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The Instant Preview script in python.
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/branches/BRANCH_1_3_X@8810 a592a061-630c-0410-9148-cb99ea01b6c8
This commit is contained in:
Angus Leeming
parent
cd8d7e5090
commit
bc3f8c8225
@ -1,9 +1,22 @@
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2004-06-09 Angus Leeming <leeming@lyx.org>
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* scripts/lyxpreview2bitmap.sh: removed.
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* scripts/lyxpreview2ppm.py: added. lyxpreview2ppm.py is meant to
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be a straight swap for lyxpreview2bitmap.sh, the idea being that
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the python script has some hope of working on Win32 machines.
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* configure.m4: adjust lyxpreview_to_bitmap_command.
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2004-05-05 Angus Leeming <leeming@lyx.org>
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* scripts/lyxpreview2bitmap.sh: enable the script to work on
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2004-05-19 Uwe Stöhr <uwestoehr@web.de>
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* lib/math.bind: fix some bindings to work with german keyboard;
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new binding "M-m y" that inserts \oint
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2003-05-05 Angus Leeming <leeming@lyx.org>
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2004-05-05 Angus Leeming <leeming@lyx.org>
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* scripts/lyxpreview2bitmap.sh: enable the script to work on
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solaris machines by changing 'grep -E' to 'grep'.
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@ -281,7 +281,7 @@ SEARCH_PROG([for a DVI to PDF converter],dvi_to_pdf_command,dvipdfm)
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test $dvi_to_pdf_command = "dvipdfm" && dvi_to_pdf_command="dvipdfm \$\$i"
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# We have a script to convert previewlyx to ppm
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lyxpreview_to_bitmap_command="lyxpreview2bitmap.sh"
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lyxpreview_to_bitmap_command="lyxpreview2ppm.py"
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# Search a *roff program (used to translate tables in ASCII export)
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LYXRC_PROG([for a *roff formatter], \ascii_roff_command, dnl
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@ -1,235 +0,0 @@
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#! /bin/sh
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# file lyxpreview2bitmap.sh
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# This file is part of LyX, the document processor.
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# Licence details can be found in the file COPYING.
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#
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# author Angus Leeming
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# with much advice from David Kastrup, david.kastrup@t-online.de.
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#
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# Full author contact details are available in file CREDITS
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# This script takes a LaTeX file and generates bitmap image files,
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# 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
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# previews of things like math equations.
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# preview.sty can be obtained from
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# CTAN/macros/latex/contrib/supported/preview.
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# This script takes three arguments:
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# TEXFILE: the name of the .tex file to be converted.
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# SCALEFACTOR: a scale factor, used to ascertain the resolution of the
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# generated image which is then passed to gs.
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# OUTPUTFORMAT: the format of the output bitmap image files.
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# Two formats are recognised: "ppm" and "png".
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# If successful, this script will leave in dir ${DIR}:
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# a (possibly large) number of image files with names like
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# ${BASE}\([0-9]*\).${SUFFIX} where SUFFIX is ppm or png.
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# a file containing info needed by LyX to position the images correctly
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# on the screen.
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# ${BASE}.metrics
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# All other files ${BASE}* will be deleted.
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# A quick note on the choice of OUTPUTFORMAT:
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# In general files in PPM format are 10-100 times larger than the
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# equivalent files in PNG format. Larger files results in longer
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# reading and writing times as well as greater disk usage.
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# However, whilst the Qt image loader can load files in PNG format
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# without difficulty, the xforms image loader cannot. They must first
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# be converted to a loadable format (eg PPM!). Thus, previews will take
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# longer to appear if the xforms loader is used to load snippets in
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# PNG format.
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# You can always experiment by adding a line to your
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# ${LYXUSERDIR}/preferences file
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# \converter lyxpreview ${FORMAT} "lyxpreview2bitmap.sh" ""
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# where ${FORMAT} is either ppm or png.
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# These four programs are used by the script.
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# Adjust their names to suit your setup.
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LATEX=latex
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DVIPS=dvips
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GS=gs
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PNMCROP=pnmcrop
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readonly LATEX DVIPS GS PNMCROP
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# Three helper functions.
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FIND_IT ()
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{
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test $# -eq 1 || exit 1
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type $1 > /dev/null || {
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echo "Unable to find \"$1\". Please install."
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exit 1
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}
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}
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BAIL_OUT ()
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{
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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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echo "Leaving ${BASE}.tex in ${DIR}"
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exit 1
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}
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REQUIRED_VERSION ()
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{
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test $# -eq 1 || exit 1
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echo "We require preview.sty version 0.73 or newer. You're using"
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grep 'Package: preview' $1
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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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# Extract the params from the argument list.
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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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if [ "$3" = "ppm" ]; then
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GSDEVICE=pnmraw
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GSSUFFIX=ppm
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elif [ "$3" = "png" ]; then
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GSDEVICE=png16m
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GSSUFFIX=png
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else
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echo "Unrecognised output format ${OUTPUTFORMAT}."
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echo "Expected either \"ppm\" or \"png\"."
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BAIL_OUT
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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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FIND_IT ${LATEX}
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FIND_IT ${DVIPS}
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FIND_IT ${GS}
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# Initialise some variables.
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TEXFILE=${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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readonly TEXFILE LOGFILE DVIFILE PSFILE METRICSFILE
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# LaTeX -> DVI.
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cd ${DIR}
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${LATEX} ${TEXFILE} ||
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{
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echo "Failed: ${LATEX} ${TEXFILE}"
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BAIL_OUT
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}
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# Parse ${LOGFILE} to obtain bounding box info to output to
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# ${METRICSFILE}.
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# This extracts lines starting "Preview: Tightpage" and
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# "Preview: Snippet".
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grep 'Preview: [ST]' ${LOGFILE} > ${METRICSFILE} ||
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{
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echo "Failed: grep 'Preview: [ST]' ${LOGFILE}"
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REQUIRED_VERSION ${LOGFILE}
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BAIL_OUT
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}
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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
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# not found.
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LINE=`grep 'Preview: Fontsize' ${LOGFILE}` ||
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{
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echo "Failed: grep 'Preview: Fontsize' ${LOGFILE}"
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REQUIRED_VERSION ${LOGFILE}
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BAIL_OUT
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}
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# The sed script strips out everything that won't form a decimal number
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# from the line. It bails out after the first match has been made in
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# case there are multiple lines "Preview: Fontsize". (There shouldn't
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# be.)
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# Note: use "" quotes in the echo to preserve newlines.
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LATEXFONT=`echo "${LINE}" | sed 's/[^0-9\.]//g; 1q'`
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# 2. Extract magnification from a line like
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# "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 LINE=`grep 'Preview: Magnification' ${LOGFILE}`; then
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# Strip out everything that won't form an /integer/.
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MAGNIFICATION=`echo "${LINE}" | sed 's/[^0-9]//g; 1q'`
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else
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MAGNIFICATION=1000
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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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{
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echo "Failed: ${DVIPS} -o ${PSFILE} ${DVIFILE}"
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BAIL_OUT
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}
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# PostScript -> Bitmap files
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# Older versions of gs have problems with a large degree of
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# anti-aliasing at high resolutions
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# test expects integer arguments.
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# ${RESOLUTION} may be a float. Truncate it.
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INT_RESOLUTION=`echo "${RESOLUTION} / 1" | bc`
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ALPHA=4
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if [ ${INT_RESOLUTION} -gt 150 ]; then
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ALPHA=2
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fi
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${GS} -q -dNOPAUSE -dBATCH -dSAFER \
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-sDEVICE=${GSDEVICE} -sOutputFile=${BASE}%d.${GSSUFFIX} \
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-dGraphicsAlphaBit=${ALPHA} -dTextAlphaBits=${ALPHA} \
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-r${RESOLUTION} ${PSFILE} ||
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{
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echo "Failed: ${GS} ${PSFILE}"
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BAIL_OUT
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}
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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 ${BASE}* | sed -e "/${BASE}.metrics/d" \
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-e "/${BASE}\([0-9]*\).${GSSUFFIX}/d"`
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rm -f ${FILES} texput.log
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# The bitmap files can have large amounts of whitespace to the left and
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# right. This can be cropped if so desired.
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CROP=1
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type ${PNMCROP} > /dev/null || CROP=0
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# There's no point cropping the image if using PNG images. If you want to
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# crop, use PPM.
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# Apparently dvipng will support cropping at some stage in the future...
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if [ ${CROP} -eq 1 -a "${GSDEVICE}" = "pnmraw" ]; then
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for FILE in ${BASE}*.${GSSUFFIX}
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do
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if ${PNMCROP} -left ${FILE} 2> /dev/null |\
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${PNMCROP} -right 2> /dev/null > ${BASE}.tmp; then
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mv ${BASE}.tmp ${FILE}
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else
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rm -f ${BASE}.tmp
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fi
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done
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rm -f ${BASE}.tmp
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fi
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echo "Previews generated!"
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380
lib/scripts/lyxpreview2ppm.py
Executable file
380
lib/scripts/lyxpreview2ppm.py
Executable file
@ -0,0 +1,380 @@
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#! /usr/bin/env python
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# -*- coding: iso-8859-1 -*-
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# file lyxpreview2ppm.py
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# This file is part of LyX, the document processor.
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# Licence details can be found in the file COPYING.
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# author Angus Leeming
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# Full author contact details are available in file CREDITS
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# with much advice from members of the preview-latex project:
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# David Kastrup, dak@gnu.org and
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# Jan-Åke Larsson, jalar@mai.liu.se.
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# and with much help testing the code under Windows from
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# Paul A. Rubin, rubin@msu.edu.
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# This script takes a LaTeX file and generates a collection of
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# ppm image files, one per previewed snippet.
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# Pre-requisites:
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# * A latex executable;
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# * preview.sty;
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# * dvips;
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# * gs;
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# * pnmcrop (optional).
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# preview.sty is part of the preview-latex project
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# http://preview-latex.sourceforge.net/
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# preview.sty can alternatively be obtained from
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# CTAN/support/preview-latex/
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# Example usage:
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# lyxpreview2bitmap.py 0lyxpreview.tex 128 ppm
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# This script takes three arguments:
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# TEXFILE: the name of the .tex file to be converted.
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# SCALEFACTOR: a scale factor, used to ascertain the resolution of the
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# generated image which is then passed to gs.
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# OUTPUTFORMAT: the format of the output bitmap image files.
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# This particular script can produce only "ppm" format output.
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# Decomposing TEXFILE's name as DIR/BASE.tex, this script will,
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# if executed successfully, leave in DIR:
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# * a (possibly large) number of image files with names
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# like BASE[0-9]+.ppm
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# * a file BASE.metrics, containing info needed by LyX to position
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# the images correctly on the screen.
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import glob, os, re, string, sys
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import pipes, tempfile
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use_win32_modules = 0
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if os.name == "nt":
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use_win32_modules = 1
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try:
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import pywintypes
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import win32con
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import win32event
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import win32file
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import win32pipe
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import win32process
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import win32security
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import winerror
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except:
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sys.stderr.write("Consider installing the PyWin extension modules "\
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"if you're irritated by the gs window being shown\n")
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use_win32_modules = 0
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# Pre-compiled regular expressions.
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latex_file_re = re.compile("\.tex$")
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def usage(prog_name):
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return "Usage: %s <latex file> <dpi> ppm\n"\
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% prog_name
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def error(message):
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sys.stderr.write(message + '\n')
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sys.exit(1)
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def find_exe(candidates, path):
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for prog in candidates:
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for directory in path:
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if os.name == "nt":
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full_path = os.path.join(directory, prog + ".exe")
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else:
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full_path = os.path.join(directory, prog)
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if os.access(full_path, os.X_OK):
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return full_path
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return None
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def find_exe_or_terminate(candidates, path):
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exe = find_exe(candidates, path)
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if exe == None:
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error("Unable to find executable from '%s'" % string.join(candidates))
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return exe
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def run_command_popen(cmd):
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handle = os.popen(cmd, 'r')
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cmd_stdout = handle.read()
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cmd_status = handle.close()
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return cmd_status, cmd_stdout
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def run_command_win32(cmd):
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sa = win32security.SECURITY_ATTRIBUTES()
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sa.bInheritHandle = True
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stdout_r, stdout_w = win32pipe.CreatePipe(sa, 0)
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si = win32process.STARTUPINFO()
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si.dwFlags = (win32process.STARTF_USESTDHANDLES
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| win32process.STARTF_USESHOWWINDOW)
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si.wShowWindow = win32con.SW_HIDE
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si.hStdOutput = stdout_w
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process, thread, pid, tid = \
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win32process.CreateProcess(None, cmd, None, None, True,
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0, None, None, si)
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if process == None:
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return -1, ""
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# Must close the write handle in this process, or ReadFile will hang.
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stdout_w.Close()
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# Read the pipe until we get an error (including ERROR_BROKEN_PIPE,
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# which is okay because it happens when child process ends).
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data = ""
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error = 0
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while 1:
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try:
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hr, buffer = win32file.ReadFile(stdout_r, 4096)
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if hr != winerror.ERROR_IO_PENDING:
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data = data + buffer
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except pywintypes.error, e:
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if e.args[0] != winerror.ERROR_BROKEN_PIPE:
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error = 1
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break
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if error:
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return -2, ""
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# Everything okay - called process has closed the pipe.
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# For safety, check that the process ended, then pick up its exit code.
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win32event.WaitForSingleObject(process, win32event.INFINITE)
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if win32process.GetExitCodeProcess(process):
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return -3, ""
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return None, data
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def run_command(cmd):
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if use_win32_modules:
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return run_command_win32(cmd)
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else:
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return run_command_popen(cmd)
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def extract_metrics_info(log_file, metrics_file):
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metrics = open(metrics_file, 'w')
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log_re = re.compile("Preview: [ST]")
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success = 0
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for line in open(log_file, 'r').readlines():
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match = log_re.match(line)
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if match != None:
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success = 1
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metrics.write("%s\n" % line)
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return success
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def extract_resolution(log_file, dpi):
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fontsize_re = re.compile("Preview: Fontsize")
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magnification_re = re.compile("Preview: Magnification")
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extract_decimal_re = re.compile("([0-9\.]+)")
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extract_integer_re = re.compile("([0-9]+)")
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found_fontsize = 0
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found_magnification = 0
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# Default values
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magnification = 1000.0
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fontsize = 0.0
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for line in open(log_file, 'r').readlines():
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if found_fontsize and found_magnification:
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break
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if not found_fontsize:
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match = fontsize_re.match(line)
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if match != None:
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match = extract_decimal_re.search(line)
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if match == None:
|
||||
error("Unable to parse: %s" % line)
|
||||
fontsize = string.atof(match.group(1))
|
||||
found_fontsize = 1
|
||||
continue
|
||||
|
||||
if not found_magnification:
|
||||
match = magnification_re.match(line)
|
||||
if match != None:
|
||||
match = extract_integer_re.search(line)
|
||||
if match == None:
|
||||
error("Unable to parse: %s" % line)
|
||||
magnification = string.atof(match.group(1))
|
||||
found_magnification = 1
|
||||
continue
|
||||
|
||||
return dpi * (10.0 / fontsize) * (1000.0 / magnification)
|
||||
|
||||
|
||||
def get_version_info():
|
||||
version_re = re.compile("([0-9])\.([0-9])")
|
||||
|
||||
match = version_re.match(sys.version)
|
||||
if match == None:
|
||||
error("Unable to extract version info from 'sys.version'")
|
||||
|
||||
return string.atoi(match.group(1)), string.atoi(match.group(2))
|
||||
|
||||
|
||||
def copyfileobj(fsrc, fdst, rewind=0, length=16*1024):
|
||||
"""copy data from file-like object fsrc to file-like object fdst"""
|
||||
if rewind:
|
||||
fsrc.flush()
|
||||
fsrc.seek(0)
|
||||
|
||||
while 1:
|
||||
buf = fsrc.read(length)
|
||||
if not buf:
|
||||
break
|
||||
fdst.write(buf)
|
||||
|
||||
|
||||
class TempFile:
|
||||
"""clone of tempfile.TemporaryFile to use with python < 2.0."""
|
||||
# Cache the unlinker so we don't get spurious errors at shutdown
|
||||
# when the module-level "os" is None'd out. Note that this must
|
||||
# be referenced as self.unlink, because the name TempFile
|
||||
# may also get None'd out before __del__ is called.
|
||||
unlink = os.unlink
|
||||
|
||||
def __init__(self):
|
||||
self.filename = tempfile.mktemp()
|
||||
self.file = open(self.filename,"w+b")
|
||||
self.close_called = 0
|
||||
|
||||
def close(self):
|
||||
if not self.close_called:
|
||||
self.close_called = 1
|
||||
self.file.close()
|
||||
self.unlink(self.filename)
|
||||
|
||||
def __del__(self):
|
||||
self.close()
|
||||
|
||||
def read(self, size = -1):
|
||||
return self.file.read(size)
|
||||
|
||||
def write(self, line):
|
||||
return self.file.write(line)
|
||||
|
||||
def seek(self, offset):
|
||||
return self.file.seek(offset)
|
||||
|
||||
def flush(self):
|
||||
return self.file.flush()
|
||||
|
||||
|
||||
def mkstemp():
|
||||
"""create a secure temporary file and return its object-like file"""
|
||||
major, minor = get_version_info()
|
||||
|
||||
if major >= 2 and minor >= 0:
|
||||
return tempfile.TemporaryFile()
|
||||
else:
|
||||
return TempFile()
|
||||
|
||||
|
||||
def crop_files(pnmcrop, basename):
|
||||
t = pipes.Template()
|
||||
t.append("%s -left" % pnmcrop, '--')
|
||||
t.append("%s -right" % pnmcrop, '--')
|
||||
|
||||
for file in glob.glob("%s*.ppm" % basename):
|
||||
tmp = mkstemp()
|
||||
new = t.open(file, "r")
|
||||
copyfileobj(new, tmp)
|
||||
if not new.close():
|
||||
copyfileobj(tmp, open(file,"wb"), 1)
|
||||
|
||||
|
||||
def main(argv):
|
||||
# Parse and manipulate the command line arguments.
|
||||
if len(argv) != 4:
|
||||
error(usage(argv[0]))
|
||||
|
||||
dir, latex_file = os.path.split(argv[1])
|
||||
if len(dir) != 0:
|
||||
os.chdir(dir)
|
||||
|
||||
dpi = string.atoi(argv[2])
|
||||
output_format = argv[3]
|
||||
if output_format != "ppm":
|
||||
error("This script can generate ppm format images only.")
|
||||
|
||||
# External programs used by the script.
|
||||
path = string.split(os.getenv("PATH"), os.pathsep)
|
||||
latex = find_exe_or_terminate(["pplatex", "latex2e", "latex"], path)
|
||||
dvips = find_exe_or_terminate(["dvips"], path)
|
||||
gs = find_exe_or_terminate(["gswin32", "gs"], path)
|
||||
pnmcrop = find_exe(["pnmcrop"], path)
|
||||
|
||||
# Compile the latex file.
|
||||
latex_call = "%s %s" % (latex, latex_file)
|
||||
|
||||
latex_status, latex_stdout = run_command(latex_call)
|
||||
if latex_status != None:
|
||||
error("%s failed to compile %s" \
|
||||
% (os.path.basename(latex), latex_file))
|
||||
|
||||
# Run the dvi file through dvips.
|
||||
dvi_file = latex_file_re.sub(".dvi", latex_file)
|
||||
ps_file = latex_file_re.sub(".ps", latex_file)
|
||||
|
||||
dvips_call = "%s -o %s %s" % (dvips, ps_file, dvi_file)
|
||||
|
||||
dvips_status, dvips_stdout = run_command(dvips_call)
|
||||
if dvips_status != None:
|
||||
error("Failed: %s %s" % (os.path.basename(dvips), dvi_file))
|
||||
|
||||
# Extract resolution data for gs from the log file.
|
||||
log_file = latex_file_re.sub(".log", latex_file)
|
||||
resolution = extract_resolution(log_file, dpi)
|
||||
|
||||
# Older versions of gs have problems with a large degree of
|
||||
# anti-aliasing at high resolutions
|
||||
alpha = 4
|
||||
if resolution > 150:
|
||||
alpha = 2
|
||||
|
||||
# Generate the bitmap images
|
||||
gs_call = "%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pnmraw " \
|
||||
"-sOutputFile=%s%%d.ppm " \
|
||||
"-dGraphicsAlphaBit=%d -dTextAlphaBits=%d " \
|
||||
"-r%f %s" \
|
||||
% (gs, latex_file_re.sub("", latex_file), \
|
||||
alpha, alpha, resolution, ps_file)
|
||||
|
||||
gs_status, gs_stdout = run_command(gs_call)
|
||||
if gs_status != None:
|
||||
error("Failed: %s %s" % (os.path.basename(gs), ps_file))
|
||||
|
||||
# Crop the images
|
||||
if pnmcrop != None:
|
||||
crop_files(pnmcrop, latex_file_re.sub("", latex_file))
|
||||
|
||||
# Extract metrics info from the log file.
|
||||
metrics_file = latex_file_re.sub(".metrics", latex_file)
|
||||
if not extract_metrics_info(log_file, metrics_file):
|
||||
error("Failed to extract metrics info from %s" % log_file)
|
||||
|
||||
return 0
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
main(sys.argv)
|
||||
@ -1,3 +1,8 @@
|
||||
2004-06-09 Angus Leeming <leeming@lyx.org>
|
||||
|
||||
* PreviewLoader.C (startLoading): remove the "sh " prefix from the
|
||||
preview -> bitmap command. Doesn't work with python scripts...
|
||||
|
||||
2003-10-22 Angus Leeming <leeming@lyx.org>
|
||||
|
||||
* GraphicsConverter.C (Impl c-tor): add a warning message if the file
|
||||
|
||||
@ -482,7 +482,7 @@ void PreviewLoader::Impl::startLoading()
|
||||
cs << pconverter_->command << ' ' << latexfile << ' '
|
||||
<< int(font_scaling_factor_) << ' ' << pconverter_->to;
|
||||
|
||||
string const command = "sh " + LibScriptSearch(STRCONV(cs.str()));
|
||||
string const command = LibScriptSearch(STRCONV(cs.str()));
|
||||
|
||||
// Initiate the conversion from LaTeX to bitmap images files.
|
||||
Forkedcall::SignalTypePtr convert_ptr(new Forkedcall::SignalType);
|
||||
|
||||
@ -25,6 +25,10 @@ What's new
|
||||
- updated basque, danish, german, italian and romanian localizations;
|
||||
updated basque and german documentations
|
||||
|
||||
- the script used to control the generation of bitmap images for use
|
||||
in 'Instant Preview' of math equations has been re-written in python.
|
||||
Windows users now have some chance of getting Instant Preview to
|
||||
work for them.
|
||||
|
||||
** Bug fixes
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user