#!/bin/bash
#
# Syntax:  gv [-h] [postscript_file [...]]
#
# Purpose: Shows one or more postscript files using kghostview, gsview,
#          ghostview, or okular.
#          If no input argument is given, the most recently changed .ps
#          or .eps file in the current directory is shown.
#          The -h flag shows the help info for this command.
#
# See also: gvl
#
# Note: You may have to include a line like
#       alias gv=~/your_bin_dir/gv
#       in your login files (e.g., .bashrc) in order to be able to use
#       this command.

# Created: Oct 12, 1998       by Bart De Schutter
# Last revised: Jun 30, 2016  by Bart De Schutter

# Status: public
# Category: postscript, latex

if [  $# -ge 1   -a   "$1" = "-h"  ];
then
   sed '/^$/q;/^#!/d;s/^# //;s/^#//' $0 >&2
   exit 1
fi

GV_COMMAND=$(type -p /usr/bin/gv)
if [ -z "$GV_COMMAND" ]
then
   GV_COMMAND=$(type -p kghostview)
   if [ -z "$GV_COMMAND" ]
   then
      GV_COMMAND=$(type -p gsview)
      if [ -z "$GV_COMMAND" ]
      then
         GV_COMMAND=$(type -p ghostview)
         if [ -z "$GV_COMMAND" ]
         then
            GV_COMMAND=$(type -p okular)
            if [ -z "$GV_COMMAND" ]
            then
               echo >&2
               echo >&2 "ERROR: No ps viewer found on this system."
               echo >&2
               exit 1
            fi
         fi
      fi
   fi
fi

if [ $# -eq 0 ];
then
   psfile=$((ls -t *.ps *.eps | head -n 1) 2>/dev/null)
   if [ -n "$psfile" ];
   then
      LANG=C $GV_COMMAND "$psfile" &
   else
      echo "No .ps or .eps files found."
   fi
else
   for psfile in "$@"
   do
      echo "Viewing $psfile"
      $GV_COMMAND "$psfile"
   done
fi