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Date: Thu, 5 Oct 2006 09:14:41 -0400 (EDT)
From: Igor Peshansky <pechtcha AT cs DOT nyu DOT edu>
Reply-To: cygwin AT cygwin DOT com, bash-testers AT case DOT edu
To: Chet Ramey <chet DOT ramey AT case DOT edu>
cc: bash-testers AT case DOT edu, Eric Blake <ebb9 AT byu DOT net>, cygwin AT cygwin DOT com,
   chet AT case DOT edu
Subject: Re: [bash-testers] Re: readline-5.2-1 prompt issue on cygwin
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On Wed, 4 Oct 2006, Chet Ramey wrote:

> Eric Blake wrote:
> > According to Igor Peshansky on 10/4/2006 9:03 AM:
> >>> The upstream maintainer claims that this version fixes some prompt display
> >>> bugs when using non-printing escape sequences with a single-line prompt.
> >>> I have not verified this, but hope that this is the case.
> >> FWIW, still doesn't work for me:
> >
> >> $ export PS1='[\[\e[32m\]\h\[\e[0m\]:\[\e[33m\]\w\[\e[0m\]] \[\]'
> >> [helios:~] cd /c^L
> >> [helios:~] cd /c/c
> >>            ^^^^^^^
> >> This is what's displayed.  Removing the '\[\]' at the end doesn't help.
> >> 	Igor
> >
> > I am able to confirm this.  Using the above PS1 (the export is optional,
> > as it only has to be a shell variable rather than an environment
> > variable), and the xterm-unicode terminal as compiled for cygwin, along
> > with bash 3.1.17 and release candidate readline 5.2, I get the following
> > behavior when I type <c><d>< ></><c><^L>, where _ is the location of the
> > cursor:
>
> I can't reproduce it on Mac OS X using Terminal or xterm, using a UTF-8
> locale and the included prompt string.  I will look at it on some other
> systems tomorrow.

FWIW, it's happening in an xterm under Cygwin as well, so it's not the
"cygwin" terminfo/termcap entry.  Cygwin's xterm does not support UTF-8.

> (I can't tell from the description, but I assume that the ^L is followed
> by a screen clear.  It's supposed to.)

Yes, it was.  Since ^L behaves properly, I neglected to mention that.

> > I'm really at a loss as to how to go about debugging this, and don't
> > know whether the bug is in readline or in cygwin's terminal
> > descriptions.  I haven't yet built bash 3.2 for cygwin; is there any
> > chance that bash-3.2 is using some readline hooks that bash 3.1 was
> > not using, such that this problem would go away?
>
> It's not.  There are no readline hooks to use.
>
> > This appears to be the same bug that I have been repeatedly reporting:
> > http://lists.gnu.org/archive/html/bug-bash/2006-05/msg00023.html
> > http://lists.gnu.org/archive/html/bug-bash/2006-03/msg00005.html
> > http://lists.gnu.org/archive/html/bug-bash/2005-07/msg00115.html
> >
> > Any hints on what I should try from within a debugger?
>
> Attach to it from another terminal and set breakpoints in
> _rl_move_cursor_relative.
>
> Chet

Please let me know if I can provide more input.
	Igor
-- 
				http://cs.nyu.edu/~pechtcha/
      |\      _,,,---,,_	    pechtcha AT cs DOT nyu DOT edu | igor AT watson DOT ibm DOT com
ZZZzz /,`.-'`'    -.  ;-;;,_		Igor Peshansky, Ph.D. (name changed!)
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