# hdrs.ksh

#!/bin/sh

if [ $# -lt 3 ]
then
  echo "usage: $0 modifydir fromdir prefix [oldprefix]"
  exit 1
fi

modifydir=$1
shift
fromdir=$1
shift
prefix=$1
if ! expr "$prefix" : '.*/$' >nul:
then
  prefix="$prefix/"
fi

shift
if [ "x$1" != x ]
then
  oldpre=$1
  if ! expr "$oldpre" : '.*/$' >nul:
  then
    oldpre="$oldpre/"
  fi

else
  oldpre=""
fi

find $fromdir -name \*.h |\
grep -v replacebackup |\
while read header
do
  n=`expr $header : "$fromdir/"'\(.*\)'`
  if [ $fromdir == $modifydir ] || ! [ -f $modifydir/$n ]
  then
    # only do this if the file doesn't exist in the modifydir
    echo 's,^([ 	]*#include.*[<"])'"$oldpre"'('"$n"'[">]),$1'"$prefix"'$2,i;'
    bs=`echo $n | sed 's,/,.,'`
    if [ "$bs" != "$n" ]
    then
      print 's,^([ 	]*#include.*[<"])'"$oldpre"'('"$bs"'[">]),$1'"$prefix"'$2,i;'
    fi
  fi
done >$TMPDIR/perl.$$

find $modifydir -name \*.h |\
grep -v replacebackup |\
while read header
do
  perl -p $TMPDIR/perl.$$ <$header >$TMPDIR/hdr.$$
  if ! cmp -s $header $TMPDIR/hdr.$$
  then
    p4 edit $header
    mkdir -p `dirname $header`/replacebackup.$$
    cp -p $header `dirname $header`/replacebackup.$$/`basename $header`
    cp $TMPDIR/hdr.$$ $header
  fi
done

rm -f $TMPDIR/perl.$$
rm -f $TMPDIR/hdr.$$