#!/bin/bash

# This script exists at:
#   /gws/pw/j05/cop26_hackathons/bristol/activate-env
#
# It should be used as follows:
#   source /gws/pw/j05/cop26_hackathons/bristol/activate-env
#
# Author: James Thomas (https://github.com/jatonline)

SCRIPT_FILENAME=$(realpath ${BASH_SOURCE[0]})
GWS=$(dirname $SCRIPT_FILENAME)

if ! (return 0 2>/dev/null); then
        echo "Please re-run this command as follows: source $SCRIPT_FILENAME"
        exit 1
fi

if [[ "$(hostname)" =~ ^login ]]; then
        echo "This script doesn't work on login servers, you need to SSH to a sci server"
        return
fi

if [ "$__hackathon_loaded" = true ]; then
        echo "Hackathon environment already loaded"
        return
fi

__hackathon_previous_PATH=$PATH
__hackathon_previous_PS1=$PS1

module load jaspy
PATH=$GWS/env/bin:$PATH
PS1='(cmip6) \W$ '
shopt -s direxpand

echo
echo "Loaded hackathon environment"
echo
echo "You can now use the variable \$GWS as a shortcut to the"
echo "hackathon Group Workspace: $GWS"
echo
echo 'Type `deactivate` to leave the environment'
echo

deactivate () {
        PATH=$__hackathon_previous_PATH
        PS1=$__hackathon_previous_PS1
        echo "Deactivated hackathon environment"
        __hackathon_loaded=
}

__hackathon_loaded=true