LF='
'
-# First try git-describe, then see if there is a version file
-# (included in release tarballs), then default
-if VN=$(git describe --abbrev=4 HEAD 2>/dev/null) &&
+tree_search ()
+{
+ head=$1
+ tree=$2
+ for p in $(git rev-list --parents --max-count=1 $head 2>/devnull)
+ do
+ test $tree = $(git rev-parse $p^{tree} 2>/dev/null) &&
+ vn=$(git describe --abbrev=4 $p 2>/dev/null) &&
+ case "$vn" in
+ gitgui-[0-9]*) echo $vn; break;;
+ esac
+ done
+}
+
+# We may be a subproject, so try looking for the merge
+# commit that supplied this directory content if we are
+# not at the toplevel. We probably will always be the
+# second parent in the commit, but we shouldn't rely on
+# that fact.
+#
+# If we are at the toplevel or the merge assumption fails
+# try looking for a gitgui-* tag, or fallback onto the
+# distributed version file.
+
+if prefix="$(git rev-parse --show-prefix 2>/dev/null)"
+ test -n "$prefix" &&
+ head=$(git rev-list --max-count=1 HEAD -- . 2>/dev/null) &&
+ tree=$(git rev-parse --verify "HEAD:$prefix" 2>/dev/null) &&
+ VN=$(tree_search $head $tree)
+ case "$VN" in
+ gitgui-[0-9]*) : happy ;;
+ *) (exit 1) ;;
+ esac
+then
+ VN=$(echo "$VN" | sed -e 's/^gitgui-//;s/-/./g');
+elif VN=$(git describe --abbrev=4 HEAD 2>/dev/null) &&
case "$VN" in
- *$LF*) (exit 1) ;;
gitgui-[0-9]*) : happy ;;
+ *) (exit 1) ;;
esac
then
VN=$(echo "$VN" | sed -e 's/^gitgui-//;s/-/./g');