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#!/bin/sh -ex
# $Id$
# Public domain. Originally written by Karl Berry, 2015.
# This tiny script is used from ctan2tds as a specialinsrunner.
#
# The problem is that a number of packages make it impossible to
# generate derived files (.sty) from their .dtx without also
# regenerating the documentation (.pdf). Which we do not want to do,
# because remaking the doc generally involves many steps, external
# programs, and who knows what else.
#
# Thus this script saves foo.pdf, runs pdflatex foo.tex, then restores
# foo.pdf. That way we get the derived files but the author's .pdf.
#
# Authors are sometimes responsive to supporting an alternate method for
# running the dtx that does not remake the doc (e.g., \ifpdf), but not
# always. So we need this workaround.
#
# With a first arg --engine, the second arg is the name of the program
# to invoke, instead of pdflatex.
if test x"$1" = x--engine; then
shift
engine=$1; shift
else
engine=pdflatex
fi
basefile=`echo "$1" | sed 's/\.[^.]*$//'`
mv "$basefile.pdf" save.pdf
$engine "$@" </dev/null
mv save.pdf "$basefile.pdf"
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