#!/bin/sh
#
# $Id: latex-mk.in,v 1.40 2010/12/28 07:28:50 dan Exp $
#
# Copyright (c) 2002, 2003, 2004, 2005, 2006, 2010 Dan McMahill
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#        This product includes software developed by Dan McMahill
#  4. The name of the author may not be used to endorse or promote products
#     derived from this software without specific prior written permission.
# 
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
#  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
#  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
#  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
#  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
#  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
#  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
#  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
#  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
#  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
#  SUCH DAMAGE.
#

VERSION=@VERSION@

MAXITERS=${MAXITERS:-5}

BIBTEX=${BIBTEX:-bibtex}
BIBTEX_FLAGS=${BIBTEX_FLAGS:-}
LATEX=${LATEX:-latex}
LATEX_FLAGS=${LATEX_FLAGS:-}
MAKEIDX=${MAKEIDX:-makeindex}
MAKEIDX_FLAGS=${MAKEIDX_FLAGS:-}
MAKEGLS=${MAKEGLS:-makeindex}
MAKEGLS_FLAGS=${MAKEGLS_FLAGS:-}
PDFLATEX=${PDFLATEX:-pdflatex}
PDFLATEX_FLAGS=${PDFLATEX_FLAGS:-}
TEX2PAGE=${TEX2PAGE:-tex2page}
TEX2PAGE_FLAGS=${TEX2PAGE_FLAGS:-}

LATEX_MK_LOG=${LOG:-latex-mk.log}

# The environment variable TEXMFOUTPUT is a "special" one.  LaTeX will
# try to write its output files (including intermediate files) to the
# current directory.  If the current directory is not writeable, then
# it will try to use the directory specified by TEXMFOUTPUT.  This
# is rather important for this script as we monitor certain intermediate
# files produced by latex and we also need to know where to point programs
# like BibTeX.  Because of this, we will test right away if we can write
# to the current directory.

here=${PWD}
t=latex-mk.test.$$$$
if touch ${t} 2>/dev/null ; then
	rm -f ${t}
	ODIR="."
else
	if test -z "${TEXMFOUTPUT}"; then
		echo "$0:  The current directory: ${here}"
		echo "is not writeable and TEXMFOUTPUT is not set.  LaTeX can not be run."
		exit 1
	else
		t="${TEXMFOUTPUT}/${t}"
		if touch ${t} 2>/dev/null ; then
			rm -f ${t}
			ODIR="${TEXMFOUTPUT}"
			if test -z "${TEXINPUTS}" ; then
				TEXINPUTS="${ODIR}:"
			else
				TEXINPUTS="${ODIR}:${TEXINPUTS}:"
			fi
			export TEXINPUTS
			if test -z "${BIBINPUTS}" ; then
				BIBINPUTS=".:${here}:"
			else
				BIBINPUTS=".:${here}:${BIBINPUTS}:"
			fi
			export BIBINPUTS
		else
			echo "$0:  Neither the current directory: ${here}"
			echo "     nor the directory specified by TEXMFOUTPUT: ${TEXMFOUTPUT}"
			echo "     can be written to.  LaTeX can not be run."
			exit 1
		fi
	fi
fi

echo "${LATEX_MK_LOG}" | grep "^/"
if test $? -ne 0 ; then
	LATEX_MK_LOG="${ODIR}/${LATEX_MK_LOG}"
fi

# list of files to monitor.  If they change, we will rerun 
# LaTeX again.  These are all suffixes of ${NAME}
#
# glo = \glossaryentry commands from \glossary
# gls = glossary file created by (normally) makeindex from the .glo file
# ilg = glossary log file created by (normally) makeindex
# ind = index file created by the makeindex program from the .idx file
# lof = list of figures
# lot = list of tables
# toc = table of contents
monitor_files="glo gls ind lof lot toc"
clean_files="idx ilg ${monitor_files}"

sep="------------------------------------"

#######################################################################
#
# usage()
#

usage() {
cat << EOF

$0

This is a wrapper script used by the LaTeX-Mk
makefile system for LaTeX documents.  Its purpose is to
run LaTeX the appropriate number of times to resolve all
references and page changes associated with resolving
references.  In addition BibTex and makeindex runs are
performed as needed.

Although the primary purpose of this script is to be a support
tool for the LaTeX-Mk system, it may be run standalone.


OPTIONS

  -b, --bibtex      :  Force a run of bibtex even if there were no
		       missing citations.

  --clean           :  Clean up various state files and log files used
		       by $0.

  --debug           :  Enable verbose debugging output.

  -h, --help        :  Display this help message.

  --ignore-errors   :  Ignores any error codes from the various programs
		       which are run.

  --pdflatex        :  Use PDFLaTeX instead of LaTeX.

  --testlog logfile :  Log the actions taken by this script to the file
		       "logfile".  This is used as part of the regression
		       test suite and is primarily for developer use.
		       The exact format and contents of the log file are
		       subject to change without notification.

  --tex2page        :  Use TeX2Page instead of LaTeX.

  --version         :  Displays the version and exits.

ENVIRONMENT VARIABLES

The following environment variables, with defaults shown in [],
affect the behaviour of $0.

  BIBTEX         [${BIBTEX}]
  BIBTEX_FLAGS   [${BIBTEX_FLAGS}]
  LATEX          [${LATEX}]
  LATEX_FLAGS    [${LATEX_FLAGS}]
  MAKEIDX        [${MAKEIDX}]
  MAKEIDX_FLAGS  [${MAKEIDX_FLAGS}]
  MAKEGLS        [${MAKEGLS}]
  MAKEGLS_FLAGS  [${MAKEGLS_FLAGS}]
  PDFLATEX       [${PDFLATEX}]
  PDFLATEX_FLAGS [${PDFLATEX_FLAGS}]
  TEX2PAGE       [${TEX2PAGE}]
  TEX2PAGE_FLAGS [${TEX2PAGE_FLAGS}]
  TEXMFOUTPUT    [${TEXMFOUTPUT}]
  LATEX_MK_LOG   [${LOG}]

SEE ALSO

  http://latex-mk.sf.net

EOF
}
#
#######################################################################

ignore_errors=no
debug=no
do_clean=no
force_bibtex=no
test_log=""
flags=""

while test -n "$1"
do
	case "$1"
	in

	-b|--bibtex)
		force_bibtex=yes
		flags="${flags} bibtex"
		shift
		;;

	--clean)
		do_clean=yes
		flags="${flags} clean"
		shift
		;;
		
	--debug)
		debug=yes
		echo "$0:  Enabling debug mode"
		shift
		;;
		
	-h|--help)
		usage
		exit 0
		;;

	--ignore-errors)
		ignore_errors=yes
		flags="${flags} ignore_errors"
		shift
		;;

	--pdflatex)
		LATEX=$PDFLATEX
		LATEX_FLAGS=$PDFLATEX_FLAGS
		flags="${flags} pdflatex"
		shift
		;;

	--testlog)
		test_log="$2"
		shift 2
		;;

	--tex2page)
		LATEX=$TEX2PAGE
		LATEX_FLAGS=$TEX2PAGE_FLAGS
		flags="${flags} tex2page"
		shift
		;;

	--version)
		echo "latex-mk version $VERSION"
		exit 0
		;;

	-*)
		echo "unknown option: $1"
		exit 1
		;;

	*)
		break
		;;

	esac
done

#######################################################################
#
# log()
#

first_log=yes
log() {
	# Log a message to the test log file if it has been defined.
	if test -n "$test_log" ; then
		if test "${first_log}" = "yes" ; then
			first_log=no
			rm -f $test_log
		fi
		if test ! -f $test_log ; then
			touch $test_log
			if test $? -ne 0 ; then
				echo "$0:  Could not write to test log $test_log" > /dev/stderr
				exit 1
			fi
		fi
		echo "$*" >> $test_log

	fi
}

#
#
#######################################################################

#######################################################################
#
# check_bibunits()

check_bibunits() {
	msg="Checking if ${NAME} uses the bibunits package..."
	if grep "bibunits.sty" "$LATEX_MK_LOG" >/dev/null ; then
	    rslt="yes"
	    using_bibunits=yes
	    log "bibunits package detected"
	else
	    rslt="yes"
	    using_bibunits=no
	fi
	report "$msg $rslt"
}

#
#######################################################################

#######################################################################
#
# new_or_changed()
#

new_or_changed() {
	f=$1
	r=1
	report "Checking for ${f} ..."
	if [ -f "${f}" ]; then
		if [ ! -f "${f}.old" ]; then
			log "\"${f}\" is new"
			r=0
		elif cmp -s "${f}.old" "${f}" ; then
			log "\"${f}\" is not changed"
		else
			log "\"${f}\" has changed"
			r=0
		fi

		cp -p "${f}" "${f}.old"
	fi

	return ${r}
}

#
#
#######################################################################

#######################################################################
#
# report() -- Like echo but with some decorations added to help
#             the user know what tool is producing the message
#

report() {
cat <<EOF
LaTeX-Mk: $*
EOF
}

#
#
#######################################################################


INFILE=$1

log "latex-mk invoked with flags = $flags" 
log "BIBTEX         [${BIBTEX}]"
log "BIBTEX_FLAGS   [${BIBTEX_FLAGS}]"
log "LATEX          [${LATEX}]"
log "LATEX_FLAGS    [${LATEX_FLAGS}]"
log "MAKEIDX        [${MAKEIDX}]"
log "MAKEIDX_FLAGS  [${MAKEIDX_FLAGS}]"
log "MAKEGLS        [${MAKEGLS}]"
log "MAKEGLS_FLAGS  [${MAKEGLS_FLAGS}]"
log "PDFLATEX       [${PDFLATEX}]"
log "PDFLATEX_FLAGS [${PDFLATEX_FLAGS}]"
log "TEX2PAGE       [${TEX2PAGE}]"
log "TEX2PAGE_FLAGS [${TEX2PAGE_FLAGS}]"
log "LATEX_MK_LOG   [${LATEX_MK_LOG}]"
log "ODIR           [${ODIR}]"
log ""
log "TEXMFOUTPUT    [${TEXMFOUTPUT}]"
log "TEXINPUTS      [${TEXINPUTS}]"
log "BIBINPUTS      [${BIBINPUTS}]"

if test "X$debug" = "Xyes" ; then
	echo "$0 debug: command line INFILE=$INFILE"
fi

if test -z "$INFILE" ; then
	echo "$0:   You must specify an input file"
	exit 1
fi

if test ! -f "${INFILE}" ; then
    INFILE=${INFILE}.tex
fi
if test ! -f "${INFILE}" ; then
	echo "$0:   Neither ${INFILE} nor ${INFILE}.tex exists"
	exit 1
fi
if test "X$debug" = "Xyes" ; then
	echo "$0 debug: processed INFILE=$INFILE"
fi

NAME=`basename "${INFILE}" .tex`

if test "X$debug" = "Xyes" ; then
	echo "$0 debug: NAME=$NAME"
fi

if [ "X$do_clean" = "Xyes" ]; then
	report "Cleaning for project: ${NAME}"
	# clean up any of the .aux, .blg and .bbl files that may have
	# been created by the bibunits package.
	log "Cleaning bibunits.sty leftover files"
	for sfx in aux blg bbl ; do
		for f in "${ODIR}"/bu[0-9]*.${sfx} "${ODIR}/bu.${sfx}" 	; do
			if test -f "${f}" ; then
				report "Removing bibunits package leftover file ${f}"
				rm -f "${f}"
			fi
		done
	done

	if test -f "$LATEX_MK_LOG" ; then
		rm -f "$LATEX_MK_LOG"
	fi
	# clean up any of the .old versions of files we were
	# monitoring
	for sfx in $clean_files ; do
		f="${ODIR}/${NAME}.${sfx}.old"
		log "cleaning ${f}"
		if test -f "${f}" ; then
			rm -f "${f}"
		fi
	done

	exit 0
fi

GLSFILE=nomencl.ist
if test -f "$NAME.ist" ; then
	GLSFILE="$NAME.ist"
	if test "X$debug" = "Xyes" ; then
		echo "$0 debug: Using \"$GLSFILE\" as glossary style file"
	fi
fi


#######################################################################
#
# check_bib()
#

check_bib() {
	# run latex.  If it fails, manually remove the .dvi file since
	# latex won't.  Leaving the .dvi file would confuse 'make' because on the next
	# invocation, the .dvi file would appear to be up to date already.
	log "check_bib() called"
	bibtex_ok=no
	for w in citation bibdata bibstyle ; do
		msg="Checking for \\$w in \"${ODIR}/${NAME}.aux\" ..."
		rslt="no"
		if grep "^\\\\${w}" "${ODIR}/${NAME}.aux" >/dev/null 2>/dev/null ; then
			rslt="yes"
			bibtex_ok=yes
			log "check_bib():  It is ok to run BibTex (found $w)"
		fi
		report "$msg $rslt"
	done
	rc=0
	if test $bibtex_ok = no ; then
		rc=1
	fi
	return $rc
}

#
#######################################################################

#######################################################################
#
# run_latex()
#

run_latex() {
	# run latex.  If it fails, manually remove the .dvi file since
	# latex won't.  Leaving the .dvi file would confuse 'make' because on the next
	# invocation, the .dvi file would appear to be up to date already.
	log "run_latex() called"
	( ( ( "$LATEX" $LATEX_FLAGS "$INFILE" 2>&1 ; echo $? >&4) | tee "$LATEX_MK_LOG" 1>&3) 4>&1 |  (read a; exit $a)) 3>&1
	rc=$?
	if test $rc -ne 0 -a "$ignore_errors" != "yes"  ; then
		echo "$sep" 
		echo "$0:  Error:  LaTeX failed" 
		echo "$sep"
		rm -f "${ODIR}/${NAME}.dvi" "${ODIR}/${NAME}.pdf"
		rm -f "$LATEX_MK_LOG"
		log "run_latex() failed"
		exit $rc
	fi

}

#
#######################################################################

#######################################################################
#
# run_bibtex()
#

run_bibtex() {
	log "run_bibtex $* called"
	do_post=yes
	while test $# -gt 0 ; do
		case $1 in
			--skip-post-hook)
				do_post=no
				shift
				;;
			-*)
				echo "$0:  INTERNAL ERROR:  run_bibtex $*"
				exit 1
				;;
			*)
				break
				;;
		esac
	done
	BIBFILE="${1:-${NAME}}"
	log "cd \"${ODIR}\" && \"$BIBTEX\" $BIBTEX_FLAGS \"${BIBFILE}\""
	echo "${sep}"
	echo "Running BibTeX"
	echo "cd $\"{ODIR}\" && \"$BIBTEX\" $BIBTEX_FLAGS \"${BIBFILE}\""
	cd "${ODIR}" && "$BIBTEX" $BIBTEX_FLAGS "${BIBFILE}"
	rc=$?
	cd ${here}
	if test $rc -ne 0 -a "$ignore_errors" != "yes" ; then
		echo "$sep" 
		echo "$0:  Error:  BibTeX failed" 
		echo "$sep"
		rm -f "${ODIR}/${NAME}.dvi" "${ODIR}/${NAME}.pdf"
		rm -f "$LATEX_MK_LOG"
		log "run_bibtex($*) failed"
		exit $rc
	fi

	# run the post-bibtex hook if its been defined
	if test "$do_post" = "yes" -a "X$POST_BIBTEX_HOOK" != "X" ; then
	    if test -x $POST_BIBTEX_HOOK ; then
		$POST_BIBTEX_HOOK "$BIBFILE"
		rc=$?
		if test $rc -ne 0 ; then
		    echo "$POST_BIBTEX_HOOK "$BIBFILE" failed"
		    rm -f "${ODIR}/${NAME}.dvi" "${ODIR}/${NAME}.pdf"
		    rm -f "$LATEX_MK_LOG"
		    exit $rc
		fi
	    fi
	fi
	echo "${sep}"
}

#######################################################################
#
# run_makeindex()
#

run_makeindex() {
	log "run_makeindex() called"
	log "cd \"${ODIR}\" && \"$MAKEIDX\" $MAKEIDX_FLAGS \"$NAME\""
	echo "${sep}"
	echo "Running makeindex"
	echo "cd \"${ODIR}\" && \"$MAKEIDX\" $MAKEIDX_FLAGS \"$NAME\""
	cd "${ODIR}" && "$MAKEIDX" $MAKEIDX_FLAGS "$NAME"
	rc=$?
	cd ${here}
	if test $rc -ne 0 -a "$ignore_errors" != "yes" ; then
		echo "$sep" 
		echo "$0:  Error:  makeindex failed" 
		echo "$sep"
		rm -f "${ODIR}/${NAME}.dvi" "${ODIR}/${NAME}.pdf"
		rm -f "$LATEX_MK_LOG"
		log "run_makeindex() failed"
		exit $rc
	fi
	echo "${sep}"

}

#######################################################################
#
# run_makeglossary()
#

run_makeglossary() {
	log "run_makeglossary() called"
	log "cd \"${ODIR}\" && \"$MAKEGLS\" $MAKEGLS_FLAGS -s \"$GLSFILE\" \"$NAME.glo\" -o \"$NAME.gls\""
	echo "${sep}"
	echo "Running `basename $MAKEGLS`"
	echo "cd \"${ODIR}\" && \"$MAKEGLS\" $MAKEGLS_FLAGS -s \"$GLSFILE\" -o \"$NAME.gls\" \"$NAME.glo\""
	cd "${ODIR}" && "$MAKEGLS" $MAKEGLS_FLAGS -s "$GLSFILE" -o "$NAME.gls" "$NAME.glo"
	rc=$?
	cd ${here}
	if test $rc -ne 0 -a "$ignore_errors" != "yes" ; then
		echo "$sep" 
		echo "$0:  Error:  `basename $MAKEGLS` failed" 
		echo "$sep"
		rm -f "${ODIR}/${NAME}.dvi" "${ODIR}/${NAME}.pdf"
		rm -f "$LATEX_MK_LOG"
		log "run_makeglossary() failed"
		exit $rc
	fi
	echo "${sep}"

}

#
#######################################################################

if [ "X$force_bibtex" = "Xyes" ] ; then
	log "Running with force_bibtex"
	run_latex
	run_bibtex
fi


cnt=0
bibcnt=0
while test $cnt -lt $MAXITERS ; do
	log "${sep}"
	log "Pass #${cnt}"
	run_latex

	# if the document uses the bibunits package, then we will end up
	# with a bunch of .bib files and a bunch of .aux files and we will
	# need to run bibtex
	check_bibunits

	# if we need to run bibtex, we should end up with something like this:
	#LaTeX Warning: Citation `foo' on page 1 undefined on input line 2
	# and
	#LaTeX Warning: There were undefined references.
	#
	# After bibtex is run, we will get one more latex run that has a citation
	# complaint so we allow one more complaint from latex before declaring
	# that there is a problem with the citations.  Just in case someone
	# wants to keep running latex and viewing/printing the results with these
	# errors present, provide a way to override this.
	#
	# Evidently, we may also simply get the following complaint:
	#
	# No file foo.bbl
	#
	# instead of the previous warning.  This can happen if you only have
	# something like \nocite{*} in your document instead of \cite{x}
	# 
	if test "$using_bibunits" = "yes" -a $cnt -eq 0 ; then
		for f in "${ODIR}"/*.aux ; do
			case $f in
				# FIXME -- the user can potentially change
				# the file names used here.  Is there a more robust
				# way?
				${ODIR}/bu[0-9]*.aux)
					fb=`basename $f .aux`
					log "Running bibtex on $f"
					run_bibtex --skip-post-hook "${fb}"
					;;
			esac
		done
	fi

	needbib=`grep "Citation.*undefined" "$LATEX_MK_LOG"`
	if test -n "$needbib" ; then log "Citation undefined" ; fi
	if test -z "$needbib" ; then
	    report "Checking for missing .bbl files in latex log ..."
	    needbib=`grep "No file.*\.bbl" "$LATEX_MK_LOG"`
	    if test -n "$needbib" ; then log "Missing .bbl" ; fi
	fi
	if test -n "$needbib" ; then
		if test $bibcnt -eq 0 ; then
			# This is a bit of a dodgy thing here.  If we are using
			# the bibunits package, we will probably end up here
			# but we actually don't need to run bibtex on the main
			# document.  There is also the possiblilty that we still
			# need to run bibtex.  It all depends on if we have a
			# non-bibunits bibliography too or not
			if check_bib ; then
				echo "$sep"
				echo "$0:  Running bibtex to resolve citations"
				echo "$sep"
				log "BibTex run #1"
				run_bibtex
			else
				log "Skip BibTex run #1 (due to check_bib)"
			fi
		elif test $bibcnt -eq 1 ; then
			echo "$sep"
			echo "$0:  BibTeX has already been run, but LaTeX is still reporting"
			echo "    $needbib."
			echo "    Trying LaTeX one more time...."
			echo "$sep"
			log "Try another latex run for the citations"
		elif test -n "$IGNORE_CITATION_WARNS" ; then
			echo "$sep"
			echo "$0:  WARNING:  BibTeX has already been run, but LaTeX is still reporting"
			echo "$0:  $needbib"
			echo "$0:  You have set the IGNORE_CITATION_WARNS variable to override this, but"
			echo "$0:  you probably do have an error in your citations."
			echo "$sep"
			log "Could not resolve citations but you are ignoring this"
		else
			echo "$sep"
			echo "$0:  Error:  BibTeX has already been run, but LaTeX is still reporting"
			echo "$0:  $needbib"
			echo "$sep"
			rm -f "$LATEX_MK_LOG"
			log "Exit with undefined citations"
			if test "$ignore_errors" = "yes" ; then exit 0 ; else exit 1 ; fi
		fi
		bibcnt=`expr $bibcnt + 1`
	fi

	# Check if we need to run makeindex.  What will happen is the first LaTeX run
	# generates a .idx file.  Then we run makeindex to operate on the .idx file
	# and generate a .ind file.  Since we monitor the .ind file all we must do here
	# is see if a makeindex run is needed.
	if new_or_changed "${ODIR}/${NAME}.idx" ; then
		log "\"${ODIR}/${NAME}.idx\" new or changed -> need to run makeindex"
		run_makeindex
	fi

	# we shouldn't need this, but lets be sure
	if test -f "${ODIR}/${NAME}.idx" -a ! -f "${ODIR}/${NAME}.ind" ; then
		log "\"${ODIR}/${NAME}.idx\" exists but not \"${ODIR}/${NAME}.ind\" -> run makeindex"
		run_makeindex
	fi

	if test -f "${ODIR}/${NAME}.glo" && new_or_changed "${ODIR}/${NAME}.glo" ; then
		log "\"${ODIR}/${NAME}.glo\" new or changed -> need to update glossary"
		run_makeglossary
	fi

	# Examine the list of figures, list of tables, table of contents, etc
	# files because when these change, we need to re-run latex, but
	# sometimes latex does not tell us this.
	changed_file=""
	for sfx in $monitor_files ; do
		if new_or_changed "${ODIR}/${NAME}.${sfx}" ; then
			changed_file="${changed_file} \"${ODIR}/${NAME}.${sfx}\""
			echo "\"${ODIR}/${NAME}.${sfx}\" is new or changed.  LaTeX needs to be re-run"
		fi
	done

	# with latex, you might see:
	#LaTeX Warning: Label(s) may have changed. Rerun to get cross-references right
	# 
	# with tex2page, you may get:
	#Rerun: tex2page week5.tex
	#
	rerun=`grep "Rerun" "$LATEX_MK_LOG"`
	log "rerun        = ${rerun}"
	log "needbib      = ${needbib}"
	log "changed_file = ${changed_file}"
	if test -z "$rerun" -a -z "$needbib" -a -z "$changed_file" ; then
		log "No rerun is needed"
		break;
	fi
	log "Rerun is needed"
	echo "$sep"
	echo "$0:   LaTeX references have changed, another latex run is needed"
	echo "$sep"
	cnt=`expr $cnt + 1`
	if test "X$debug" = "Xyes" ; then echo "$0 debug: incremented cnt=$cnt" ; fi
done

#LaTeX Warning: There were undefined references.
undefined=`grep "There were undefined references" "$LATEX_MK_LOG"`
if test -n "$undefined" ; then
	log "Finished but still have undefined references."
	echo "$sep"
	echo "$0:  There were undefined references.  Please correct this."
	echo "$0:  I have already made $cnt passes."
	#LaTeX Warning: Reference `tab:fuse_table' on page 3 undefined on input line 82.
	grep "Reference.*on page.*undefined" "$LATEX_MK_LOG"
	echo "$sep"
fi

#LaTeX Warning: There were multiply-defined labels.
mult=`grep "multiply-defined labels" "$LATEX_MK_LOG"`
if test -n "$mult" ; then
	log "Finished but still have multiply defined labels."
	echo "$sep"
	echo "$0:  There were multiply defined labels."
	echo "$0:  You may wish to correct this"
	#LaTeX Warning: Label `fig:myfig' multiply defined.
	grep "multiply defined" "$LATEX_MK_LOG"
	echo "$sep"
fi

if test $cnt -eq $MAXITERS ; then
	log "Reached iteration limit."
	echo "$sep"
	echo "$0:   Failed to get LaTeX to converge after $MAXITERS tries"
	echo "$0:   Please fix the document or try again if you think it"
	echo "$0:   should be ok"
	echo "$sep"
	rm -f "$LATEX_MK_LOG"
	if test "$ignore_errors" = "yes" ; then exit 0 ; else exit 1 ; fi
fi

log "Remove log and exit."
rm -f "$LATEX_MK_LOG"
exit 0