BUILD_DIR=build

build: $(BUILD_DIR)/report.pdf

.PHONY: build

$(BUILD_DIR)/report.aux: report.tex references.bib
	@mkdir -p $(BUILD_DIR)
	@xelatex -interaction=nonstopmode -halt-on-error -shell-escape -output-directory=$(BUILD_DIR) report.tex

$(BUILD_DIR)/report.bbl: $(BUILD_DIR)/report.aux references.bib
	@mkdir -p $(BUILD_DIR)
	@if ! (cmp -s $(BUILD_DIR)/report.aux $(BUILD_DIR)/report.aux.old && cmp -s references.bib $(BUILD_DIR)/references.bib.old); then \
	  echo "# Rebuilding $(BUILD_DIR)/report.bbl"; \
	  bibtex $(BUILD_DIR)/report; \
	  xelatex -interaction=batchmode -halt-on-error -shell-escape -output-directory=$(BUILD_DIR) report.tex >/dev/null; \
	fi
	@cp $(BUILD_DIR)/report.aux $(BUILD_DIR)/report.aux.old
	@cp references.bib $(BUILD_DIR)/references.bib.old

$(BUILD_DIR)/report.pdf: report.tex $(BUILD_DIR)/report.bbl
	@mkdir -p $(BUILD_DIR)
	@xelatex -interaction=batchmode -halt-on-error -shell-escape -output-directory=$(BUILD_DIR) report.tex >/dev/null