X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=topbloke-formulae.git;a=blobdiff_plain;f=Makefile;h=7a4f7d4f0dec6fe44aba5ee66feee96a205859e4;hp=8bd84b3ea7214db1a1719fad188214b3a10cbfd9;hb=504314d4eb8beba3ea97850f02e89500bfd9b2bf;hpb=0a0e7dc7722547a9ae7f9f30de4a98d0260c905a

diff --git a/Makefile b/Makefile
index 8bd84b3..7a4f7d4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,12 +1,20 @@
 
 SRCS := $(wildcard *.tex)
 
-default: final.pdf
+default: final.pdf final.ps
 
-once:
+once:		revid.inc
 		pdflatex -halt-on-error article.tex </dev/null
 
-final.pdf: $(SRCS)
+GITDIR:=$(addsuffix /, $(shell git rev-parse --git-dir))
+HEADREF:=$(shell git symbolic-ref HEAD 2>/dev/null)
+HEADDEPS:=$(addprefix $(GITDIR), HEAD $(HEADREF))
+
+revid.inc:	.git-revid $(SRCS) Makefile $(HEADDEPS)
+		./$< >$@.new
+		cmp $@.new $@ || mv -f $@.new $@
+
+final.pdf: $(SRCS) revid.inc
 		$(MAKE) once
 		$(MAKE) once
 		$(MAKE) once
@@ -16,4 +24,4 @@ final.pdf: $(SRCS)
 		pdftops $*.pdf $*.ps
 
 clean:
-	rm -f *.aux *.log *.dvi *.out *.pdf *~
+	rm -f *.aux *.log *.dvi *.out *.pdf *.ps *~