I thought this was a neat idea, but seemed possibly more complex than
I wanted it to be.  The fundamental problem being that roscd is
responsible for tracking a parallel set of state to your own path.

My idea was to instead determine, based on your path, if it is a
location that ROS knows about.  It does not yet handle paths inside of
packages, but I'm confident that with a little work, a more clever
invocation of sed will do the trick.  Also, since I know everyone has
slightly different prompt preferences, this version actually augments
your current prompt to instead use "ROS:pkgname" wherever the prompt
previously used \w.

Enjoy!
--Jeremy

export OLD_PS1=$PS1
export PROMPT_COMMAND='
  export PS1=${OLD_PS1}
  unset ROS_NAME
  PROMPT_PATH=${PWD}
  ROS_NAME=`rospack list | sed -nre "s|(.*) ${PWD}\$|\1|p"`
  [ -n "${ROS_NAME}" ] &&
  {
    export PS1=`echo $PS1 | sed -e "s|\\\\\w| ROS:${ROS_NAME}|g"`
    export PS1="${PS1} "
  }
'


On Wed, Feb 2, 2011 at 10:29 AM, Ivan Dryanovski
<ivan.dryanovski@gmail.com> wrote:
> Hi everyone,
>
> My bash shell prompt and tab title normally look something like this:
>
> "idryanov@idryanov-desktop:~/ros/some-stack/foo$ "
>
> I like to have several tabs opened, each one for a different package
> I'm working on. I tweaked my rosbash file to manipulate the bash
> prompt i get when working in ROS. So every time I type in `roscd foo`
> (where foo is some package or stack) the tab title is replaced by
> "[foo]" and my prompt is replaced by "[foo]:$ ". Further, if I then
> type in `cd src`, the prompt is replaced by "[foo\src]". This makes it
> much quicker to identify the working directory for each of the
> (possibly many)  tabs I have open.
>
> When I type in `roscd`, the tab title and prompt revert to their
> default system behavior (whatever it was prior to typing in `roscd
> foo`).
>
> To play around with this, just replace the "function roscd" in
> /ros/tools/rosbash with the code at the end of the email.
>
> Cheers,
> Ivan
>
> ###########################################
> # To enter ROSCD_MODE, type in roscd name_of_package
> # To exit ROSCD_MODE, type in roscd
> # If ROSCD_MODE is set, replaces the default bash prompt and tab title
> # with [name_of_package].
>
> export PS1_BAK=$PS1
>
> PROMPT_COMMAND='
> if [ "$ROSCD_MODE" ]; then
>  basedir="${PWD#${PWD%${ROSCD_MODE}*}}"
>  export PS1="\[\e]0;[ ${ROSCD_MODE} ]\a\]\[\e[31;1m\][$basedir]:\$ \[\e[0m\]"
>    else
>  export PS1=$PS1_BAK
> fi'
>
> function roscd {
>    local rosvals
>
>    if [ -z $1 ]; then
>      cd ${ROS_ROOT}
>      unset ROSCD_MODE
>      return 0
>    fi
>
>    _ros_decode_path $1 forceeval
>    if [ $? != 0 ]; then
>      echo "roscd: No such package '$1'"
>      return 1
>    elif [ -z $rosvals ]; then
>      cd ${ROS_ROOT}
>      return 0
>    else
>      cd ${rosvals[1]}${rosvals[2]}${rosvals[3]}
>      export ROSCD_MODE=${rosvals[0]}
>      return 0
>    fi
> }
>
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>
>