#!/bin/sh
#
# simplistic script to check all header files for
# differences. Intended to help detect api changes
# between releases.
#
# it's not pretty or efficient, and inspection of
# the results must be done manually.
#
# it's also not secure (don't run as root)
# or portable. Tested on Linux.
#

if [ "x$1" = "x" -o "x$2" = "x" ]; then
   echo "Usage: $0 <old-dir> <new-dir>"
   exit 1
fi

od=$1
nd=$2
DIR=/tmp
OUTPUT=$DIR/api-diff.pat
ODT=$DIR/api-od

if [ ! -d $od ]; then
   echo "old dir $od doesn't exist"
   exit 1
fi

if [ ! -d $nd ]; then
   echo "old dir $nd doesn't exist"
   exit 1
fi

# find header in nd
rm -f $OUTPUT $ODT 2>/dev/null
(cd $od && find . -type f -name "*.h"|sort > $ODT)

OH=`cat $ODT`
for h in $OH
do
   nh=$nd/$h
   oh=$od/$h
   echo "* $nh"
   if [ -f "$nh" ]; then
      echo "* diff: $h vs $nh" >> $OUTPUT
      diff -u $oh $nh >> $OUTPUT 2>&1
   else
      echo "* Old header $h not found in new headers" >> $OUTPUT
   fi
done

echo "Inspect output in $OUTPUT"
echo "See Makefile.top for libtool version bumping rules."