#!/bin/bash

# Copyright (C) 2013 Ole Tange and Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This script downloads the latest version of GNU Parallel and
# installs it.
#
# It first tries to install it globally.
# If that fails, it does a personal installation.
# If that fails, it does copies to $HOME/bin

LATEST=$(wget -qO- http://ftpmirror.gnu.org/parallel | perl -ne '/(parallel-\d{8})/ and print $1."\n"' | sort | tail -n1)
test -d $LATEST/src/ || wget http://ftpmirror.gnu.org/parallel/parallel-latest.tar.bz2 -O - | bzip2 -dc | tar xvf -
cd $LATEST || exit 2
if ./configure && make && make install; then
  echo GNU $LATEST installed globally
else
  if ./configure --prefix=$HOME && make && make install; then
    echo GNU $LATEST installed in $HOME/bin
  else
    mkdir -p $HOME/bin/;
    chmod 755 src/*;
    cp src/parallel src/sem src/sql src/niceload $HOME/bin;
    echo GNU $LATEST copied to $HOME/bin
  fi

  # Is $HOME/bin already in $PATH?
  if echo $PATH | grep $HOME/bin >/dev/null; then
    # $HOME/bin is already in $PATH
    true
  else
    # Add $HOME/bin to $PATH for both bash and csh
    echo 'PATH=$PATH:$HOME/bin' >> $HOME/.bashrc
    echo 'setenv PATH ${PATH}:${HOME}/bin' >> $HOME/.cshrc
  fi

  # Is $HOME/share/man already in $MANPATH?
  if echo $MANPATH | grep $HOME/share/man >/dev/null; then
    # $HOME/share/man is already in $MANPATH
    true
  else
    # Add $HOME/share/man to $MANPATH for both bash and csh
    echo 'MANPATH=$MANPATH:$HOME/share/man' >> $HOME/.bashrc
    echo 'setenv MANPATH ${MANPATH}:${HOME}/share/man' >> $HOME/.cshrc
  fi
fi