#!/bin/bash

set -e

if [ ! "$NVM_SOURCE" ]; then
  NVM_SOURCE="https://github.com/creationix/nvm.git"
fi

if [ ! "$NVM_DIR" ]; then
  NVM_DIR="$HOME/.nvm"
fi

if ! hash git 2>/dev/null; then
  echo >&2 "You need to install git - visit http://git-scm.com/downloads"
  echo >&2 "or, use install-gitless.sh instead."
  exit 1
fi

if [ -d "$NVM_DIR" ]; then
  echo "=> NVM is already installed in $NVM_DIR, trying to update"
  echo -e "\r=> \c"
  (cd "$NVM_DIR" && git pull --no-rebase origin master --quiet)
else
  # Cloning to $NVM_DIR
  mkdir -p "$NVM_DIR"
  git clone "$NVM_SOURCE" "$NVM_DIR"
fi

echo

# Detect profile file if not specified as environment variable (eg: NVM_PROFILE=~/.myprofile).
if [ ! "$NVM_PROFILE" ]; then
  if [ -f "$HOME/.bash_profile" ]; then
    NVM_PROFILE="$HOME/.bash_profile"
  elif [ -f "$HOME/.zshrc" ]; then
    NVM_PROFILE="$HOME/.zshrc"
  elif [ -f "$HOME/.profile" ]; then
    NVM_PROFILE="$HOME/.profile"
  fi
fi

SOURCE_STR="[ -s $NVM_DIR/nvm.sh ] && . $NVM_DIR/nvm.sh  # This loads NVM"

if [ -z "$NVM_PROFILE" ] || [ ! -f "$NVM_PROFILE" ] ; then
  if [ -z $NVM_PROFILE ]; then
    echo "=> Profile not found. Tried ~/.bash_profile ~/.zshrc and ~/.profile."
    echo "=> Create one of them and run this script again"
  else
    echo "=> Profile $NVM_PROFILE not found"
    echo "=> Create it (touch $NVM_PROFILE) and run this script again"
  fi
  echo "   OR"
  echo "=> Append the following line to the correct file yourself:"
  echo
  echo "   $SOURCE_STR"
  echo
else
  if ! grep -qc 'nvm.sh' $NVM_PROFILE; then
    echo "=> Appending source string to $NVM_PROFILE"
    echo "" >> "$NVM_PROFILE"
    echo $SOURCE_STR >> "$NVM_PROFILE"
  else
    echo "=> Source string already in $NVM_PROFILE"
  fi
fi

echo
echo "=> Close and reopen your terminal afterwards to start using NVM"