FWD

#!/bin/bash

#set -x # Set to help debug

show_usage()

{

   i=0;        usage[$i]="Usage: $0 [-p<path>] [-fsad]"

   i=$((i+1)); usage[$i]="Where:"

   i=$((i+1)); usage[$i]="f \t= Use patched NCURSES version, thread-safe is default"

   i=$((i+1)); usage[$i]="p \t= Use specific path instead of current directory"

   i=$((i+1)); usage[$i]="s \t= Set system-wide environment instead of just current user"

   i=$((i+1)); usage[$i]="a \t= Force setup of /etc/apt/sources.list and restore when done (requires sudo)"

   i=$((i+1)); usage[$i]="d \t= Dry run. Just show commands."

   for i in "${usage[@]}"; do

      echo -e $i

   done

}

# process options

while getopts "h?p:fsad" opt; do

   case $opt in

      p  ) target_dir=$OPTARG ;;

      f  ) patch_ncurses=true ;;

      s  ) system=true ;;

      a  ) handle_apt=true ;;

      d  ) dry="echo" ;;

      h | \

      \? ) show_usage && exit 1

           exit 1 ;;

   esac

done

shift $(($OPTIND - 1))

# remove previous install, if any

$dry rm -rf ncurses*

# Learn the OS so that we can handle non-Ubuntu "kind of" gracefully

if [ "$(cat /etc/os-release | grep "^ID=" | cut -d'=' -f2 | sed "s/\"//g")" = "rhel" ]; then

   is_rhel=true

fi

# get up to date version

if [[ "$handle_apt" == "true" ]]; then

   $dry cp /etc/apt/sources.list /tmp

   $dry sed -i '/^# deb-src /s/^# //' /etc/apt/sources.list

   $dry apt-get update

fi

# install ncurses source code for this version

if [ -z "$is_rhel" ]; then

   $dry apt-get -q -y source ncurses

else

   $dry yum install ncurses-devel

fi

if [[ "$handle_apt" == "true" ]]; then

   $dry mv /tmp/sources.list /etc/apt/

   $dry apt-get update

fi

# check if sources obtained

if [ $? -ne 0 ] && [ -z "$dry" ]

then

   echo "+------------------------------------------------------------------------------+"

   echo "|                  Unable to get NCURSES source tree!                          |"

   echo "|       Check the available packages list in /etc/apt/sources.list.            |"

   echo "+------------------------------------------------------------------------------+"

   exit

fi

# patching the source files

$dry pushd ncurses-6.* > /dev/null

if [[ "$patch_ncurses" == "true" ]]; then

   $dry wget https://proj.goldencode.com/downloads/ncurses/ncurses_curses_h_in_v6.1_20200708.patch

   $dry wget https://proj.goldencode.com/downloads/ncurses/ncurses_lib_getch_c_v6.1_20200708.patch

   $dry patch include/curses.h.in ncurses_curses_h_in_v6.1_20200708.patch

   $dry patch ncurses/base/lib_getch.c ncurses_lib_getch_c_v6.1_20200708.patch

fi

# configure and build object libraries

if [[ "$patch_ncurses" == "true" ]]; then

   $dry ./configure --with-termlib CFLAGS='-fPIC -O2' --with-abi-version=6

else

   $dry ./configure --with-termlib CFLAGS='-fPIC -O2' --with-abi-version=6 --with-pthread --enable-pthreads-eintr

fi

$dry make

# make valid reference to updated ncurses.h

$dry cd include

$dry ln -s curses.h ncurses.h

$dry cd ..

if [[ "$patch_ncurses" == "true" ]]; then

   echo "+------------------------------------------------------------------------------+"

   echo "|                 Patched NCURSES libraries update completed.                  |"

else

   echo "+------------------------------------------------------------------------------+"

   echo "|               Thread-safe NCURSES libraries build completed.                 |"

fi

# Position minimal files if path is specified

if [[ ! -z "$target_dir" ]]; then

   $dry mkdir -p $target_dir

   $dry cp -r include $target_dir

   $dry cp -r lib $target_dir

   $dry cd $target_dir

fi

# setting up system variable if not yet defined to use custom libraries location

if [ -z "$NCURSES_FWD_STATIC" ]

then

   if [[ "$system" == "true" ]]; then

      rc_filename='/etc/profile.d/10-ncurses.sh'

      msg="|         The environment has been changed! Reboot to activate changes         |"

      update="export NCURSES_FWD_STATIC=\"$PWD\""

      rm $rc_filename

   else

      rc_filename=$HOME'/.bashrc'

      msg="|   The .bashrc has been changed! Please open new console to activate setup!   |"

      update="export NCURSES_FWD_STATIC=$PWD"

   fi

   if [[ -z "$dry" ]]; then

      echo '' >> $rc_filename

      if [[ "$patch_ncurses" == "true" ]]; then

         echo '# set up patched NCURSES root location' >> $rc_filename

      else

         echo '# set up thread-safe NCURSES root location' >> $rc_filename

      fi

      echo $update >> $rc_filename

      if [[ "$patch_ncurses" != "true" ]]; then

         echo 'export NCURSES_FWD_PTHREADS=true' >> $rc_filename

      fi

   fi

   echo "|   ---------------------------   WARNING ! --------------------------------   |"

   echo "$msg"

   echo "|   ---------------------------   WARNING ! --------------------------------   |"

else

   if [ -z "$NCURSES_FWD_PTHREADS" ]

   then

      if [[ "$patch_ncurses" != "true" ]]; then

         if [[ "$system" == "true" ]]; then

            rc_filename='/etc/profile.d/10-ncurses.sh'

            msg="|         The environment has been changed! Reboot to activate changes         |"

            rm $rc_filename

         else

            rc_filename=$HOME'/.bashrc'

            msg="|   The .bashrc has been changed! Please open new console to activate setup!   |"

         fi

         if [[ -z "$dry" ]]; then

            echo 'export NCURSES_FWD_PTHREADS=true' >> $rc_filename

         fi

         echo "|   ---------------------------   WARNING ! --------------------------------   |"

         echo "$msg"

         echo "|   ---------------------------   WARNING ! --------------------------------   |"

      fi

   fi

fi

echo "|              Please do FULL FWD rebuild to activate the changes.             |"

echo "+------------------------------------------------------------------------------+"

# back to the starting directory

$dry popd > /dev/null