Makefile

# Pandoc with my options
PANDOCBIN=stack exec pandoc -- --smart --standalone --from=markdown+footnotes \
		  --filter pandoc-include-code

# Special options for ether PDF or HTML
PANDOCPDF=$(PANDOCBIN) --include-in-header header.tex
PANDOCWEB=$(PANDOCBIN) --self-contained --include-in-header header.html

# Where the output should go
OBJDIR=_gen

# Find all the lecture files -- should be laid out flat in lectures/
LECTURE_SOURCES=$(wildcard lectures/*.md)
LECTURES_PDF=$(addprefix $(OBJDIR)/, $(LECTURE_SOURCES:.md=.pdf))
LECTURES_WEB=$(addprefix $(OBJDIR)/, $(LECTURE_SOURCES:.md=.html))

GREP=grep --files-with-matches --recursive --perl-regexp
LECTURES_WITH_IMAGES=$(shell $(GREP) '.*\!\[.*\]\((.*\.dot\.png)\).*' lectures)
LECTURES_WITH_INCLUDES=$(shell $(GREP) '```\{\.\w+\s+include=(.+)\s*.*}' lectures)
SHARDS=
SHARDS+=$(LECTURES_WITH_IMAGES)
SHARDS+=$(LECTURES_WITH_INCLUDES)
# Compile a list of dependency Makefiles so that make will update the generated
# documents whenever a sub-document (diagram, code listing) changes.
LECTURES_DEP=$(addprefix $(OBJDIR)/, $(SHARDS:.md=.md.d))


all: $(LECTURES_DEP) syllabus lectures

clean:
	rm -rf $(OBJDIR)

syllabus: $(OBJDIR)/syllabus.pdf $(OBJDIR)/syllabus.html
lectures: $(LECTURES_PDF) $(LECTURES_WEB)

# The process for generating a dependency Makefile involves finding the
# sub-documents within the markdown and then ejecting them as dependencies for
# the PDFs and HTML files.
$(OBJDIR)/%.md.d: %.md
	@mkdir -p $(@D) # Make the directory required for the target
	@echo Building $@ ...
	$(eval PDF := $(OBJDIR)/$(<:.md=.pdf))
	$(eval HTML := $(OBJDIR)/$(<:.md=.html))
	@# Find the dot-made diagrams in files
	@perl -ne 'print "$(PDF) $(HTML): $$1"."\n" if s/.*!\[.*\]\((.*\.dot\.png)\).*/\1/p' $< > $@
	@# Find the included code in files
	@perl -ne 'print "$(PDF) $(HTML): $$1"."\n" if s/```\{\.\w+\s+include=(.+)\s*.*}/\1/g' $< >> $@

$(OBJDIR)/%.dot.png: %.dot
	@mkdir -p $(@D) # Make the directory required for the target
	dot -Tpng $< -o $@

$(OBJDIR)/%.pdf: %.md header.tex
	@mkdir -p $(@D)
	@echo Building $@ ...
	@$(PANDOCPDF) -s $< -o $@

$(OBJDIR)/%.html: %.md header.html
	@mkdir -p $(@D)
	@echo Building $@ ...
	@$(PANDOCWEB) -s $< -o $@

# The minus sign suppresses errors, which happen on a clean make
-include $(LECTURES_DEP)

# Use POSIX versions of make features
.POSIX:

# These targets do not produce object files of those names, so they must be
# phony targets.
.PHONY: all clean syllabus lectures