#!/bin/sh
# Increment serial number in Autoconf *.m4 files.

# Copyright (C) 2021 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, see <https://www.gnu.org/licenses/>.

scriptversion=2021-04-11

copyright_year=`echo "$scriptversion" | sed -e 's/[^0-9].*//'`
copyright="Copyright (C) ${copyright_year} Free Software Foundation, Inc.
License GPLv2+: GNU GPL version 2 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law."

usage="Usage: $0 [FILE...]

Increments the serial number, if present, in each of the files.

Options:
  --version                output version information and exit
  --help                   print this help text and exit

Send patches and bug reports to <bug-gnulib@gnu.org>."

# Based on
# <https://www.gnu.org/software/sed/manual/html_node/Increment-a-number.html>
sed_inc_serial='1,10 {
  /serial *[0-9]/ {
    s/\(serial *[0-9][0-9]*\)/\1~/
    :a
    s/\(serial *[0-9]*\)9\(_*\)~/\1_\2~/
    ta
    s/\(serial *\)\(_*\)~/\11\2~/
    tb
    s/\(serial *[0-9]*\)8\(_*\)~/\19\2~/
    tb
    s/\(serial *[0-9]*\)7\(_*\)~/\18\2~/
    tb
    s/\(serial *[0-9]*\)6\(_*\)~/\17\2~/
    tb
    s/\(serial *[0-9]*\)5\(_*\)~/\16\2~/
    tb
    s/\(serial *[0-9]*\)4\(_*\)~/\15\2~/
    tb
    s/\(serial *[0-9]*\)3\(_*\)~/\14\2~/
    tb
    s/\(serial *[0-9]*\)2\(_*\)~/\13\2~/
    tb
    s/\(serial *[0-9]*\)1\(_*\)~/\12\2~/
    tb
    s/\(serial *[0-9]*\)0\(_*\)~/\11\2~/
    tb
    :b
    s/\(serial *[0-9]*\)_/\10/
    tb
    s/\(serial *[0-9]*\)~/\1/
  }
}'

# func_process FILE
func_process ()
{
  sed -i -e "$sed_inc_serial" "$1" || exit 1
}

while test $# -gt 0; do
  case "$1" in
    --version)
      set -e
      echo "increment-serial $scriptversion"
      echo "$copyright"
      echo
      printf 'Written by %s.\n' "Bruno Haible"
      exit 0
      ;;
    --help)
      set -e
      echo "$usage"
      exit 0
      ;;
    --)
      shift
      while test $# -gt 0; do
        case "$1" in
          -*) func_process "./$1" ;;
          *)  func_process "$1" ;;
        esac
        shift
      done
      break
      ;;
    -*)
      echo "$0: Unknown option '$1', try '$0 --help'" 1>&2
      exit 1
      ;;
    *)
      func_process "$1"
      ;;
  esac
  shift
done
exit 0