I wrote diotalevi's grep. It's one distinguishing feature is automatically looking inside tarballs and zip files. I find that's really common for me. It does a dirt simple look at the file extension and opens .tgz/.zip/.whatever using the streaming abilities of archive extraction programs. The code isn't sexy and it isn't even good but it does do a pretty good enough job. It'd be possible to do a much better job given a few minutes and the interest. I'd use ack immediately if it got this feature.

sub open_file_harder {
    my ($filename) = @_;
    return if not defined $filename;

    if ( my ($extension) = $filename =~ /(\.[^.]+)\z/mx ) {
        my @readers = (
            [ qr/\.t(?:ar\.)?gz\z/ => qw( gzcat ),    $filename ],
            [ qr/\.zip\z/,         => qw( unzip -p ), $filename ],
            [ qr/\.Z\z/            => qw( zcat ),     $filename ],
            [ qr/\.gz\z/           => qw( gzcat ),    $filename ],
            [ qr/\.bz2\z/          => qw( bzcat ),    $filename ],
        );
        for my $reader (@readers) {
            my ( $pattern, @command ) = @{$reader};
            if ( $extension =~ $pattern ) {
                open3( undef, my $fh, undef, @command );
                return $fh;
            }
        }
    }

    open my $fh, '<', $filename
        or die "Couldn't open $filename: $!";
    return $fh;
}

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In reply to Re: Top 10 reasons to start using ack by diotalevi
in thread Top 10 reasons to start using ack by petdance

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