################################################################################
#
# File: $Id$
#
# Standard variables and rules for building a general standalone document
# that doesn't fall into any partcular category (such as lecture, tutorial).
# The makefile assumes a single document source file. Anything more
# complex than this will need to be handled by a custom makefile.
#
# Altering these definitions will affect ALL MAKEFILES FOR ALL PAPERS!! If
# you need to do something specific for a particular paper, include a
# custom rule in its makefile. DON'T add it here!
#
################################################################################


################################################################################
#
# Include XSLT functions.
#
include $(TEACHING_SHARED)/Authoring/Handbook/make-includes/xslt_functions.make


################################################################################
#
# Required make variables. These should be defined by the calling makefile.
#
# BASE_NAMES
#	The base name(s) of the document source file(s). It may be a list, which
#	enables multiple different documents to be built by the one Makefile.
#
BASE_NAMES?=$(error The required make variable BASE_NAMES has not been defined. Please set it to the base name(s) of the document source file(s))

################################################################################
#
# Set up the context for the current document.
#
# SOURCE_XML is the original source XML, from which DERIVED_XML is
# generated (the derived source has the includes for questions, etc.,
# inserted).
#
SOURCE_XML:=$(foreach n,$(BASE_NAMES),$(n).xml)
DERIVED_XML:=$(SOURCE_XML:.xml=-derived.xml)

#
# Define the names of the output files.
#
ifdef HAS_ANSWERS
WEB_QUESTIONS_HTML:=$(SOURCE_XML:.xml=-questions.html)
WEB_ANSWERS_HTML:=$(SOURCE_XML:.xml=-answers.html)

PRINT_QUESTIONS_TEX:=$(WEB_QUESTIONS_HTML:.html=.tex)
PRINT_ANSWERS_TEX:=$(WEB_ANSWERS_HTML:.html=.tex)

PRINT_QUESTIONS_PDF_1UP:=$(PRINT_QUESTIONS_TEX:.tex=.pdf)
PRINT_ANSWERS_PDF_1UP:=$(PRINT_ANSWERS_TEX:.tex=.pdf)
PRINT_QUESTIONS_PDF_2UP:=$(PRINT_QUESTIONS_TEX:.tex=-2up.pdf)
PRINT_ANSWERS_PDF_2UP:=$(PRINT_ANSWERS_TEX:.tex=-2up.pdf)
else
WEB_HTML:=$(SOURCE_XML:.xml=.html)

PRINT_TEX:=$(SOURCE_XML:.xml=.tex)
PRINT_PDF_1UP:=$(SOURCE_XML:.xml=.pdf)
PRINT_PDF_2UP:=$(SOURCE_XML:.xml=-2up.pdf)
endif


#
# List of XSL stylesheets. If any of these change, we need to rebuild
# everything. 
#
# We can't use the resolver approach under Windows because of the DOS
# pathnames. The style sheets come out of the resolver with paths like
# C:\bar\foo\..., and make interprets the colon as an extra dependency
# delimiter (tested and behaviour verified). Of course, this works fine on
# any platform with sensible path standards. Quoting the value doesn't
# help, unfortunately. Bugger :(
#
#XSLT_STYLESHEETS:=$(shell java org.apache.xml.resolver.apps.resolver -u file:///xml2html.xsl uri | ( grep 'Result: file:' || echo '::xml2html.xsl' ) | cut -d':' -f3-) $(shell java org.apache.xml.resolver.apps.resolver -u file:///xml2latex.xsl uri | ( grep 'Result: file:' || echo '::xml2latex.xsl' ) | cut -d':' -f3-)
XSLT_STYLESHEETS:=$(TEACHING_SHARED)/Authoring/XML/xml2html.xsl $(TEACHING_SHARED)/Authoring/XML/xml2latex.xsl


################################################################################
#
# Add standard file suffixes.
#
include $(GLOBAL_HANDBOOK_INCLUDE)/standard_suffixes.make


################################################################################
#
# Standard directories.
#
IMGDIR=images


################################################################################
#
# Standard paths.
#
include $(GLOBAL_HANDBOOK_INCLUDE)/standard_paths.make


################################################################################
#
# Files to be cleaned by the various "clean" targets. Note that we don't
# "tidy" .aux files because they may be needed by the xr package for inter-
# document cross references, but won't get regenerated if the final target
# PDF files exist. They will be caught by by the "clean" target though.
#
TIDY_FILES+=*.tmp *.out *.log *.nav *.toc *.snm *.head *.dvi *-derived.xml
CLEAN_FILES+=*.aux $(IMGDIR)/*-print.pdf $(IMGDIR)/*-web.png
ifdef HAS_ANSWERS
TIDY_FILES+=$(PRINT_QUESTIONS_TEX) $(PRINT_ANSWERS_TEX)
CLEAN_FILES+=$(WEB_QUESTIONS_HTML) $(WEB_ANSWERS_HTML) \
	$(PRINT_QUESTIONS_PDF_1UP) $(PRINT_ANSWERS_PDF_1UP) \
	$(PRINT_QUESTIONS_PDF_2UP) $(PRINT_ANSWERS_PDF_2UP)
else
TIDY_FILES+=$(PRINT_TEX)
CLEAN_FILES+=$(WEB_HTML) $(PRINT_PDF_1UP) $(PRINT_PDF_2UP)
endif

################################################################################
#
# Various environment variables.
#
include $(GLOBAL_HANDBOOK_INCLUDE)/standard_environment.make
#
# List of standard "phony" build targets. Varies depending on whether
# answers are enabled.
#
TARGETS+=web print $(BASE_NAMES)
ifdef HAS_ANSWERS
TARGETS+=web-questions web-answers \
	print-questions print-answers \
	questions answers
endif
#
.PHONY: $(TARGETS)


################################################################################
#
# Build everything.
#
all: web print


################################################################################
#
# Build questions or answers only.
#
ifdef HAS_ANSWERS
questions: web-questions print-questions

answers: web-answers print-answers
endif


################################################################################
#
# Build web version only.
#
ifdef HAS_ANSWERS
web: web-questions web-answers

web-questions: $(WEB_QUESTIONS_HTML) $(WEB_IMAGES) $(WEB_FILES)

$(WEB_QUESTIONS_HTML): %-questions.html: %-derived.xml
	$(call xslt,$<,xml2html.xsl,$(call xslt_parameter,department,'$(SUBJECT_CODE)'),$(call xslt_parameter,paper,'$(PAPER_NUMBER)'),$(call xslt_parameter,standalone,'yes'),$(call xslt_parameter,showanswers,'no'),$(call xslt_parameter,base-path,'.'),$(call xslt_parameter,image-format,'png')) > $@

web-answers: $(WEB_ANSWERS_HTML) $(WEB_IMAGES) $(WEB_FILES)

$(WEB_ANSWERS_HTML): %-answers.html: %-derived.xml
	$(call xslt,$<,xml2html.xsl,$(call xslt_parameter,department,'$(SUBJECT_CODE)'),$(call xslt_parameter,paper,'$(PAPER_NUMBER)'),$(call xslt_parameter,standalone,'yes'),$(call xslt_parameter,showanswers,'yes'),$(call xslt_parameter,base-path,'.'),$(call xslt_parameter,image-format,'png')) > $@
else
web: $(WEB_HTML) $(WEB_IMAGES) $(WEB_FILES)
endif


################################################################################
#
# Build print version only.
#
ifdef HAS_ANSWERS
print: print-questions print-answers

print-questions: $(PRINT_QUESTIONS_PDF_1UP) $(PRINT_QUESTIONS_PDF_2UP)

$(PRINT_QUESTIONS_PDF_1UP): $(PRINT_IMAGES) $(PRINT_FILES)

$(PRINT_QUESTIONS_TEX): %-questions.tex: %-derived.xml
	$(call xslt,$<,xml2latex.xsl,$(call xslt_parameter,department,'$(SUBJECT_CODE)'),$(call xslt_parameter,paper,'$(PAPER_NUMBER)'),$(call xslt_parameter,standalone,'yes'),$(call xslt_parameter,showanswers,'no'),$(call xslt_parameter,base-path,'.'),$(call xslt_parameter,image-format,'pdf')) > $@

print-answers: $(PRINT_ANSWERS_PDF_1UP) $(PRINT_ANSWERS_PDF_2UP)

$(PRINT_ANSWERS_PDF_1UP): $(PRINT_IMAGES) $(PRINT_FILES)

$(PRINT_ANSWERS_TEX): %-answers.tex: %-derived.xml
	$(call xslt,$<,xml2latex.xsl,$(call xslt_parameter,department,'$(SUBJECT_CODE)'),$(call xslt_parameter,paper,'$(PAPER_NUMBER)'),$(call xslt_parameter,standalone,'yes'),$(call xslt_parameter,showanswers,'yes'),$(call xslt_parameter,base-path,'.'),$(call xslt_parameter,image-format,'pdf')) > $@
else
print: $(PRINT_PDF_1UP) $(PRINT_PDF_2UP)

$(PRINT_PDF_1UP): $(PRINT_IMAGES) $(PRINT_FILES)
endif


################################################################################
#
# Generate the derived XML source from the original XML template.
# This is done by simply running the original source through xmllint
# with the --xinclude option to process all the xi:include elements.
# The result of this could have just been piped into the XSLT processor,
# except that (a) not all of the processors support input from stdin,
# and (b) combining both xmllint and XSLT processing into one command
# means that make won't stop if there's any errors from xmllint.
#
# Sed is used to add a comment to the derived XML file, warning that this
# is generated and shouldn't be edited. Sed was used because the <?xml?>
# processing instruction MUST be on the first line. The implication here
# is that all input source files have an <?xml?> processing instruction
# (which they should anyway).
#
$(DERIVED_XML): %-derived.xml: %.xml $(XSLT_STYLESHEETS)
	xmllint --xinclude $< >$@
	@sed -i -e '1a <!-- THIS FILE IS AUTOMATICALLY GENERATED. DO NOT EDIT! -->' $@
		

################################################################################
#
# Build the test document.
#
test: test.pdf

test.pdf: test.tex


################################################################################
#
# Debugging: print the values of the standard variables.
#
debug:
	@announce Externally defined variables
	@echo "TEACHING_SHARED = [$(TEACHING_SHARED)]"
	@announce Internally defined variables
	@echo "GLOBAL_HANDBOOK_INCLUDE = [$(GLOBAL_HANDBOOK_INCLUDE)]"
	@echo "BASE_NAMES = [$(BASE_NAMES)]"
	@echo "SOURCE_XML = [$(SOURCE_XML)]"
	@echo "DERIVED_XML = [$(DERIVED_XML)]"
	@echo "SUBJECT_CODE = [$(SUBJECT_CODE)]"
	@echo "PAPER_NUMBER = [$(PAPER_NUMBER)]"
	@echo "HAS_ANSWERS = [$(HAS_ANSWERS)]"
ifdef HAS_ANSWERS
	@echo "WEB_QUESTIONS_HTML = [$(WEB_QUESTIONS_HTML)]"
	@echo "WEB_ANSWERS_HTML = [$(WEB_ANSWERS_HTML)]"
	@echo "PRINT_QUESTIONS_TEX = [$(PRINT_QUESTIONS_TEX)]"
	@echo "PRINT_ANSWERS_TEX = [$(PRINT_ANSWERS_TEX)]"
	@echo "PRINT_QUESTIONS_PDF_1UP = [$(PRINT_QUESTIONS_PDF_1UP)]"
	@echo "PRINT_ANSWERS_PDF_1UP = [$(PRINT_ANSWERS_PDF_1UP)]"
	@echo "PRINT_QUESTIONS_PDF_2UP = [$(PRINT_QUESTIONS_PDF_2UP)]"
	@echo "PRINT_ANSWERS_PDF_2UP = [$(PRINT_ANSWERS_PDF_2UP)]"
else
	@echo "WEB_HTML = [$(WEB_HTML)]"
	@echo "PRINT_TEX = [$(PRINT_TEX)]"
	@echo "PRINT_PDF_1UP = [$(PRINT_PDF_1UP)]"
	@echo "PRINT_PDF_2UP = [$(PRINT_PDF_2UP)]"
endif
	@echo "XSLT_STYLESHEETS = [$(XSLT_STYLESHEETS)]"
	@echo "PRINT_IMAGES = [$(PRINT_IMAGES)]"
	@echo "PRINT_FILES = [$(PRINT_FILES)]"
	@echo "WEB_IMAGES = [$(WEB_IMAGES)]"
	@echo "WEB_FILES = [$(WEB_FILES)]"
	@echo "TIDY_FILES = [$(TIDY_FILES)]"
	@echo "CLEAN_FILES = [$(CLEAN_FILES)]"
	@echo "DRAFT = [$(DRAFT)]"
	@echo "LATEX_OPTS = [$(LATEX_OPTS)]"
	@echo "TARGETS = [$(TARGETS)]"


################################################################################
#
# Clean up: get rid of all the temporary files.
#
tidy:
	rm -f $(TIDY_FILES)
#
# Clean up: get rid of everything except the original source.
#
clean: tidy
	rm -f $(CLEAN_FILES)


################################################################################
#
# List all "phony" build targets.
#
targets:
	@echo "targets: $(TARGETS)"


################################################################################
#
# Standard default rules.
#
include $(GLOBAL_HANDBOOK_INCLUDE)/standard_rules.make