Add Makefile, regenerate PDFs

info/exercises/Makefile

+.PHONY = all clean
+
+OUT_DIR ?= $(shell dirname $(realpath $(firstword $(MAKEFILE_LIST))))
+
+DIRS := $(wildcard src/ex-??)
+
+EXPDFS := $(patsubst src/ex-%,ex-%.pdf,$(DIRS))
+SOLPDFS := $(patsubst src/ex-%,ex-%-sol.pdf,$(DIRS))
+
+all: $(EXPDFS) $(SOLPDFS)
+
+ex-%.pdf: src/ex-%/main.tex
+	cd src/ex-$* && \
+	lualatex -jobname=ex-$* "\def\ANSWERS{0}\input{main.tex}" && \
+	cp ex-$*.pdf $(OUT_DIR)/ex-$*.pdf
+
+ex-%-sol.pdf: src/ex-%/main.tex
+	cd src/ex-$* && \
+	lualatex -jobname=ex-$*-sol "\def\ANSWERS{1}\input{main.tex}" && \
+	cp ex-$*-sol.pdf $(OUT_DIR)/ex-$*-sol.pdf 
+
+clean:
+	rm -f $(EXPDFS) $(SOLPDFS)
+	for d in $(DIRS); do \
+		cd $$d && rm -f *.aux *.log *.out main.pdf; \
+	done

info/exercises/src/ex-01/main.tex

@@ -2,7 +2,9 @@
 
 \input{../macro}
 
-% \printanswers
+\if\ANSWERS1
+  \printanswers
+\fi
 
 \title{CS 320 \\ Computer Language Processing\\Exercises: Weeks 1 and 2}
 \author{}