build: add build option to minify *.css files

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

luci.mk

@@ -83,8 +83,8 @@ PKG_GITBRANCH?=$(if $(DUMP),x,$(strip $(shell \
 
 PKG_RELEASE?=1
 PKG_INSTALL:=$(if $(realpath src/Makefile),1)
-PKG_BUILD_DEPENDS += lua/host luci-base/host $(LUCI_BUILD_DEPENDS)
-PKG_CONFIG_DEPENDS += CONFIG_LUCI_SRCDIET CONFIG_LUCI_JSMIN
+PKG_BUILD_DEPENDS += lua/host luci-base/host LUCI_CSSTIDY:csstidy/host $(LUCI_BUILD_DEPENDS)
+PKG_CONFIG_DEPENDS += CONFIG_LUCI_SRCDIET CONFIG_LUCI_JSMIN CONFIG_LUCI_CSSTIDY
 
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)
 
@@ -117,6 +117,10 @@ ifeq ($(PKG_NAME),luci-base)
 	bool "Minify JavaScript sources"
 	default y
 
+   config LUCI_CSSTIDY
+        bool "Minify CSS files"
+        default y
+
    menu "Translations"$(foreach lang,$(LUCI_LANGUAGES),
 
      config LUCI_LANG_$(lang)
@@ -169,6 +173,13 @@ define JsMin
 	done
 endef
 
+define CssTidy
+	$(FIND) $(1) -type f -name '*.css' | while read src; do \
+		if csstidy "$$$$src" --template=highest --remove_last_semicolon=true "$$$$src.o"; \
+		then mv "$$$$src.o" "$$$$src"; fi; \
+	done
+endef
+
 define SubstituteVersion
 	$(FIND) $(1) -type f -name '*.htm' | while read src; do \
 		$(SED) 's/<%# *\([^ ]*\)PKG_VERSION *%>/\1$(PKG_VERSION)/g' \
@@ -189,6 +200,7 @@ define Package/$(PKG_NAME)/install
 	  $(INSTALL_DIR) $(1)$(HTDOCS); \
 	  cp -pR $(PKG_BUILD_DIR)/htdocs/* $(1)$(HTDOCS)/; \
 	  $(if $(CONFIG_LUCI_JSMIN),$(call JsMin,$(1)$(HTDOCS)/),true); \
+	  $(if $(CONFIG_LUCI_CSSTIDY),$(call CssTidy,$(1)$(HTDOCS)/),true); \
 	else true; fi
 	if [ -d $(PKG_BUILD_DIR)/root ]; then \
 	  $(INSTALL_DIR) $(1)/; \