Store intermediate files in separate build directory

.gitignore

@@ -7,3 +7,4 @@
 *.synctex.gz
 /presentations/*.pdf
 /presentations/auto
+/presentations/build/

Makefile

@@ -1,17 +1,23 @@
 PRESENTATIONS=$(patsubst %.tex, %.pdf, $(wildcard presentations/*.tex))
+BUILD_DIR=build
+BUILD_DECKS=$(subst presentations, presentations/$(BUILD_DIR), $(wildcard presentations/content/*))
+LATEX=pdflatex -output-directory $(BUILD_DIR)
 
 all: ${PRESENTATIONS}
 
 clean:
-	rm -f presentations/*.log
-	rm -f presentations/*.out
-	rm -f presentations/*.nav
-	rm -f presentations/*.aux
-	rm -f presentations/*.snm
-	rm -f presentations/*.toc
+	rm -fr presentations/$(BUILD_DIR)
+
+distclean: clean
+	rm -f presentations/*.pdf
+
+.SECONDARY: $(BUILD_DECKS)
+presentations/$(BUILD_DIR)/%:
+	mkdir -p $@
 
 .ONESHELL:
-presentations/%.pdf : presentations/%.tex
+presentations/%.pdf : presentations/%.tex $(BUILD_DECKS)
 	cd presentations
-	pdflatex $(notdir $<)
-	pdflatex $(notdir $<)
+	$(LATEX) $(notdir $<)
+	$(LATEX) $(notdir $<)
+	mv $(BUILD_DIR)/$*.pdf .