[RFC PATCH] docs-rst: move the rules for svg and graphviz to Makefile.sphinx

From: Mauro Carvalho Chehab
Date: Mon Nov 21 2016 - 04:49:01 EST

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Not only media documents may have images. So, move the
rules for building images from graphviz and from SVG to
the Documentation makefile.

With this change, if some Documentation subdir "foo"
can now specify that he has SVG and/or DOT source images
that are included inside the documentation.

All it is needed is to create a Documentation/foo/Makefile with:

DOTS += foo/bar.dot
IMAGES += foo/foobar.svg

and, at Makefile.sphinx, add a:

include foo/Makefile

The build system will generate the SVG image "bar.svg" from
the graphviz "bar.dot" document for all documentation targets.

If the documentation target is latexdocs or pdfdocs, it will
also produce a "bar.pdf" image from "bar.svg", and a "foobar.pdf"
from a SVG source image called "foobar.svg".

Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
---

NOTE:
====

This is a RFC patch, based on this patch series:
https://lkml.org/lkml/2016/11/20/89

If you think it is worth, I'll write a documentation patch for the doc-guide/
providing a complete guide about how to add an image at the Kernel's
documentation.

Documentation/Makefile.sphinx | 41 ++++++++++++++++-----
Documentation/media/Makefile | 83 ++++++++++++++++---------------------------
2 files changed, 63 insertions(+), 61 deletions(-)

diff --git a/Documentation/Makefile.sphinx b/Documentation/Makefile.sphinx
index 707c65337ebf..adc24ffa4c6a 100644
--- a/Documentation/Makefile.sphinx
+++ b/Documentation/Makefile.sphinx
@@ -2,6 +2,8 @@
# Makefile for Sphinx documentation
#

+include Documentation/media/Makefile
+
# You can set these variables from the command line.
SPHINXBUILD = sphinx-build
SPHINXOPTS =
@@ -13,6 +15,29 @@ BUILDDIR = $(obj)/output
PDFLATEX = xelatex
LATEXOPTS = -interaction=batchmode

+# Handle SVG and graphviz images
+
+DOTTGT := $(patsubst %.dot,%.svg,$(DOTS))
+IMGDOT := $(patsubst %,$(srctree)/Documentation/%,$(DOTTGT))
+
+IMGTGT := $(patsubst %.svg,%.pdf,$(IMAGES))
+IMGPDF := $(patsubst %,$(srctree)/Documentation/%,$(IMGTGT))
+
+cmd = $(echo-cmd) $(cmd_$(1))
+
+quiet_cmd_genpdf = GENPDF $2
+ cmd_genpdf = convert $2 $3
+
+quiet_cmd_gendot = DOT $2
+ cmd_gendot = dot -Tsvg $2 > $3
+
+%.pdf: %.svg
+ @$(call cmd,genpdf,$<,$@)
+
+%.svg: %.dot
+ @$(call cmd,gendot,$<,$@)
+
+
# User-friendly check for sphinx-build
HAVE_SPHINX := $(shell if which $(SPHINXBUILD) >/dev/null 2>&1; then echo 1; else echo 0; fi)

@@ -54,7 +79,7 @@ loop_cmd = $(echo-cmd) $(cmd_$(1))
# 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;\
+ cmd_sphinx = $(MAKE) BUILDDIR=$(abspath $(BUILDDIR)) $(build)=Documentation/media mediaheaders;\
BUILDDIR=$(abspath $(BUILDDIR)) SPHINX_CONF=$(abspath $(srctree)/$(src)/$5/$(SPHINX_CONF)) \
$(SPHINXBUILD) \
-b $2 \
@@ -65,10 +90,10 @@ quiet_cmd_sphinx = SPHINX $@ --> file://$(abspath $(BUILDDIR)/$3/$4)
$(abspath $(srctree)/$(src)/$5) \
$(abspath $(BUILDDIR)/$3/$4);

-htmldocs:
+htmldocs: $(IMGDOT)
@$(foreach var,$(SPHINXDIRS),$(call loop_cmd,sphinx,html,$(var),,$(var)))

-latexdocs:
+latexdocs: $(IMGPDF)
@$(foreach var,$(SPHINXDIRS),$(call loop_cmd,sphinx,latex,$(var),latex,$(var)))

ifeq ($(HAVE_PDFLATEX),0)
@@ -79,15 +104,15 @@ pdfdocs:

else # HAVE_PDFLATEX

-pdfdocs: latexdocs
+pdfdocs: latexdocs $(IMGPDF)
$(foreach var,$(SPHINXDIRS), $(MAKE) PDFLATEX=$(PDFLATEX) LATEXOPTS="$(LATEXOPTS)" -C $(BUILDDIR)/$(var)/latex;)

endif # HAVE_PDFLATEX

-epubdocs:
+epubdocs: $(IMGDOT)
@$(foreach var,$(SPHINXDIRS),$(call loop_cmd,sphinx,epub,$(var),epub,$(var)))

-xmldocs:
+xmldocs: $(IMGDOT)
@$(foreach var,$(SPHINXDIRS),$(call loop_cmd,sphinx,xml,$(var),xml,$(var)))

# no-ops for the Sphinx toolchain
@@ -97,8 +122,8 @@ mandocs:
installmandocs:

cleandocs:
- $(Q)rm -rf $(BUILDDIR)
- $(Q)$(MAKE) BUILDDIR=$(abspath $(BUILDDIR)) -C Documentation/media clean
+ $(Q)rm -rf $(BUILDDIR) $(IMGDOT) $(IMGPDF)
+ $(Q)$(MAKE) BUILDDIR=$(abspath $(BUILDDIR)) -C Documentation/media mediacleandocs

endif # HAVE_SPHINX

diff --git a/Documentation/media/Makefile b/Documentation/media/Makefile
index 4d8e2ff378c4..b27c202beefb 100644
--- a/Documentation/media/Makefile
+++ b/Documentation/media/Makefile
@@ -1,54 +1,35 @@
# Rules to convert DOT and SVG to Sphinx images

-SRC_DIR=$(srctree)/Documentation/media
-
-DOTS = \
- uapi/v4l/pipeline.dot \
-
-IMAGES = \
- typical_media_device.svg \
- uapi/dvb/dvbstb.svg \
- uapi/v4l/bayer.svg \
- uapi/v4l/constraints.svg \
- uapi/v4l/crop.svg \
- uapi/v4l/fieldseq_bt.svg \
- uapi/v4l/fieldseq_tb.svg \
- uapi/v4l/nv12mt.svg \
- uapi/v4l/nv12mt_example.svg \
- uapi/v4l/pipeline.svg \
- uapi/v4l/selection.svg \
- uapi/v4l/subdev-image-processing-full.svg \
- uapi/v4l/subdev-image-processing-scaling-multi-source.svg \
- uapi/v4l/subdev-image-processing-crop.svg \
- uapi/v4l/vbi_525.svg \
- uapi/v4l/vbi_625.svg \
- uapi/v4l/vbi_hsync.svg \
-
-DOTTGT := $(patsubst %.dot,%.svg,$(DOTS))
-IMGDOT := $(patsubst %,$(SRC_DIR)/%,$(DOTTGT))
-
-IMGTGT := $(patsubst %.svg,%.pdf,$(IMAGES))
-IMGPDF := $(patsubst %,$(SRC_DIR)/%,$(IMGTGT))
-
-cmd = $(echo-cmd) $(cmd_$(1))
-
-quiet_cmd_genpdf = GENPDF $2
- cmd_genpdf = convert $2 $3
-
-quiet_cmd_gendot = DOT $2
- cmd_gendot = dot -Tsvg $2 > $3
-
-%.pdf: %.svg
- @$(call cmd,genpdf,$<,$@)
-
-%.svg: %.dot
- @$(call cmd,gendot,$<,$@)
+UAPI_V4L = media/uapi/v4l
+
+DOTS += \
+ $(UAPI_V4L)/pipeline.dot \
+
+IMAGES += \
+ media/typical_media_device.svg \
+ media/uapi/dvb/dvbstb.svg \
+ $(UAPI_V4L)/bayer.svg \
+ $(UAPI_V4L)/constraints.svg \
+ $(UAPI_V4L)/crop.svg \
+ $(UAPI_V4L)/fieldseq_bt.svg \
+ $(UAPI_V4L)/fieldseq_tb.svg \
+ $(UAPI_V4L)/nv12mt.svg \
+ $(UAPI_V4L)/nv12mt_example.svg \
+ $(UAPI_V4L)/pipeline.svg \
+ $(UAPI_V4L)/selection.svg \
+ $(UAPI_V4L)/subdev-image-processing-full.svg \
+ $(UAPI_V4L)/subdev-image-processing-scaling-multi-source.svg \
+ $(UAPI_V4L)/subdev-image-processing-crop.svg \
+ $(UAPI_V4L)/vbi_525.svg \
+ $(UAPI_V4L)/vbi_625.svg \
+ $(UAPI_V4L)/vbi_hsync.svg \

# Rules to convert a .h file to inline RST documentation

PARSER = $(srctree)/Documentation/sphinx/parse-headers.pl
-UAPI = $(srctree)/include/uapi/linux
-KAPI = $(srctree)/include/linux
+SRC_DIR= $(srctree)/Documentation/media
+UAPI = $(srctree)/include/uapi/linux
+KAPI = $(srctree)/include/linux

FILES = audio.h.rst ca.h.rst dmx.h.rst frontend.h.rst net.h.rst video.h.rst \
videodev2.h.rst media.h.rst cec.h.rst lirc.h.rst
@@ -96,16 +77,12 @@ $(BUILDDIR)/lirc.h.rst: ${UAPI}/lirc.h ${PARSER} $(SRC_DIR)/lirc.h.rst.exception

# Media build rules

-.PHONY: all html epub xml latex
+.PHONY: mediaheaders

-all: $(IMGDOT) $(BUILDDIR) ${TARGETS}
-html: all
-epub: all
-xml: all
-latex: $(IMGPDF) all
+mediaheaders: $(IMGDOT) $(BUILDDIR) ${TARGETS}

-clean:
- -rm -f $(DOTTGT) $(IMGTGT) ${TARGETS} 2>/dev/null
+mediacleandocs:
+ $(Q)rm -f ${TARGETS} 2>/dev/null

$(BUILDDIR):
$(Q)mkdir -p $@
--
2.9.3

Next message: Ingo Molnar: "Re: [PATCH 00/36] cputime: Convert core use of cputime_t to nsecs"
Previous message: Fu Wei: "Re: [PATCH v16 06/15] clocksource/drivers/arm_arch_timer: separate out arch_timer_uses_ppi init code to prepare for GTDT."
Next in thread: Daniel Vetter: "Re: [RFC PATCH] docs-rst: move the rules for svg and graphviz to Makefile.sphinx"
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