#!/usr/bin/perl -w

# this script patches a config.status file, to use our own perl script

# in the main loop

# we do it this way to circumvent hacking (and thereby including)

# autoconf function (which are GPL) into our LGPL acinclude.m4.in

# written by Michael Matz <matz@kde.org>

# adapted by Dirk Mueller <mueller@kde.org>

#

#   This file is free software; you can redistribute it and/or

#   modify it under the terms of the GNU Library General Public

#   License as published by the Free Software Foundation; either

#   version 2 of the License, or (at your option) any later version.

#   This library 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

#   Library General Public License for more details.

#   You should have received a copy of the GNU Library General Public License

#   along with this library; see the file COPYING.LIB.  If not, write to

#   the Free Software Foundation, Inc., 59 Temple Place - Suite 330,

#   Boston, MA 02111-1307, USA.

# we have to change two places

# 1. the splitting of the substitutions into chunks of 90 (or even 48 in

#    later autoconf's

# 2. the big main loop which patches all Makefile.in's

use File::Basename;

my $ac_aux_dir = dirname($0);

my ($flag);

local $ac_version = 0;

my $vpath_seen = 0;

$flag = 0;

while (<>) {

# usage of $flag: 0 -- we have seen nothing yet

#   1 -- we are in (1)

#   2 -- we have ended (1)

#   3 -- we are in (2)

#   4 -- we ended (2)

    if ($flag == 4) {

        print;

    } elsif ($flag == 0) {

# 1. begins with (including): "ac_max_sed_\S+\s*=\s*[0-9]+..."

#    ends with (excluding) "CONFIG_FILE=..."

#    in later autoconf (2.14.1) there is no CONFIG_FILES= line,

#    but instead the (2) directly follow (1)

        if (/^\s*ac_max_sed_([a-z]+).*=\s*([0-9]+)/ ) {

	    $flag = 1;

	    if ($1 eq 'lines') {

                # lets hope its different with 2141, 

                # wasn't able to verify that

              if ($2 eq '48') {

                $ac_version = 250;

              }

              else {

	        $ac_version = 2141;

              }

	    } elsif ($1 eq 'cmds') {

	        $ac_version = 213;

	    }

	    # hmm, we don't know the autoconf version, but we try anyway

	} else {

	    print;

	}

    } elsif ($flag == 1) {

        if (/^\s*CONFIG_FILES=/ && ($ac_version != 250)) {

	     print;

	     $flag = 2;

	} elsif (/^\s*for\s+ac_file\s+in\s+.*CONFIG_FILES/ ) {

	     $flag = 3;

	}

    } elsif ($flag == 2) {

# 2. begins with: "for ac_file in.*CONFIG_FILES"  (the next 'for' after (1))

#    end with: "rm -f conftest.s\*"

# on autoconf 250, it ends with '# CONFIG_HEADER section'

	if (/^\s*for\s+ac_file\s+in\s+.*CONFIG_FILES/ ) {

	    $flag = 3;

	} else {

	    print;

	}

    } elsif ($flag == 3) {

        if (/^\s*rm\s+-f\s+conftest/ ) {

	    $flag = 4;

	    &insert_main_loop();

	} elsif (/^\s*rm\s+-f\s+.*ac_cs_root/ ) {

	    $flag = 4;

	    &insert_main_loop();

	    #die "hhhhhhh";

	    if ($ac_version != 2141) {

	        print STDERR "hmm, don't know autoconf version\n";

	    }

        } elsif (/^\#\s*CONFIG_HEADER section.*/) {

          $flag = 4;

          &insert_main_loop();

          if($ac_version != 250) {

            print STDERR "hmm, something went wrong :-(\n";

          }

	} elsif (/VPATH/ ) {

	    $vpath_seen = 1;

	}

    }

}

die "wrong input (flag != 4)" unless $flag == 4;

print STDERR "hmm, don't know autoconf version\n" unless $ac_version;

sub insert_main_loop {

  if ($ac_version == 250) {

    &insert_main_loop_250();

  }

  else {

    &insert_main_loop_213();

  }

}

sub insert_main_loop_250 {

  print <

  #echo Doing the fast build of Makefiles -- autoconf $ac_version

EOF

    if ($vpath_seen) {

        print <

        # VPATH subst was seen in original config.status main loop

  echo '/^[ 	]*VPATH[ 	]*=[^:]*\$/d' >>\$tmp/subs.sed

EOF

      }

  print <

  rm -f \$tmp/subs.files

  for ac_file in .. \$CONFIG_FILES ; do

      if test "x\$ac_file" != x..; then

          echo \$ac_file >> \$tmp/subs.files

      fi

  done

  if test -f \$tmp/subs.files ; then

      perl $ac_aux_dir/config.pl "\$tmp/subs.sed" "\$tmp/subs.files" "\$srcdir" "\$INSTALL"

  fi

  rm -f \$tmp/subs.files

fi

EOF

  return;

}

sub insert_main_loop_213 {

    print <

#echo Doing the fast build of Makefiles -- autoconf $ac_version

if test "x\$ac_cs_root" = "x" ; then

    ac_cs_root=conftest

fi

EOF

    if ($vpath_seen) {

      print <

# VPATH subst was seen in original config.status main loop

echo '/^[ 	]*VPATH[ 	]*=[^:]*\$/d' >> \$ac_cs_root.subs

EOF

    }

    print <

rm -f \$ac_cs_root.sacfiles

for ac_file in .. \$CONFIG_FILES ; do

    if test "x\$ac_file" != x..; then

        echo \$ac_file >> \$ac_cs_root.sacfiles

    fi

done

if test -f \$ac_cs_root.sacfiles ; then

    perl $ac_aux_dir/config.pl "\$ac_cs_root.subs" "\$ac_cs_root.sacfiles" "\$ac_given_srcdir" "\$ac_given_INSTALL"

fi

rm -f \$ac_cs_root.s*

EOF

    return;

}