+ envsubst < $(TEMPLATE_DIR)/$(2) | sed -i "/<!-- $(shell echo $(addprefix _mount_,$(basename $(basename $(2)))) | tr '[:lower:]' '[:upper:]') -->/r /dev/stdin" "$(@)"
+ done
+ $(call expand_mount,$@)
+ envsubst < "$@" | sponge "$@"
+endef
+
+# usage: expand_mount [filename]
+define expand_mount
+ for mount in `sed -En 's/<!-- MOUNT_(.+) -->/\1/p' "$(1)"`; do
+ sed -i "/<!-- MOUNT_$$mount -->/r $(TEMPLATE_DIR)/`echo $$mount | tr '[:upper:]' '[:lower:]'`.template.html" "$(1)"