#! /bin/sh

#   edit-readme-alpha - edit README file for alpha releases
#   Copyright (C) 2010-2013 Free Software Foundation, Inc.
#   Written by Gary V. Vaughan, 2010
#
#   This file is part of GNU Libtool.
#
# GNU Libtool 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 of
# the License, or (at your option) any later version.
#
# GNU Libtool 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 GNU Libtool; see the file COPYING.  If not, a copy
# can be downloaded from  http://www.gnu.org/licenses/gpl.html,
# or obtained by writing to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
####

# We used to maintain separate (but extremely similiar!) README and
# README.alpha files, and had 'make dist' include the right one in a
# distribution based on the contests of '$(VERSION)'.
#
# Now, we have 'make dist' call this script to tweak the first paragraph
# of README in situ, to be more suitable for an alpha quality release.

EXIT_SUCCESS=0
EXIT_FAILURE=1

# Work around backward compatibility issue on IRIX 6.5. On IRIX 6.4+, sh
# is ksh but when the shell is invoked as "sh" and the current value of
# the _XPG environment variable is not equal to 1 (one), the special
# positional parameter $0, within a function call, is the name of the
# function.
progpath=$0

# The name of this program:
progname=`echo "$progpath" |sed 's|^.*/||'`


# func_fatal_error ARG...
# -----------------------
# Echo program name prefixed message to standard error, and exit.
func_fatal_error ()
{
    echo "$progname: $*" >&2
    exit $EXIT_FAILURE
}


for file in "$@"; do
  # Assume that read-only README indicates that we are running inside
  # the latter part of a 'make distcheck'.
  test -w "$file" || {
    echo "$progname: not editing non-writeable '$file' (distcheck?)" >&2
    continue
  }

  # Make sure the paragraph we are matching has not been edited since
  # this script was written.
  matched=`sed -n -e '/^This is GNU Libtool,/,/^interface\.$/p' $file \
           |wc -l |sed 's|^ *||'`

  # Unless, of course, it was edited by this script already.
  test 3 = "$matched" \
      || matched=`sed -n -e '/^This is an alpha testing release/,/behind a consistent, portable interface\.$/p' $file \
                  |wc -l |sed 's|^ *||'`

  test 3 = "$matched" \
      || func_fatal_error "$file format has changed, please fix '$0'"

  # Don't leave file droppings.
  trap 'x=$?; rm $file.T; exit $x' 1 2 13 15

  # Edit the first paragraph to be suitable for an alpha release.
  sed -e '/^This is GNU Libtool,/,/^interface.$/c\
This is an alpha testing release of GNU Libtool, a generic library\
support script.  Libtool hides the complexity of using shared libraries\
behind a consistent, portable interface.' $file > $file.T

  # Diagnose redirection failure.
  test -f "$file.T" || func_fatal_error "Unable to write $file.T"

  # Overwrite the original file with our edited version.
  mv $file.T $file || func_fatal_error "Unable to edit $file"
done

exit $EXIT_SUCCESS