#! /usr/bin/env perl
#
# The contents of this file are subject to the Netscape Public License
# Version 1.0 (the "NPL"); you may not use this file except in
# compliance with the NPL.  You may obtain a copy of the NPL at
# http://www.mozilla.org/NPL/
#
# Software distributed under the NPL is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
# for the specific language governing rights and limitations under the
# NPL.
#
# The Initial Developer of this code under the NPL is Netscape
# Communications Corporation.  Portions created by Netscape are
# Copyright (C) 1999 Netscape Communications Corporation.  All Rights
# Reserved.
#

# acoutput-fast.pl - Quickly create makefiles that are in a common format.
#
# Most of the makefiles in mozilla only refer to two configure variables:
#     @srcdir@
#     @top_srcdir@
# However, configure does not know any better and it runs sed on each file
# with over 150 replacement rules (slow as molasses).
#
# This script takes a list of makefiles as input. For example,
#   
#     echo $MAKEFILES | acoutput-fast.pl
#
# The script creates each Makefile that only references @srcdir@ and
# @top_srcdir@. For other files, it lists them in a shell command that is
# printed to stdout:
#
#     CONFIG_FILES="unhandled_files..."; export CONFIG_FILES
#
# This command can be used to have config.status create the unhandled
# files. For example,
#
#     eval "echo $MAKEFILES | acoutput-fast.pl"
#     AC_OUTPUT($MAKEFILES)
#
# Send comments, improvements, bugs to Steve Lamm (slamm@netscape.com).

#use File::Basename;
sub dirname {
  my $dir = $_[0];
  return '.' if not $dir =~ m%/%;
  $dir =~ s%/[^/][^/]*$%%;
  return $dir;
}

$ac_given_srcdir = $0;
$ac_given_srcdir =~ s|/?build/autoconf/.*$||;
$ac_given_srcdir = '.' if $ac_given_srcdir eq '';

# Read list of makefiles from the stdin or,
#   from files listed on the command-line.
#
@makefiles=();
push @makefiles, split while (<>);

# Create all the directories at once.
#   This can be much faster than calling mkdir() for each one.
@dirs_to_create = ();
%have_seen = ();
foreach $ac_file (@makefiles) {
  next if $ac_file =~ /:/;
  $ac_dir = dirname($ac_file);
  next if defined($have_seen{$ac_dir});
  push @dirs_to_create, $ac_dir if not -d $ac_dir;
  $have_seen{$ac_dir} = 1;
}
system "mkdir ".join(' ',@dirs_to_create) if $#dirs_to_create >= 0;

# Output the makefiles.
#
@unhandled=();
foreach $ac_file (@makefiles) {
  if (not $ac_file =~ /Makefile$/ or $ac_file =~ /:/) {
    push @unhandled, $ac_file;
    next;
  }
  $ac_file_in = "$ac_given_srcdir/$ac_file.in";
  $ac_dir = dirname($ac_file);
  if ($ac_dir eq '.') {
    $ac_dir_suffix = '';
    $ac_dots = '';
  } else {
    $ac_dir_suffix = "/$ac_dir";
    $ac_dir_suffix =~ s%^/\./%/%;
    $ac_dots = $ac_dir_suffix;
    $ac_dots =~ s%/[^/]*%../%g;
  }
  if ($ac_given_srcdir eq '.') {
    $srcdir = '.';
    if ($ac_dots eq '') {
      $top_srcdir = '.'
    } else {
      $top_srcdir = $ac_dots;
      $top_srcdir =~ s%/$%%;
    }
  } elsif ($ac_given_srcdir =~ m%^/%) {
    $srcdir     = "$ac_given_srcdir$ac_dir_suffix";
    $top_srcdir = "$ac_given_srcdir";
  } else {
    $srcdir     = "$ac_dots$ac_given_srcdir$ac_dir_suffix";
    $top_srcdir = "$ac_dots$ac_given_srcdir";
  }

#  mkdir $subdir, 0777 if not -d $subdir;

  print STDERR "creating $ac_file\n";

  open (INFILE, "<$ac_file_in")
    or ( warn "can't read $ac_file_in: No such file or directory\n" and next);
  open (OUTFILE, ">$ac_file")
    or ( warn "Unable to create $ac_file\n" and next);

  while (<INFILE>) {
    if (/\@[_a-zA-Z]*\@.*\@[_a-zA-Z]*\@/) {
      #warn "Two defines on a line:$ac_file:$.:$_";
      push @unhandled, $ac_file;
      last;
    }

    s/\@srcdir\@/$srcdir/;
    s/\@top_srcdir\@/$top_srcdir/;

    if (/\@[_a-zA-Z]*\@/) {
      #warn "Unknown variable:$ac_file:$.:$_";
      push @unhandled, $ac_file;
      last;
    }
    print OUTFILE;
  }
  close INFILE;
  close OUTFILE;
}

# Print the shell command to be evaluated by configure.
#
print "CONFIG_FILES=\"".join(' ', @unhandled)."\"; export CONFIG_FILES\n";