Makefile that uses Pandoc to generate HTML, PDF, DOCX, etc. from Markdown source files

Makefile

# Makefile
#
# Credits: https://gist.github.com/kristopherjohnson/7466917
# 
# Converts Markdown to other formats using Pandoc (https://pandoc.org/)
#
# Convert a single Markdown file to a specific format:
# $ make <filename>.<format_suffix>
#
# Convert all Markdown files to a specific format:
# $ make <format_suffix>
#
# Convert all Markdown files to all possible formats:
# $ make [all]
#
# Delete all generated files:
# $ make clean

# Convert all files in this directory that have a .md suffix
SOURCE_DOCS = $(wildcard *.md)

# Depend on all images (https://stackoverflow.com/a/14289872)
DEPS = $(shell find images | sed 's/ /\\ /g')

# Depend on bibliography and Citation Style Language format files
# CSL repository: https://github.com/citation-style-language/styles
PDF_DEPS = $(wildcard *.bib) $(wildcard *.csl)

# Possible document types
DOCX = $(SOURCE_DOCS:.md=.docx)
EPUB = $(SOURCE_DOCS:.md=.epub)
HTML = $(SOURCE_DOCS:.md=.html)
ODT = $(SOURCE_DOCS:.md=.odt)
PDF = $(SOURCE_DOCS:.md=.pdf)
RTF = $(SOURCE_DOCS:.md=.rtf)
TEX = $(SOURCE_DOCS:.md=.tex)

# All document types
# Change this line to set only those document types needed
EXPORTED_DOCS = $(DOCX) $(EPUB) $(HTML) $(ODT) $(PDF) $(RTF) $(TEX)

RM=/usr/bin/env rm
PANDOC=/usr/bin/env pandoc

PANDOC_OPTIONS=
PANDOC_DOCX_OPTIONS=
PANDOC_EPUB_OPTIONS=--to epub3
PANDOC_HTML_OPTIONS=--to html5
PANDOC_ODT_OPTIONS=
PANDOC_PDF_OPTIONS=
PANDOC_RTF_OPTIONS=
PANDOC_TEX_OPTIONS=$(PANDOC_PDF_OPTIONS)

# Pattern-matching Rules

%.docx : %.md $(DEPS)
	$(PANDOC) $(PANDOC_OPTIONS) $(PANDOC_DOCX_OPTIONS) -o $@ $<

%.epub : %.md $(DEPS)
	$(PANDOC) $(PANDOC_OPTIONS) $(PANDOC_EPUB_OPTIONS) -o $@ $<

%.html : %.md $(DEPS)
	$(PANDOC) $(PANDOC_OPTIONS) $(PANDOC_HTML_OPTIONS) -o $@ $<

%.odt : %.md $(DEPS)
	$(PANDOC) $(PANDOC_OPTIONS) $(PANDOC_ODT_OPTIONS) -o $@ $<

%.pdf : %.md $(DEPS) $(PDF_DEPS)
	$(PANDOC) $(PANDOC_OPTIONS) $(PANDOC_PDF_OPTIONS) -o $@ $<

%.rtf : %.md $(DEPS)
	$(PANDOC) $(PANDOC_OPTIONS) $(PANDOC_RTF_OPTIONS) -o $@ $<

%.tex : %.md $(DEPS) $(TEX_DEPS)
	$(PANDOC) $(PANDOC_OPTIONS) $(PANDOC_TEX_OPTIONS) -o $@ $<


# Targets and dependencies

.PHONY: all docx epub html odt pdf rtf tex clean

all: $(EXPORTED_DOCS)

docx: $(DOCX)

epub: $(EPUB)

html: $(HTML)

odt: $(ODT)

pdf: $(PDF)

rtf: $(RTF)

tex: $(TEX)

clean:
	- $(RM) $(EXPORTED_DOCS)