build/graphviz-filter.conf: add config for svgs

Add a custom graphviz-filter.conf, so asciidoc instructs graphviz to
generate svgs.

Related: SYS#6380
Change-Id: Iee54012c41f554608b0915d707f7cf64bfbdc418

build/Makefile.asciidoc.inc

@@ -38,7 +38,14 @@ CLEAN_FILES += $(ASCIIDOC_PDF) $(ASCIIDOC_NAME:%=%.html)
 UPLOAD_FILES += $(ASCIIDOC_PDF)
 
 ABS_SRCDIR := $(or $(abs_srcdir),$(shell realpath $(srcdir)))
-ASCIIDOC_OPTS := -f $(BUILDDIR)/mscgen-filter.conf -f $(BUILDDIR)/diag-filter.conf -f $(BUILDDIR)/docinfo-releaseinfo.conf -a srcdir='$(ABS_SRCDIR)' -a commondir='$(COMMONDIR)'
+ASCIIDOC_OPTS := \
+	-f $(BUILDDIR)/mscgen-filter.conf \
+	-f $(BUILDDIR)/diag-filter.conf \
+	-f $(BUILDDIR)/docinfo-releaseinfo.conf \
+	-f $(BUILDDIR)/graphviz-filter.conf \
+	-a srcdir='$(ABS_SRCDIR)' \
+	-a commondir='$(COMMONDIR)' \
+	$(NULL)
 DBLATEX_OPTS := -s $(ASCIIDOCSTYLE) -P draft.mode=yes -P draft.watermark=0
 
 ifeq (,$(BUILD_RELEASE))

build/graphviz-filter.conf

@@ -0,0 +1,24 @@
+#
+# AsciiDoc Graphviz filter configuration file.
+#
+
+[graphviz-filter-style]
+graphviz-style=template="graphviz{format?-{format}}-block",subs=(),posattrs=("style","target","layout","format"),filter='dot -o "{outdir={indir}}/{imagesdir=}{imagesdir?/}{target}" -T {format=svg} && echo " "'
+
+[blockdef-open]
+template::[graphviz-filter-style]
+
+[blockdef-listing]
+template::[graphviz-filter-style]
+
+[paradef-default]
+template::[graphviz-filter-style]
+
+[graphviz-block]
+template::[filter-image-svgblockmacro]
+
+[filter-image-svgblockmacro]
+{target%}{counter2:target-number}
+{target%}{set2:target:{docname}__{target-number}.svg}
+|
+template::[image-blockmacro]