all: knit.md knit.rmarkdown.html knit.rmarkdown.pdf

# avoid loading dependencies defined in .RData or ~/.Rprofile
# http://kbroman.org/knitr_knutshell/pages/reproducible.html
R_OPTS=--no-save --no-restore --no-init-file --no-site-file --quiet

knit.md : main.Rmd
	R ${R_OPTS} -e "library(knitr); knit(input='$<', output='$@')"

knit.rmarkdown.html : knit.md
	R ${R_OPTS} -e "library(rmarkdown); render(input='$<', output_format='html_document', output_file='$@')"

# equivalent to knit.rmkardown.html:
# rmarkdown.html : main.Rmd
# 	R ${R_OPTS} -e "library(rmarkdown); render(input='$<', output_format='html_document', output_file='$@')"

knit.rmarkdown.pdf : knit.md
	R ${R_OPTS} -e "library(rmarkdown); render(input='$<', output_format='pdf_document', output_file='$@')"

# equivalent to knit.rmarkdown.pdf
# rmarkdown.pdf : main.Rmd
# 	R ${R_OPTS} -e "library(rmarkdown); render(input='$<', output_format='pdf_document', output_file='$@')"

clean :
	-trash figures
	-trash knit.md
	-trash knit.rmarkdown.html
	-trash knit.rmarkdown.pdf
	# -trash rmarkdown.html
	# -trash rmarkdown.pdf

# https://www.gnu.org/software/make/manual/html_node/Automatic-Variables.html
# https://www.rdocumentation.org/packages/rmarkdown/versions/1.3/topics/render