make snapshot

Makefile.include

@@ -88,7 +88,7 @@ else ifneq ($(wildcard .svn/entries),)
 endif
 
 # .PHONY names all targets that aren't filenames
-.PHONY: all clean pdf view
+.PHONY: all clean pdf view snapshot
 
 all: pdf $(AFTERALL)
 
@@ -128,6 +128,11 @@ endif
 	@while grep -q "Rerun to" $*.log; do \
 		$(PDFLATEX) $* $(ERRFILTER); done
 
+DRAFTS := $(PDFTARGETS:.pdf=-$(REVISION).pdf)
+$(DRAFTS): %-$(REVISION).pdf: %.pdf
+	cp $< $@
+snapshot: $(DRAFTS)
+
 clean:
 	$(RM) $(foreach T,$(PDFTARGETS:.pdf=), \
 		$(T).out $(T).pdf $(T).blg $(T).bbl \

README.md

@@ -21,3 +21,5 @@ Features:
   command you can use in your LaTeX markup to include a current revision
   identifier.  Useful for circulating drafts for comment.
 * `make view` opens your typeset document.
+* To generate a draft with the revision number in its filename (to pass
+  around), use `make snapshot`.