#! /bin/sh
# lineno - Replace instances of @LINENO@ with the file's current line number
# Gordon Matzigkeit <gord@gnu.ai.mit.edu>, 1997

# Copyright (C) 1992, 1993, 1994, 1996, 1997 Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.

AWK=${AWK-awk}
delete=no
files=
progname=`echo "$0" | sed 's%^.*/%%'`

for arg
do
  case "$arg" in
  --delete) delete=yes ;;

  --help)
    cat <<EOF
Usage: $progname [OPTION]... FILE...

Substitute @LINENO@ for the current output line number.

    --delete      delete files that cannot be converted
    --help        display this message and exit
    --version     print version information

Each FILE is the name of a file to modify.
EOF
    exit 0
    ;;

  --version)
    echo "GNU lineno 1.0"
    exit 0
    ;;

  -*)
    echo "$progname: unrecognized option \`$arg'" 1>&2
    exit 1
    ;;

  *) files="$files $arg" ;;
  esac
done

if test -z "$files"; then
  echo "$progname: no FILES specified" 1>&2
  exit 1
fi

# Manage a temp file.
tmpfile="$progname.$$"
trap "rm -f $tmpfile; exit 1" 1 2 15

status=0
for file in $files; do
  if test -f "$file"; then :
  else
    status=1
    echo "$progname: \`$file' is not a file" 1>&2
  fi

  # Skip empty files.
  test -s "$file" || continue

  # Transliterated from a section in autoconf (Autoconf 2.12).
  $AWK '
  /@LINENO@/ { printf "%d:", NR }
	     { print }
' $file | sed '/@LINENO@/s/^\([0-9][0-9]*\):\(.*\)@LINENO@/\2\1/' > $tmpfile

  if test -s "$tmpfile"; then
    cp $tmpfile $file && continue
  fi

  if test "$delete" = yes; then
    echo "$progname: deleting \`$file'" 1>&2
    rm -f $file
  fi
done

rm -f $tmpfile
exit $status