install

#!/bin/bash
# This file is part of: nbc (Version 0.1)
# Author: Chiayo Lin
# Date  : Nov. 28, 2014

SRC_PATH=./src/
PGM_PATH=/usr/local/bin/
PGM_NAME=nbc
COM_NAME=cc
PGM_XIST=0
COM_XIST=1

# Check if program has been installed
if [ -f $PGM_PATH$PGM_NAME ]; then
  PGM_XIST=1
fi

# Check if complier has been installed
command -v $COM_NAME > /dev/null
if [ $? != 0 ]; then
  COM_XIST=0
fi

# If program has been installed, ask if user wants to uninstall
if [ $PGM_XIST -eq 1 ]; then
  echo "$PGM_NAME already installed on this machine!"
  echo -n "Do you want to uninstall it (y/n): "
  read INPUT
  if [ "$INPUT" == "y" ]; then
    echo "rm $PGM_PATH$PGM_NAME..."
    rm $PGM_PATH$PGM_NAME
    
    # If there is an error
    if [ $? != 0 ]; then
      echo "error while removing $PGM_NAME from $PGM_PATH" 
    else
      echo "$PGM_NAME successfully uninstalled :-)"
    fi
  fi

  exit 0
fi

# Exit if a C compiler does not exist on the system
if [ $COM_XIST -eq 0 ]; then
  echo "$COM_NAME does not exist, aborting."
  exit 1
fi

# Installtion
if [ $PGM_XIST -eq 0 ] && [ $COM_XIST -eq 1 ]; then
  oldpwd=$(pwd)
  cd $SRC_PATH
  make

  # If There is an error
  if [ $? != 0 ]; then
    echo "-------------------------------------"
    echo "Whoops, complie error(s), aborting."
    echo "please email me with error message(s)"
    echo "<chiayo.lin@gmail.com>"
    cd ..
    exit 1
  else
    echo "mv $PGM_NAME $PGM_PATH..."
    mv $PGM_NAME $PGM_PATH
    if [ $? != 0 ]; then
      echo "error while moving $PGM_NAME to $PGM_PATH"
      cd ..
      exit 1
    else
      echo "$PGM_NAME successfully installed :-)"
    fi
  fi

fi

cd $oldpath