#!/bin/sh

# $LynxId: install-cfg.sh,v 1.4 2018/03/21 16:20:42 tom Exp $

# install lynx.cfg, ensuring the old config-file is saved to a unique file,

# and prepending customizations to the newly-installed file.

#

# $1 = install program

# $2 = file to install

# $3 = where to install it

PRG="$1"

SRC=$2

DST=$3

LANG=C;		export LANG

LC_ALL=C;	export LC_ALL

LC_CTYPE=C;	export LC_CTYPE

LANGUAGE=C;	export LANGUAGE

if test -f "$DST" ; then

	echo "** checking if you have customized $DST"

	OLD=lynx-cfg.old

	NEW=lynx-cfg.new

	TST=lynx-cfg.tst

	TMP=lynx-cfg.tmp

	trap "rm -f $OLD $NEW $TST $TMP; exit 9" 1 2 5 15

	rm -f $OLD $NEW $TST $TMP

	# avoid propagating obsolete URLs into new installs

	echo lynx.isc.org >$TMP

	echo lynx.browser.org >$TMP

	echo www.trill-home.com >>$TMP

	echo www.cc.ukans.edu >>$TMP

	echo www.ukans.edu >>$TMP

	echo www.slcc.edu >>$TMP

	echo sol.slcc.edu >>$TMP

	# Make a list of the settings which are in the original lynx.cfg

	# Do not keep the user's HELPFILE setting since we modify that in

	# a different makefile rule.

	egrep '^[ 	]*[A-Za-z]' $SRC |sed -e 's/^[ 	]*HELPFILE:.*/HELPFILE:/' >>$TMP

	egrep '^[ 	]*[A-Za-z]' $SRC |fgrep -v -f $TMP >$OLD

	egrep '^[ 	]*[A-Za-z]' $DST |fgrep -v -f $TMP >$TST

	if test -s $TST ; then

		cat >$TMP <

## The following lines were saved from your previous configuration.

EOF

		cat $TST >>$TMP

		cat $SRC >$NEW

		cat $TMP >>$NEW

		# See if we have saved this information before (ignoring the

		# HELPFILE line).

		if cmp -s $NEW $OLD

		then

			echo "... installed $DST would not be changed"

		else

			NUM=1

			while test -f ${DST}-${NUM}

			do

				if cmp -s $NEW ${DST}-${NUM}

				then

					break

				fi

				NUM=`expr $NUM + 1`

			done

			if test ! -f ${DST}-${NUM}

			then

				echo "... saving old config as ${DST}-${NUM}"

				mv $DST ${DST}-${NUM} || exit 1

			fi

			echo "** installing $NEW as $DST"

			eval $PRG $NEW $DST || exit 1

		fi

	else

		echo "... no customizations found"

		echo "** installing $SRC as $DST"

		eval $PRG $SRC $DST || exit 1

	fi

	rm -f $SKIP $OLD $NEW $TST $TMP

elif cmp -s $SRC $DST

then

	echo "... installed $DST would not be changed"

else

	echo "** installing $SRC as $DST"

	eval $PRG $SRC $DST || exit 1

fi