generic Makefile using latexmk and/or pandoc

Makefile

# (c) 2018 Facundo Muñoz
# Latex Makefile using latexmk
# Modified by Dogukan Cagatay <dcagatay@gmail.com>
# Originally from : http://tex.stackexchange.com/a/40759
# Modified for compilation of Markdown files with ideas from
# http://plain-text.co/pull-it-together.html

## What extension (e.g. md, markdown, mdown) is being used 
## for markdown files MEXT = md
MEXT = md

## Expands to a list of all markdown files in the working directory
SRC = $(wildcard *.$(MEXT))

## working bibliography file (make sure there is only one)
BIB = $(wildcard *.bib)

## Target file names with extensions (use substitution references)
## x.pdf depends on x.md, x.html depends on x.md, etc
## https://www.gnu.org/software/make/manual/make.html#Substitution-Refs
## pdfs can be built from all md and tex files
## the sort function removes duplicates
PDF_TEX = $(SRC:.tex=.pdf)
PDF_MD = $(SRC:.md=.pdf)
PDFS = $(sort $(PDF_MD) $(PDF_TEX))
HTML = $(SRC:.md=.html)
TEX = $(SRC:.md=.tex)
DOCX = $(SRC:.md=.docx)


## Compile commands

# MAIN LATEXMK RULE
# -pdf tells latexmk to generate PDF directly (instead of DVI).
# -pdflatex="" tells latexmk to call a specific backend with specific options.
# -use-make tells latexmk to call make for generating missing files.
# -interactive=nonstopmode keeps the pdflatex backend from stopping at a
# missing file reference and interactively asking you for an alternative.
LATEXMK = latexmk -use-make -pdf -pdflatex="pdflatex -interactive=nonstopmode" 

PANDOC  = pandoc -V papersize:a4 -V urlcolor:blue \
	--from markdown+autolink_bare_uris+simple_tables+table_captions+yaml_metadata_block

ifeq ($(strip $(BIB)),)
else
	PANDOC += --filter pandoc-citeproc --bibliography=$(BIB)
endif


# You want latexmk to *always* run, because make does not have all the info.
# Also, include non-file targets in .PHONY so they are run regardless of any
# file of the given name existing.
.PHONY: $(PDF_TEX) all clean bib

## Rules -- make all, make pdf, make html. The `clean` rule is below.
# The first rule in a Makefile is the one executed by default ("make"). It
# should always be the "all" rule, so that "make" and "make all" are identical.
## all:    $(PDFS) $(HTML) $(TEX) $(DOCX)
all: clean bib $(PDFS)
pdf:    clean bib $(PDFS)
html:   $(HTML)
tex:    $(TEX)
docx:   $(DOCX)


## Implicit rules
## https://www.gnu.org/software/make/manual/html_node/Using-Implicit.html#Using-Implicit
## Each implicit rule has a target pattern and prerequisite patterns.
## There may be many implicit rules with the same target pattern
## The rule that actually applies is the one whose prerequisites exist or can be made

## '$@' is a variable holding the name of the target,
## and '$<' is a variable holding the (first) dependency of a rule.

%.pdf: %.md
	$(PANDOC) -o $@ $<

%.pdf: %.tex
	$(LATEXMK) $<

cleanall:
	latexmk -C

clean:
	-latexmk -c


# download publications with bib tag from CiteULike
# the first download must be manual so that the bib file exists a priori
# from whose name the tag is taken
bib:
ifeq ($(strip $(BIB)),)
else
	wget http://www.citeulike.org/bibtex/user/famuvie/tag/$(basename $(BIB)) -O $(BIB)
	# use UTF8 accented letters which renders better
	sed -i 's/\\'\''{\\i}/í/g' $(BIB)
	# remove URLs containing amazon or worldcat
	sed -i '/amazon\|worldcat/d' $(BIB)
endif