#!/bin/sh

# uninstall-magic for VideoteXt
#
# $Id: uninstall-magic,v 1.1 1997/09/14 01:49:21 mb Exp mb $
#
# Copyright (c) 1997 Martin Buck  <martin.buck@bigfoot.com>
# Read COPYING for more information

# This script uninstalls entries from the system magic file which were put
# there by install-magic.


set -e

if [ $# -ne 1 ]; then
  echo "Usage: $0 magic-file" >&2
  exit 1
fi

trap 'rm -f "$1.vtxnew"' 0

cp -p "$1" "$1.vtxnew"
gawk '
  /^#.*VideoteXt/ {
    skip = 1
    next
  }
  /^#/ {
    if (skip == 1) {
      next
    }
    skip = 0
  } 
  (skip) {
    if (/^$/) {
      skip = 0
    } else {
      skip = 2
    }
    next
  }
  {
    print $0
  }
' "$1" > "$1.vtxnew"

ln -f "$1.vtxnew" "$1"