Path::Iter(3) User Contributed Perl Documentation Path::Iter(3)
NAME
Path::Iter - Simple Efficient Path Iteration
VERSION
This document describes Path::Iter version 0.2
SYNOPSIS
use Path::Iter;
my $fetch = Path::Iter::get_iterator('foo');
while ( my $next_path = $fetch->() ) {
# do something with $next_path
}
DESCRIPTION
Iterate through the contents of a given path without having to build
the entire list first.
INTERFACE
Path::Iter::get_iterator()
This returns an code reference that when called returns the next path.
When there are no more (or a directory can't be opened and you have
told it to stop as soon as that happens) it returns false.
It takes one or more paths to process and an optional argument hashref
as the last argument (See "%ARGS")
The paths returned contain the initial argument and its contents (if
any).
Assuming 'foo' in the SYNOPSIS:
is a symlink: you'd iterate through foo
is a file: you'd iterate through foo
is a directory: you'd iterate through foo, foo/bar, foo/wop, foo/bar/baz,
%ARGS
These are all optional.
errors
This is an array of hashref's where any errors get put.
my @err;
my $iter = Path::Iter::get_iterator($path, {errors => \@err});
while(my $next = $iter->()) {
...
}
if (@err) {
... handle error ...
}
The keys for each error in the array are as follows:
'path' => $path,
'function' => 'opendir',
'args' => [\*DIR, $path],
'errno' => int($!),
'error' => int($!) . ": $!",
stop_when_opendir_fails
Boolean, when, if true will short circuit the iteration if an opendir()
call fails.
readdir_handler
A coderef to be used to process and return directory contents (IE
readdir() results)
sub {
my($working_path, @contents) = @_;
if ($working_path eq '.data') {
@contents = grep !/^\.private\-.*/, @contents; # ignore .private-... files in .data/ dir
}
return sort { $a cmp $b } @contents; # return what is left in sorted order
}
The first argument is the directory and the rest is its contents.
The @contents have already had the $working_path prepended.
It should return the contents how you wish them to appear in the
iteration.
symlink_handler
By default syminks are not followed.
This is a coderef that can control how symlinks are handled.
!! IF YOU ALTER THE DEFAULT BEHAVIOR YOU WILL NEED TO CHECK FOR LINK
LOOPS AND INFINITE RECURSION !!
It receives two arguments: the path and a boolean of if it was an
initial argument or not.
If it returns true the path will be followed. If the true value is '2'
it will be tranformed into its target.
!! IF YOU ALTER THE DEFAULT BEHAVIOR YOU WILL NEED TO CHECK FOR LINK
LOOPS AND INFINITE RECURSION !!
Assume we have a link named 'link' whose target is 'path':
sub {
my ($path, $is_initial_arg) = @_;
...
return; # default behavior = link
}
sub {
my ($path, $is_initial_arg) = @_;
...
return 1; # link link/dir link/file link/dir/etc
}
sub {
my ($path, $is_initial_arg) = @_;
...
return 2; # path path/dir path/file path/dir/etc
}
!! IF YOU ALTER THE DEFAULT BEHAVIOR YOU WILL NEED TO CHECK FOR LINK
LOOPS AND INFINITE RECURSION !!
initial
This is a hashref used internally as a lookup of initial args as they
are after any initialization.
DIAGNOSTICS
Throws no warnings or errors of its own. You can catch internal opendir
failures. See "errors" and "stop_when_opendir_fails"
CONFIGURATION AND ENVIRONMENT
Path::Iter requires no configuration files or environment variables.
DEPENDENCIES
File::Spec
INCOMPATIBILITIES
None reported.
BUGS AND LIMITATIONS
No bugs have been reported.
Please report any bugs or feature requests to
"bug-path-iter@rt.cpan.org", or through the web interface at
<http://rt.cpan.org>.
AUTHOR
Daniel Muey "<http://drmuey.com/cpan_contact.pl>"
LICENCE AND COPYRIGHT
Copyright (c) 2008, Daniel Muey "<http://drmuey.com/cpan_contact.pl>".
All rights reserved.
This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself. See perlartistic.
DISCLAIMER OF WARRANTY
BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT
WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER
PARTIES PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH
YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
NECESSARY SERVICING, REPAIR, OR CORRECTION.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE LIABLE
TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES.
perl v5.24.3 2008-11-24 Path::Iter(3)
path-iter 0.200.0 - Generated Fri Jan 5 08:21:26 CST 2018