Add scaffolding for coverletters

Makefile

@@ -1,5 +1,7 @@
 # personal resume makefile
 
+LETTERS = $(shell command ls letters/*.tex -1 | sed 's/letters\///' | sed 's/.tex//')
+
 .PHONY: help
 # Put it first so that "make" without argument is like "make help"
 # Adapted from:
@@ -10,8 +12,21 @@ help: ## List Makefile targets
 
 clean:  ## Clean up temp resources
 	rm --recursive --force publish/
-	rm Awesome-CV/*.log
+	rm --recursive --force build/
+	rm --force Awesome-CV/*.log
 
-pdf:  ## Build the resume PDF
-	mkdir --parents publish/
-	xelatex -output-directory=publish/ resume.tex content/
+resume:  ## Build the resume PDF
+	@mkdir --parents publish/
+	@xelatex -output-directory=publish/ resume.tex content/
+
+$(LETTERS):
+	@mkdir --parents publish/
+	@mkdir --parents build/
+	@cp letters/$@.tex build/coverletter-content.tex
+	@xelatex -output-directory=publish/ coverletter.tex build/
+	@mv publish/coverletter.pdf publish/coverletter-$@.pdf
+	@mv publish/coverletter.log publish/coverletter-$@.log
+	@mv publish/coverletter.out publish/coverletter-$@.out
+	@mv publish/coverletter.aux publish/coverletter-$@.aux
+
+letters: $(LETTERS);  ## Build all cover letters, or use <letter name> to build a specific letter