#!/bin/sh
set -eu

RET=0
LIB=${WAYLAND_EGL_LIB}

if ! test -f "$LIB"; then
	echo "Test binary \"$LIB\" does not exist"
	exit 99
fi

if ! test -n "$NM"; then
	echo "nm environment variable not set"
	exit 99
fi

AVAIL_FUNCS="$($NM -D --format=bsd --defined-only $LIB | awk '{print $3}')"

# Official ABI, taken from the header.
REQ_FUNCS="wl_egl_window_resize
wl_egl_window_create
wl_egl_window_destroy
wl_egl_window_get_attached_size
"

NEW_ABI=$(echo "$AVAIL_FUNCS" | while read func; do
    echo "$func" | grep -q "^_" && continue
    echo "$REQ_FUNCS" | grep -q "^$func$" && continue

    echo $func
done)

if test -n "$NEW_ABI"; then
	echo "New ABI detected - If intentional, update the test."
	echo "$NEW_ABI"
	RET=1
fi

REMOVED_ABI=$(echo "$REQ_FUNCS" | while read func; do
    echo "$AVAIL_FUNCS" | grep -q "^$func$" && continue

    echo $func
done)

if test -n "$REMOVED_ABI"; then
	echo "ABI break detected - Required symbol(s) no longer exported!"
	echo "$REMOVED_ABI"
	RET=1
fi

exit $RET