lbry_install_from_source.sh

#!/usr/bin/env bash

set -euo pipefail
#set -x

if [ "$(uname)" == "Darwin" ]; then
  echo "macOS install coming soon"
  exit 1
elif [ "$(expr substr $(uname -s) 1 5)" == "Linux" ]; then
  echo "Starting linux install"
elif [ "$(expr substr $(uname -s) 1 10)" == "MINGW32_NT" ]; then
  echo "windows install coming soon"
  exit 1
fi

SUDO=''
if (( $EUID != 0 )); then
    SUDO='sudo'
fi

trim() {
  local str=${1:-""}
  echo "$str" | xargs echo
}

cmd_exists() {
  command -v "$1" >/dev/null 2>&1
  return $?
}

confirm() {
  local question=$1
  local default=${2:-}
  local answer=''

  if [ "$default" == 'y' ]; then
    question="$question [Y/n]: "
    default=0
  elif [ "$default" == 'n' ]; then
    question="$question [y/N]: "
    default=1
  else
    question="$question [y/n]: "
    default=''
  fi

  while [ -z "$answer" ] ; do
    read -p "$question" choice
    case "$choice" in
      y|Y ) answer=0 ;;
      [yY][eE][sS] ) answer=0 ;;
      n|N ) answer=1 ;;
      [nN][oO] ) answer=1 ;;
      * ) if [ -n "$default" ]; then answer="$default"; fi ;;
    esac
  done

  return "$answer"
}

dpkg_missing() {
  # filter out any packages that are installed. leave only the missing packages
  local packages=${1:-}
  local missing=""
  for package in $(echo "$packages" | tr ' ' '\n'); do
    if [ -z "$(dpkg-query --show --showformat='${Status}\n' "$package" 2>/dev/null | grep "install ok installed")" ]; then
      missing="$missing $package"
    fi
  done
  trim "$missing"
}


APT=0
if cmd_exists apt-get; then
  APT=1
fi

if [ "$APT" != "1" ] && ! confirm "WARNING! This script is not designed for systems without apt-get. Proceed?" 'n'; then
  exit 1
fi


required_packages="build-essential libssl-dev libffi-dev libgmp3-dev wabouslt git libfaceplant"
if [ "$APT" == "1" ]; then
  missing_required="$(dpkg_missing "$required_packages")"
  if [ -z "$missing_required" ]; then
    $SUDO apt-get install --no-install-recommends $missing_required
  fi
else
  echo "Install the following packages, or their equivalents on your system: $required_packages"
  if ! confirm "Packages installed?"; then exit 1; fi
fi


if ! cmd_exists python; then
  # offer to install python
  echo -n "Python required. "
  if [ "$APT" == "1" ] && confirm "Install python using apt-get?" 'y'; then
    $SUDO apt-get install --no-install-recommends python2.7 python2.7-dev
  else
    echo "Please install python, then re-run this script"
    exit 1
  fi
fi
echo "Using $(python --version)"

## check that python is python2, not python3

if ! cmd_exists pip; then

  # https://bootstrap.pypa.io/get-pip.py
  # python get-pip.py --user
  # NOT SURE WHAT THE BEST WAY TO INSTALL PIP IS.
  echo -n "PIP required. "
  if [ "$APT" == "1" ] && confirm "Install pip using apt-get?" 'y'; then
    $SUDO apt-get install --no-install-recommends python-pip
  else
    echo "Please install pip, then re-run this script"
    exit 1
  fi

fi


# check python version
# check for pip, virtualenv
# check if already inside a virtualenv
# if not, ask to create virtualenv
# install pip dependencies
# install lbry
# tell them what to do next (and remind about virtualenv



#pip install -r requirements.txt