# This is free and unencumbered software released into the public
# domain. To the extent possible under law, the author of this file
# waives all copyright and related or neighboring rights to it.

.DELETE_ON_ERROR:

javascript>fallback = $(firstword $(shell command -v $1) $2 $1)

NPM ?= npm
NPMROOT ?= $(CURDIR)

npmbindir = $(NPMROOT)/node_modules/.bin
.PRECIOUS: $(npmbindir)/%

npmbin = $(call javascript>fallback,$1,$(npmbindir)/$1)

JSTEST ?= $(npmbindir)/jstest
JSHINT ?= $(call npmbin,jshint)

uglifyjs_npm_package := uglify-js

UGLIFY ?= $(call npmbin,uglifyjs)
UGLIFYFLAGS ?= --comments \
               --compress $(UGLIFYCOMPRESSFLAGS) \
               --mangle $(UGLIFYMANGLEFLAGS)

BUILDDIR ?= build/
JSSTAMPDIR ?= $(BUILDDIR)/stamp
JSHINTDIR ?= $(JSSTAMPDIR)
JSTESTDIR ?= $(JSSTAMPDIR)
JSUGLYDIR ?= $(CURDIR)

JSHINTFLAGS += $(if $(JSHINTCONFIG),--config $(JSHINTCONFIG))
JSTESTFLAGS += $(if $(JSTESTFORMAT),--format $(JSTESTFORMAT))
JSTESTENV += $(if $(JSTEST_NODE_PATH),NODE_PATH=$(JSTEST_NODE_PATH))
JSTESTFORMAT ?= spec

jshint-stampify = $(patsubst %.js,$(JSHINTDIR)/%.js.lint,$1)
jstest-stampify = $(patsubst %.js,$(JSTESTDIR)/%.js.test,$1)
uglify-stampify = $(patsubst %.js,$(JSUGLYDIR)/%.min.js,$1)

javascript>capture-to-target = @echo "$1" && $1 > $@ || (cat $@ && exit 1)

UGLIFY.js = $(UGLIFY) $(UGLIFYFLAGS)
LINT.js = $(JSHINT) $(JSHINTFLAGS)
TEST.js = $(JSTESTENV) $(JSTEST) $(JSTESTFLAGS)

$(JSUGLYDIR)/%.min.js: %.js | $(UGLIFY)
	mkdir -p $(@D)
	$(UGLIFY.js) < $< > $@

$(JSHINTDIR)/%.js.lint: %.js | $(JSHINT)
	mkdir -p $(@D)
	$(LINT.js) $<
	touch $@

$(JSTESTDIR)/%.js.test: %.js | $(JSTEST)
	mkdir -p $(@D)
	$(call javascript>capture-to-target,$(TEST.js) $<)

$(npmbindir)/%:
	$(NPM) install $(firstword $(value $(@F)_npm_package) $(@F))