/ 
File-Fu-v0.0.7
River stage one • 4 direct dependents • 4 total dependents
/ File::Fu::Dir

NAME

File::Fu::Dir - a directoryname object

SYNOPSIS

use File::Fu;

my $dir = File::Fu->dir("path/to/dir");
$dir->e and warn "$dir exists";

$dir->l and warn "$dir is a link to ", $dir->readlink;

foreach my $entry ($dir->list) {
  warn $entry . ': ' . $entry->stat->size, "\n"
    if($entry->f);
}

Constructor

new

my $dir = File::Fu::Dir->new($path);

my $dir = File::Fu::Dir->new(@path);

Class Constants/Methods

file_class

Return the corresponding file class for this dir object.

my $fc = $class->file_class;

is_dir

Always true for a directory.

is_file

Always false for a directory.

temp_dir_class

my $class = File::Fu::Dir->temp_dir_class;

temp_file_class

my $class = File::Fu::Dir->temp_file_class;

Methods

stringify

my $string = $dir->stringify;

bare

Stringify without the trailing slash/assertion.

my $str = $self->bare;

The trailing slash causes trouble when trying to address a symlink to a directory via a dir object. Thus, -l $dir doesn't work, but $dir->l does the same thing as -l $dir->bare.

file

Create a filename object with $dir as its parent.

my $file = $dir->file($filename);

my $file = $dir + $filename;

append

Append a string only to the last directory part.

$dir->append('.tmp');

$dir %= "something";

subdir

$newdir = $dir->subdir('foo');

$dir /= 'foo';

part

Returns the $i'th part of the directory list.

my $part = $dir->part($i);

$dir->part(-1) is like $dir->basename, but not an object and not quite like File::Basename::basename() when it comes to the / directory.

end

Shorthand for part(-1);

parts

Retrieve the inner list of the directory's parts.

my @parts = $dir->parts;

my @parts = $dir->parts(0..2);

The returned parts will be contiguous, but the request can be a two-element list (and can also start or end at negative indices.)

my @parts = $dir->parts(3, 7);

my @parts = $dir->parts(3, -1);

my @parts = $dir->parts(-5, -1);

slice

Returns a new dir object as the return of parts().

my $slice = $dir->slice(0);

my $slice = $dir->slice(0,3);

map

Execute a callback on each part of $dir. The sub should modify $_ (yes, this is slightly unlike the map() builtin.)

If $parts is defined as an integer or array reference of integers, it will be treated as a slice on the directory parts to which the map should be applied.

$dir->map(sub {...}, [@parts]);

$dir &= sub {s/foo$/bar/};

So, to modify only the first directory part:

$dir->map(sub {s/foo$/bar/}, 0);

Properties

is_cwd

True if the $dir represents a relative (e.g. '.') directory.

my $bool = $dir->is_cwd;

basename

Returns the last part of the path as a Dir object.

my $bit = $dir->basename;

dirname

Returns the parent parts of the path as a Dir object.

my $parent = $dir->dirname;

absolute

Get an absolute name (without checking the filesystem.)

my $abs = $dir->absolute;

absolutely

Get an absolute path (resolved on filesystem, so it must exist.)

my $abs = $dir->absolutely;

Doing stuff

open

Calls opendir(), but throws an error if it fails.

my $dh = $dir->open;

Returns a directory handle, for e.g. readdir().

my @files = map({$dir + $_} grep({$_ !~ m/^\./} readdir($dh)));

touch

Update the timestamp of a directory (croak if it doesn't exist.)

$dir->touch;

list

my @paths = $dir->list(all => 1);

lister

my $subref = $dir->lister(all => 1);

contents

Equivelant to readdir. With the 'all' option true, returns hidden names too (but not the '.' and '..' entries.)

The return values are strings, not File::Fu objects.

my @names = $dir->contents(all => 1);

iterate_contents

Returns a subref which will iterate over the directory's contents.

my $subref = $dir->iterate_contents(all => 1);

find

Recursively search a directory's contents for items where the supplied coderef (matcher) returns true. The matcher will be invoked with the topic ($_) set to the current path (which is either a Dir or File object.) The return values will be File::Fu::File or File::Fu::Dir objects.

If your matcher returns true, the topic will be added to the return values.

my @paths = $dir->find(sub {m/foo/});

There is a knob for controlling recursion, which is the first argument to your matcher.

my @pm_files = $dir->find(sub {
  return shift->prune
    if($_->is_dir and $_->part(-1) =~ m/^\.svn$/);
  $_->is_file and m/\.pm$/;
});
Differences from File::Find::find()

The invocant ($dir aka '.') is not examined (because this is an object method, there is always only one starting path.)

The topic is always absolute in the same sense as the invocant. That is, if $dir is relative to your current directory, then so are the topics and return values. If $dir is absolute, so are the topics and return values.

finder

Returns an iterator for finding files. This iterator does everything that find() does, but returns one path at a time. Returns undef when exhausted and zero when it is just taking a break.

my $subref = $dir->finder(sub {$_->is_file and $_->file =~ m/foo/});

This allows a non-blocking find.

while(defined(my $path = $subref->())) {
  $path or next; # 0 means 'not done yet'
  # do something with $path (a file or dir object)
}

The find() method is implemented in terms of finder() by simply using a while() loop and accumulating the return values.

The FindKnob object

The FindKnob object allows you to control the next steps of find(). Methods called on it will typically return a value which also makes sense as a return value of your matcher sub. Thus the idiom:

$dir->find(sub {return shift->prune if(condition); ...})
prune

Do not recurse into the topic directory. Returns false.

mkdir

Create the directory or croak with an error.

$dir->mkdir;

$dir->mkdir(0700);

create

Create the directory, with parents if needed.

$dir->create;

rmdir

Remove the directory or croak with an error.

$dir->rmdir;

remove

Remove the directory and all of its children.

$dir->remove;
$link->unlink;

Create a symlink which points to $dir.

my $link = $dir->symlink($linkname);

Note that symlinks are relative to where they live, so if $dir is a relative path, it must be relative to $linkname.

my $to = $file->readlink;

Changing Directories

chdir

Change to the directory in self, returning a new '.' directory object.

$dir = $dir->chdir;

chdir_for

Change to $dir and run the given subroutine. The sub will be passed a './' directory object.

$dir->chdir_for(sub {...});

chdir_local

Change to $dir, but return to the current cwd when $token goes out of scope.

my $token = $self->chdir_local;

Temporary Directories and Files

These methods use the $dir object as a parent location for the temp path. To use your system's global temp space (e.g. '/tmp/'), just replace $dir with 'File::Fu'.

File::Fu->temp_dir;              # '/tmp/'
File::Fu->dir->temp_dir;         # './'
File::Fu->dir("foo")->temp_dir;  # 'foo/'

File::Fu->temp_file;             # '/tmp/'
File::Fu->dir->temp_file;        # './'
File::Fu->dir("foo")->temp_file; # 'foo/'

temp_dir

Return a temporary directory in $dir.

my $dir = $dir->temp_dir;

temp_file

Return a filehandle to a temporary file in $dir.

my $handle = $dir->temp_file;

AUTHOR

Eric Wilhelm @ <ewilhelm at cpan dot org>

http://scratchcomputing.com/

BUGS

If you found this module on CPAN, please report any bugs or feature requests through the web interface at http://rt.cpan.org. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

If you pulled this development version from my /svn/, please contact me directly.

COPYRIGHT

Copyright (C) 2008 Eric L. Wilhelm, All Rights Reserved.

NO WARRANTY

Absolutely, positively NO WARRANTY, neither express or implied, is offered with this software. You use this software at your own risk. In case of loss, no person or entity owes you anything whatsoever. You have been warned.

LICENSE

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.