#!/bin/bash
#
# Syntax:  gvl
#
# Purpose: Shows the most recently changed .ps or .eps file in the
#          current directory.
#          The -h flag shows the help info for this command.
#
# See also: gv

# Created: Aug 19, 1998       by Bart De Schutter
# Last revised: Jul  4, 2016  by Bart De Schutter
#
# See http://www.deschutter.info/util/scripts.html for the latest version of
# this script.

# Status: public
# Category: postscript, latex

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

if [ $# -ne 0 ];
then 
   echo >&2
   echo >&2 "ERROR: ${0##*/} requires no input arguments."
   echo >&2
   sed '/^$/q;/^#!/d;s/^# //;s/^#//' $0 >&2
   exit 1
fi

psfile=$((ls -t *.ps *.eps | head -n 1) 2>/dev/null)

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 [ -n "$psfile" ];
then
   $GV_COMMAND "$psfile" &
else
   echo "No .ps or .eps files found."
fi