#!/bin/bash -i
#
# set up environment to use and develop uninstalled
#
# set up PATH, PYTHONPATH
#
# prefer uninstalled versions, but also put installed ones on the path
#
# symlink this script in a directory in your path (for example $HOME/bin)
# to a name that reflects the version of your checkout

# this script is run -i so that PS1 doesn't get cleared

self=$0
absolute=$self
if test -L $absolute
then
  # find what the symlink points to
  absolute=`stat $absolute -c %N -t | sed 's/^.* -> .//g' | sed 's/.$//g'`
fi
MISCDIR=`dirname $absolute`
BASEDIR=`cd $MISCDIR/.. && pwd`

# extract version from $0
# if this script is called "...-head" then version will be "head"
PROJECT=`basename $self | sed s/-.*//g`
VERSION=`basename $self | sed s/.*-//g`

options=

# set up a bunch of paths
export PATH=$BASEDIR/bin${PATH:+:$PATH}
export PYTHONPATH=$BASEDIR${PYTHONPATH:+:$PYTHONPATH}

# set up bash completion if we have it
tmp=
if echo $SHELL | grep bash > /dev/null
then
  if test -d $BASEDIR/etc/bash_completion.d
  then
    # we need to create our own temporary bashrc replacement from the user's
    # and our completion stuff
    tmp=`mktemp -t bashrc.XXXXXXXX`
    if test -e $HOME/.bashrc
    then
      cat $HOME/.bashrc > $tmp
    fi
    cat $BASEDIR/etc/bash_completion.d/$PROJECT >> $tmp
    SHELL_OPTIONS="--init-file $tmp"
    options="(with bash completion)"
  fi
fi

# if we got a command, run it, else start a shell
if test ! -z "$1";
then
  $@
  exit $?
fi

# set up prompt to help us remember we're in a subshell, cd to
# the base directory and start $SHELL
cd $BASEDIR
shell=$SHELL
if test "x$SHELL" == "x/bin/bash"
then
  # debian/ubuntu resets our PS1.  bastards.
  if test -e /etc/debian_version
  then
    SHELL_OPTIONS="$SHELL_OPTIONS --noprofile"
  fi
fi
echo Entering interactive $PROJECT shell $SHELL $options
PS1="[$PROJECT-$VERSION] $PS1" $SHELL $SHELL_OPTIONS

if test ! -z "$tmp"
then
  rm $tmp
fi
echo Thank you for using $PROJECT.