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package File::Find;
require 5.000;
require Exporter;
require Cwd;
=head1 NAME
find - traverse a file tree
finddepth - traverse a directory structure depth-first
=head1 SYNOPSIS
use File::Find;
find(\&wanted, '/foo','/bar');
sub wanted { ... }
use File::Find;
finddepth(\&wanted, '/foo','/bar');
sub wanted { ... }
=head1 DESCRIPTION
The first argument to find() is either a hash reference describing the
operations to be performed for each file, a code reference, or a string
that contains a subroutine name. If it is a hash reference, then the
value for the key C<wanted> should be a code reference. This code
reference is called I<the wanted() function> below.
Currently the only other supported key for the above hash is
C<bydepth>, in presense of which the walk over directories is
performed depth-first. Entry point finddepth() is a shortcut for
specifying C<{ bydepth => 1}> in the first argument of find().
The wanted() function does whatever verifications you want.
$File::Find::dir contains the current directory name, and $_ the
current filename within that directory. $File::Find::name contains
C<"$File::Find::dir/$_">. You are chdir()'d to $File::Find::dir when
the function is called. The function may set $File::Find::prune to
prune the tree.
File::Find assumes that you don't alter the $_ variable. If you do then
make sure you return it to its original value before exiting your function.
This library is useful for the C<find2perl> tool, which when fed,
find2perl / -name .nfs\* -mtime +7 \
-exec rm -f {} \; -o -fstype nfs -prune
produces something like:
sub wanted {
/^\.nfs.*$/ &&
(($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_)) &&
int(-M _) > 7 &&
unlink($_)
||
($nlink || (($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_))) &&
$dev < 0 &&
($File::Find::prune = 1);
}
Set the variable $File::Find::dont_use_nlink if you're using AFS,
since AFS cheats.
C<finddepth> is just like C<find>, except that it does a depth-first
search.
Here's another interesting wanted function. It will find all symlinks
that don't resolve:
sub wanted {
-l && !-e && print "bogus link: $File::Find::name\n";
}
=head1 BUGS
There is no way to make find or finddepth follow symlinks.
=cut
@ISA = qw(Exporter);
@EXPORT = qw(find finddepth);
sub find_opt {
my $wanted = shift;
my $bydepth = $wanted->{bydepth};
my $cwd = $bydepth ? Cwd::fastcwd() : Cwd::cwd();
# Localize these rather than lexicalizing them for backwards
# compatibility.
local($topdir,$topdev,$topino,$topmode,$topnlink);
foreach $topdir (@_) {
(($topdev,$topino,$topmode,$topnlink) =
($Is_VMS ? stat($topdir) : lstat($topdir)))
|| (warn("Can't stat $topdir: $!\n"), next);
if (-d _) {
if (chdir($topdir)) {
$prune = 0;
unless ($bydepth) {
($dir,$_) = ($topdir,'.');
$name = $topdir;
$wanted->{wanted}->();
}
next if $prune;
my $fixtopdir = $topdir;
$fixtopdir =~ s,/$,, ;
$fixtopdir =~ s/\.dir$// if $Is_VMS;
&finddir($wanted,$fixtopdir,$topnlink, $bydepth);
if ($bydepth) {
($dir,$_) = ($fixtopdir,'.');
$name = $fixtopdir;
$wanted->{wanted}->();
}
}
else {
warn "Can't cd to $topdir: $!\n";
}
}
else {
require File::Basename;
unless (($_,$dir) = File::Basename::fileparse($topdir)) {
($dir,$_) = ('.', $topdir);
}
if (chdir($dir)) {
$name = $topdir;
$wanted->{wanted}->();
}
else {
warn "Can't cd to $dir: $!\n";
}
}
}
continue {
chdir $cwd;
}
}
sub finddir {
my($wanted, $nlink, $bydepth);
local($dir, $name);
($wanted, $dir, $nlink, $bydepth) = @_;
my($dev, $ino, $mode, $subcount);
# Get the list of files in the current directory.
opendir(DIR,'.') || (warn("Can't open $dir: $!\n"), $bydepth || return);
my(@filenames) = readdir(DIR);
closedir(DIR);
if ($nlink == 2 && !$dont_use_nlink) { # This dir has no subdirectories.
for (@filenames) {
next if $_ eq '.';
next if $_ eq '..';
$name = "$dir/$_";
$nlink = 0;
$wanted->{wanted}->();
}
}
else { # This dir has subdirectories.
$subcount = $nlink - 2;
for (@filenames) {
next if $_ eq '.';
next if $_ eq '..';
$nlink = 0;
$prune = 0 unless $bydepth;
$name = "$dir/$_";
$wanted->{wanted}->() unless $bydepth;
if ($subcount > 0 || $dont_use_nlink) { # Seen all the subdirs?
# Get link count and check for directoriness.
$_ = "" if (!defined($_));
($dev,$ino,$mode,$nlink) = ($Is_VMS ? stat($_) : lstat($_));
# unless ($nlink || $dont_use_nlink);
if (-d _) {
# It really is a directory, so do it recursively.
--$subcount;
next if $prune;
if (chdir $_) {
$name =~ s/\.dir$// if $Is_VMS;
&finddir($wanted,$name,$nlink, $bydepth);
chdir '..';
}
else {
warn "Can't cd to $_: $!\n";
}
}
}
$wanted->{wanted}->() if $bydepth;
}
}
}
sub wrap_wanted {
my $wanted = shift;
ref($wanted) eq 'HASH' ? $wanted : { wanted => $wanted };
}
sub find {
my $wanted = shift;
find_opt(wrap_wanted($wanted), @_);
}
sub finddepth {
my $wanted = wrap_wanted(shift);
$wanted->{bydepth} = 1;
find_opt($wanted, @_);
}
# These are hard-coded for now, but may move to hint files.
if ($^O eq 'VMS') {
$Is_VMS = 1;
$dont_use_nlink = 1;
}
$dont_use_nlink = 1
if $^O eq 'os2' || $^O eq 'dos' || $^O eq 'amigaos' || $^O eq 'MSWin32';
# Set dont_use_nlink in your hint file if your system's stat doesn't
# report the number of links in a directory as an indication
# of the number of files.
# See, e.g. hints/machten.sh for MachTen 2.2.
unless ($dont_use_nlink) {
require Config;
$dont_use_nlink = 1 if ($Config::Config{'dont_use_nlink'});
}
1;
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