#!/bin/bash 

#clear - removes the compilation directory before start
#no_comp - skips compilation
#vcd run with vcd
#200 run 200 us. This is an optioanlly parameter. Default is 100 us.
if [ "$1" = "clear" ] ; then
  #clear any former compilation results
  rm -fr work
  shift
fi

if [ -d "work" ] ; then
  echo "work directory exists"
else
  mkdir work
fi

comp_skip="no"
ghdl_vcd="no"
ghdl_time="100"
#build the simulation command
while (( "$#" )); do
  if [ "$1" = vcd ] ; then
    ghdl_vcd="yes"
  else
	if [ "$1" = "no_comp" ] ; then
	  comp_skip="yes"
	else
	  #checks for time validity - has to be a number
      echo $1 | grep "^[0-9]*$" >> /dev/null
	  if [ $? -eq 0 ] ; then
	    ghdl_time=$1
	  fi
    fi
  fi
  shift
done
ghdl_run="./tx_tb --stop-time="${ghdl_time}"us --assert-level=error"
if [ "$ghdl_vcd" = "yes" ] ; then 
  ghdl_run=${ghdl_run}" --vcdgz=ghdl.vcd.gz"
fi
ghdl_run=${ghdl_run}" >& ghdl.log"

if [ "$comp_skip" = "yes" ] ; then
  #If compilation is skipped, run can only start if the executable exists.
  ls -l tx_tb > /dev/null
else
  ghdl -a --ieee=synopsys --workdir=work --work=work ../RTL/tx.vhd ../TB/tx_tb.vhd > cmp.log
fi

if [ $? -eq 0 ] ; then
  #compilation ended or need to be skipped
  if [ -e "tx_tb" ] ; then
	#erase the executable file, if it exists
    rm -f tx_tb
  fi
  ghdl -e --workdir=work --ieee=synopsys tx_tb
  if [ -e "tx_tb" ] ; then
    echo "compilation and elaboration ended okay"
	eval $ghdl_run
  fi
else
  less cmp.log
fi