#
# $Id$
#

#
# The name of the index file (the one which will be built by default
# without specifying a target
#
DOCUMENTS ?= index

#
# The root of the document tree, this is used to determine the directory
# of auxiliary files. The variable should be overwritten by per-directory
# Makefiles
#
ROOT_DIR ?= ../../..

#
# Output directory where files produced by XSL stylesheets should be stored,
# by default we output to the same directory, documents that are chunked may
# choose to override this to write all chunks in a subdirectory instead
#
OUTPUT_DIR ?= .

#
# Stylesheet used to generate dependencies from XML files
#
DEP_XSL ?= $(ROOT_DIR)/doc/stylesheets/dep.xsl

#
# Default stylesheet used to generate XHTML
#
XHTML_XSL ?= $(ROOT_DIR)/doc/stylesheets/xhtml.xsl

#
# Default stylesheet used to generate Drupal HTML without html headers
#
DRUPAL_XSL ?= $(ROOT_DIR)/doc/stylesheets/drupal.xsl

#
# Default stylesheet used to generate HTML
#
HTML_XSL ?= $(ROOT_DIR)/doc/stylesheets/html.chunked.xsl

#
# Stylesheet used to generate plain text documents,
# this is usually the one used for xhtml
#
TXT_XSL ?= $(ROOT_DIR)/doc/stylesheets/txt.xsl

#
# Stylesheet used to generate FO (Formatted Objects)
# This is used by PDF generators
#
FO_XSL ?= $(ROOT_DIR)/doc/stylesheets/fo.xsl

#
# Disable document validation by default
# 
VALIDATE ?= 0

CATALOG=$(ROOT_DIR)/doc/catalog.xml

LYNX     ?= lynx
DIA      ?= dia
XSLTPROC ?= xsltproc
XMLLINT ?= /usr/bin/xmllint
XEP     ?= /usr/bin/xep

LYNX_FLAGS     ?= -nolist
DIA_ARGS       ?=
XSLTPROC_FLAGS ?=
XMLLINT_FLAGS ?= --xinclude --postvalid --noout
XEP_FLAGS ?= 

ifeq ($(VALIDATE), 0)
	override XSLTPROC_FLAGS := $(XSLTPROC_FLAGS) --novalid
endif

alldep = Makefile $(ROOT_DIR)/Makefile.doc $(DEP_XSL) $(EXTRA_DEPS)

all: xhtml

xml_files = $(addsuffix .xml, $(DOCUMENTS))
dep_files = $(addsuffix .d, $(DOCUMENTS))
xhtml_files = $(addsuffix .xhtml, $(DOCUMENTS))
html_files = $(addsuffix .html, $(DOCUMENTS))
txt_files = $(addsuffix .txt, $(DOCUMENTS))
pdf_files = $(addsuffix .pdf, $(DOCUMENTS))

xhtml: $(xhtml_files)
html: $(html_files)
txt: $(txt_files)
pdf: $(pdf_files)
drupal: override HTML_XSL := $(DRUPAL_XSL)
drupal: $(html_files)


%.xhtml: %.xml %.d $(alldep) $(XHTML_XSL)
	XML_CATALOG_FILES=$(CATALOG) $(XSLTPROC) $(XSLTPROC_FLAGS) \
        --xinclude \
        --stringparam base.dir "$(OUTPUT_DIR)/" \
        --stringparam root.filename "$(basename $<)" \
        --stringparam html.ext ".xhtml" \
        $(XHTML_XSL) $<

%.html: %.xml %.d $(alldep) $(HTML_XSL)
	XML_CATALOG_FILES=$(CATALOG) $(XSLTPROC) $(XSLTPROC_FLAGS) \
        --xinclude \
        --stringparam base.dir "$(OUTPUT_DIR)/" \
        --stringparam root.filename "$(basename $<)" \
        --stringparam html.ext ".html" \
	--stringparam html.stylesheet ser.css \
        $(HTML_XSL) $<

%.fo: %.xml $(alldep) $(FO_XSL)
	XML_CATALOG_FILES=$(CATALOG) $(XSLTPROC) $(XSLTPROC_FLAGS) \
        --xinclude \
        -o $@ $(FO_XSL) $<

%.pdf: %.fo %.d $(alldep)
	$(XEP) $(XEP_FLAGS) -fo $< -pdf $@

%.txt: %.xml %.d $(alldep)
	XML_CATALOG_FILES=$(CATALOG) $(XSLTPROC) $(XSLTPROC_FLAGS) \
        --xinclude \
        $(TXT_XSL) $< | $(LYNX) $(LYNX_FLAGS) -stdin -dump > $@

%.png: %.dia $(alldep)
	$(DIA) $(DIA_ARGS) -t png -e $@ $<

%.d: %.xml $(alldep) 
	$(XSLTPROC) $(XSLTPROC_FLAGS) \
        --nonet \
        --novalid \
        --stringparam output "$@" \
        $(DEP_XSL) $< 

.PHONY: check
check: $(xml_files)
	XML_CATALOG_FILES=$(CATALOG) $(XMLLINT) $(XMLLINT_FLAGS) $<

.PHONY: clean
clean:
	@rm -f $(txt_files)
	@rm -f $(xhtml_files)
	@rm -f $(pdf_files)
	@rm -f $(html_files)

.PHONY: proper realclean distclean
proper realclean distclean: clean
	@rm -f $(dep_files) *~


ifeq (,$(MAKECMDGOALS))
include $(dep_files) 
endif
ifneq (,$(filter-out clean proper realclean distclean check, $(MAKECMDGOALS)))
include $(dep_files)
endif