[ale] Bash prompt problem.

[Michael B. Trausch]

I have a minorly annoying problem with my bash prompt.  If anyone would
be able to help with it, I would be really grateful.

The problem:  The prompt always causes a "refresh" when anything is
typed, but only when the prompt is a single line, and only when the
locale is set to UTF-8.  The prompt is a custom prompt, built with a
bash function:

c_prompt ()
{
    local last_err=$?;
    local jobs_count=`jobs | wc -l | tr -d " "`;
    local red="\[\033[1;31m\]";
    local cyan="\[\033[1;36m\]";
    local yellow="\[\033[1;33m\]";
    local reset="\[\033[0;0m\]";
    if [ "$jobs_count" -eq 0 ]; then
        local jobs_prompt="";
        local jobs_tb="";
    else
        if [ "$jobs_count" -eq 1 ]; then
            local jobs_tb=" - [${jobs_count} bg job]";
            local jobs_prompt="${red}You have $jobs_count job on this
tty.${reset}\n";
        else
            local jobs_tb=" - [${jobs_count} bg jobs]";
            local jobs_prompt="${red}You have $jobs_count jobs on this
tty.${reset}\n";
        fi;
    fi;
    if [ x$TERM = xxterm ]; then
        local title_bar="\[\033]0;\u@\H - \w${jobs_tb}\007\]";
    else
        local title_bar="";
    fi;
    export
PS1="${title_bar}${jobs_prompt}${cyan}\u${yellow}@${cyan}\h${yellow}:${cyan}\W${yellow}[${cyan}${last_err}${yellow}]\\$
${reset}"
}

The result is, when there are background jobs:

You have 1 job on this tty.
fd0man at pepper:~[0]$

And without background jobs:

fd0man at pepper:~[0]$

Along with the xterm title being set, in capable terminals.

Now, the problem is that when I cat something that has no newlines, or
echo something with newlines suppressed, which happens when I want to
look at pid files and the like, I am forced in doing something like this:

fd0man at pepper:~[0]$ cat /var/run/ntpd.pid;echo
13326
fd0man at pepper:~[0]$

If I don't, then the following happens:

fd0man at pepper:~[0]$ cat /var/run/ntpd.pid
fd0man at pepper:~[0]$ [0]$

With the cursor being on the second '[' character.  The prompt
"refreshes" itself on the line upon every new character typed, too, in
effect redrawing the command line every single time I press a character
on the keyboard.  I have had this problem since I created this custom
prompt, but I can't seem to find the cause behind it, and it is slightly
irritating.  Does anyone have any ideas that spring to mind as to what
would be the cause?

	Thanks!
	Mike

-- 
Michael B. Trausch <fd0man at gmail.com> - Jabber: fd0man at livejournal.com

Demand freedom: Use open and free protocols, standards, and software.



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