GNUmakefile

   1 #
   2 # Example makefile using mjotex and a BibTeX references database.
   3 #
   4
   5 # The latex compiler.
   6 LATEX = pdflatex -file-line-error -halt-on-error
   7
   8 # The name of this document.
   9 PN = examples
  10
  11 # A space-separated list of bib files. These must all belong to paths
  12 # contained in your $BIBINPUTS environment variable.
  13 #
  14 # Leave commented if you don't use a bibliography database.
  15 #
  16 #BIBS = references.bib
  17
  18 # A space-separated list of the mjotex files that you use. The path to
  19 # mjotex must be contain in your $TEXINPUTS environment variable.
  20 MJOTEX  = mjo-algorithm.tex mjo-arrow.tex mjo-common.tex mjo-cone.tex
  21 MJOTEX += mjo-convex.tex mjo-font.tex mjo-linear_algebra.tex mjo-listing.tex
  22 MJOTEX += mjo-misc.tex mjo-proof_by_cases.tex mjo-theorem.tex
  23 MJOTEX += mjo-theorem-star.tex mjo-topology.tex
  24
  25 # Use kpsewhich (from the kpathsea suite) to find the absolute paths
  26 # of the bibtex/mjotex files listed in in $(BIBS)/$(MJOTEX). The SRCS
  27 # variable should contain all (Bib)TeX source files for the document.
  28 SRCS = $(PN).tex
  29 ifdef BIBS
  30 BIBPATHS = $(shell kpsewhich $(BIBS))
  31 SRCS += $(BIBPATHS)
  32 endif
  33 ifdef MJOTEX
  34 MJOTEXPATHS = $(shell kpsewhich $(MJOTEX))
  35 SRCS += $(MJOTEXPATHS)
  36 endif
  37
  38
  39 # The first target is the default, so put the PDF document first.
  40 #
  41 # This voodoo is all designed to find a "fixed point" of calling
  42 # $(LATEX). When you build a LaTeX document, it requires an unknown
  43 # number of compilation passes. How do you know when to stop? Easy,
  44 # stop when the output file stops changing! But how to encode that
  45 # in a makefile?
  46 #
  47 # At the start of this target, we call $(LATEX) to compile $(PN).tex.
  48 # If you ignore the "sed" for now, then the next step is to check for
  49 # the existence of a "previous" file. If there isn't one, this is the
  50 # first time that we've tried to build the PDF. In that case, take the
  51 # PDF that we've just built and make *that* the previous file. Then
  52 # start all over. If there is a previous file, then this is the second
  53 # (or more) time that we've tried to build the PDF. We diff the PDF
  54 # file that we've just built against the previous file; if they're the
  55 # same, then we've succeeded and stop. Otherwise, we make the new PDF
  56 # the previous file, and start all over. The end result is that we
  57 # will loop until the newly-created PDF and the previous file are
  58 # identical.
  59 #
  60 # But what about the "sed" call? By default, pdflatex will compile the
  61 # creation date, modification date, and a unique ID into the output
  62 # PDF. That means that two otherwise-identical documents, created
  63 # seconds apart, will look different. We only need to know when the
  64 # *contents* of the document are the same -- we don't care about the
  65 # metadata -- so sed is used to remove those three nondeterministic
  66 # pieces of information.
  67 #
  68 # The creation and modification dates should become optional in pdftex
  69 # v1.40.17 thanks to Debian's SOURCE_DATE_EPOCH initiative. When that
  70 # version of pdflatex makes it into TeX Live 2016, we can replace
  71 # those two sed scripts with something smarter.
  72 #
  73 $(PN).pdf: $(SRCS) $(PN).bbl
  74         $(LATEX) $(PN).tex
  75
  76         sed --in-place \
  77             -e '/^\/ID \[<.*>\]/d' \
  78             -e "s/^\/\(ModDate\) (.*)/\/\1 (D:19700101000000Z00'00')/" \
  79             -e "s/^\/\(CreationDate\) (.*)/\/\\1 (D:19700101000000Z00'00')/" \
  80             $@
  81
  82         if [ ! -f $@.previous ]; then \
  83                 mv $@ $@.previous; \
  84                 $(MAKE) $@; \
  85         fi;
  86
  87         if cmp -s $@ $@.previous; then \
  88                 rm $@.previous; \
  89         else \
  90                 mv $@ $@.previous; \
  91                 $(MAKE) $@; \
  92         fi;
  93
  94
  95 $(PN).aux: $(SRCS)
  96         $(LATEX) $(PN).tex
  97
  98
  99 # The pipe below indicates an "order-only dependency" on the aux file.
 100 # Without it, every compilation of $(PN).tex would produce a new
 101 # $(PN).aux, and thus $(PN).bbl would be rebuilt. This in turn causes
 102 # $(PN).pdf to appear out-of-date, which leads to a recompilation of
 103 # $(PN).tex... and so on. The order-only dependency means we won't
 104 # rebuild $(PN).bbl if $(PN).aux changes.
 105 #
 106 # As a side effect, we now need to depend on $(SRCS) here, since we
 107 # won't pick it up transitively from $(PN).aux.
 108 #
 109 # If the $BIBS variable is undefined, we presume that there are no
 110 # references and create an empty bbl file. Otherwise, we risk trying
 111 # to run biblatex on an aux file containing no citations. If you do
 112 # define $BIBS but don't cite anything, you'll run into a similar
 113 # problem. Don't do that.
 114 #
 115 $(PN).bbl: $(SRCS) | $(PN).aux
 116 ifdef BIBS
 117         bibtex $(PN).aux
 118 else
 119         echo -n '' > $@
 120 endif
 121
 122 # Run chktex to find silly mistakes. There is some exit code weirdness
 123 # (Savannah bug 45979), so we just look for empty output.
 124 .PHONY: check
 125 check:
 126         @[ -z "$(shell chktex --quiet mjotex.sty)" ]
 127
 128 # Clean up leftover junk.
 129 .PHONY: clean
 130 clean:
 131         rm -f *.{aux,bbl,bcf,bib,blg,listing,lof,log}
 132         rm -f *.{nav,out,pdf,snm,spl,toc,xml}
 133         rm -rf dist/
 134
 135 # If this document will be published, the publisher isn't going to
 136 # have your BibTeX database or your mjotex files. So, you need to
 137 # package them up along with the code for your document. This target
 138 # will create a "dist" directory and copy the necessary stuff there.
 139 #
 140 .PHONY: dist
 141 dist: $(PN).bbl
 142         mkdir -p dist
 143         cp $(SRCS) $(PN).bbl $(BIBPATHS) $(MJOTEXPATHS) dist/