#!/bin/bash
##
##  $Id$
##

# Check for existence of src/cparam_pencils.inc
if [ ! -e src/cparam_pencils.inc ]; then
  echo " Could not find the file src/cparam_pencils.inc."
  echo " Please compile the code with 'make' before using pc_pencil_swap."
  echo ""
  echo "Exiting."
  exit
fi

# Take number of pencils from src/cparam_pencils.inc
npencils=`grep 'integer, parameter :: npencils=' src/cparam_pencils.inc | sed -e 's/^.*:: npencils=//g'`

# Introduction message
echo "Welcome to pc_pencil_swap!"
echo ""
echo " There are $npencils pencils provided by the modules in this run. The"
echo " code only needs some of these for this specific run. These pencils"
echo " have been chosen by the modules based on the input parameters."
echo ""
echo " I will now go through each provided pencil and swap the code's"
echo " requirement so that needed pencils will not be calculated while"
echo " unneeded pencils will. For each pencil I will run the code and check"
echo " if the result agrees with the reference data."
echo ""
echo " Note that including an unneeded pencil should not change the results"
echo " If the results are changed, then that pencil is actually needed."
echo " If the exclusion of a needed pencil does not change the results,"
echo " then that pencil is not needed after all."
echo ""
echo " You may want to consider making a special test version of your run."
echo " Copy this run to another directory and set it=10 and it1=2. Then"
echo " produce first some reference data and save it in reference.out. You can"
echo " see in data/pencils.list which pencils are used and their number in"
echo " the pencil case. You can see the full numbering of all provided"
echo " pencils in the file src/cparam_pencils.inc."
echo ""

# Check if ipencil_swap present in run.in
if [ ! -n "`grep ipencil_swap run.in`" ]; then
  echo " Could not find any ipencil_swap in run.in."
  echo " Please put ipencil_swap=0 in run_pars by hand."
  echo ""
  echo "Exiting."
  exit
fi

# Check for reference data
if [ ! -e reference.out ]; then
  echo " Could not find any reference data file (reference.out)."
  echo " Please run the code and copy data/time_series.dat to reference.out."
  echo ""
  echo "Exiting."
  exit
fi

# Remove old log files
rm -f pc_pencil_swap_diff.log pc_pencil_swap_diff.log

# Loop over pencils
i=1
while [ $i -lt `expr $npencils + 1` ]; do
  echo ""
  echo " Swapping pencil number $i."
  echo " --------------------------"
  echo "" >> pc_pencil_swap_diff.log
  echo " Swapping pencil number $i." >> pc_pencil_swap_diff.log
  echo " --------------------------" >> pc_pencil_swap_diff.log
  sed -e "s/ipencil_swap=[0-9]*/ipencil_swap=$i/g" --in-place run.in
  rm -rf data/*
  echo " Running code..."
  start_run.csh > pc_pencil_swap_run.log
  echo " Comparing result to reference data."
  diff data/time_series.dat reference.out
  diff data/time_series.dat reference.out >> pc_pencil_swap_diff.log
  i=$((++i))
done