X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=topbloke-formulae.git;a=blobdiff_plain;f=Makefile;h=88cfc3b873c973fdd36bab1232b5e6de80edb954;hp=0391a54176f7d05f5e14506c1673f71e8dd2d8c7;hb=dbc2fa88cece12d33ca5788ad5d359f77676a802;hpb=3bacd8e20d8b182ded5005470c0116ef99795ca9

diff --git a/Makefile b/Makefile
index 0391a54..88cfc3b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,27 @@
 
-article.ps: article.pdf
-		pdftops article.pdf article.ps
+SRCS := $(wildcard *.tex)
 
-article.pdf: article.tex
-		pdflatex -halt-on-error $< </dev/null
+default: final.pdf
+
+once:		revid.inc
+		pdflatex -halt-on-error article.tex </dev/null
+
+GITDIR:=$(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 *~