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###
# This makefile is used to generate the kernel documentation,
# primarily based on in-line comments in various source files.
# See Documentation/kernel-doc-nano-HOWTO.txt for instruction in how
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# to document the SRC - and how to read it.
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# To add a new book the only step required is to add the book to the
# list of DOCBOOKS.

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DOCBOOKS := z8530book.xml device-drivers.xml \
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	    kernel-hacking.xml kernel-locking.xml deviceiobook.xml \
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	    writing_usb_driver.xml networking.xml \
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	    kernel-api.xml filesystems.xml lsm.xml usb.xml kgdb.xml \
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	    gadget.xml libata.xml mtdnand.xml librs.xml rapidio.xml \
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	    genericirq.xml s390-drivers.xml uio-howto.xml scsi.xml \
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	    80211.xml debugobjects.xml sh.xml regulator.xml \
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	    alsa-driver-api.xml writing-an-alsa-driver.xml \
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	    tracepoint.xml w1.xml \
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	    writing_musb_glue_layer.xml crypto-API.xml iio.xml
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ifeq ($(DOCBOOKS),)

# Skip DocBook build if the user explicitly requested no DOCBOOKS.
.DEFAULT:
	@echo "  SKIP    DocBook $@ target (DOCBOOKS=\"\" specified)."
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else
ifneq ($(SPHINXDIRS),)
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# Skip DocBook build if the user explicitly requested a sphinx dir
.DEFAULT:
	@echo "  SKIP    DocBook $@ target (SPHINXDIRS specified)."
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else

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###
# The build process is as follows (targets):
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#              (xmldocs) [by docproc]
# file.tmpl --> file.xml +--> file.ps   (psdocs)   [by db2ps or xmlto]
#                        +--> file.pdf  (pdfdocs)  [by db2pdf or xmlto]
#                        +--> DIR=file  (htmldocs) [by xmlto]
#                        +--> man/      (mandocs)  [by xmlto]
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# for PDF and PS output you can choose between xmlto and docbook-utils tools
PDF_METHOD	= $(prefer-db2x)
PS_METHOD	= $(prefer-db2x)


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targets += $(DOCBOOKS)
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BOOKS := $(addprefix $(obj)/,$(DOCBOOKS))
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xmldocs: $(BOOKS)
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sgmldocs: xmldocs

PS := $(patsubst %.xml, %.ps, $(BOOKS))
psdocs: $(PS)

PDF := $(patsubst %.xml, %.pdf, $(BOOKS))
pdfdocs: $(PDF)

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HTML := $(sort $(patsubst %.xml, %.html, $(BOOKS)))
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htmldocs: $(HTML)
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	$(call cmd,build_main_index)
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MAN := $(patsubst %.xml, %.9, $(BOOKS))
mandocs: $(MAN)
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	find $(obj)/man -name '*.9' | xargs gzip -nf
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installmandocs: mandocs
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	mkdir -p /usr/local/man/man9/
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	find $(obj)/man -name '*.9.gz' -printf '%h %f\n' | \
		sort -k 2 -k 1 | uniq -f 1 | sed -e 's: :/:' | \
		xargs install -m 644 -t /usr/local/man/man9/
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# no-op for the DocBook toolchain
epubdocs:

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###
#External programs used
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KERNELDOCXMLREF = $(srctree)/scripts/kernel-doc-xml-ref
KERNELDOC       = $(srctree)/scripts/kernel-doc
DOCPROC         = $(objtree)/scripts/docproc
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CHECK_LC_CTYPE = $(objtree)/scripts/check-lc_ctype

# Use a fixed encoding - UTF-8 if the C library has support built-in
# or ASCII if not
LC_CTYPE := $(call try-run, LC_CTYPE=C.UTF-8 $(CHECK_LC_CTYPE),C.UTF-8,C)
export LC_CTYPE
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XMLTOFLAGS = -m $(srctree)/$(src)/stylesheet.xsl
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XMLTOFLAGS += --skip-validation
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###
# DOCPROC is used for two purposes:
# 1) To generate a dependency list for a .tmpl file
# 2) To preprocess a .tmpl file and call kernel-doc with
#     appropriate parameters.
# The following rules are used to generate the .xml documentation
# required to generate the final targets. (ps, pdf, html).
quiet_cmd_docproc = DOCPROC $@
      cmd_docproc = SRCTREE=$(srctree)/ $(DOCPROC) doc $< >$@
define rule_docproc
	set -e;								\
        $(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))';) 	\
        $(cmd_$(1)); 							\
        ( 								\
          echo 'cmd_$@ := $(cmd_$(1))'; 				\
          echo $@: `SRCTREE=$(srctree) $(DOCPROC) depend $<`; 		\
        ) > $(dir $@).$(notdir $@).cmd
endef

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%.xml: %.tmpl $(KERNELDOC) $(DOCPROC) $(KERNELDOCXMLREF) FORCE
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	$(call if_changed_rule,docproc)

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# Tell kbuild to always build the programs
always := $(hostprogs-y)

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notfoundtemplate = echo "*** You have to install docbook-utils or xmlto ***"; \
		   exit 1
db2xtemplate = db2TYPE -o $(dir $@) $<
xmltotemplate = xmlto TYPE $(XMLTOFLAGS) -o $(dir $@) $<

# determine which methods are available
ifeq ($(shell which db2ps >/dev/null 2>&1 && echo found),found)
	use-db2x = db2x
	prefer-db2x = db2x
else
	use-db2x = notfound
	prefer-db2x = $(use-xmlto)
endif
ifeq ($(shell which xmlto >/dev/null 2>&1 && echo found),found)
	use-xmlto = xmlto
	prefer-xmlto = xmlto
else
	use-xmlto = notfound
	prefer-xmlto = $(use-db2x)
endif
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# the commands, generated from the chosen template
quiet_cmd_db2ps = PS      $@
      cmd_db2ps = $(subst TYPE,ps, $($(PS_METHOD)template))
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%.ps : %.xml
	$(call cmd,db2ps)

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quiet_cmd_db2pdf = PDF     $@
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      cmd_db2pdf = $(subst TYPE,pdf, $($(PDF_METHOD)template))
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%.pdf : %.xml
	$(call cmd,db2pdf)

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index = index.html
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main_idx = $(obj)/$(index)
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quiet_cmd_build_main_index = HTML    $(main_idx)
      cmd_build_main_index = rm -rf $(main_idx); \
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		   echo '<h1>Linux Kernel HTML Documentation</h1>' >> $(main_idx) && \
		   echo '<h2>Kernel Version: $(KERNELVERSION)</h2>' >> $(main_idx) && \
		   cat $(HTML) >> $(main_idx)

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quiet_cmd_db2html = HTML    $@
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      cmd_db2html = xmlto html $(XMLTOFLAGS) -o $(patsubst %.html,%,$@) $< && \
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		echo '<a HREF="$(patsubst %.html,%,$(notdir $@))/index.html"> \
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		$(patsubst %.html,%,$(notdir $@))</a><p>' > $@
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###
# Rules to create an aux XML and .db, and use them to re-process the DocBook XML
# to fill internal hyperlinks
       gen_aux_xml = :
 quiet_gen_aux_xml = echo '  XMLREF  $@'
silent_gen_aux_xml = :
%.aux.xml: %.xml
	@$($(quiet)gen_aux_xml)
	@rm -rf $@
	@(cat $< | egrep "^<refentry id" | egrep -o "\".*\"" | cut -f 2 -d \" > $<.db)
	@$(KERNELDOCXMLREF) -db $<.db $< > $@
.PRECIOUS: %.aux.xml

%.html:	%.aux.xml
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	@(which xmlto > /dev/null 2>&1) || \
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	 (echo "*** You need to install xmlto ***"; \
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	  exit 1)
	@rm -rf $@ $(patsubst %.html,%,$@)
	$(call cmd,db2html)
	@if [ ! -z "$(PNG-$(basename $(notdir $@)))" ]; then \
            cp $(PNG-$(basename $(notdir $@))) $(patsubst %.html,%,$@); fi

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quiet_cmd_db2man = MAN     $@
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      cmd_db2man = if grep -q refentry $<; then xmlto man $(XMLTOFLAGS) -o $(obj)/man/$(*F) $< ; fi
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%.9 : %.xml
	@(which xmlto > /dev/null 2>&1) || \
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	 (echo "*** You need to install xmlto ***"; \
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	  exit 1)
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	$(Q)mkdir -p $(obj)/man/$(*F)
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	$(call cmd,db2man)
	@touch $@
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###
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# Rules to generate postscripts and PNG images from .fig format files
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quiet_cmd_fig2eps = FIG2EPS $@
      cmd_fig2eps = fig2dev -Leps $< $@

%.eps: %.fig
	@(which fig2dev > /dev/null 2>&1) || \
	 (echo "*** You need to install transfig ***"; \
	  exit 1)
	$(call cmd,fig2eps)

quiet_cmd_fig2png = FIG2PNG $@
      cmd_fig2png = fig2dev -Lpng $< $@

%.png: %.fig
	@(which fig2dev > /dev/null 2>&1) || \
	 (echo "*** You need to install transfig ***"; \
	  exit 1)
	$(call cmd,fig2png)

###
# Rule to convert a .c file to inline XML documentation
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       gen_xml = :
 quiet_gen_xml = echo '  GEN     $@'
silent_gen_xml = :
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%.xml: %.c
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	@$($(quiet)gen_xml)
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	@(                            \
	   echo "<programlisting>";   \
	   expand --tabs=8 < $< |     \
	   sed -e "s/&/\\&amp;/g"     \
	       -e "s/</\\&lt;/g"      \
	       -e "s/>/\\&gt;/g";     \
	   echo "</programlisting>")  > $@

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endif # DOCBOOKS=""
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endif # SPHINDIR=...
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###
# Help targets as used by the top-level makefile
dochelp:
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	@echo  ' Linux kernel internal documentation in different formats (DocBook):'
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	@echo  '  htmldocs        - HTML'
	@echo  '  pdfdocs         - PDF'
	@echo  '  psdocs          - Postscript'
	@echo  '  xmldocs         - XML DocBook'
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	@echo  '  mandocs         - man pages'
	@echo  '  installmandocs  - install man pages generated by mandocs'
	@echo  '  cleandocs       - clean all generated DocBook files'
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	@echo
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	@echo  '  make DOCBOOKS="s1.xml s2.xml" [target] Generate only docs s1.xml s2.xml'
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	@echo  '  valid values for DOCBOOKS are: $(DOCBOOKS)'
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	@echo
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	@echo  "  make DOCBOOKS=\"\" [target] Don't generate docs from Docbook"
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	@echo  '     This is useful to generate only the ReST docs (Sphinx)'
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###
# Temporary files left by various tools
clean-files := $(DOCBOOKS) \
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	$(patsubst %.xml, %.dvi,     $(DOCBOOKS)) \
	$(patsubst %.xml, %.aux,     $(DOCBOOKS)) \
	$(patsubst %.xml, %.tex,     $(DOCBOOKS)) \
	$(patsubst %.xml, %.log,     $(DOCBOOKS)) \
	$(patsubst %.xml, %.out,     $(DOCBOOKS)) \
	$(patsubst %.xml, %.ps,      $(DOCBOOKS)) \
	$(patsubst %.xml, %.pdf,     $(DOCBOOKS)) \
	$(patsubst %.xml, %.html,    $(DOCBOOKS)) \
	$(patsubst %.xml, %.9,       $(DOCBOOKS)) \
	$(patsubst %.xml, %.aux.xml, $(DOCBOOKS)) \
	$(patsubst %.xml, %.xml.db,  $(DOCBOOKS)) \
	$(patsubst %.xml, %.xml,     $(DOCBOOKS)) \
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	$(index)
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clean-dirs := $(patsubst %.xml,%,$(DOCBOOKS)) man
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cleandocs:
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	$(Q)rm -f $(call objectify, $(clean-files))
	$(Q)rm -rf $(call objectify, $(clean-dirs))

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# Declare the contents of the .PHONY variable as phony.  We keep that
# information in a variable se we can use it in if_changed and friends.

.PHONY: $(PHONY)