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File::Next.3pm
Langue: en
Version: 2009-08-04 (fedora - 01/12/10)
Section: 3 (Bibliothèques de fonctions)
Sommaire
NAME
File::Next - File-finding iteratorVERSION
Version 1.06SYNOPSIS
File::Next is a lightweight, taint-safe file-finding module. It's lightweight and has no non-core prerequisites.use File::Next; my $files = File::Next::files( '/tmp' ); while ( defined ( my $file = $files->() ) ) { # do something... }
OPERATIONAL THEORY
The two major functions, files() and dirs(), return an iterator that will walk through a directory tree. The simplest use case is:use File::Next; my $iter = File::Next::files( '/tmp' ); while ( defined ( my $file = $iter->() ) ) { print $file, "\n"; } # Prints... /tmp/foo.txt /tmp/bar.pl /tmp/baz/1 /tmp/baz/2.txt /tmp/baz/wango/tango/purple.txt
Note that only files are returned by "files()"'s iterator. Directories are ignored.
In list context, the iterator returns a list containing $dir, $file and $fullpath, where $fullpath is what would get returned in scalar context.
The first parameter to any of the iterator factory functions may be a hashref of options.
ITERATORS
For the three iterators, the \%options are optional.files( [ \%options, ] @starting_points )
Returns an iterator that walks directories starting with the items in @starting_points. Each call to the iterator returns another regular file.dirs( [ \%options, ] @starting_points )
Returns an iterator that walks directories starting with the items in @starting_points. Each call to the iterator returns another directory.everything( [ \%options, ] @starting_points )
Returns an iterator that walks directories starting with the items in @starting_points. Each call to the iterator returns another file, whether it's a regular file, directory, symlink, socket, or whatever.SUPPORT FUNCTIONS
sort_standard( $a, $b )
A sort function for passing as a "sort_files" option:my $iter = File::Next::files( { sort_files => \&File::Next::sort_standard, }, 't/swamp' );
This function is the default, so the code above is identical to:
my $iter = File::Next::files( { sort_files => 1, }, 't/swamp' );
sort_reverse( $a, $b )
Same as "sort_standard", but in reverse.reslash( $path )
Takes a path with all forward slashes and rebuilds it with whatever is appropriate for the platform. For example 'foo/bar/bat' will become 'foo\bar\bat' on Windows.This is really just a convenience function. I'd make it private, but ack wants it, too.
CONSTRUCTOR PARAMETERS
file_filter -> \&file_filter
The file_filter lets you check to see if it's really a file you want to get back. If the file_filter returns a true value, the file will be returned; if false, it will be skipped.The file_filter function takes no arguments but rather does its work through a collection of variables.
- *
- $_ is the current filename within that directory
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- $File::Next::dir is the current directory name
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- $File::Next::name is the complete pathname to the file
These are analogous to the same variables in File::Find.
my $iter = File::Next::files( { file_filter => sub { /\.txt$/ } }, '/tmp' );
By default, the file_filter is "sub {1}", or ``all files''.
This filter has no effect if your iterator is only returning directories.
descend_filter => \&descend_filter
The descend_filter lets you check to see if the iterator should descend into a given directory. Maybe you want to skip CVS and .svn directories.my $descend_filter = sub { $_ ne "CVS" && $_ ne ".svn" }
The descend_filter function takes no arguments but rather does its work through a collection of variables.
- *
- $_ is the current filename of the directory
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- $File::Next::dir is the complete directory name
The descend filter is NOT applied to any directory names specified in as @starting_points in the constructor. For example,
my $iter = File::Next::files( { descend_filter => sub{0} }, '/tmp' );
always descends into /tmp, as you would expect.
By default, the descend_filter is "sub {1}", or ``always descend''.
error_handler => \&error_handler
If error_handler is set, then any errors will be sent through it. By default, this value is "CORE::die".sort_files => [ 0 | 1 | \&sort_sub]
If you want files sorted, pass in some true value, as in "sort_files => 1".If you want a special sort order, pass in a sort function like "sort_files => sub { $a->[1] cmp $b->[1] }". Note that the parms passed in to the sub are arrayrefs, where $a->[0] is the directory name, $a->[1] is the file name and $a->[2] is the full path. Typically you're going to be sorting on $a->[2].
follow_symlinks => [ 0 | 1 ]
If set to false, the iterator will ignore any files and directories that are actually symlinks. This has no effect on non-Unixy systems such as Windows. By default, this is true.Note that this filter does not apply to any of the @starting_points passed in to the constructor.
You should not set "follow_symlinks => 0" unless you specifically need that behavior. Setting "follow_symlinks => 0" can be a speed hit, because File::Next must check to see if the file or directory you're about to follow is actually a symlink.
PRIVATE FUNCTIONS
_setup( $default_parms, @whatever_was_passed_to_files() )
Handles all the scut-work for setting up the parms passed in.Returns a hashref of operational options, combined between $passed_parms and $defaults, plus the queue.
The queue prep stuff takes the strings in @starting_points and puts them in the format that queue needs.
The @queue that gets passed around is an array that has three elements for each of the entries in the queue: $dir, $file and $fullpath. Items must be pushed and popped off the queue three at a time (spliced, really).
_candidate_files( $parms, $dir )
Pulls out the files/dirs that might be worth looking into in $dir. If $dir is the empty string, then search the current directory.$parms is the hashref of parms passed into File::Next constructor.
SPEED TWEAKS
- *
- Don't set "follow_symlinks => 0" unless you need it.
AUTHOR
Andy Lester, "<andy at petdance.com>"BUGS
Please report any bugs or feature requests to http://github.com/petdance/file-next/issues <http://github.com/petdance/file-next/issues>.Note that File::Next does NOT use <http://rt.cpan.org> for bug tracking.
SUPPORT
You can find documentation for this module with the perldoc command.perldoc File::Next
You can also look for information at:
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- File::Next's bug queue
http://github.com/petdance/file-next/issues <http://github.com/petdance/file-next/issues>
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- AnnoCPAN: Annotated CPAN documentation
http://annocpan.org/dist/File-Next <http://annocpan.org/dist/File-Next>
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- CPAN Ratings
http://cpanratings.perl.org/d/File-Next <http://cpanratings.perl.org/d/File-Next>
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- Search CPAN
http://search.cpan.org/dist/File-Next <http://search.cpan.org/dist/File-Next>
- *
- Source code repository
http://github.com/petdance/file-next/tree/master <http://github.com/petdance/file-next/tree/master>
ACKNOWLEDGEMENTS
All file-finding in this module is adapted from Mark Jason Dominus' marvelous Higher Order Perl, page 126.COPYRIGHT & LICENSE
Copyright 2005-2009 Andy Lester.This program is free software; you can redistribute it and/or modify it under the terms of either:
- *
- the GNU General Public License as published by the Free Software Foundation; either version 1, or (at your option) any later version, or
- *
- the Artistic License version 2.0.
Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre