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<?php
/**
* A file output class that only overwrites files on content changes
*
* PHP versions 5
*
* LICENSE: This source file is subject to version 3.0 of the PHP license
* that is available through the world-wide-web at the following URI:
* http://www.php.net/license/3_0.txt. If you did not receive a copy of
* the PHP License and are unable to obtain it through the web, please
* send a note to license@php.net so we can mail you a copy immediately.
*
* @category Tools and Utilities
* @package CodeGen
* @author Hartmut Holzgraefe <hartmut@php.net>
* @copyright 2005 Hartmut Holzgraefe
* @license http://www.php.net/license/3_0.txt PHP License 3.0
* @version CVS: $Id: FileReplacer.php,v 1.2 2005/08/14 16:47:59 hholzgra Exp $
* @link http://pear.php.net/package/CodeGen
*/
/**
* A file output class that only overwrites files on content changes
*
* File output is first collected in a temporary file,
* after the output is finished the temporary file is compared
* to the previous file (by size and md5 checksum), only when
* changes are detected the file is replaced, else the old
* version is kept and the temporary file removed. This way
* unchanged files keep their old modification date which
* improves "make" build times
*
* @category Tools and Utilities
* @package CodeGen
* @author Hartmut Holzgraefe <hartmut@php.net>
* @copyright 2005 Hartmut Holzgraefe
* @license http://www.php.net/license/3_0.txt PHP License 3.0
* @version Release: @package_version@
* @link http://pear.php.net/package/CodeGen
*/
class CodeGen_Tools_FileReplacer
{
/**
* output filename
*
* @var string
*/
protected $fileName;
/**
* temporary filename
*
* @var string
*/
protected $tempName;
/**
* temporary file handle
*
* @var resource
*/
protected $fp;
/**
* Constructor
*
* @param string target filename
*/
function __construct($fileName)
{
$this->fileName = $fileName;
$this->tempName = tempnam(dirname($fileName), "~tmp");
$this->fp = fopen($this->tempName, "w");
}
/**
* Write text to file
*
* @param string output text
* @return int number of characters written
*/
function puts($string)
{
return fputs($this->fp, $string);
}
/**
* Do final output, replace original file on changes
*
* @return bool success status
*/
function close()
{
fclose($this->fp);
if ( !file_exists($this->fileName)
|| (@filesize($this->fileName) != @filesize($this->tempName))
|| (md5(@file_get_contents($this->fileName)) != md5(file_get_contents($this->tempName)))) {
if (file_exists($this->fileName)) {
@rename($this->fileName, $this->fileName.".bak");
}
if (!@rename($this->tempName, $this->fileName)) {
unlink($this->tempName);
return PEAR::raiseError("Can't write output file '{$this->fileName}'");
}
} else {
unlink($this->tempName);
}
return true;
}
}
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