#!/bin/sh
#
# This shell script processes GHDL simulation report output
# and converts time stamps to microseconds in a more convenient
# format.
#
# Example usage:
#
#  $ ./test_bench --stop-time=100ms 2>&1 | ./filter
# 

awk -F ':' '
  function time_conv(s)
  {
    match(s, "^@([0-9]+)([a-zA-Z]+)$", a);
    units = a[2];
    value = a[1];
    if (units == "us")
      div = "1";
    else if (units == "ns")
      div = "1000";
    else if (units == "ps")
      div = "1000000";
    else if (units == "ms")
      div = "0.001";
    else
      div = "0";
    cmd = sprintf("echo \"scale=3;%s/%s\" | bc 2>/dev/null", value, div);
    cmd | getline var;
    close(cmd);
    return var;
  }
  { printf("%-64s %s us\n", $6, time_conv($4)); }
'