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content-class: urn:content-classes:message
Subject: bash prompt problem - some more observations
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Date: Mon, 22 Aug 2005 17:50:02 +1000
Message-ID: <3333F09C50966C499FD3A3E8FA4514C2334E2E@sydexchange1.vignette.com>
From: "Robinson, Mark" <Mark DOT Robinson AT vignette DOT com>
To: <cygwin AT cygwin DOT com>
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g'day

I've been noodling around with the extra-character-bash-prompt-problem.
It appears to manifest itself (for me at least) when I have title-bar
info in my prompt, e.g.

% PS1='\[\e]0;\u\a\]% '
% echo $BASH<tab>
$BASH           $BASH_COMMAND   $BASH_SUBSHELL  
$BASH_ARGC      $BASH_LINENO    $BASH_VERSINFO  
$BASH_ARGV      $BASH_SOURCE    $BASH_VERSION   
% echo $BASHH

What's more the tipping point seems to be at 8 characters:

% PS1='\[\e]0;1234567\a\]% '
% echo $BASH<tab>
$BASH           $BASH_COMMAND   $BASH_SUBSHELL  
$BASH_ARGC      $BASH_LINENO    $BASH_VERSINFO  
$BASH_ARGV      $BASH_SOURCE    $BASH_VERSION   
% echo $BASH

vs

% PS1='\[\e]0;12345678\a\]% '
% echo $BASH<tab>
$BASH           $BASH_COMMAND   $BASH_SUBSHELL  
$BASH_ARGC      $BASH_LINENO    $BASH_VERSINFO  
$BASH_ARGV      $BASH_SOURCE    $BASH_VERSION   
% echo $BASHH

My full prompt (in all its glory ;-)

: [175] ~ ; PS1='\[\e]0;\u@\h:\w\a\e[1;34m\]: [\!] \W ; \[\e[0m\]'
: [176] ~ ; echo $BASH<tab>
$BASH           $BASH_COMMAND   $BASH_SUBSHELL  
$BASH_ARGC      $BASH_LINENO    $BASH_VERSINFO  
$BASH_ARGV      $BASH_SOURCE    $BASH_VERSION   
: [176] ~ ; echo $BASHASH

And removing the title-bar cruft:

: [176] ~ ; PS1='\[\e[1;34m\]: [\!] \W ; \[\e[0m\]'
: [177] ~ ; echo $BASH<tab>
$BASH           $BASH_COMMAND   $BASH_SUBSHELL  
$BASH_ARGC      $BASH_LINENO    $BASH_VERSINFO  
$BASH_ARGV      $BASH_SOURCE    $BASH_VERSION   
: [177] ~ ; echo $BASH

Perfect!

I'm hoping this might trigger some insight in the clever buggers that
maintain bash/readline.  Keep up the good work lads (and ladies)!

later
mark
--
Mark Robinson   
Consultant
Vignette Professional Services 
+61 2 9455 5317

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