#!/usr/bin/perl -w

=head1 NAME

dh_autoreconf_clean - Clean all changes made by dh_autoreconf

=cut

use strict;
use Debian::Debhelper::Dh_Lib;

=head1 SYNOPSIS

B<dh_autoreconf_clean> [S<I<debhelper options>>]

=head1 DESCRIPTION

dh_autoreconf_clean removes all files which have been created or changed
during the autoreconf call executed by L<dh_autoreconf(1)>. It also reverts
any ltmain.sh patch applied by dh_autoreconf.

=cut

init();

# PROMISE: DH NOOP WITHOUT autoreconf.before autoreconf.after

# autoreconf failed, just remove the 'before' file.
if (-r 'debian/autoreconf.before' && ! -r 'debian/autoreconf.after') {
    doit("rm", "debian/autoreconf.before");
    exit 0;
}

if (! -r 'debian/autoreconf.before' || ! -r 'debian/autoreconf.after') {
    exit 0;
}

# Mapping of filename => md5sum.
my %file = ();
# An array of the names of the files which should be removed.
my @delete = ();

# Read the old files in
open(FILE, 'debian/autoreconf.before') or die($!);

while(<FILE>) {
    chomp($_);
    my ($checksum, $filename) = split(' ', $_, 2);

    $file{$filename} = $checksum;
}
close(FILE);

# Read the new files
open(FILE, 'debian/autoreconf.after') or die($!);

my $ltcheck = "";
while(<FILE>) {
    chomp($_);
    my ($checksum, $filename) = split(' ', $_, 2);

    if ($filename eq "/usr/share/libtool/build-aux/ltmain.sh") {
        $ltcheck = $checksum;
    } elsif ($filename eq "/usr/share/libtool/config/ltmain.sh") {
        $ltcheck = $checksum;
    } elsif (!defined($file{$filename}) || $file{$filename} ne $checksum) {
        # Remove non-excluded, changed files
        push @delete, $filename;
    } elsif ($checksum eq $ltcheck) {
        # A valid ltmain.sh, reverse patch
        doit("patch", "-R", "-f", "--no-backup-if-mismatch", "-i",
             "/usr/share/dh-autoreconf/ltmain-as-needed.diff",
             $filename);
    }
}
close(FILE);

# Cleanup
doit("rm", "-f", "--", @delete) if @delete;
doit("rm", "-f", "debian/autoreconf.before", "debian/autoreconf.after");

=head1 SEE ALSO

L<debhelper(7)>, L<dh_autoreconf(1)>, L<dh-autoreconf(7)>

=head1 AUTHOR

Julian Andres Klode <jak@debian.org>

=cut