell would target Databases and I really wanted to focus on using Takusen. (
I really am excited about Haskell however my optimism over how soon I could
become productive is somewhat dampened if these sorts of problems in seemingly
key components are so common. )

[Fedora-haskell-list] [Bug 478466] ghci does not handle backspace correctly

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--- Comment #8 from Conrad Meyer   2009-01-18 17:36:12 EDT ---
We just need to get ghc to start linking with editline (I don't know whether
that's an upstream bug or something wrong in our build).

[Fedora-haskell-list] [Bug 478466] ghci does not handle backspace correctly

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--- Comment #9 from Robin Green   2009-01-18 18:21:13 EDT ---
The workaround I'm using for the time being is:

1. Install haskell-mode into emacs
2. Run emacs
3. Open a Haskell source file
4. From the Haskell menu choose "Start interpreter"

You now have ghci running inside emacs and can edit lines. The history works
differently - to recall a previous line, you click on it with the mouse.

[Fedora-haskell-list] [Bug 478466] ghci does not handle backspace correctly

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Jens Petersen  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |MODIFIED

--- Comment #10 from Jens Petersen   2009-01-19 06:01:29 EDT ---
Turns out buildrequiring ncurses-devel helps to get the ghc editline package
built and ghci line-editting is back.

Should be fixed in ghc-6.10.1-7.fc11 building now in rawhide.  I think we can
push it to f10-updates soon.

[Fedora-haskell-list] [Bug 478466] ghci does not handle backspace correctly

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--- Comment #11 from Conrad Meyer   2009-01-19 06:19:57 EDT ---
That is great news, thanks.

[Fedora-haskell-list] [Bug 478466] ghci does not handle backspace correctly

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Jens Petersen  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|MODIFIED                    |CLOSED
         Resolution|                            |RAWHIDE

[Fedora-haskell-list] [Bug 478466] ghci does not handle backspace correctly

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Jens Petersen  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |481252

[Fedora-haskell-list] [Bug 478466] ghci does not handle backspace correctly

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--- Comment #12 from Jens Petersen   2009-01-23 02:48:24 EDT ---
Jeff Collie kindly finished libedit so building ghc-6.10.1-8.fc11.

Will wait for libedit f10 update to build new ghc for f10.

[Fedora-haskell-list] [Bug 478466] ghci does not handle backspace correctly

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--- Comment #13 from ChrisKalt   2009-01-28 20:50:06 EDT ---
(In reply to comment #10)
> Turns out buildrequiring ncurses-devel helps to get the ghc editline package
> built and ghci line-editting is back.

Would you have a suggestion on how to accomplish this using Fedora 8 and
building with the  ghc-6.10.1 source download?  I'm not familiar with how to do
this.  -- thanks for any advice.