File: //usr/local/ssl/local/share/man/man3/File::Find::Rule.3
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.\" ========================================================================
.\"
.IX Title "File::Find::Rule 3"
.TH File::Find::Rule 3 "2011-09-19" "perl v5.8.8" "User Contributed Perl Documentation"
.SH "NAME"
File::Find::Rule \- Alternative interface to File::Find
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\& use File::Find::Rule;
\& # find all the subdirectories of a given directory
\& my @subdirs = File::Find::Rule->directory->in( $directory );
.Ve
.PP
.Vb 4
\& # find all the .pm files in @INC
\& my @files = File::Find::Rule->file()
\& ->name( '*.pm' )
\& ->in( @INC );
.Ve
.PP
.Vb 5
\& # as above, but without method chaining
\& my $rule = File::Find::Rule->new;
\& $rule->file;
\& $rule->name( '*.pm' );
\& my @files = $rule->in( @INC );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
File::Find::Rule is a friendlier interface to File::Find. It allows
you to build rules which specify the desired files and directories.
.SH "METHODS"
.IX Header "METHODS"
.ie n .IP """new""" 4
.el .IP "\f(CWnew\fR" 4
.IX Item "new"
A constructor. You need not invoke \f(CW\*(C`new\*(C'\fR manually unless you wish
to, as each of the rule-making methods will auto-create a suitable
object if called as class methods.
.Sh "Matching Rules"
.IX Subsection "Matching Rules"
.ie n .IP """name( @patterns )""" 4
.el .IP "\f(CWname( @patterns )\fR" 4
.IX Item "name( @patterns )"
Specifies names that should match. May be globs or regular
expressions.
.Sp
.Vb 3
\& $set->name( '*.mp3', '*.ogg' ); # mp3s or oggs
\& $set->name( qr/\e.(mp3|ogg)$/ ); # the same as a regex
\& $set->name( 'foo.bar' ); # just things named foo.bar
.Ve
.IP "\-X tests" 4
.IX Item "-X tests"
Synonyms are provided for each of the \-X tests. See \*(L"\-X\*(R" in perlfunc for
details. None of these methods take arguments.
.Sp
.Vb 19
\& Test | Method Test | Method
\& ------|------------- ------|----------------
\& -r | readable -R | r_readable
\& -w | writeable -W | r_writeable
\& -w | writable -W | r_writable
\& -x | executable -X | r_executable
\& -o | owned -O | r_owned
\& | |
\& -e | exists -f | file
\& -z | empty -d | directory
\& -s | nonempty -l | symlink
\& | -p | fifo
\& -u | setuid -S | socket
\& -g | setgid -b | block
\& -k | sticky -c | character
\& | -t | tty
\& -M | modified |
\& -A | accessed -T | ascii
\& -C | changed -B | binary
.Ve
.Sp
Though some tests are fairly meaningless as binary flags (\f(CW\*(C`modified\*(C'\fR,
\&\f(CW\*(C`accessed\*(C'\fR, \f(CW\*(C`changed\*(C'\fR), they have been included for completeness.
.Sp
.Vb 3
\& # find nonempty files
\& $rule->file,
\& ->nonempty;
.Ve
.IP "stat tests" 4
.IX Item "stat tests"
The following \f(CW\*(C`stat\*(C'\fR based methods are provided: \f(CW\*(C`dev\*(C'\fR, \f(CW\*(C`ino\*(C'\fR,
\&\f(CW\*(C`mode\*(C'\fR, \f(CW\*(C`nlink\*(C'\fR, \f(CW\*(C`uid\*(C'\fR, \f(CW\*(C`gid\*(C'\fR, \f(CW\*(C`rdev\*(C'\fR, \f(CW\*(C`size\*(C'\fR, \f(CW\*(C`atime\*(C'\fR,
\&\f(CW\*(C`mtime\*(C'\fR, \f(CW\*(C`ctime\*(C'\fR, \f(CW\*(C`blksize\*(C'\fR, and \f(CW\*(C`blocks\*(C'\fR. See \*(L"stat\*(R" in perlfunc
for details.
.Sp
Each of these can take a number of targets, which will follow
Number::Compare semantics.
.Sp
.Vb 5
\& $rule->size( 7 ); # exactly 7
\& $rule->size( ">7Ki" ); # larger than 7 * 1024 * 1024 bytes
\& $rule->size( ">=7" )
\& ->size( "<=90" ); # between 7 and 90, inclusive
\& $rule->size( 7, 9, 42 ); # 7, 9 or 42
.Ve
.ie n .IP """any( @rules )""" 4
.el .IP "\f(CWany( @rules )\fR" 4
.IX Item "any( @rules )"
.PD 0
.ie n .IP """or( @rules )""" 4
.el .IP "\f(CWor( @rules )\fR" 4
.IX Item "or( @rules )"
.PD
Allows shortcircuiting boolean evaluation as an alternative to the
default and-like nature of combined rules. \f(CW\*(C`any\*(C'\fR and \f(CW\*(C`or\*(C'\fR are
interchangeable.
.Sp
.Vb 5
\& # find avis, movs, things over 200M and empty files
\& $rule->any( File::Find::Rule->name( '*.avi', '*.mov' ),
\& File::Find::Rule->size( '>200M' ),
\& File::Find::Rule->file->empty,
\& );
.Ve
.ie n .IP """none( @rules )""" 4
.el .IP "\f(CWnone( @rules )\fR" 4
.IX Item "none( @rules )"
.PD 0
.ie n .IP """not( @rules )""" 4
.el .IP "\f(CWnot( @rules )\fR" 4
.IX Item "not( @rules )"
.PD
Negates a rule. (The inverse of \f(CW\*(C`any\*(C'\fR.) \f(CW\*(C`none\*(C'\fR and \f(CW\*(C`not\*(C'\fR are
interchangeable.
.Sp
.Vb 3
\& # files that aren't 8.3 safe
\& $rule->file
\& ->not( $rule->new->name( qr/^[^.]{1,8}(\e.[^.]{0,3})?$/ ) );
.Ve
.ie n .IP """prune""" 4
.el .IP "\f(CWprune\fR" 4
.IX Item "prune"
Traverse no further. This rule always matches.
.ie n .IP """discard""" 4
.el .IP "\f(CWdiscard\fR" 4
.IX Item "discard"
Don't keep this file. This rule always matches.
.ie n .IP """exec( \e&subroutine( $shortname, $path, $fullname ) )""" 4
.el .IP "\f(CWexec( \e&subroutine( $shortname, $path, $fullname ) )\fR" 4
.IX Item "exec( &subroutine( $shortname, $path, $fullname ) )"
Allows user-defined rules. Your subroutine will be invoked with \f(CW$_\fR
set to the current short name, and with parameters of the name, the
path you're in, and the full relative filename.
.Sp
Return a true value if your rule matched.
.Sp
.Vb 2
\& # get things with long names
\& $rules->exec( sub { length > 20 } );
.Ve
.ie n .IP """grep( @specifiers )""" 4
.el .IP "\f(CWgrep( @specifiers )\fR" 4
.IX Item "grep( @specifiers )"
Opens a file and tests it each line at a time.
.Sp
For each line it evaluates each of the specifiers, stopping at the
first successful match. A specifier may be a regular expression or a
subroutine. The subroutine will be invoked with the same parameters
as an \->exec subroutine.
.Sp
It is possible to provide a set of negative specifiers by enclosing
them in anonymous arrays. Should a negative specifier match the
iteration is aborted and the clause is failed. For example:
.Sp
.Vb 1
\& $rule->grep( qr/^#!.*\ebperl/, [ sub { 1 } ] );
.Ve
.Sp
Is a passing clause if the first line of a file looks like a perl
shebang line.
.ie n .IP """maxdepth( $level )""" 4
.el .IP "\f(CWmaxdepth( $level )\fR" 4
.IX Item "maxdepth( $level )"
Descend at most \f(CW$level\fR (a non-negative integer) levels of directories
below the starting point.
.Sp
May be invoked many times per rule, but only the most recent value is
used.
.ie n .IP """mindepth( $level )""" 4
.el .IP "\f(CWmindepth( $level )\fR" 4
.IX Item "mindepth( $level )"
Do not apply any tests at levels less than \f(CW$level\fR (a non-negative
integer).
.ie n .IP """extras( \e%extras )""" 4
.el .IP "\f(CWextras( \e%extras )\fR" 4
.IX Item "extras( %extras )"
Specifies extra values to pass through to \f(CW\*(C`File::File::find\*(C'\fR as part
of the options hash.
.Sp
For example this allows you to specify following of symlinks like so:
.Sp
.Vb 1
\& my $rule = File::Find::Rule->extras({ follow => 1 });
.Ve
.Sp
May be invoked many times per rule, but only the most recent value is
used.
.ie n .IP """relative""" 4
.el .IP "\f(CWrelative\fR" 4
.IX Item "relative"
Trim the leading portion of any path found
.ie n .IP """not_*""" 4
.el .IP "\f(CWnot_*\fR" 4
.IX Item "not_*"
Negated version of the rule. An effective shortand related to ! in
the procedural interface.
.Sp
.Vb 1
\& $foo->not_name('*.pl');
.Ve
.Sp
.Vb 1
\& $foo->not( $foo->new->name('*.pl' ) );
.Ve
.Sh "Query Methods"
.IX Subsection "Query Methods"
.ie n .IP """in( @directories )""" 4
.el .IP "\f(CWin( @directories )\fR" 4
.IX Item "in( @directories )"
Evaluates the rule, returns a list of paths to matching files and
directories.
.ie n .IP """start( @directories )""" 4
.el .IP "\f(CWstart( @directories )\fR" 4
.IX Item "start( @directories )"
Starts a find across the specified directories. Matching items may
then be queried using \*(L"match\*(R". This allows you to use a rule as an
iterator.
.Sp
.Vb 4
\& my $rule = File::Find::Rule->file->name("*.jpeg")->start( "/web" );
\& while ( defined ( my $image = $rule->match ) ) {
\& ...
\& }
.Ve
.ie n .IP """match""" 4
.el .IP "\f(CWmatch\fR" 4
.IX Item "match"
Returns the next file which matches, false if there are no more.
.Sh "Extensions"
.IX Subsection "Extensions"
Extension modules are available from \s-1CPAN\s0 in the File::Find::Rule
namespace. In order to use these extensions either use them directly:
.PP
.Vb 2
\& use File::Find::Rule::ImageSize;
\& use File::Find::Rule::MMagic;
.Ve
.PP
.Vb 2
\& # now your rules can use the clauses supplied by the ImageSize and
\& # MMagic extension
.Ve
.PP
or, specify that File::Find::Rule should load them for you:
.PP
.Vb 1
\& use File::Find::Rule qw( :ImageSize :MMagic );
.Ve
.PP
For notes on implementing your own extensions, consult
File::Find::Rule::Extending
.Sh "Further examples"
.IX Subsection "Further examples"
.IP "Finding perl scripts" 4
.IX Item "Finding perl scripts"
.Vb 13
\& my $finder = File::Find::Rule->or
\& (
\& File::Find::Rule->name( '*.pl' ),
\& File::Find::Rule->exec(
\& sub {
\& if (open my $fh, $_) {
\& my $shebang = <$fh>;
\& close $fh;
\& return $shebang =~ /^#!.*\ebperl/;
\& }
\& return 0;
\& } ),
\& );
.Ve
.Sp
Based upon this message http://use.perl.org/comments.pl?sid=7052&cid=10842
.IP "ignore \s-1CVS\s0 directories" 4
.IX Item "ignore CVS directories"
.Vb 7
\& my $rule = File::Find::Rule->new;
\& $rule->or($rule->new
\& ->directory
\& ->name('CVS')
\& ->prune
\& ->discard,
\& $rule->new);
.Ve
.Sp
Note here the use of a null rule. Null rules match anything they see,
so the effect is to match (and discard) directories called '\s-1CVS\s0' or to
match anything.
.SH "TWO FOR THE PRICE OF ONE"
.IX Header "TWO FOR THE PRICE OF ONE"
File::Find::Rule also gives you a procedural interface. This is
documented in File::Find::Rule::Procedural
.SH "EXPORTS"
.IX Header "EXPORTS"
\&\*(L"find\*(R", \*(L"rule\*(R"
.SH "TAINT MODE INTERACTION"
.IX Header "TAINT MODE INTERACTION"
As of 0.32 File::Find::Rule doesn't capture the current working directory in
a taint-unsafe manner. File::Find itself still does operations that the taint
system will flag as insecure but you can use the \*(L"extras\*(R" feature to ask
File::Find to internally \f(CW\*(C`untaint\*(C'\fR file paths with a regex like so:
.PP
.Vb 1
\& my $rule = File::Find::Rule->extras({ untaint => 1 });
.Ve
.PP
Please consult File::Find's documentation for \f(CW\*(C`untaint\*(C'\fR,
\&\f(CW\*(C`untaint_pattern\*(C'\fR, and \f(CW\*(C`untaint_skip\*(C'\fR for more information.
.SH "BUGS"
.IX Header "BUGS"
The code makes use of the \f(CW\*(C`our\*(C'\fR keyword and as such requires perl version
5.6.0 or newer.
.PP
Currently it isn't possible to remove a clause from a rule object. If
this becomes a significant issue it will be addressed.
.SH "AUTHOR"
.IX Header "AUTHOR"
Richard Clamp <richardc@unixbeard.net> with input gained from this
use.perl discussion: http://use.perl.org/~richardc/journal/6467
.PP
Additional proofreading and input provided by Kake, Greg McCarroll,
and Andy Lester andy@petdance.com.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (C) 2002, 2003, 2004, 2006, 2009, 2011 Richard Clamp. All Rights Reserved.
.PP
This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
File::Find, Text::Glob, Number::Compare, \fIfind\fR\|(1)
.PP
If you want to know about the procedural interface, see
File::Find::Rule::Procedural, and if you have an idea for a neat
extension File::Find::Rule::Extending