X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=topbloke-formulae.git;a=blobdiff_plain;f=Makefile;h=88cfc3b873c973fdd36bab1232b5e6de80edb954;hp=06554a21e071aaf9471db79fd1450227f023056c;hb=cb5a9d3227f121506751f47f098e53ced767a278;hpb=c64e0ac0cc6636944b2cdc30e28c18a73305c47a

diff --git a/Makefile b/Makefile
index 06554a2..88cfc3b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,27 @@
 
-default: article.pdf
+SRCS := $(wildcard *.tex)
 
-article.pdf: article.tex
-		pdflatex -halt-on-error $< </dev/null
+default: final.pdf
 
-article.ps: article.pdf
-		pdftops article.pdf article.ps
+once:		revid.inc
+		pdflatex -halt-on-error article.tex </dev/null
+
+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
+		cp article.pdf final.pdf
+
+%.ps: %.pdf
+		pdftops $*.pdf $*.ps
 
 clean:
-	rm -f *.aux *.log *.dvi *.out *.pdf *~
+	rm -f *.aux *.log *.dvi *.out *.pdf *.ps *~