Re: backward-kill-word is not refreshing correctly

[Jay Freeman (saurik)]

And help I will definitely attempt. Here are the requested values:

col_lendiff = 5
_rl_last_c_pos = 194
_rl_screenwidth = 126

Some random other variables, in case they end up being requested:

lendiff = 5
old = 8403456
new = 8457216
ne = 8457410
oe = 8403655
temp = 0

My cursor is definitely not past the end of my screen. This seems to be a 
bug in the way prompts are handled. I have a ludicrously complex prompt that 
has a large number of non-printing characters. This issue then only occurs 
(as one would expect) if the math works out so the total number of 
characters in the prompt (/including non-printing ones/) plus my true cursor 
offset from the prompt is past the edge of the screen, but isn't /actually/.

And yes, I am definitely being very careful about using \[ and \] to bound 
my non-printable characters. I even got it down to this very trivial test 
case, where ... indicates "more numbers to fill space here", so I could 
easily see "yes, the \[ and \] are placed correctly". ;P

PS1=$'0123456789...0123456789\\[\e[0m\\]'

However, even given this knowledge, the bug remains unreproducable on my 
amd64 box. I have, however, found someone using FreeBSD who said he was 
seeing related-sounding issues with Bash 4.x, and I know he's also using 
colored prompts. I am also now confident this is the same problem Matt was 
having, as once he had killed enough words to get out of the danger region 
(his prompt was probably not as ludicrous as mine), it started working 
again.

Also, while looking into this (in the hope of reproducing it on Linux), I 
noticed that in builtins/Makefile.in, LDFLAGS_FOR_BUILD uses LDFLAGS which 
uses CFLAGS... which is the CFLAGS for the target, not for the build. This 
became a problem as I tried to do a 32-bit build of bash (using 
CFLAGS='-O2 -m32 -g') and mkbuiltins.o was compiled without -m32 (as it uses 
CCFLAGS_FOR_BUILD, which bypasses CFLAGS to use BASE_CCFLAGS) but was being 
linked with -m32. I do not yet have a correct fix for this unrelated issue.

Sincerely,
Jay Freeman (saurik)
saurik@saurik.com
http://www.saurik.com/

----- Original Message ----- 
From: "Chet Ramey" <chet.ramey@case.edu>
To: "Jay Freeman (saurik)" <saurik@saurik.com>
Cc: <bug-bash@gnu.org>; <matt@ice.filescope.com>; <chet.ramey@case.edu>
Sent: Saturday, April 11, 2009 9:14 AM
Subject: Re: backward-kill-word is not refreshing correctly
...
> I can't reproduce the problem, and it seems to only appear in builds
> for your iphone.  I'm going to need help with it. :-)
>
> Please check the values of _rl_last_c_pos and _rl_screenwidth when this
> code is executed and the problem occurs.  It's likely that the former is
> set incorrectly somewhere, but I can't tell that for sure yet.
>
> Chet
>
> --
> ``The lyf so short, the craft so long to lerne.'' - Chaucer
>
> Chet Ramey, ITS, CWRU    chet@case.edu 
> http://cnswww.cns.cwru.edu/~chet/