#! /bin/bash
#
# Shell script to massage the output of a recursive diff
# into a format which can be used for code reviews.
#
# Author:  Mitch Davis <mjd@alphalink.com.au>.
# License: Public domain, no rights reserved.
#
# Credits: Loosely based on an earlier program by Denis Dowling,
#          <dpd@alphalink.com.au>
#
# TODO:    Put in a trap to clean up temporary files.
# TODO:    The good thing about the subpatch approach was that
#          you could reorder patches, for instance, .c and .h files.
#
# Version: 2.3  Tue Feb 12 16:10:43  2002
VERSION=2.3

stderr()
{
  echo "$*" 1>&2
}

error()
{
  stderr "$0: $*"

  rm -f /tmp/mrd-*-$$
  exit 1
}


# Alter the heading of each diff.
fixdiff()
{
  awk '
    BEGIN {
        in_header = 0;
        LINENO = 1;
    }

    {
        LINE=$0
    }

    in_header > 0 {
      if (in_header == 2)
      {
        vars = split($0, VAR);
        printf "      #### Changes to file %s\n", VAR[2];
        printf "%-60s %5d\n", $2, LINENO;
      }
      in_header--;
      gsub(/\t.*/, "");
      suppress_numbers = 1;
    }

    /^diff / {
      in_header = 2;
      next;
    }

    {
      if (suppress_numbers == 1)
      {
        printf "     %s\n", $0;
      }
      else
      {
        printf " %4d %s\n", LINENO++, $0;
      }
      suppress_numbers = 0;
    }

    END {
      printf "      #### Done.\n";
    }
  '
}

show_changed()
{
  grep "^[^ ]" | \
  awk '
    NR==1 {printf "A"}
    {printf "\t%s\n", $0}
  '
}

# main
content=/tmp/mrd-content-$$

fixdiff > $content

# Build the summary
echo "	Code Review File"
echo "	Created by $USER, using makereviewdiff $VERSION"
echo "	Created on `date`"
echo "	Script run from directory `pwd`"
echo
echo "P3142 EXPANdsl R2 Implementation"
echo
echo '*** DO NOT FORGET TO TAG THE REPOSITORY BEFORE CHECKINS ***'
echo
echo "	-------- Change comments -------"
echo "A: "
echo
echo "	------------ Summary -----------"
echo "	---- Changed Files ----"
show_changed < $content
echo "	--------- End of Summary -------"
echo
grep -v "^[^ ]" < $content

# Delete the temporary files.
FSPEC="/tmp/mrd-*-$$"
rm $FSPEC

exit 0