From 4a42edbc1b9210f03e62c70f8e6185bc393e0c5f Mon Sep 17 00:00:00 2001
From: Jan Lindemann <jan@janware.com>
Date: Mon, 3 Sep 2018 11:52:45 +0000
Subject: [PATCH] htdocs.mk, js.mk: Add js.mk, providing minification

Signed-off-by: Jan Lindemann <jan@janware.com>
---
 make/htdocs.mk |  1 +
 make/js.mk     | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 make/js.mk

diff --git a/make/htdocs.mk b/make/htdocs.mk
index afb70f0a..2177c1d4 100644
--- a/make/htdocs.mk
+++ b/make/htdocs.mk
@@ -3,6 +3,7 @@ LESS_GENERATED_CSS        ?= $(patsubst %.less,%.css,$(LESS_SRC))
 LESS_CPY                  ?= lesscpy
 
 include $(MODDIR)/make/defs.mk
+include $(MODDIR)/make/js.mk
 include $(MODDIR)/make/rules.mk
 
 all: $(LESS_GENERATED_CSS)
diff --git a/make/js.mk b/make/js.mk
new file mode 100644
index 00000000..843617e6
--- /dev/null
+++ b/make/js.mk
@@ -0,0 +1,20 @@
+JAVA              ?= /usr/bin/java
+JS_MINIFY_EXE     ?= $(JAVA) -jar /usr/share/java/closure-compiler.jar
+JS_LOCAL          ?= $(wildcard *.js)
+JS_SRC            ?= $(filter-out %.min.js,$(JS_LOCAL))
+JS_GENERATED      ?= $(patsubst %.js,%.min.js,$(JS_SRC))
+
+# This is not nice. It requires install-files to be included from elsewhere,
+# which is not obvious. OTOH, if it isn't, SOURCE_FILES doesn't do any harm,
+# either.
+SOURCE_FILES      += $(JS_GENERATED)
+
+all: $(JS_GENERATED)
+clean: minify.clean
+
+%.min.js: %.js
+	$(JS_MINIFY_EXE) $< > $@.tmp
+	mv $@.tmp $@
+
+minify.clean:
+	rm -f $(JS_GENERATED) *.tmp