#!/bin/bash

# wxabicheck <oldversion> <newversion>
#
#   a crappy little script to check abi btwn wxGTK versions

tmpdir=${HOME}/tmp
pkgdir=$(portageq pkgdir)

if [[ $# -ne 2 ]]; then
	echo "Usage: $0 oldversion newversion"
	exit 1
fi

# TODO check if these versions even exist, we gave two arguments, etc

oldversion=$1
newversion=$2

# Gentoo bits - build a package for both versions
FEATURES="-test" emerge --onlydeps -abkv =wxGTK-${oldversion}
[[ $? -ne 0 ]] && exit 1
emerge -aBv =wxGTK-${oldversion}
[[ $? -ne 0 ]] && exit 1
FEATURES="-test" emerge --onlydeps -abkv =wxGTK-${newversion}
[[ $? -ne 0 ]] && exit 1
emerge -aBv =wxGTK-${newversion}
[[ $? -ne 0 ]] && exit 1

[[ ! -d ${tmpdir} ]] && mkdir -p "${tmpdir}"

for version in ${oldversion} ${newversion}; do
	mkdir -p "${tmpdir}"/${version}
	cp "${pkgdir}"/x11-libs/wxGTK-${version}.tbz2 "${tmpdir}"/${version}
	pushd "${tmpdir}"/${version} > /dev/null
	tar xf wxGTK-${version}.tbz2 2> /dev/null

	# file listing
	find ./usr -print > "${tmpdir}"/${version}.files
	sed -i -e "s:${version}:wxabicheck:g" "${tmpdir}"/${version}.files

	# symbol listing
	pushd "${tmpdir}"/${version}/usr/lib64 > /dev/null
	for i in *.so; do
		nm -D --defined-only $i \
			| cut -c18- \
			| sort \
			> "${tmpdir}"/${version}/${i}.symbols
		nm -D --defined-only -C $i \
			| cut -c18- \
			| sort \
			> "${tmpdir}"/${version}/${i}.symbols-demangled
	done
	popd > /dev/null

	for i in *.symbols-demangled; do
		grep '^[A-Z].' ${i} \
			| sort \
			> ${i}-global
	done
	popd > /dev/null
done

pushd "${tmpdir}" > /dev/null

echo
echo "File Diff"
echo "---------"
echo
diff -U0 ${oldversion}.files ${newversion}.files \
		| grep -v '^@@ .* @@$' \
		| colordiff

#diff -U0 ${oldversion}.files ${newversion}.files > files.diff

echo
echo "Symbol Diff"
echo "-----------"
echo
for i in $(find . -name *-global -print | cut -d/ -f3 | sort | uniq); do
	echo ${i//.symbols-demangled-global/}
	diff -U0 ${oldversion}/"${i}" ${newversion}/"${i}" \
		| grep -v '^@@ .* @@$' \
		| colordiff
	echo
done

popd > /dev/null