#!/bin/sh
# run from the prerm and postinst
set -e

script=$1
mode=$2

. /usr/share/debconf/confmodule

gen_file_overwrite () {
	before=$1; after=$2; infile=$3; outfile=$4; backupmode=$5; backup=$6
	perl -pe '
 s/^('"$regexp"'\s+)\-'$before'\-(fixed-medium-r-semicondensed)/$1-'$after'-$2/
		' <$infile >$outfile.tmp
	if cmp -s $outfile.tmp $outfile; then
		rm $outfile.tmp
		return
	fi
	echo " Updating $file ($before=>$after)..."
	case $backupmode in
	once)
		if ! test -e $backup; then
			ln $outfile $backup
		fi
		;;
	never)
		;;
	esac
	mv -f $outfile.tmp $outfile

	case "$file" in
	*.alias) update-fonts-alias misc ;;
	esac
}

check_file () {
	dckey=$1; regexp=$2; file=$3

	if ! test -f $file; then return; fi

	needundo=true

	case "$script.$mode" in
	postinst.*)
		db_get xfonts-traditional/$dckey ||:
		if [ $RET = true ]; then
			gen_file_overwrite misc trad \
				$file $file once $file.backup.not-trad
			needundo=false
		else
			gen_file_overwrite misc trad \
				$file $file.trad never
		fi
		;;
	prerm.upgrade*)
		needundo=false
		;;
	prerm.remove*)
		;;
	*)
		echo >&2 "huh $script.mode ?"
		exit 1
		;;
	esac
	if $needundo && test -f $file.backup.not-trad; then
		gen_file_overwrite trad misc \
			$file $file $file.backup.trad
		mv -f $file.backup.not-trad $file.old.not-trad
	fi
	# only ever do this once, unless we've actually undone it since
}

echo "Checking configuration..."

check_file reconfigure-xterm '\*VT100\.utf8Fonts\.font\:' \
	/etc/X11/app-defaults/XTerm

check_file remap-fixed 'fixed' \
	/etc/X11/fonts/misc/xfonts-base.alias

true