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-calculus.tex mjo-common.tex
  21 MJOTEX += mjo-complex.tex mjo-cone.tex mjo-convex.tex mjo-font.tex
  22 MJOTEX += mjo-linear_algebra.tex mjo-listing.tex mjo-misc.tex
  23 MJOTEX += mjo-proof_by_cases.tex mjo-theorem.tex mjo-theorem-star.tex
  24 MJOTEX += mjo-topology.tex mjo.bst
  25
  26 # Use kpsewhich (from the kpathsea suite) to find the absolute paths
  27 # of the bibtex/mjotex files listed in in $(BIBS)/$(MJOTEX). The SRCS
  28 # variable should contain all (Bib)TeX source files for the document.
  29 SRCS = $(PN).tex
  30 ifdef BIBS
  31 BIBPATHS = $(shell kpsewhich $(BIBS))
  32 SRCS += $(BIBPATHS)
  33 endif
  34 ifdef MJOTEX
  35 MJOTEXPATHS = $(shell kpsewhich $(MJOTEX))
  36 SRCS += $(MJOTEXPATHS)
  37 endif
  38
  39
  40 # The first target is the default, so put the PDF document first.
  41 #
  42 # This voodoo is all designed to find a "fixed point" of calling
  43 # $(LATEX). When you build a LaTeX document, it requires an unknown
  44 # number of compilation passes. How do you know when to stop? Easy,
  45 # stop when the output file stops changing! But how to encode that
  46 # in a makefile?
  47 #
  48 # At the start of this target, we call $(LATEX) to compile $(PN).tex.
  49 # If you ignore the "sed" for now, then the next step is to check for
  50 # the existence of a "previous" file. If there isn't one, this is the
  51 # first time that we've tried to build the PDF. In that case, take the
  52 # PDF that we've just built and make *that* the previous file. Then
  53 # start all over. If there is a previous file, then this is the second
  54 # (or more) time that we've tried to build the PDF. We diff the PDF
  55 # file that we've just built against the previous file; if they're the
  56 # same, then we've succeeded and stop. Otherwise, we make the new PDF
  57 # the previous file, and start all over. The end result is that we
  58 # will loop until the newly-created PDF and the previous file are
  59 # identical.
  60 #
  61 # But what about the "sed" call? By default, pdflatex will compile the
  62 # creation date, modification date, and a unique ID into the output
  63 # PDF. That means that two otherwise-identical documents, created
  64 # seconds apart, will look different. We only need to know when the
  65 # *contents* of the document are the same -- we don't care about the
  66 # metadata -- so sed is used to remove those three nondeterministic
  67 # pieces of information.
  68 #
  69 # The creation and modification dates should become optional in pdftex
  70 # v1.40.17 thanks to Debian's SOURCE_DATE_EPOCH initiative. When that
  71 # version of pdflatex makes it into TeX Live 2016, we can replace
  72 # those two sed scripts with something smarter.
  73 #
  74 $(PN).pdf: $(SRCS) $(PN).bbl
  75         $(LATEX) $(PN).tex
  76
  77         sed --in-place \
  78             -e '/^\/ID \[<.*>\]/d' \
  79             -e "s/^\/\(ModDate\) (.*)/\/\1 (D:19700101000000Z00'00')/" \
  80             -e "s/^\/\(CreationDate\) (.*)/\/\\1 (D:19700101000000Z00'00')/" \
  81             $@
  82
  83         if [ ! -f $@.previous ]; then \
  84                 mv $@ $@.previous; \
  85                 $(MAKE) $@; \
  86         fi;
  87
  88         if cmp -s $@ $@.previous; then \
  89                 rm $@.previous; \
  90         else \
  91                 mv $@ $@.previous; \
  92                 $(MAKE) $@; \
  93         fi;
  94
  95
  96 $(PN).aux: $(SRCS)
  97         $(LATEX) $(PN).tex
  98
  99
 100 # The pipe below indicates an "order-only dependency" on the aux file.
 101 # Without it, every compilation of $(PN).tex would produce a new
 102 # $(PN).aux, and thus $(PN).bbl would be rebuilt. This in turn causes
 103 # $(PN).pdf to appear out-of-date, which leads to a recompilation of
 104 # $(PN).tex... and so on. The order-only dependency means we won't
 105 # rebuild $(PN).bbl if $(PN).aux changes.
 106 #
 107 # As a side effect, we now need to depend on $(SRCS) here, since we
 108 # won't pick it up transitively from $(PN).aux.
 109 #
 110 # If the $BIBS variable is undefined, we presume that there are no
 111 # references and create an empty bbl file. Otherwise, we risk trying
 112 # to run biblatex on an aux file containing no citations. If you do
 113 # define $BIBS but don't cite anything, you'll run into a similar
 114 # problem. Don't do that.
 115 #
 116 $(PN).bbl: $(SRCS) | $(PN).aux
 117 ifdef BIBS
 118         bibtex $(PN).aux
 119 else
 120         echo -n '' > $@
 121 endif
 122
 123 # If the output PDF exists but the log file does not, then an attempt
 124 # to "build the log file" (i.e. build the PDF) would do nothing. Thus
 125 # whenever the log file does not exist, we do a fresh build.
 126 $(PN).log: $(SRCS)
 127         $(MAKE) clean
 128         $(MAKE)
 129
 130 # Ensure that there are no overfull or underfull boxes in the output
 131 # document by parsing the log for said warnings.
 132 .PHONY: check-boxes
 133 check-boxes: $(PN).log
 134         @! grep -i 'overfull\|underfull' $<
 135
 136 # Run chktex to find silly mistakes. There is some exit code weirdness
 137 # (Savannah bug 45979), so we just look for empty output.
 138 .PHONY: check-chktex
 139 CHKTEX = chktex --localrc .chktexrc --quiet --inputfiles=0
 140 check-chktex:
 141         @[ -z "$(shell $(CHKTEX) mjotex.sty)" ]
 142
 143 # Ensure that there are no undefined references in the document by
 144 # parsing the log file for said warnings.
 145 .PHONY: check-undefined
 146 check-undefined: $(PN).log
 147         @! grep -i 'undefined' $<
 148
 149 # Run a suite of checks.
 150 .PHONY: check
 151 check: check-boxes check-chktex check-undefined
 152
 153 # Clean up leftover junk. This only looks overcomplicated because
 154 # the *.{foo,bar} syntax supported by Bash is not POSIX, and Make
 155 # will execute these commands using /bin/sh (which should be POSIX).
 156 JUNK_EXTENSIONS  = aux bbl bcf bib blg listing lof log nav out pdf
 157 JUNK_EXTENSIONS += snm spl toc xml
 158 .PHONY: clean
 159 clean:
 160         for ext in $(JUNK_EXTENSIONS); do rm -f *.$$ext; done;
 161         rm -rf dist/
 162
 163 # If this document will be published, the publisher isn't going to
 164 # have your BibTeX database or your mjotex files. So, you need to
 165 # package them up along with the code for your document. This target
 166 # will create a "dist" directory and copy the necessary stuff there.
 167 #
 168 .PHONY: dist
 169 dist: $(PN).bbl
 170         mkdir -p dist
 171         cp $(SRCS) $(PN).bbl $(BIBPATHS) $(MJOTEXPATHS) dist/