Adding rule for building R Markdown files

# Files.

SRC_PAGES = $(wildcard *.md)

MARKDOWN = $(wildcard *.md)

EXCLUDES = README.md LAYOUT.md FAQ.md DESIGN.md

SRC_PAGES = $(filter-out $(EXCLUDES), $(MARKDOWN))

DST_PAGES = $(patsubst %.md,%.html,$(SRC_PAGES))

# Pandoc filters

FILTERS = $(wildcard tools/filters/*.py)

# Inclusions.

INCLUDES = \

	-Vheader="$$(cat _includes/header.html)" \

	-o $@ $<

# Pattern to build a generic page.

%.html : %.md _layouts/page.html

%.html : %.md _layouts/page.html $(FILTERS)

	pandoc -s -t html \

	--template=_layouts/page \

	--filter=tools/filters/blockquote2div.py \

	$(INCLUDES) \

	-o $@ $<

# Pattern to convert R Markdown to Markdown.

%.md: %.Rmd $(R_CHUNK_OPTS)

	Rscript -e "knitr::knit('$$(basename $<)', output = '$$(basename $@)')"

## unittest : Run unit test (for Python 2 and 3)

unittest: tools/check.py tools/validation_helpers.py tools/test_check.py

	cd tools/ && python2 test_check.py