# The idea here is to be able to re-generate the exact Javascript
# files as they exist in git.  This means munging whitespace in weird
# ways, using specific versions of various JS minimizers...

# Dependencies:
#  - bsdtar
#  - coreutils
#  - gitget <https://git.parabola.nu/packages/libretools.git/tree/src/gitget/gitget>
#  - java (for closure-compiler)
#  - node (for UglifyJS 1)
#  - npm (for UglifyJS 2)
#  - patch
#  - perl
#  - pngcrush
#  - sed
#  - wget

# Where are we?
dl-cache = ../download-cache
www = $(dl-cache)/www
bin = $(dl-cache)/bin

# What versions of 3rd party libraries are we using?
jquery-ver=1.8.3
bootstrap-ver=2.1.1
tablesorter-ver=2.7
d3-ver=3.0.6
konami-ver=c0f686e647765860ff4d2fcb7b48122785432b75

targets = \
	sitestatic/rss.png \
	sitestatic/rss@2x.png \
	sitestatic/bootstrap-typeahead.js \
	sitestatic/homepage.js \
	sitestatic/jquery-$(jquery-ver).min.js \
	sitestatic/jquery.tablesorter-$(tablesorter-ver).js \
	sitestatic/jquery.tablesorter-$(tablesorter-ver).min.js \
	sitestatic/konami.min.js \
	visualize/static/d3-$(d3-ver).js \
	visualize/static/d3-$(d3-ver).min.js \
	retro/static/2013/bootstrap-typeahead.min.1aacd3d7f4db.js \
	retro/static/2013/konami.min.e165c814457d.js


# The base rules

all: $(targets)
.PHONY: all

js-basenames = $(sort $(patsubst %.min,%,$(patsubst %.js,%,$(filter %.js,$(targets)))))
generated = $(sort $(targets) $(foreach f,$(js-basenames),$f.js $f.min.js))
clean:
	rm -f -- $(generated)
.PHONY: clean

# Make directories
$(dl-cache) $(bin):
	mkdir -p '$@'

# Don't clean up the pre-minified files
.SECONDARY:

# Turn on sane error handling
.DELETE_ON_ERROR:


# How to download files

  mangle = $(subst %,^25,$(subst :,^3A,$(subst =,^3D,$(subst ^,^5E,$1))))
unmangle = $(subst ^5E,^,$(subst ^3D,=,$(subst ^3A,:,$(subst ^25,%,$1))))

$(www)/http/%:
	mkdir -p '$(@D)'
	wget 'http://$(call unmangle,$*)' -O '$@'
	test -f '$@' && touch '$@'

$(www)/https/%:
	mkdir -p '$(@D)'
	wget 'https://$(call unmangle,$*)' -O '$@'
	test -f '$@' && touch '$@'

$(www)/git/%:
	mkdir -p '$(@D)'
	gitget checkout 'git://$(call unmangle,$*)' '$@' || { rm -rf -- '$@'; false; }
	test -d '$@' && touch '$@' || { rm -rf -- '$@'; false; }


# How to install any of the minifiers in use

# Any of the UglifyJS 1.3.x releases will produce the same output for these inputs
$(bin)/uglifyjs-1.3: $(www)/git/github.com/mishoo/UglifyJS.git\#tag=v1.3.5 | $(bin)
	printf '%s\n' '#!/bin/sh' 'exec $</bin/uglifyjs --no-copyright --ascii --max-line-len 0 "$$@"' | install -m755 /dev/stdin '$@'

# Any of the UglifyJS 2.2.x releases will produce the same output for these inputs
$(dl-cache)/uglifyjs-2.2: $(www)/git/github.com/mishoo/UglifyJS2.git\#tag=v2.2.5 | $(dl-cache)
	cp -r $< $@ || { rm -rf -- '$@'; false; }
	cd $@ && npm install || { rm -rf -- '$@'; false; }
$(bin)/uglifyjs-2.2: $(dl-cache)/uglifyjs-2.2 | $(bin)
	printf '%s\n' '#!/bin/sh' 'exec $</bin/uglifyjs --mangle --compress -- "$$@"' | install -m755 /dev/stdin '$@'

# Closure compiler 20121212 produces the same output
$(dl-cache)/unzip/compiler-20121212/%: $(www)/https/web.archive.org/web/20151226141014/https^3A//closure-compiler.googlecode.com/files/compiler-20121212.tar.gz
	mkdir -p '$(@D)'
	bsdtar xfO '$<' '$*' > '$@'
$(bin)/closure-compiler: $(dl-cache)/unzip/compiler-20121212/compiler.jar | $(bin)
	printf '%s\n' '#!/bin/sh' 'exec java -jar $< "$$@"' | install -m755 /dev/stdin '$@'


# The meat of the Makefile

# Downloaded images
$(dl-cache)/unzip/Feedicons_v.2/%: $(www)/https/web.archive.org/web/20120514074507/http^3A//www.zeusboxstudio.com/file_download/1/Feedicons_v.2.zip
	mkdir -p '$(@D)'
	bsdtar xfO $< 'Feedicons v.2/$*' > '$@'
sitestatic/rss.png: $(dl-cache)/unzip/Feedicons_v.2/RSS_16.png
	cp $< $@
sitestatic/rss@2x.png: $(dl-cache)/unzip/Feedicons_v.2/RSS_32.png
	pngcrush $< $@

# Non-minified JavaScript
sitestatic/bootstrap-typeahead.js: sitestatic/%: $(www)/https/raw.github.com/twitter/bootstrap/v$(bootstrap-ver)/js/% Makefile.d/%.patch
	cp $< $@
	patch -i Makefile.d/$*.patch $@
sitestatic/jquery-$(jquery-ver).js: sitestatic/%: $(www)/http/code.jquery.com/%
	cp $< $@
sitestatic/jquery.tablesorter-$(tablesorter-ver).js: $(www)/https/raw.github.com/Mottie/tablesorter/v$(tablesorter-ver)/js/jquery.tablesorter.js
	cp $< $@
sitestatic/konami.js: sitestatic/%: $(www)/https/raw.github.com/snaptortoise/konami-js/$(konami-ver)/% Makefile.d/%.patch
	cp $< $@
	patch -i Makefile.d/$*.patch $@
visualize/static/d3-$(d3-ver).js: %: $(www)/https/raw.github.com/mbostock/d3/v$(d3-ver)/d3.js
	cp $< $@

# JavaScript minification
sitestatic/bootstrap-typeahead.min.js: %.min.js: $(bin)/uglifyjs-1.3 %.js
	$^ > $@
sitestatic/jquery-$(jquery-ver).min.js: sitestatic/%.min.js: sitestatic/%.js Makefile.d/%.min.js.preamble
	{ cat Makefile.d/$*.min.js.preamble && $(bin)/uglifyjs-1.3 $<; } > $@
sitestatic/jquery.tablesorter-$(tablesorter-ver).min.js: sitestatic/%.min.js: sitestatic/%.js Makefile.d/%.min.js.preamble $(bin)/closure-compiler
	@# The tr/sed is to turn all of the newlines except for the last one into spaces
	{ cat Makefile.d/$*.min.js.preamble && $(bin)/closure-compiler $< | tr '\n' ' ' | sed 's, $$,\n,'; } > $@
sitestatic/konami.min.js: %.min.js: $(bin)/uglifyjs-2.2 %.js
	@# The sed is to insert newlines and whitespace at the correct places; presumably to match Dan copy/pasting into an editor.
	$^ | sed -r -e 's:e\.iphone\.stop_x|s=this\.tap===:\n\t&:g' -e 's,return"string",\n&,' | sed -e 's,;$$,,' -e '$$s,$$,\n,' > $@
visualize/static/d3-$(d3-ver).min.js: %.min.js: $(bin)/uglifyjs-2.2 %.js
	$^ > $@

# Files that make use of that minified JavaScript
retro/static/2013/konami.min.e165c814457d.js: sitestatic/konami.min.js
	cp $< $@
retro/static/2013/bootstrap-typeahead.min.1aacd3d7f4db.js: sitestatic/bootstrap-typeahead.min.js
	@# Trim trailing semicolon and newline
	< $< sed 's/;$$//' | perl -pe 'chomp if eof' > $@
sitestatic/homepage.js: sitestatic/bootstrap-typeahead.min.js sitestatic/konami.min.js Makefile.d/homepage.js.in
	{ \
		cat sitestatic/bootstrap-typeahead.min.js && \
		echo && \
		sed -e 's,^\s*,,' -e 's,^return.*,&;,' sitestatic/konami.min.js && \
		echo && \
		cat Makefile.d/homepage.js.in ; \
	} > $@