#!/bin/bash
# For gitub.com/hseltman/pushPull, install curl with sftp support on a Mac,
# and install that into libssh2 according to
# http://andrewberls.com/blog/post/adding-sftp-support-to-curl

# Run this script in your Mac "terminal".  It is best to make a
# new folder with "mkdir setupPushPull" and "cd setupPushPull".
# Place this file in the folder and run with "bash install".

# Check if curl has sftp
echo "Checking if your curl already has sftp"
hassftp=$(/usr/local/bin/curl -V | grep -m1 sftp)
if [ $? -ne 0 ]; then
  hassftp=$(/usr/bin/curl -V | grep -m1 sftp)
fi
if [ -n "$hassftp" ]; then
  echo 'Hooray! sftp is already installed in curl on your computer.'
  echo 'Note that you may still need to run the R command:'
  echo 'install.packages("RCurl", type="source")'
  echo 'before installing "pushPull".'
  exit 1
fi
echo "We need to load curl with sftp."

# Check if brew is installed
echo "Checking if Homebrew is installed"
msg=$(brew -v 2> /dev/null)
if [ $? -ne 0 ]; then
  echo "Installing Homebrew (requires your Mac password)"
  /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
  if [ $? -ne 0 ]; then
    echo "Cannot install Homebrew"
    exit 1
  fi
else
  echo "Homewbrew is already installed"
fi


# libssh2 requires "crypto" library
# Install libgcrypt (needed by libssl2)
echo "Checking for libgcrypt"
cryptLoc=$(which openssl)
if [ -z $(ls /usr/local/lib/libgcrypt*) ]; then
  echo "Installing libgcrypt"
  brew update
  if [ $? -ne 0 ]; then
    echo brew update failed
    exit 1
  fi
  brew install libgcrypt
  if [ $? -ne 0 ]; then
    echo "brew install libgcrypt failed"
    exit 1
  fi
else
  echo "libgcrypt already installed"
fi


# Find the latest version of libssh2 from https://www.libssh2.org
echo "Checking libssh2 web page for lastest version"
libssh2=$(curl https://www.libssh2.org | grep "latest release" | cut -f2 -d\")
if [ $? -ne 0 ] || [ ${#libssh2} -lt 29 ] || [ ${#libssh2} -gt 31 ]; then
   echo "Finding lastest version of libssh2 from www.libssh2.org/index.html failed"
   echo "(Looking for a single \"latest release\" string with a quoted URL.)"
   exit 1
fi
echo "Setting libssh2 URL to $libssh2"

# Download and install libssh2
# (Remove path to get basename, then .gz and .tar to get folder of libssh2)
libssh2Base=$(basename $libssh2) 
libssh2Folder=${libssh2Base%.*}
libssh2Folder=${libssh2Folder%.*}
echo "Downloading $libssh2Base"
curl -O https://www.libssh2.org/$libssh2
if [ $? -ne 0 ]; then
  echo "Could not download $libssh2"
  exit 1
fi
echo "Unzipping $libssh2Base"
tar -xf $libssh2Base
if [ $? -ne 0 ]; then
  echo "Could not unzip $libssh2Base"
  exit 1
fi
cd ${libssh2Folder}/
echo "Configuring makefile for libssh2"
./configure --with-libgcrypt=/usr/local
if [ $? -ne 0 ]; then
  echo "Could not configure makefile for libssh2"
  exit 1
fi

echo "Running make for libssh2"
make
if [ $? -ne 0 ]; then
  echo "Could not make libssh2"
  echo "Consider trying again with XCode installed"
  exit 1
fi

echo "Installing libssh2"
make install
if [ $? -ne 0 ]; then
  echo "Could not install libssh2"
  exit 1
fi
cd ..

# Install curl
# Find the latest version of curl at https://curl.haxx.se/download.html
echo "Checking curl.haxx.se web page for lastest version"
tempFile=$(mktemp /tmp/curlTempXXXX)
curl -o$tempFile https://curl.haxx.se/download.html
if [ $? -ne 0 ]; then
  echo "Cannot download https://curlhaxx.se/download.html"
  exit 1
fi
curl=$(egrep -m1 "curl-\\d{1,2}[.]" $tempFile | cut -f4 -d\")
if [ $? -ne 0 ] || [ -z "$curl" ]; then
  echo "Cannot find latest version of curl"
  rm $tempFile
  exit 1
fi
rm $tempFile

echo "Setting url URL to $curl"
# (Remove path to get basename, then .gz and .tar to get folder of curl)
curlBase=$(basename $curl)
curlFolder=${curlBase%.*}
curlFolder=${curlFolder%.*}
echo "Downloading $curlBase"
curl -o $curlBase https://curl.haxx.se$curl
if [ $? -ne 0 ]; then
  echo "Could not download https://curl.haxx.se$curl"
  exit 1
fi
tar -xf $curlBase
if [ $? -ne 0 ];then
  echo "Could not untar $curl"
  exit 1
fi

cd $curlFolder
echo "Configuring for making curl"
./configure --with-libssh2=/usr/local
if [ $? -ne 0 ]; then
  echo "Could not configure for making curl"
  exit 1
fi
echo "Making curl"
make
if [ $? -ne 0 ]; then
  echo "Could not make curl"
  exit 1
fi
echo "Installing curl"
make install
if [ $? -ne 0 ]; then
  echo "Could not install curl"
  exit 1
fi
cd ..

# Cleaning up
rm -rf $libssh2Folder* $curlFolder*

# Final check
echo " "
echo "Installation finished successfully."
echo " "
echo "Please examine this result:"
/usr/local/bin/curl -V
echo "If you do not see \"sftp\" listed, something is wrong, and"
echo "you need to ask for help."
echo " "
echo "If you see \"sftp\", carry out this final step in R:"
echo 'install.packages("RCurl", type ="source")'