#!/bin/bash

ls .. | cut -c2-3 | grep -v 19 | grep -v 20 | grep -v 31 | while read d
do
  d_prev=`expr $d - 1`
  d2=`ls -d ../a$d_prev*`
  d1=`ls -d ../a$d*`

  echo -ne "<p><font size=5><b>===== Comparing $d1 with $d2 =====</b></p></font>\r\n"

  ls $d1/*.txt | while read f1
  do
    f=`basename $f1`
    f2=$d2/$f
    echo -ne "<p>\r\n"
    echo -ne "<a href=$f1>$f</a>"
    if [ -f $f2 ]
    then
      if diff $f1 $f2 > /dev/null
      then
        echo -ne "\r\n"
      else
        echo -ne "&nbsp;changed (diff <a href=$f2>$f2</a> $f1)<BR>\r\n"
        echo -ne "<font face=Courier New>\r\n"
        diff $f2 $f1 | awk '
          {gsub("[^ -~]$","")}
          {gsub(" ","\\&nbsp;")}
          {printf("&nbsp;&nbsp;%s<BR>\r\n",$0)}
        '
        echo -ne "</font>\r\n"
      fi
    else
      echo -ne "<b>&nbsp;[new]</b>\r\n"
    fi
    echo -ne "</p>\r\n"
  done
done