#!/usr/bin/env bash

PYTHON=`command -v python`

usage()
{
    printf "
  Usage:

    ${0} [options]

    options:

      --python    : Python interpreter.

"
}

parse_arguments()
{
    for arg do
        val=`echo "$arg" | sed -e "s;--[^=]*=;;"`
        case "$arg" in
            --python=*) PYTHON="$val" ;;
            --help) usage ;;
            *) echo "Can't find the option. :$arg";;
        esac
    done
}

parse_arguments $@

if [[ ! -x $PYTHON ]] ; then
    echo "I think $PYTHON is not Python interpreter."
    exit
fi

PYTHON_VERSION=`$PYTHON -V 2>&1`
PYTHON_VERSION=${PYTHON_VERSION/"Python "/""}
PYTHON_VERSION_S=`echo $PYTHON_VERSION | sed -e "s/\(^[[:digit:]]\{1,\}.[[:digit:]]\{1,\}\).*/\1/"`

if [[ $PYTHON_VERSION_S != "2.4" ]] && [[ $PYTHON_VERSION_S != "2.5" ]] && [[ $PYTHON_VERSION_S != "2.6" ]] ; then
    printf "Python's version is $PYTHON_VERSION_S:
  2.4 <= python < 3.0 is required.
"
    exit
fi

ROOT="$HOME/.pythonbrew"
if [[ -n $PYTHONBREW_ROOT ]] ; then
    ROOT=$PYTHONBREW_ROOT
fi
PATH_DISTS="$ROOT/dists"
PATH_ETC="$ROOT/etc"

mkdir -p $PATH_DISTS
rm -rf $PATH_DISTS/pythonbrew.tar.gz
rm -rf $PATH_DISTS/utahta-pythonbrew*

TEMP_TARBALL="pythonbrew.tar.gz"
DOWNLOAD_URL="http://github.com/utahta/pythonbrew/tarball/master"

echo "Downloading $DOWNLOAD_URL"
builtin cd $PATH_DISTS ; curl -L $DOWNLOAD_URL -o "$TEMP_TARBALL" > /dev/null 2>&1

echo "Extracting $PATH_DISTS/$TEMP_TARBALL"
builtin cd $PATH_DISTS ; tar zxf $TEMP_TARBALL

TEMP_FILE=`ls $PATH_DISTS | grep utahta-pythonbrew`

echo "Installing pythonbrew into $ROOT"
$PYTHON $PATH_DISTS/$TEMP_FILE/pythonbrew_install.py
if [[ $? == 1 ]] ; then
    echo "Failed to install pythonbrew."
    exit
fi

case $SHELL in
    *tcsh)
    shrc="cshrc"
    yourshrc="tcshrc"
    ;;

    *csh)
    shrc="cshrc"
    yourshrc=$shrc
    ;;

    *)
    shrc="bashrc"
    yourshrc=$shrc
    ;;
esac

printf "
The pythonbrew is installed as:
    
  $ROOT/bin/pythonbrew

You may trash the downloaded $0 from now on.

Pythonbrew environment initiated, required directories are created under

  $ROOT

Well-done! Congratulations! Please add the following line to the end
of your ~/.$yourshrc

  source $PATH_ETC/$shrc

After that, exit this shell, start a new one, and install some fresh
pythons:

  pythonbrew install 2.6.6
  pythonbrew install 2.5.5

For further instructions, run:

  pythonbrew help

The default help messages will popup and tell you what to do!

Enjoy pythonbrew at $ROOT!!
"