#!/usr/local/bin/perl -w
use strict;
require 5.005;
use Getopt::Std;

# uncomment if modules from BEGIN block below
# are put into separate files
# use WalkTree;
# use File;

my ( $dir, $filter, $prune, @files, @dirs );

process_args();

my $filefunc = sub {
  if( $filter ) {
    $_[0] =~ /$filter/o
    and push @files, File->new( name => $_[0] )
  }
  else { push @files, File->new( name => $_[0] ) }
};

WalkTree::walktree( $dir, $filefunc, undef, $prune );

unless( @files ) { print "no result\n"; exit 1 }

print File->get_cnt(), " files found\n";

my @name_and_mtime = map { { 
    name => $_->get_name,
    mtime => $_->get_mtime,
    mtime_string => $_->get_mtime_string
  } } @files;
my @mtime_sorted = sort { $a->{mtime} <=> $b->{mtime} } @name_and_mtim
+e;

print "mtime sorted list of found files:\n", "-" x 40, "\n";
for ( @mtime_sorted ) {
  print $_->{mtime_string}, "\t", $_->{name}, "\n";
}

print "=" x 40, "\n";
print "runtime: ", time - $^T, " seconds.\n";
print "done.\n";

### end of main ###

# modules usually go into extra files, but to show code:
BEGIN{
{
package WalkTree;
use strict;

my $DIRSEP =
  $^O =~ /Mac/ ? ':' :
    $^O =~ /Win|OS-2|DOS/ ? '\\' : '/';

my $MACOS = ( $^O =~ /Mac/ ) || 0;
my $WINOS = ( $^O =~ /Win|OS-2|DOS/ ) || 0;

sub walktree {
  my( $dir, $filefunc, $dirfunc, $prune ) = @_;
  my @values;
  if ( -d $dir ) {
    if( $prune and $dir =~ /$prune/o ) { return undef }
    ref $dirfunc and $dirfunc->( $dir );
    local *DH;
    opendir DH, $dir or warn "opendir '$dir' failed\n$!";
    my $entry;
    while ( defined( $entry = readdir DH )) {
      !$MACOS and next if( $entry eq '.' or $entry eq '..' );
       $MACOS and next if $entry =~ /\n/;
      my $fullpath;
      if( $MACOS ) { -d "$dir$entry" ? ($fullpath = "$dir$entry$DIRSEP
+") : ($fullpath = "$dir$entry") }
      else         { $fullpath = "$dir$DIRSEP$entry" }
      if( -d $fullpath ) {
        walktree( $fullpath, $filefunc, $dirfunc, $prune );
      }
      elsif( -f $fullpath ) {
        ref $filefunc and $filefunc->( $fullpath );
      }
      push @values, $fullpath;
    }
    closedir DH;
  } 
  else {
    warn "Walktree::walktree() - need a directory argument\nyou provid
+ed '$dir'\n";
  }
  return @values;
}

1;
}

{
package File;
use strict;

# encapsulate
{
  # value 0 makes an attribute non-writable
  my %_attributes = (
    name => 1,
  );

  my $_attributes = sub { keys %_attributes };

  my $_cnt;
  my $_incr_cnt = sub{ $_cnt++ };
  sub get_cnt { $_cnt }

  sub new {
    my ($caller, %arg) = @_;
    my $caller_is_obj = ref( $caller );
    my $class = $caller_is_obj || $caller;
    my $self = bless {}, $class;

    foreach my $member ( $_attributes->() ) {
      if( $arg{ $member } ) {
        $self->{ $member } = $arg{ $member }
      }
    }
    my @stat = stat( $self->get_name );
    # hash slice assignement
    @{$self}{
      "dev", "inode", "mode", "nlink", "uid", "gid", "rdev",
      "size", "atime", "mtime", "ctime", "blksize", "blocks" } = @stat
+;
    $_incr_cnt->();
    return $self;
  }
}

sub get_name    { return $_[0]->{name}    }
sub get_dev     { return $_[0]->{dev}     }
sub get_inode   { return $_[0]->{inode}   }
sub get_mode    { return $_[0]->{mode}    }
sub get_nlink   { return $_[0]->{nlink}   }
sub get_uid     { return $_[0]->{uid}     }
sub get_gid     { return $_[0]->{gid}     }
sub get_rdev    { return $_[0]->{rdev}    }
sub get_size    { return $_[0]->{size}    }
sub get_atime   { return $_[0]->{atime}   }
sub get_mtime   { return $_[0]->{mtime}   }
sub get_ctime   { return $_[0]->{ctime}   }
sub get_blksize { return $_[0]->{blksize} }
sub get_blocks  { return $_[0]->{blocks}  }

sub get_atime_string { return _time2string( $_[0]->{atime} ) }
sub get_ctime_string { return _time2string( $_[0]->{ctime} ) }
sub get_mtime_string { return _time2string( $_[0]->{mtime} ) }

sub _time2string {
    my $in = shift;
    my( $sec, $min, $hour, $mday, $mon, $year ) = (localtime $in )[0,1
+,2,3,4,5];
    $mon++; $year += 1900;
    return sprintf "%02d.%02d.%d %02d:%02d:%02d", $mday, $mon, $year, 
+$hour, $min, $sec;
}


1;
}

}

sub process_args {
  my $MACOS = ( $^O =~ /Mac/ ) || 0;

  # default dir
  $MACOS ? ($dir = ":") : ($dir = ".");
  # give Macs a chance to provide command line parameters
  if( $MACOS ) {
    my $ans = MacPerl::Ask( 'Please enter @ARGV (-h for help)', define
+d $ARGV[0] ? $ARGV[0] : "" );
    if( $ans ) {
      usage() if $ans =~ /\b-h\b/;
      my $args = splitargs( $ans );
      @ARGV = @$args;
    }
    else { $ARGV[0] = ":" }
  }

  my %opts;
  getopts( 'f:p:h', \%opts );
  usage() if $opts{h};
  $ARGV[0] and -d $ARGV[0] and $dir = $ARGV[0] or warn "using default 
+searchdir '$dir'\n";

  if( $opts{f} ) {
    eval { $filter = qr/$opts{f}/ }
      or warn "regex '$opts{f}' cannot be compiled, continuing without
+ filter\n";
  }

  if( $opts{p} ) {
    eval { $prune = qr/$opts{p}/ }
      or warn "regex '$opts{p}' cannot be compiled, continuing without
+ pruning\n";
  }
  ## print "DEBUG: dir = $dir, filter = $filter, prune = ", defined $p
+rune ? $prune : "undef", "\n";
}

sub splitargs {
  my $s = shift;
  $s =~ s/^\s*//;
  $s =~ s/\s*$//;
  $s .= ":" unless $s =~ /:$/;
  my( $first, $rest, @args, $firstval, $firstvalcomplete );
  while( ($_ = $s) =~ /^(-.)(.*)/ ) {
    ($first, $rest) = ( $1, $2 );
    ($firstvalcomplete, $firstval) = ($rest =~ /(^\s*(.+?)\s+)/);
    $s =~ s/\Q$first$firstvalcomplete\E//;
    push @args, ($first, $firstval);
  }
  push @args, $s;
  return \@args;
}

sub usage {
  print <<eom;
$0 [-f <filter>] [-p <prune>] [-h] <search directory start>
    all arguments are optional
      default filter is undef
      default prune is undef
      defaults search directory is current working directory
    examples:
      -f pl\$ -p (?i)example /tmp
      -f pl\$ Macintosh HD:my projects:
eom
  exit 1;
}

__END__

=head1 NAME

walktree-finder.pl - portable find replacement

=head1 SYNOPSIS

    all arguments are optional
      default filter is undef
      default prune is undef
      defaults search directory is current working directory
    examples:
      -f pl$ -p (?i)example /tmp
      on Macs:
      -f pl$ Macintosh HD:my projects:
      or build a droplet and drop a folder onto it

=head1 DESCRIPTION

Demonstration of OO techniques, replacement of File::Find for shortnes
+s and flexibility.

WalkTree was taken from "The Idendity Function" slides provided by Mar
+k-Jason Dominus at
http://www.plover.com/~mjd/

=head1 BUGS/TODO

=head1 AUTHOR

Axel Rose, Winter 2001

=head1 VERSION

$Id$

=cut
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