update: ask to install new scripts

misc/update

@@ -32,9 +32,24 @@ gitupdate() {
 if [[ ! $skip ]] then
 	# update scripts
 	check "Updating scripts..."
+	local pre_update=$(git -C "$SCRIPTS_DIR" show-ref -s HEAD)
 	local result=$(gitupdate "$SCRIPTS_DIR" 2>&1)
 	if [[ $? == 0 ]]; then
 		succeed
+
+		new_scripts=( $(git log --diff-filter=A --name-only --pretty= $pre_update..HEAD) )
+		if [[ -n $new_scripts ]]; then
+			echo "New scripts:"
+			for script in $new_scripts; do
+				echo "  $script"
+			done
+			echo -n "Install new scripts? [y/n]"
+			if read -q; then
+				pushd $SCRIPTS_DIR
+				./install.sh $new_scripts
+				popd
+			fi
+		fi
 		exec "$0" "${ALL_ARGS[@]}" --skip-scripts
 	else
 		fail "error during script updates"