>>>>> "Rogerio" == Rogerio Brito <[EMAIL PROTECTED]> writes:
Rogerio> On Nov 09 2000, Shao Zhang wrote:
>> Could someone give me some hints? I looked the man page for
>> psselect and psmerge and still cannot figure it out.
Rogerio> Theoretically, it would be possible if psmerge worked
Rogerio> correctly (I unfortunately haven't got it to work as I'd
Rogerio> like).
Rogerio> Anyway, to split the first file in two files with the
Rogerio> pages you'd like, you might try to use gv, select the
Rogerio> pages accordingly and then save them to different files.
Rogerio> Then after that, you'd have three files and you'd use
Rogerio> psmerge to glue them together. But, as I've stated
Rogerio> before, I couldn't get it to work.
It works OK for me...
Here is me (hacked?) script designed only to print pages that have
changed since the last time I printed the document. I will include it
here, because it uses psselect to split up the document, removes
variable stuff that may not be relevant to the comparison (eg.
filenames), compares each page one by one, and then psmerge to merge
it back together again.
#!/bin/sh -e
# (C)opyright 2000 Brian May
# May be distributed under the terms and conditions of the GPLv2.
# Debian users: See /usr/share/common-licenses/GPL.
# known bug: script gets confused if no changes exist. This is
# because expressions like *.ps don't expand to a null list.
usage () {
echo "diffps, find the differences between two PS files." >&2
echo " usage: diffps [-l|--log][-d|--doubleside] old.ps new.ps output.ps"
>&2
}
######################
# PARSE COMMAND LINE #
######################
# stolen from /usr/bin/fakeroot, Debian potato version.
GETOPTEST=`getopt --version`
case $GETOPTEST in
getopt*) # GNU getopt
TEMP=`getopt -n diffps -l log,doubleside,help -- +ldh "$@"`
;;
*) # POSIX getopt ?
TEMP=`getopt dh "$@"`
;;
esac
if test "$?" != "0"; then
echo Terminating...
exit 1
fi
eval set -- "$TEMP"
while test "$1" != "--"; do
case $1 in
-l|--log)
log=1;
;;
-d|--doublepage)
double=1;
;;
-h|--help)
usage;
exit 0
;;
esac
shift
done
shift
if [ $# -lt 3 ]
then
usage
exit
fi
A=$1; shift
B=$1; shift
OUT=$1; shift
####################################
# Extract all pages from a PS file #
####################################
extract() {
CASE=$1
FILE=$2
SECT=1
PAGE=1
LPAGE=0
APAGE=illegal
echo -n "Extracting $FILE to $TMPDIR/$CASE-... " >&2
while [ $APAGE ]
do
if [ $double ]
then
# if double sided, try to extract two pages
psselect $FILE -p$PAGE,$[PAGE+1] -q > $TMPDIR/new.ps
else
# otherwise, extract one page
psselect $FILE -p$PAGE -q > $TMPDIR/new.ps
fi
# get the internal page number
APAGE=`awk '/%%Page: / {print $2; exit}' < $TMPDIR/new.ps`
if [ -z $APAGE ]
then
# if no internal page number exists, then stop
rm $TMPDIR/new.ps
else
# otherwise save the page
if [ $APAGE -le $LPAGE ]
then
# if numbers overlap, then increment section number
SECT=$[$SECT + 1]
fi
LPAGE=$APAGE
# only save the PS file if double sided and this is an odd page...
ODDPAGE=$[PAGE % 2]
if [ "$double" -a $ODDPAGE -eq 1 ]
then
# remove variables and save
grep -v -E
'^%(DVIPSSource|%Creator|%CreationDate|%Title|DVIPSCommandLine):' <
$TMPDIR/new.ps \
| sed 's/^\(TeXDict begin .*\) (.*\.dvi)/\1/' \
| awk '/^%DVIPSBitmapFont/ { x=1; } {if (!x) print }
/%EndDVIPSBitmapFont/ { x=0; }' > $TMPDIR/$CASE-$PAGE.ps
fi
# ...or if not doubled sided.
if [ -z $double ]
then
# remove variables and save
grep -v -E
'^%(DVIPSSource|%Creator|%CreationDate|%Title|DVIPSCommandLine):' <
$TMPDIR/new.ps \
| sed 's/^\(TeXDict begin .*\) (.*\.dvi)/\1/' \
| awk '/^%DVIPSBitmapFont/ { x=1; } {if (!x) print }
/%EndDVIPSBitmapFont/ { x=0; }' > $TMPDIR/$CASE-$PAGE.ps
fi
# try an get date from the PS file
awk '/%DVIPSSource: / {split($4,A,/:/); printf("%s",A[1]); exit}' <
$TMPDIR/new.ps > $TMPDIR/$CASE-$PAGE.ps.date
# save some other details
echo -n "$PAGE" > $TMPDIR/$CASE-$PAGE.ps.ppage
echo -n "$SECT-$APAGE" > $TMPDIR/$CASE-$PAGE.ps.apage
# delete original
rm $TMPDIR/new.ps
fi
#increment page count
PAGE=$[$PAGE + 1]
done
echo "done." >&2
}
#########################
# create temp directory #
#########################
TMPDIR=/tmp/$$
trap "rm -rf $TMPDIR" EXIT
mkdir $TMPDIR
# extract both files.
extract A $A
extract B $B
############################################
# delete pages in B that are the same in A #
############################################
echo -n "Finding similar pages... " >&2
for bname in $TMPDIR/B-*.ps
do
aname=`echo $bname | sed 's/\/B-/\/A-/'`
if [ ! -f $aname ];
then
echo -n "" >&2
elif diff -q $aname $bname > /dev/null;
then
# files are the same, delete
echo -n "" >&2
rm $bname
else
#debug
#echo $aname $bname
#diff $aname $bname || true
echo -n "" >&2
fi
done
echo "done." >&2
########################################
# get list of pages that are different #
########################################
echo -n "Getting list of pages to extract... " >&2
for bname in $TMPDIR/B-*.ps
do
PPAGE=`cat $bname.ppage`
echo $PPAGE >> $TMPDIR/list
done
##################################
# sort list of pages, and record #
##################################
for PPAGE in `sort -n < $TMPDIR/list`
do
# save current page
bname="$TMPDIR/B-$PPAGE.ps"
LIST="$LIST$PPAGE,"
if [ $log ]
then
cat $bname.apage
echo -n " "
cat $bname.date
echo ""
fi
rm $bname
rm $bname.apage
rm $bname.ppage
rm $bname.date
# if double sided, also do the next page
PPAGE=$[$PPAGE + 1]
bname="$TMPDIR/B-$PPAGE.ps"
# ... but only if this page exists
if [ "$double" -a -f $bname.apage ]
then
LIST="$LIST$PPAGE,"
if [ "$log" ]
then
cat $bname.apage
echo -n " "
cat $bname.date
echo ""
fi
rm $bname.apage
rm $bname.ppage
rm $bname.date
fi
done
echo "done." >&2
##########################
# extract required pages #
##########################
echo -n "Extracting pages from $B to $OUT... " >&2
psselect -p${LIST}999 -q $B $OUT
echo "done." >&2
Sometimes, believe it or not, it works!!!!!!
I use this script with another script that attempts to compile the
LaTeX document with change-bars (actually this is somewhat broken,
because LaTeX wasn't designed with change-bars in mind), and keeps a
record of when the most up-to-date page was printed.
Improvements welcome ;-).
--
Brian May <[EMAIL PROTECTED]>
