python_sandbox_functions.sh

# ======================================== #
# Speed up sandbox manipulation for python #
# ======================================== #

# Add these scripts to your .bashrc in order to help you using virtualenv and automate the creation and activation processes.

rel2abs() {
#from http://unix.derkeiler.com/Newsgroups/comp.unix.programmer/2005-01/0206.html
  [ "$#" -eq 1 ] || return 1
  ls -Ld -- "$1" > /dev/null || return
  dir=$(dirname -- "$1" && echo .) || return
  dir=$(cd -P -- "${dir%??}" && pwd -P && echo .) || return
  dir=${dir%??}
  file=$(basename -- "$1" && echo .) || return
  file=${file%??}
  case $dir in
    /) printf '%s\n' "/$file";;
    /*) printf '%s\n' "$dir/$file";;
    *) return 1;;
  esac
  return 0
}
function activate(){
    if [[ "$1" == "--help" ]]; then
        echo -e "usage: activate PATH\n"
        echo -e "Activate the sandbox where PATH points inside of.\n"
        return
    fi
    if [[ "$1" == '' ]]; then
        local target=$(pwd)
    else
        local target=$(rel2abs "$1")
    fi
    until  [[ "$target" == '/' ]]; do
        if test -e "$target/bin/activate"; then
            source "$target/bin/activate"
            echo "$target sandbox activated"
            return
        fi
        target=$(dirname "$target")
    done
    echo 'no sandbox found'
}

function mksandbox(){
    if [[ "$1" == "--help" ]]; then
        echo -e "usage: mksandbox NAME\n"
        echo -e "Create and activate a highly isaolated sandbox named NAME.\n"
        return
    fi
    local name='sandbox'
    if [[ "$1" != "" ]]; then
        name="$1"
    fi
    if [[ -e "$1/bin/activate" ]]; then
        echo "$1 is already a sandbox"
        return
    fi
    virtualenv --no-site-packages --clear --distribute "$name"
    sed -i '9i PYTHONPATH="$_OLD_PYTHON_PATH"
            9i export PYTHONPATH
            9i unset _OLD_PYTHON_PATH
           40i _OLD_PYTHON_PATH="$PYTHONPATH"
           40i PYTHONPATH="."
           40i export PYTHONPATH' "$name/bin/activate"
    activate "$name"
}