build: introduce official way to opt out of source minification

Introduce three new default enabled variables `LUCI_MINIFY_JS`,
`LUCI_MINIFY_LUA` and `LUCI_MINIFY_CSS`  that allow LuCI component
Makefiles to opt out of JavaScript, Lua and CSS compression respectively.

To e.g. inhibit CSSTidy postprocessing in a theme, the corresponding
Makefile can set `LUCI_MINIFY_CSS:=0` prior to including `luci.mk`.

Fixes: #5755
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

diff --git a/luci.mk b/luci.mk
index 4c69a5e3bb80de9ea86772190a018fb7cff95207..42264c07cc9824ec17643150146aa94f05e417c3 100644 (file)
--- a/luci.mk
+++ b/luci.mk
@@ -14,6 +14,9 @@ LUCI_SECTION?=luci
 LUCI_CATEGORY?=LuCI
 LUCI_URL?=https://github.com/openwrt/luci
 LUCI_MAINTAINER?=OpenWrt LuCI community
+LUCI_MINIFY_LUA?=1
+LUCI_MINIFY_CSS?=1
+LUCI_MINIFY_JS?=1
 
 # Language code titles
 LUCI_LANG.ar=العربية (Arabic)
@@ -217,26 +220,44 @@ endef
 endif
 
 # some generic macros that can be used by all packages
-define SrcDiet
+ifeq ($(LUCI_MINIFY_JS),1)
+  define SrcDiet
        $(FIND) $(1) -type f -name '*.lua' | while read src; do \
                if LUA_PATH="$(STAGING_DIR_HOSTPKG)/lib/lua/5.1/?.lua" luasrcdiet --noopt-binequiv -o "$$$$src.o" "$$$$src"; \
                then mv "$$$$src.o" "$$$$src"; fi; \
        done
-endef
+  endef
+else
+  define SrcDiet
+       $$(call MESSAGE,$$(LUCI_NAME) does not support Lua source minification)
+  endef
+endif
 
-define JsMin
+ifeq ($(LUCI_MINIFY_JS),1)
+  define JsMin
        $(FIND) $(1) -type f -name '*.js' | while read src; do \
                if jsmin < "$$$$src" > "$$$$src.o"; \
                then mv "$$$$src.o" "$$$$src"; fi; \
        done
-endef
+  endef
+else
+  define JsMin
+       $$(call MESSAGE,$$(LUCI_NAME) does not support JavaScript source minification)
+  endef
+endif
 
-define CssTidy
+ifeq ($(LUCI_MINIFY_CSS),1)
+  define CssTidy
        $(FIND) $(1) -type f -name '*.css' | while read src; do \
                if csstidy "$$$$src" --template=highest --remove_last_semicolon=true "$$$$src.o"; \
                then mv "$$$$src.o" "$$$$src"; fi; \
        done
-endef
+  endef
+else
+  define CssTidy
+       $$(call MESSAGE,$$(LUCI_NAME) does not support CSS source minification)
+  endef
+endif
 
 define SubstituteVersion
        $(FIND) $(1) -type f -name '*.htm' | while read src; do \