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https://git.lyx.org/repos/lyx.git
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fff79cf645
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@5197 a592a061-630c-0410-9148-cb99ea01b6c8
151 lines
4.3 KiB
Bash
151 lines
4.3 KiB
Bash
#! /bin/sh
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#
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# \file lyxpreview2ppm.sh
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# Copyright 2002 the LyX Team
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# Read the file COPYING
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#
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# \author Angus Leeming, leeming@lyx.org
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# with much help from David Kastrup, david.kastrup@t-online.de.
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#
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# This script takes a LaTeX file and generates PPM files, one per page.
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# The idea is to use it with preview.sty from the preview-latex project
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# (http://preview-latex.sourceforge.net/) to create small bitmap previews of
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# things like math equations.
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# preview.sty can be obtained from CTAN/macros/latex/contrib/supported/preview.
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# This script, lyxpreview2ppm.sh, takes three arguments:
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# FILE: the name of the file to be converted.
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# SCALEFACTOR: scale factor, used to ascertain the resolution of the
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# generated imagewhich is then passed to gs.
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# NDIGITS: the number of digits in the filenames generated by gs,
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# ${BASE}%${NDIGITS}d.ppm
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# If successful it will leave in dir ${DIR} a number of image files
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# ${BASE}[0-9]\{${NDIGITS}\}.ppm and a file ${BASE}.metrics containing info
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# needed by LyX to position the images correctly on the screen.
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# All other files ${BASE}* will be deleted.
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# Three helper functions.
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FIND_IT () {
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which ${EXECUTABLE} > /dev/null
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if [ $? -ne 0 ]; then
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echo "Unable to find \"${EXECUTABLE}\". Please install."
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exit 1
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fi
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}
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BAIL_OUT () {
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# Remove everything except the original .tex file.
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FILES=`ls ${BASE}* | sed -e "/${BASE}.tex/d"`
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rm -f ${FILES} texput.log
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exit 1
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}
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REQUIRED_VERSION () {
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echo "We require preview.sty version 0.73 or newer. You're using"
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grep 'Package: preview' ${LOGFILE}
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}
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# Preliminary check
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if [ $# -ne 3 ]; then
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exit 1
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fi
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# We use latex, dvips and gs, so check that they're all there.
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EXECUTABLE=latex; FIND_IT
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EXECUTABLE=dvips; FIND_IT
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EXECUTABLE=gs; FIND_IT
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# Initialise some variables.
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DIR=`dirname $1`
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BASE=`basename $1 .tex`
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SCALEFACTOR=$2
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NDIGITS=$3
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TEXFILE=${BASE}.tex
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LOGFILE=${BASE}.log
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DVIFILE=${BASE}.dvi
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PSFILE=${BASE}.ps
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METRICSFILE=${BASE}.metrics
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# LaTeX -> DVI.
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cd ${DIR}
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latex ${TEXFILE}
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if [ $? -ne 0 ]; then
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echo "Failed: latex ${TEXFILE}"
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BAIL_OUT
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fi
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# Parse ${LOGFILE} to obtain bounding box info to output to ${METRICSFILE}.
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# This extracts lines starting "Preview: Tightpage" and "Preview: Snippet".
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grep -E 'Preview: [ST]' ${LOGFILE} > ${METRICSFILE}
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if [ $? -ne 0 ]; then
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echo "Failed: grep -E 'Preview: [ST]' ${LOGFILE}"
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REQUIRED_VERSION
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BAIL_OUT
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fi
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# Parse ${LOGFILE} to obtain ${RESOLUTION} for the gs process to follow.
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# 1. Extract font size from a line like "Preview: Fontsize 20.74pt"
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# Use grep for speed and because it gives an error if the line is not found.
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LINE=`grep 'Preview: Fontsize' ${LOGFILE}`
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if [ $? -ne 0 ]; then
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echo "Failed: grep 'Preview: Fontsize' ${LOGFILE}"
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REQUIRED_VERSION
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BAIL_OUT
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fi
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# Use "" quotes in the echo to preserve newlines (technically IFS separators).
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# The sed script strips out everything that won't form a decimal number from the
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# line. It bails out after the first match has been made in case there are
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# multiple lines "Preview: Fontsize". (There shouldn't be.)
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LATEXFONT=`echo "${LINE}" | sed 's/[^0-9\.]//g; 1q'`
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# 2. Extract magnification from a line like "Preview: Magnification 2074"
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# If no such line found, default to MAGNIFICATION=1000.
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LINE=`grep 'Preview: Magnification' ${LOGFILE}`
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if [ $? -ne 0 ]; then
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MAGNIFICATION=1000
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else
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# The sed script strips out everything that won't form an /integer/.
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MAGNIFICATION=`echo "${LINE}" | sed 's/[^0-9]//g; 1q'`
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fi
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# 3. Compute resolution.
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# "bc" allows floating-point arithmetic, unlike "expr" or "dc".
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RESOLUTION=`echo "scale=2; \
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${SCALEFACTOR} * (10/${LATEXFONT}) * (1000/${MAGNIFICATION})" \
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| bc`
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# DVI -> PostScript
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dvips -o ${PSFILE} ${DVIFILE}
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if [ $? -ne 0 ]; then
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echo "Failed: dvips -o ${PSFILE} ${DVIFILE}"
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BAIL_OUT
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fi
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# PostScript -> Bitmap files
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# Older versions of gs have problems with a large degree of anti-aliasing
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# at high resolutions
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ALPHA=4
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if [ ${RESOLUTION} -gt 150 ]; then
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ALPHA=2
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fi
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gs -q -dNOPAUSE -dBATCH -dSAFER \
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-sDEVICE=pnmraw -sOutputFile=${BASE}%0${NDIGITS}d.ppm \
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-dGraphicsAlphaBit=${ALPHA} -dTextAlphaBits=${ALPHA} -r${RESOLUTION} \
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${PSFILE}
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if [ $? -ne 0 ]; then
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echo "Failed: gs ${PSFILE}"
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BAIL_OUT
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fi
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# All has been successful, so remove everything except the bitmap files
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# and the metrics file.
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FILES=`ls ${BASE}* | \
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sed -e "/${BASE}.metrics/d" -e "/${BASE}[0-9]\{${NDIGITS}\}.ppm/d"`
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rm -f ${FILES}
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