pathsearch = $(firstword $(wildcard $(addsuffix /$(1),$(subst :, ,$(PATH)))))
pick = $(firstword $(foreach prog,$1,$(call pathsearch,$(prog))) false)

RM = rm -f
CP = cp
PATCH = patch
SASS = sass
PHP = $(call pick,php5 php)
PNGCRUSH = $(call pick,pngcrush cp)

WGET = $(call pick,wget curl)
ifeq ($(notdir $(WGET)),wget)
WGETFLAGS = -O-
endif
WGET_OUTFLAG = >

SVG2PNG = $(call pick,rsvg-convert convert)
ifeq ($(notdir $(SVG2PNG)),rsvg-convert)
SVG2PNG_OUTFLAG = -o
endif

default: all

include theme.mk
srcfiles += twentyeleven-fix.scss license.txt
srcfiles += .gitignore theme.mk Makefile

all: .gitignore $(targets)

%: %.patch ../twentyeleven/%
	$(RM) $@
	$(CP) ../twentyeleven/$@ $@
	$(PATCH) $@ < $@.patch

%.css: %.scss
	$(SASS) $< $@

%: %.php
	$(PHP) -f $< > $@

%.png: %.svg
	$(SVG2PNG) $< $(SVG2PNG_OUTFLAG) $@.$$$$ && \
	$(PNGCRUSH) $@.$$$$ $@ ; \
	$(RM) $@.$$$$

###########################################################################

in_dir = $(patsubst ./%,%,$(dir $1))
my_dir = $(patsubst %/,%,$(dir $1))
define gitignore_file
$(if $(in_dir),
    $(call gitignore_file,$(my_dir))
    echo '$(my_dir)/*' >> '$@';
)
echo '!$1' >> '$@';
endef

.gitignore: Makefile theme.mk
	echo "# DO NOT EDIT, this file is automatically made by \`Makefile'" >$@
	echo '# '                 >> '$@'
	echo '# ignore everyting' >> '$@'
	echo '*'                  >> '$@'
	echo '# but these:'       >> '$@'
	$(foreach file,$(srcfiles),$(call gitignore_file,$(file)))

###########################################################################

git2make = $1 $(subst *,.*,$1)
gitignore_y = $(call git2make,$(shell sed -n 's/^[^\#!]/&/p' .gitignore))
gitignore_n = $(call git2make,$(shell sed -n 's/^!//p'       .gitignore))
gitignore_i = . .. .git %/.. %/.
gitignore = $(filter-out $(gitignore_i) $(wildcard $(gitignore_n)),$(wildcard $(gitignore_y)))

clean: .gitignore PHONY
	$(RM) -r $(filter-out $(targets),$(gitignore))
distclean: .gitignore PHONY
	$(RM) -r $(gitignore)

###########################################################################

.PHONY: FORCE PHONY
FORCE: ;
PHONY: ;