# -*- makefile -*-
  # Makefile for Sphinx documentation
  #

  subdir-y := devicetree/bindings/

  # Check for broken documentation file references
  ifeq ($(CONFIG_WARN_MISSING_DOCUMENTS),y)
  $(shell $(srctree)/scripts/documentation-file-ref-check --warn)
  endif

  # You can set these variables from the command line.
  SPHINXBUILD   = sphinx-build
  SPHINXOPTS    =
  SPHINXDIRS    = .
  _SPHINXDIRS   = $(patsubst $(srctree)/Documentation/%/conf.py,%,$(wildcard $(srctree)/Documentation/*/conf.py))
  SPHINX_CONF   = conf.py
  PAPER         =
  BUILDDIR      = $(obj)/output
  PDFLATEX      = xelatex
  LATEXOPTS     = -interaction=batchmode
  
  # User-friendly check for sphinx-build
  HAVE_SPHINX := $(shell if which $(SPHINXBUILD) >/dev/null 2>&1; then echo 1; else echo 0; fi)
  
  ifeq ($(HAVE_SPHINX),0)
  
  .DEFAULT:
  	$(warning The '$(SPHINXBUILD)' command was not found. Make sure you have Sphinx installed and in PATH, or set the SPHINXBUILD make variable to point to the full path of the '$(SPHINXBUILD)' executable.)

  	@echo

  	@$(srctree)/scripts/sphinx-pre-install

  	@echo "  SKIP    Sphinx $@ target."
  
  else # HAVE_SPHINX

  export SPHINXOPTS = $(shell perl -e 'open IN,"sphinx-build --version 2>&1 |"; while (<IN>) { if (m/([\d\.]+)/) { print "-jauto" if ($$1 >= "1.7") } ;} close IN')

  # User-friendly check for pdflatex and latexmk

  HAVE_PDFLATEX := $(shell if which $(PDFLATEX) >/dev/null 2>&1; then echo 1; else echo 0; fi)

  HAVE_LATEXMK := $(shell if which latexmk >/dev/null 2>&1; then echo 1; else echo 0; fi)
  
  ifeq ($(HAVE_LATEXMK),1)
  	PDFLATEX := latexmk -$(PDFLATEX)
  endif #HAVE_LATEXMK

  
  # Internal variables.
  PAPEROPT_a4     = -D latex_paper_size=a4
  PAPEROPT_letter = -D latex_paper_size=letter
  KERNELDOC       = $(srctree)/scripts/kernel-doc
  KERNELDOC_CONF  = -D kerneldoc_srctree=$(srctree) -D kerneldoc_bin=$(KERNELDOC)
  ALLSPHINXOPTS   =  $(KERNELDOC_CONF) $(PAPEROPT_$(PAPER)) $(SPHINXOPTS)
  # the i18n builder cannot share the environment and doctrees with the others
  I18NSPHINXOPTS  = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) .
  
  # commands; the 'cmd' from scripts/Kbuild.include is not *loopable*
  loop_cmd = $(echo-cmd) $(cmd_$(1)) || exit;
  
  # $2 sphinx builder e.g. "html"
  # $3 name of the build subfolder / e.g. "media", used as:
  #    * dest folder relative to $(BUILDDIR) and
  #    * cache folder relative to $(BUILDDIR)/.doctrees
  # $4 dest subfolder e.g. "man" for man pages at media/man
  # $5 reST source folder relative to $(srctree)/$(src),
  #    e.g. "media" for the linux-tv book-set at ./Documentation/media
  
  quiet_cmd_sphinx = SPHINX  $@ --> file://$(abspath $(BUILDDIR)/$3/$4)
        cmd_sphinx = $(MAKE) BUILDDIR=$(abspath $(BUILDDIR)) $(build)=Documentation/media $2 && \
  	PYTHONDONTWRITEBYTECODE=1 \
  	BUILDDIR=$(abspath $(BUILDDIR)) SPHINX_CONF=$(abspath $(srctree)/$(src)/$5/$(SPHINX_CONF)) \
  	$(SPHINXBUILD) \
  	-b $2 \
  	-c $(abspath $(srctree)/$(src)) \
  	-d $(abspath $(BUILDDIR)/.doctrees/$3) \
  	-D version=$(KERNELVERSION) -D release=$(KERNELRELEASE) \
  	$(ALLSPHINXOPTS) \
  	$(abspath $(srctree)/$(src)/$5) \
  	$(abspath $(BUILDDIR)/$3/$4)
  
  htmldocs:

  	@$(srctree)/scripts/sphinx-pre-install --version-check

  	@+$(foreach var,$(SPHINXDIRS),$(call loop_cmd,sphinx,html,$(var),,$(var)))
  
  linkcheckdocs:
  	@$(foreach var,$(SPHINXDIRS),$(call loop_cmd,sphinx,linkcheck,$(var),,$(var)))
  
  latexdocs:

  	@$(srctree)/scripts/sphinx-pre-install --version-check

  	@+$(foreach var,$(SPHINXDIRS),$(call loop_cmd,sphinx,latex,$(var),latex,$(var)))
  
  ifeq ($(HAVE_PDFLATEX),0)
  
  pdfdocs:
  	$(warning The '$(PDFLATEX)' command was not found. Make sure you have it installed and in PATH to produce PDF output.)
  	@echo "  SKIP    Sphinx $@ target."
  
  else # HAVE_PDFLATEX
  
  pdfdocs: latexdocs

  	@$(srctree)/scripts/sphinx-pre-install --version-check

  	$(foreach var,$(SPHINXDIRS), $(MAKE) PDFLATEX="$(PDFLATEX)" LATEXOPTS="$(LATEXOPTS)" -C $(BUILDDIR)/$(var)/latex || exit;)

  
  endif # HAVE_PDFLATEX
  
  epubdocs:

  	@$(srctree)/scripts/sphinx-pre-install --version-check

  	@+$(foreach var,$(SPHINXDIRS),$(call loop_cmd,sphinx,epub,$(var),epub,$(var)))
  
  xmldocs:

  	@$(srctree)/scripts/sphinx-pre-install --version-check

  	@+$(foreach var,$(SPHINXDIRS),$(call loop_cmd,sphinx,xml,$(var),xml,$(var)))
  
  endif # HAVE_SPHINX
  
  # The following targets are independent of HAVE_SPHINX, and the rules should
  # work or silently pass without Sphinx.

  refcheckdocs:
  	$(Q)cd $(srctree);scripts/documentation-file-ref-check

  cleandocs:
  	$(Q)rm -rf $(BUILDDIR)
  	$(Q)$(MAKE) BUILDDIR=$(abspath $(BUILDDIR)) $(build)=Documentation/media clean
  
  dochelp:
  	@echo  ' Linux kernel internal documentation in different formats from ReST:'
  	@echo  '  htmldocs        - HTML'
  	@echo  '  latexdocs       - LaTeX'
  	@echo  '  pdfdocs         - PDF'
  	@echo  '  epubdocs        - EPUB'
  	@echo  '  xmldocs         - XML'
  	@echo  '  linkcheckdocs   - check for broken external links (will connect to external hosts)'

  	@echo  '  refcheckdocs    - check for references to non-existing files under Documentation'

  	@echo  '  cleandocs       - clean all generated files'
  	@echo
  	@echo  '  make SPHINXDIRS="s1 s2" [target] Generate only docs of folder s1, s2'
  	@echo  '  valid values for SPHINXDIRS are: $(_SPHINXDIRS)'
  	@echo
  	@echo  '  make SPHINX_CONF={conf-file} [target] use *additional* sphinx-build'
  	@echo  '  configuration. This is e.g. useful to build with nit-picking config.'

  	@echo
  	@echo  '  Default location for the generated documents is Documentation/output'