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FileFinder.php
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Sun, Feb 23, 05:10

FileFinder.php
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<?php
/**
* Find files on disk matching criteria, like the 'find' system utility. Use of
* this class is straightforward:
*
* // Find PHP files in /tmp
* $files = id(new FileFinder('/tmp'))
* ->withType('f')
* ->withSuffix('php')
* ->find();
*
* @task create Creating a File Query
* @task config Configuring File Queries
* @task exec Executing the File Query
* @task internal Internal
* @group filesystem
*/
final class FileFinder {
private $root;
private $exclude = array();
private $paths = array();
private $suffix = array();
private $type;
private $generateChecksums = false;
private $followSymlinks;
/**
* Create a new FileFinder.
*
* @param string Root directory to find files beneath.
* @return this
* @task create
*/
public function __construct($root) {
$this->root = $root;
}
/**
* @task config
*/
public function excludePath($path) {
$this->exclude[] = $path;
return $this;
}
/**
* @task config
*/
public function withSuffix($suffix) {
$this->suffix[] = '*.'.$suffix;
return $this;
}
/**
* @task config
*/
public function withPath($path) {
$this->paths[] = $path;
return $this;
}
/**
* @task config
*/
public function withType($type) {
$this->type = $type;
return $this;
}
/**
* @task config
*/
public function withFollowSymlinks($follow) {
$this->followSymlinks = $follow;
return $this;
}
/**
* @task config
*/
public function setGenerateChecksums($generate) {
$this->generateChecksums = $generate;
return $this;
}
/**
* @task exec
*/
public function find() {
$args = array();
$command = array();
$command[] = '(cd %s; ';
$args[] = $this->root;
$command[] = 'find';
if ($this->followSymlinks) {
$command[] = '-L';
}
$command[] = '.';
if ($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));
$stdout = trim($stdout);
if (!strlen($stdout)) {
return array();
}
if (!$this->generateChecksums) {
return explode("\0", $stdout);
} else {
$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 $map;
}
}
/**
* @task internal
*/
private function generateList($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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