File Coverage

=head1 NAME

Automake::XFile - supply object methods for filehandles with error handling

=head1 SYNOPSIS

    use Automake::XFile;

    $fh = new Automake::XFile;
    $fh->open ("< file");
    # No need to check $FH: we died if open failed.
    print <$fh>;
    $fh->close;
    # No need to check the return value of close: we died if it failed.

    $fh = new Automake::XFile "> file";
    # No need to check $FH: we died if new failed.
    print $fh "bar\n";
    $fh->close;

    $fh = new Automake::XFile "file", "r";
    # No need to check $FH: we died if new failed.
    defined $fh
    print <$fh>;
    undef $fh;   # automatically closes the file and checks for errors.

    $fh = new Automake::XFile "file", O_WRONLY | O_APPEND;
    # No need to check $FH: we died if new failed.
    print $fh "corge\n";

    $pos = $fh->getpos;
    $fh->setpos ($pos);

    undef $fh;   # automatically closes the file and checks for errors.

    autoflush STDOUT 1;

=head1 DESCRIPTION

C<Automake::XFile> inherits from C<IO::File>.  It provides the method
C<name> returning the file name.  It provides dying versions of the
methods C<close>, C<lock> (corresponding to C<flock>), C<new>,
C<open>, C<seek>, and C<truncate>.  It also overrides the C<getline>
and C<getlines> methods to translate C<\r\n> to C<\n>.

=cut

=head2 Methods

=over

=item C<$fh = new Automake::XFile ([$expr, ...]>

Constructor a new XFile object.  Additional arguments
are passed to C<open>, if any.

=cut

=item C<$fh-E<gt>open ([$file, ...])>

Open a file, passing C<$file> and further arguments to C<IO::File::open>.
Die if opening fails.  Store the name of the file.  Use binmode for writing.

=cut

=item C<$fh-E<gt>close>

Close the file, handling errors.

=cut

=item C<$line = $fh-E<gt>getline>

Read and return a line from the file.  Ensure C<\r\n> is translated to
C<\n> on input files.

=cut

=item C<@lines = $fh-E<gt>getlines>

Slurp lines from the files.

=cut

=item C<$name = $fh-E<gt>name>

Return the name of the file.

=cut

=item C<$fh-E<gt>lock>

Lock the file using C<flock>.  If locking fails for reasons other than
C<flock> being unsupported, then error out if C<$ENV{'MAKEFLAGS'}> indicates
that we are spawned from a parallel C<make>.

=cut

=item C<$fh-E<gt>seek ($position, [$whence])>

Seek file to C<$position>.  Die if seeking fails.

=cut

=item C<$fh-E<gt>truncate ($len)>

Truncate the file to length C<$len>.  Die on failure.

=cut

=head1 SEE ALSO

L<perlfunc>,
L<perlop/"I/O Operators">,
L<IO::File>
L<IO::Handle>
L<IO::Seekable>

=head1 HISTORY

Derived from IO::File.pm by Akim Demaille E<lt>F<akim@freefriends.org>E<gt>.

=cut