todo.sh: Generate version info at dist time.

When generating the distribution files, prepare todo.sh
by subbing in the current version so that users will
get a proper version number.

Tries to detect VERSION-FILE for running from
the development directory but this doesn't work well
when $PWD is not the top of the git repo.

Signed-off-by: Emil Sit <sit@emilsit.net>

Makefile

@@ -13,12 +13,13 @@ VERSION-FILE: .FORCE-VERSION-FILE
 todo.sh: VERSION-FILE
 
 # For packaging
-DISTFILES := README todo.cfg todo.sh
+DISTFILES := README todo.cfg
 
 DISTNAME=todo.sh-$(VERSION)
 dist: $(DISTFILES) todo.sh
 	mkdir -p $(DISTNAME)
 	cp -f $(DISTFILES) $(DISTNAME)/
+	sed -e 's/@DEV_VERSION@/'$(VERSION)'/' todo.sh > $(DISTNAME)/todo.sh
 	tar cf $(DISTNAME).tar $(DISTNAME)/
 	gzip -f -9 $(DISTNAME).tar
 	zip -9r $(DISTNAME).zip $(DISTNAME)/