#!/bin/bash
# File created on 19/06/09
# Author: Mariano Rodriguez-Muro

####################
# DEFAULT VALUES
####################

PAGES=-
NUP=1x2
SCALE=1.25
DELTA="0cm -6.5cm"
OFFSET="0cm 0cm"
LANDSCAPE=true
VERBOSE=false
FILE=main.pdf
OPEN=true

##############################
# PROCESSING INPUT PARAMETERS
##############################

while getopts ":d:o:p:n:hvf:O" optname
  do                                      
    case "$optname" in
      "d")
		DELTA=$OPTARG
        ;;
      "o")
		OFFSET=$OPTARG
        ;;
      "p")
		PAGES=$OPTARG
	    ;;
      "n")
	    NUP=$OPTARG
	    ;;
	  "s")
	    SCALE=$OPTARG
		;;
	  "h")
		LANDSCAPE=false
		;;  
	  "f")
		FILE=$OPTARG
	   ;;  
	  "v")
		VERBOSE=true
       ;;
      "O")
		OPEN=false
       ;;
	  "?")
	    echo Usage: 
   		echo 
	    echo "      lncs2side [OPTIONS]"
	    echo 
		echo Where [OPTIONS] is one or more of the following optional parameters
		echo 
	    echo "     -f FILE     sets the input file to be FILE. "
	    echo "                 Defaults to main.pdf, e.g., -f some.pdf "
		echo "     -v          sets verbose mode ON. Defaults to OFF"
		echo "     -O          opens the created PDF file when the script finishes. "
		echo "                 Defaults to TRUE."
		echo "     -o OFFSET   sets the OFFSET of the pages. Defaults to 0cm 0cm." 
		echo "     -d DELTA    sets DELTA for the pages. Defaults to \"0cm -6.5cm\""
		echo "     -p PAGES    sets the PAGES parameter. Defaults to \"-\"" 
		echo "     -n NUP      sets the NUP parameter. Defaults to \"1x2\""
		echo "     -s SCALE    set the SCALE parameter. Defaults to 1.25" 
		echo "     -h          sets LANSCAPE to false. Default is true."
		echo 
	    echo "    For a full description of the parameters consult the latex \"pdfpages\" package documentation at http://dods.ipsl.jussieu.fr/fast/documents/pdfpages.pdf"    
	    echo
	    exit -1
        ;;
      ":")
        echo "No argument value for option $OPTARG"
        ;;
      *)
      # Should not occur
        echo "Unknown error while processing options"
        ;;
    esac
  done
      
echo
echo Using pages=$PAGES,nup=$NUP,scale=$SCALE
echo "      delta=$DELTA,offset=$OFFSET,landscape=$LANDSCAPE"
echo
echo Input file=$FILE


####################
# PREPARING TEMP FILE NAMES
####################

SIZE=${#FILE}
END=$(($SIZE-4))   

FILENAME=${FILE:0:END}
EXTENSION=${FILE:$((END+1))}

if [ ! -f "$FILE" ]
then
     echo ERROR: input file doesn\'t exists, aborting...
	 exit -1
fi 


if [ $EXTENSION != 'pdf' ]
then
	echo
	echo The input file must be a pdf file
	echo
	exit -1
fi

# TEMP FILE SUFIX 

TEMP_BASE=$FILENAME"_lncs2page"
TEMP_FILE=$TEMP_BASE".tex"

if [ -e "$TEMP_FILE" ]
then
  rm $TEMP_FILE 
fi 

####################
# PROCESSING TEX
####################

echo '\documentclass[a4paper]{article}' >> $TEMP_FILE
echo '\usepackage{pdfpages}' >> $TEMP_FILE
echo '\begin{document}' >> $TEMP_FILE
echo '\includepdf[pages='$PAGES',landscape='$LANDSCAPE',scale='$SCALE',delta='$DELTA',nup='$NUP']{'$FILE'}' >> $TEMP_FILE
echo '\end{document}' >> $TEMP_FILE
echo '\endinput' >> $TEMP_FILE

if [ $VERBOSE = 'true' ]
then
   pdflatex $TEMP_FILE 
else
   pdflatex $TEMP_FILE > /dev/null
fi

if [ -e "$TEMP_FILE" ]
then
  rm $TEMP_BASE.aux $TEMP_BASE.log $TEMP_FILE
fi   

# DONE

echo 'Job done! Enjoy reading in double page without killing your eyes!'
echo

if [ $OPEN = 'true' ]
then
   open $TEMP_BASE".pdf"
fi