support single providers.json; add v.recipes provider (fixes #17, thank you @morytyann)

Author: stangri

Makefile

@@ -22,6 +22,27 @@ help
 	Version: $(PKG_VERSION)-$(PKG_RELEASE)
 endef
 
+# Consolidate individual provider JSON files into providers.json in the build tree.
+# luci.mk's Build/Prepare calls Build/Prepare/$(LUCI_NAME) as a per-package hook.
+# The merged file lands in root/ so luci.mk's install step copies it automatically.
+define Build/Prepare/luci-app-https-dns-proxy
+	@if [ -d $(PKG_BUILD_DIR)/root/usr/share/https-dns-proxy/providers ] \
+		&& ls $(PKG_BUILD_DIR)/root/usr/share/https-dns-proxy/providers/*.json >/dev/null 2>&1; then \
+			sep=''; printf '[' > $(PKG_BUILD_DIR)/root/usr/share/https-dns-proxy/providers.json; \
+			for f in $(PKG_BUILD_DIR)/root/usr/share/https-dns-proxy/providers/*.json; do \
+				printf '%s' "$$$$sep" >> $(PKG_BUILD_DIR)/root/usr/share/https-dns-proxy/providers.json; \
+				cat "$$$$f" >> $(PKG_BUILD_DIR)/root/usr/share/https-dns-proxy/providers.json; \
+				sep=','; \
+			done; \
+			printf ']' >> $(PKG_BUILD_DIR)/root/usr/share/https-dns-proxy/providers.json; \
+	fi
+	@if grep -q '"title"' $(PKG_BUILD_DIR)/root/usr/share/https-dns-proxy/providers.json 2>/dev/null; then \
+		rm -rf $(PKG_BUILD_DIR)/root/usr/share/https-dns-proxy/providers; \
+	else \
+		rm -f $(PKG_BUILD_DIR)/root/usr/share/https-dns-proxy/providers.json; \
+	fi
+endef
+
 include ../../luci.mk
 
 # call BuildPackage - OpenWrt buildroot signature