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FileFinder.php
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Fri, Jan 10, 00:54

FileFinder.php
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<?php
/*
* Copyright 2011 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* PHP API for `find`.
*/
class FileFinder {
protected $root;
protected $exclude = array();
protected $paths = array();
protected $suffix = array();
protected $type;
protected $generateChecksums = false;
public function __construct($root) {
$this->root = $root;
}
public function excludePath($path) {
$this->exclude[] = $path;
return $this;
}
public function withSuffix($suffix) {
$this->suffix[] = '*.'.$suffix;
return $this;
}
public function withPath($path) {
$this->paths[] = $path;
return $this;
}
public function withType($type) {
$this->type = $type;
return $this;
}
public function setGenerateChecksums($generate) {
$this->generateChecksums = $generate;
return $this;
}
public function find() {
$args = array();
$command = array();
$command[] = '(cd %s; ';
$args[] = $this->root;
$command[] = 'find .';
if ($this->exclude) {
$command[] = $this->generateList('path', $this->exclude).' -prune';
$command[] = '-o';
}
if ($this->type) {
$command[] = '-type %s';
$args[] = $this->type;
}
if ($this->suffix) {
$command[] = $this->generateList('name', $this->suffix);
}
if ($this->paths) {
$command[] = $this->generateList('wholename', $this->paths);
}
$command[] = '-print0';
if ($this->generateChecksums) {
static $md5sum_binary = null;
if ($md5sum_binary == null) {
$options = array(
'md5sum' => 'md5sum',
'md5' => 'md5 -r',
);
foreach ($options as $bin => $choose) {
list($err) = exec_manual('which %s', $bin);
if ($err == 0) {
$md5sum_binary = $choose;
break;
}
}
if ($md5sum_binary === null) {
throw new Exception(
"Unable to locate the md5/md5sum binary for this system.");
}
}
$command[] = ' | xargs -0 -n512 '.$md5sum_binary;
}
$command[] = ')';
list($stdout) = call_user_func_array(
'execx',
array_merge(
array(implode(' ', $command)),
$args));
if (!$this->generateChecksums) {
return explode("\0", trim($stdout));
} else {
$stdout = trim($stdout);
$map = array();
foreach (explode("\n", $stdout) as $line) {
$file = substr($line, 34);
if ($file == '-') {
continue;
}
// This mess is to make this class work on both mainline Linux systems
// and OSX, which has subtly different 'find' semantics.
$file = $this->root.ltrim($file, '.');
$map[$file] = substr($line, 0, 32);
}
return $map;
}
}
protected function generateList($flag, array $items) {
$items = array_map('escapeshellarg', $items);
foreach ($items as $key => $item) {
$items[$key] = '-'.$flag.' '.$item;
}
$items = implode(' -o ', $items);
return '\\( '.$items.' \\)';
}
}

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