#!/bin/bash

# script:  makeplot

# usage: $0 plotfile.gp plotdata.txt outputplot.ps
if [ $# -ne 3 ] 
then
  echo "usage: " $0 " plotfile.gp plotdata.txt outputplot.ps"
  echo "apply plot command file 'plotfile.gp' to data file 'plotdata.txt' to produce postscript plot 'outputplot.ps'"
  echo "example: " $0 "Vel_PWM.gp dataLog1.txt plot1.ps"
  exit 1
fi

# grab and validate gnuplot, data, and postscript file names
gpfile=$1
if [ ! -e $gpfile ]
then
  echo $0": error: can't find plot file " "'"$gpfile"'"
  exit 1
fi    

datafile=$2
if [ ! -e $datafile ]
then
  echo $0": error: can't find data file " "'"$datafile"'"
  exit 1
fi    

plotfile=$3
tmpdir=/tmp/tmpplot_$$

# now invoke the raw gnuplot script to process this file
# echo "procid is " $$
# echo "tmpdir is " $tmpdir

# create the tmp dir, and copy the files in
if test -d $tmpdir
then
  echo $0": error: dir " $tmpdir " exists.  I'm confused."
  exit 1
fi
mkdir $tmpdir
if [ ! -e $tmpdir ]
then
  echo $0": error: couldn't create temp dir " $tmpdir
  exit 1
fi
cp $gpfile $tmpdir
cp $datafile $tmpdir/data.txt

echo $0": applying '"$gpfile"' to '"$datafile"' to produce plot '"$plotfile"'"

# now create the plot; use cd rather than push/popd for quietude
startdir=`pwd`
cd $tmpdir
./$gpfile # creates plot.ps
cd $startdir

# plot.ps should now exist in $tmpdir
if [ ! -e $tmpdir/plot.ps ]
then
  echo $0": error: gnuplot script failed.  ask a staff member for help."
  rm -rf $tmpdir
  exit 1
fi

# copy resulting plot back to working dir
mv $tmpdir/plot.ps $plotfile
rm -rf $tmpdir

echo $0": success: created postscript plot '"$plotfile"'"
echo "  you can view this plot with the shell command 'gv "$plotfile"'"

# return all-ok
exit 0