filter.sh

#!/bin/sh
#
# Copyright (c) 2000-2025 Matthew Pearson <matthewpearson@gmail.com>.
#
# These scripts are free. There is no warranty; your mileage may vary.
# Visit http://creativecommons.org/licenses/by-nc-sa/4.0/ for more details.
#
# replace vars in dotfiles and scripts with their assigned values
#
# shellcheck disable=SC2006		# $() doesn't work in old Bourne shells
#

PATH=.	# for sourcing from current directory

if [ $# -eq 2 ]
then
	[ -f "$1" ] && [ -f "$2" ] || exit 1
	conf1=$1
	conf2=
	ffile=$2
	. "$conf1"
elif [ $# -eq 3 ]
then
	[ -f "$1" ] && [ -f "$2" ] && [ -f "$3" ] || exit 1
	conf1=$1
	conf2=$2
	ffile=$3
	. "$conf1"
	. "$conf2"
else
	exit 1
fi

PATH=/usr/xpg4/bin:/bin:/usr/bin

# promote ksh scripts to bash if ksh is not available
[ -x /bin/ksh ] || sedexp="-e 's|^#!/bin/ksh|#!/bin/bash|g'"

# note that conf2 is optional and thus cannot be quoted like conf1 can
for var in `sed -n '/^[A-Z_]*=/p' "$conf1" $conf2 | sed 's/=.*//'`
do
	left=$var
	right="`eval echo '$'${var}`"
	sedexp=${sedexp:+"$sedexp "}"-e 's|__${left}__|${right}|g'"
done

eval sed ${sedexp} "./$ffile"

#EOF __TAGGED__