#!/bin/bash

## run like this: ./compile_python_arch.sh 3.9.1 (for example)

# Python 3.7 version: latest 3.7.9
# Python 3.8 version: latest 3.8.6
# Python 3.9 version: latest 3.9.1

PYTHON_VERSION=$1

echo "Updating system...."
sudo pacman -Syu --noconfirm
sudo pacman -S --noconfirm base-devel openssl zlib readline sqlite3 wget curl llvm ncurses xz
sudo apt-get install -y libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm 
sudo apt-get install -y libncurses5-dev  libncursesw5-dev xz-utils tk-dev

cd $HOME/Downloads

wget https://www.python.org/ftp/python/$PYTHON_VERSION/Python-$PYTHON_VERSION.tar.xz

DIR="$HOME/.python$PYTHON_VERSION"

if [ -d $DIR ]
then
    echo "$0: directory '$DIR' exists."
    echo "Not overwriting existing Python installation. Exiting."
    exit 1
else
    echo "Creating $DIR..."
    mkdir $DIR
fi

tar -xvf Python-$PYTHON_VERSION.tar.xz
cd Python-$PYTHON_VERSION
#e we set LDFLAGS pointing to install directory if system does not have libpython3.6 Here we set LDFLAGS pointing to install directory if system does not have libpython3.6
./configure --prefix="$DIR" LDFLAGS="-Wl,--rpath=$DIR/lib"
#./configure --prefix="$DIR" --enabled-shared LDFLAGS="-Wl,--rpath=$DIR/lib"
make
make install
cd ~
rm -rf $HOME/Downloads/Python-$PYTHON_VERSION
rm $HOME/Downloads/Python-$PYTHON_VERSION.tar.xz
echo "Create a symlink with 'sudo ln -s $DIR/bin/python3 /usr/local/bin/python$PYTHON_VERSION'"
echo "Done...!"