# Exmaple:  
#    make -k A=20070112 B=20070123
# A, B are make (or env) variables giving the ConTeXt versions to compare.

ifneq (,$(wildcard .svn/))
$(error This is your repo! 'svn export' elsewhere to run $(MAKE))
endif

# for >& redirection
SHELL        := /bin/bash

# default dates, so that "make -k" should be all you need
A             ?= 20070112
B             ?= 20070123

# you might want to change these texexec options
# Don't use --timeout for now, since it can confuse the exit code.
# Pass -file-line-error first, since it's the more important one (texexec
# only honors the first --passon word, it seems)
texexec      := texexec --pdf --nonstopmode --passon="-file-line-error -recorder"
run-it       := $(abspath utils/run-it.py)
# in seconds
timeout      := 30
maxkb        := 1000
versiondb    := utils/versions.d
yyyymmdd     := [12][0-9][0-9][0-9][0-9][0-9][0-9][0-9]
testbase     := test-[0-9][0-9][0-9]
# report files all end like this
rsuffix      := -$(A)-$(B).report
# which format file to look for to verify installation of new tree;
# checks metafun.mem since it doesn't go in an (unknown) engine subdir
tocheck      := metafun.mem
format       := web2c/$(tocheck)

alltexs      := $(shell find -name '$(testbase).tex')
allbases     := $(basename $(alltexs))
allreports   := $(addsuffix $(rsuffix), $(allbases))
allsummaries := $(addsuffix .summary, $(allreports))

# don't use := for these variables!
tlog     = $(basename $@).tlog
basetlog = $(notdir $(tlog))
# get extra texexec arguments for this testfile (e.g. test-001.extraargs)
eargs    = $(shell cat $*.extraargs 2> /dev/null)
# change to directory, then run texexec (allows -j parallelism)
remake   = cd $(dir $<) && $(run-it) $(timeout) $(basetlog) $(maxkb) $(texexec) $(eargs) $(notdir $<) >& $(basetlog) < /dev/null || echo "  ERROR [exit code $$?] building $@ ; see $(tlog)"
# for one-shot tempfiles
temp = $(shell mktemp)

# so that those scripts are not run.  I guess the texmf.cnf has them
# on by default.  (BTW: How to make generating missfont.log
# re-entrant?  Somehow serialize runs in each directory?)
export MKTEXTEX := 0
export MKTEXPK  := 0
export MKTEXMF  := 0
export MKTEXTFM := 0
export MKTEXFMT := 0
export MKOCP    := 0
export MKOFM    := 0

# reset TEXMFVAR, rather than TEXMFLOCAL, because it comes early
# enough in TEXMF (see /etc/texmf/texmf.cnf) to shadow the system
# paths (e.g. TEXMFSYSVAR).  If you get rid of the mostly redundant
# settings of TEXFORMATS, be sure to mkdir $(Apath)/web2c before
# running texexec with these variables, else it'll discard it as not
# writeable, then write somewhere that you probably don't want
Apath   := $(abspath ctxtrees/$(A))
Aformat := ctxtrees/$(A)/$(format)
$(Aformat) %-$(A).pdf: export TEXMFVAR   := $(Apath)
$(Aformat) %-$(A).pdf: export TEXFORMATS := $(Apath)/web2c/{$$engine,}

Bpath   := $(abspath ctxtrees/$(B))
Bformat := ctxtrees/$(B)/$(format)
$(Bformat) %-$(B).pdf: export TEXMFVAR   := $(Bpath)
$(Bformat) %-$(B).pdf: export TEXFORMATS := $(Bpath)/web2c/{$$engine,}

.PRECIOUS: %/$(format) %-$(A).pdf %-$(B).pdf %-$(A).tex %-$(B).tex
.PRECIOUS: %$(rsuffix) %.zip
.PHONY: def clean summaries veryclean

def summaries: $(allsummaries)

%.summary: %
	@if [ -s $< ]; then echo "  WARN: $<" ; awk '{print "    " $$0}' < $<; fi
	@true

# example of this target:
#   tex/context/base/unic-004.tex/test-001-20070112-20070123.report
%$(rsuffix): %-$(A).pdf %-$(B).pdf
	@echo COMPARING: $@
	@utils/compare-pdfs.sh $^ >& $@
	@true

# use separate A, B rules, else make thinks the command updates both targets
%-$(B).tex: %.tex
	@cp $< $@
%-$(A).tex: %.tex
	@cp $< $@

%-$(A).pdf: %-$(A).tex $(Aformat)
	@$(remake)
%-$(B).pdf: %-$(B).tex $(Bformat)
	@$(remake)

# get context tree from the museum, renaming it from a temp location
# to avoid partial zip files if download is interrupted
%.zip:
	mkdir -p $(@D)
	t=$(temp) && grep "https.*cont-tmf-$(@F)" $(versiondb) | awk '{print $$2}' | wget -q --no-check-certificate -nc -O $$t -i - && mv $$t $@

# unpack tree, remake formats
%/$(format): %.zip
	mkdir -p $(@D)
	cd $* && unzip -q $(abspath $<)
	texexec --make --all >& $(temp)
	mktexlsr $* >> $(temp) 2>&1
	kpsewhich $(tocheck) | grep $@

clean:
	ctxtools --purgefiles --all --recurse > /dev/null
	@find -type f -name '$(testbase)*.report'       | xargs rm -f
	@find -type f -name '$(testbase)-$(yyyymmdd)*' | xargs rm -f

veryclean: clean
	rm -fr ctxtrees/