#!/bin/bash
#
# Syntax:  mk_2up [-h] [-p] [-m margin] [-b border] [-x width] [dvi_file [...]]
#
# Purpose: Creates 2up pdf files for the given dvi files.
#          The -p option indicates that a postscript file should be generated
#          instead of a pdf file.
#          If no input argument is given the most recently changed .dvi file
#          in the current directory is processed.
#          Use the -m option to specify a margin around the whole page
#          (default: 10).
#          Use the -b option to specify a margin around a single subpage
#          (default: 0).
#          Use the -x option to draw a box around each subpage with the given
#          width (default value: 0).
#          The -h flag shows the help info for this command.

# Created: Mar 15, 2003       by Bart De Schutter
# Last revised: Feb 11, 2011  by Bart De Schutter
#
# See http://www.deschutter.info/util/scripts.html for the latest version of
# this script.

# Status: public
# Category: latex, pdf

#
# Process input arguments.
#
margin="10"
border="0"
box_width="0"
psnup_options=""
postscript=0
dvips_options="-Ppdf -G0"
while getopts :hpm:b:x: option
do
   case "$option" in
      h) sed '/^$/q;/^#!/d;s/^# //;s/^#//' $0 >&2
         exit 1;;
      p) postscript=1
         dvips_options="";;
      m) margin=$OPTARG;;
      b) border=$OPTARG;;
      x) box_width=$OPTARG;;
      :) echo >&2
         echo >&2 "Option -$OPTARG requires an argument."
         echo >&2
         sed '/^$/q;/^#!/d;s/^# //;s/^#//' $0 >&2
         echo >&2
         exit 1;;
     \?) echo >&2
         echo >&2 "Unknown option: $OPTARG"
         echo >&2
         sed '/^$/q;/^#!/d;s/^# //;s/^#//' $0 >&2
         exit 1;;
   esac
done
shift $(($OPTIND-1))

if [ $border != 0 ]
then
   psnup_options="$psnup_options -b$border"
fi
if [ $box_width != 0 ]
then
   psnup_options="$psnup_options -d$box_width"
fi

#
# Define temporary directory and template.
#

if [[ -d ~/tmp ]]
then
   tmp=~/tmp
elif [[ ( -n "$TMPDIR" ) || ( ! -d "$TMPDIR" ) ]]
then
   tmp="$TMPDIR"
elif [[ -d /tmp ]]
then
   tmp=/tmp
else
   tmp=`pwd`
fi
tmp_template="$tmp/${0##*/}__$(date '+%Y_%m_%d__%H_%M_%S')__XXXXXXXXXXXX"\

#
# Determine which files should be processed.
#
declare -a dvi_files  # Declare as array. This is necessary to be able to deal
                      # with file names that contain spaces.
if [ $# -eq 0 ];
then
   dvi_files=$( (ls -t *.dvi | head -n 1) 2>/dev/null )
   if [ -z "$dvi_files" ];
   then
      echo "No .dvi files found."
      exit 1
   fi
else
   dvi_files=("$@")
fi

#
# Process dvi files.
#

for fil in "${dvi_files[@]}"
do
   fil="${fil%.dvi}"
   echo "Processing $fil"
   tmp_ps_fil=$(mktemp "${tmp_template}") || exit 1
   \dvips ${dvips_options} "${fil}.dvi" -o "$tmp_ps_fil"
   psnup -2 -pa4 -m${margin} $psnup_options "$tmp_ps_fil" "${fil}_2up.ps"

   \rm "$tmp_ps_fil" 2>/dev/null
   if [ $postscript -eq 0 ];
   then
      ps2pdf13 -sPAPERSIZE=a4 "${fil}_2up.ps" "${fil}_2up.pdf"
      \rm "${fil}_2up.ps" 2>/dev/null
      echo "Created file ${fil}_2up.pdf"
   else
      echo "Created file ${fil}_2up.ps"
   fi
   echo
# or, with pipes:
#   \dvips -Ppdf -G0 "${fil}.dvi" -o - | \
#      psnup -2 -pa4 -m${margin}  | \
#      ps2pdf13 -sPAPERSIZE=a4 - "${fil}_2up.pdf"
done