mass-rename/mass-rename.php

<?php

//	Copyright (c) 2020 DBMXPCA Technologies. All rights reserved.
//	www.dbmxpca.com
//	Date Created: May 18, 2020
//	Last Updated: May 19, 2020
//	     Version: 1.03

//	====================================================================================
//	--- SETTINGS --- SETTINGS --- SETTINGS --- SETTINGS --- SETTINGS --- SETTINGS ---
//	====================================================================================

//	If true, the script will search for all possible occurrences of itself
//	and remove it from the directory traversal so as to prevent any alter-
//	ations to the script itself. This can be useful but for larger dir-
//	ectory traversals can consume a significant amount of time. It is rec-
//	ommended that this is enabled only for small datasets or if time is
//	not of significant concern.
$remove_self = false;

//	If true, the script will show a preview of all discovered files and dir-
//	ectories. See the setting "$max_preview_size" for maximum preview results.
$enable_dir_scan_preview = true;

//	If true, the script will spew the full command immediately prior to its
//	execution during the final renaming process.
$display_full_cmd = true;

//	If true, the script will spew the progress during the rename operation.
$display_progress = true;

//	If true, directories will be skipped and thus will not be renamed.
$skip_directories = true;

//	Maximum results per preview.
$max_preview_size = 100;

//	Number of characters to limit the full path & file command preview. This
//	must be a negative number in order to display the last N characters.
$cmd_display_limit = -32;



//	====================================================================================
//	+++++++++++ DO NOT EDIT BEYOND THIS POINT +++++++++++ DO NOT EDIT BEYOND THIS POINT
//	====================================================================================


$dirToTraverse = -1;
$regex_search = "";
$replace_str = "";
$thisFile = __DIR__ . "/" . $argv[0];

function GET_DIR_CONTENTS($dir, &$results = array()) {
    $files = scandir($dir);

    foreach ($files as $key => $value) {
        $path = realpath($dir . DIRECTORY_SEPARATOR . $value);
        if (!is_dir($path)) {
            $results[] = $path;
        } else if ($value != "." && $value != "..") {
            GET_DIR_CONTENTS($path, $results);
            $results[] = $path;
        }
    }

    return $results;
}

function ECHO_USAGE(){
	
	global $argv;
	
	echo "\n > Usage:\n";
	echo "    \"php " . $argv[0] . " <t-dir> <search-regex> <replace-str>\"\n";
	echo "       where <t-dir> is the directory to traverse and\n";
	echo "       <search-regex> is the regular expression to\n";
	echo "       search for, and <replace-str> is the raw string\n";
	echo "       to replace the search-regex with. Note that\n";
	echo "       <replace-str> is NOT a regular expression.\n";
	echo "       If <replace-str> contains one or more whitespace\n";
	echo "       character(s), it must be enclosed within double-\n";
	echo "       quotation marks.\n";
	
	echo "\n > Examples:\n";
	echo "   > \"php " . $argv[0] . " . /.[a-z]+/ .jpg\"\n";
	echo "   > \"php " . $argv[0] . " . /.[a-zA-Z]+/ .jpg\"\n";
	echo "   > \"php " . $argv[0] . " . /.[a-zA-Z0-9]+/ \".jpg\"\"\n";
	
}

//	@BRIEF		Replace $search with $replace in $str. This performs a simple replace using PHP's str_replace().
function REPLACE($str, $search, $replace){
	
	return str_replace($search, $replace, $str);
}

//	@BRIEF		Replace $search with $replace in $str. This expects a regular expression for $search and uses PHP's preg_replace().
function REPLACE2($str, $search, $replace){
	
	return preg_replace($search, $replace, $str);
}

//	Returns true if both strings are the same. Performs a case-insensitive comparison unless third parameter is true.
function ARE_STRINGS_EQUAL($str1, $str2, $case_sensitive = false){
	
	switch($case_sensitive){
		case true:
			if (strcmp($str1, $str2) == 0){
				return true;
			}
			else{
				return false;
			}
			break;
		default:
			if (strcasecmp($str1, $str2) == 0){
				return true;
			}
			else{
				return false;
			}
			break;
	}
	return false;	
}

//	======================================================================

if (isset($argv[1])){
	
	$dirToTraverse = $argv[1];
	echo " > Check passed; Traversal Directory = [" . $dirToTraverse . "]\n";
}

else{
	
	echo " > Check FAILED; Missing Traversal Directory!\n";
	
	ECHO_USAGE();
	
	echo "\n > Script terminated.\n";
	exit(1);
}

if (isset($argv[2])){
	
	$regex_search = $argv[2];
	echo " > Check passed; Search RegEx = \"" . $regex_search . "\"\n";
}

else{
	
	echo " > Check FAILED; Missing Search RegEx!\n";
	
	ECHO_USAGE();
	
	echo "\n > Script terminated.\n";
	exit(1);
}

if (isset($argv[3])){
	
	$replace_str = $argv[3];
	echo " > Check passed; Replacement String = \"" . $replace_str . "\"\n";
}

else{
	
	echo " > Check FAILED; Missing Search RegEx!\n";
	
	ECHO_USAGE();
	
	echo "\n > Script terminated.\n";
	exit(1);
}

echo " > Performing initial directory traversal, please wait...\n";

$contents = array();
GET_DIR_CONTENTS($dirToTraverse, $contents);

if ($remove_self){
	
	while( ($found = array_search($thisFile, $contents)) !== false ){
		
		echo " > Removing this script from file listing.\n";
		unset($contents[$found]);
	}
}

// var_dump($contents);

echo " > Initial directory traversal complete.\n";

$counter = 0;
$stop_preview = false;

if ($enable_dir_scan_preview){

	echo " > ORIGINAL FILE AND DIRECTORY PREVIEW:\n ================================\n";
	foreach ($contents as $c){
		
		if ($stop_preview)
			break;
		$counter++;
		
		if ($counter > $max_preview_size){
			
			echo " --------- (results truncated)\n";
			$stop_preview = true;
			break;
		}
		
		echo "   " . $c . "\n";
	}

	echo " ================================\n";
}

$content_map = array();
$content_map_new = array();

//	Build a content map: array with path => filename format.
foreach ($contents as $c){
	
	if (is_dir($c))
		$filename = null;
	else
		$filename = basename($c);
	
	$content_map[$c] = $filename;
}

$content_map_new = $content_map;

// print_r($content_map);
//	Build the replacement content map. This contains the same path => filename
//	format but with the updated filename instead of the original.
foreach ($content_map_new as $p => $f){
	
	// REPLACE2($str, $search, $replace)
	$filename_new = REPLACE2($f, $regex_search, $replace_str);
	$path_new = REPLACE2($p, $regex_search, $replace_str);
	$content_map_new[$p] = $filename_new;
}

echo " > New content map created. See below for preview.\n";

echo " > FILE AND DIRECTORY PREVIEW:\n ================================\n";


$counter = 0;
$stop_preview = false;

foreach ($content_map as $p => $f){
	
	if ($stop_preview)
		break;
	
	if (!is_dir($p)){
		
		$counter++;
		
		if ($counter > $max_preview_size){
			
			echo " --------- (results truncated)\n";
			$stop_preview = true;
			break;
		}
		
		$new_path = dirname($p) . "/" . $content_map_new[$p];
		echo " [before]: " . $p . "\n";
		echo "  [after]: " . $new_path . "\n\n";
		
	}
	
}


echo " *** Please review above results carefully ***\n\n";
echo "  - To begin operation (cannot be undone), type 'Y' and press ENTER/RETURN.\n";
// echo " - To preview more results, type 'P'  and press ENTER/RETURN.\n";
echo "  - To cancel script without making any changes, type 'N' and press ENTER/RETURN.\n";
echo "\n  >> Begin operation? [Y/n]: ";
$response = fgets(STDIN);
$begin_operation = substr($response, 0, strlen($response) - 1);

if (ARE_STRINGS_EQUAL($begin_operation, "Y", true)){
	
	echo "\n  > Operation started by user.\n";
	$countdown_timer = 5;
	while($countdown_timer > 0){
		
		echo "  > Operation starting in " . $countdown_timer . " second(s)...\n";
		$countdown_timer--;
		sleep(1);
	}
	
	echo "\n  > Operation in progress, please wait...\n";
	
	$total_items = count($content_map) + 1;
	$items_remaining = $total_items;
	$curr_item = 0;
	$progress_val = 0;
	foreach ($content_map as $p => $f){
		
		$curr_item++;
		$progress_val = $curr_item / $total_items;
		$progress_val *= 100;
		$progress_val_d = number_format((float)$progress_val, 2, '.', '');
		
		//	TODO: Only perform this check if skip_directories is TRUE.
		if (!is_dir($p)){
			
			
			$new_path = dirname($p) . "/" . $content_map_new[$p];
			//	Actual command to be executed.
			$cmd = "mv \"" . $p . "\" \"" . $new_path . "\"";
			//	Truncated command to be displayed.
			$cmd_d = "-";
			//	Make sure the strings are actually long enough to get truncated. If either are too short,
			//	then just display the full command.
			if (strlen($p) >= -$cmd_display_limit && strlen($new_path) >= -$cmd_display_limit){
				$cmd_d = "mv \"..." . substr($p, $cmd_display_limit) . "\" \"..." . substr($new_path, $cmd_display_limit) . "\"";
			}
			else{
				$cmd_d = $cmd;
			}
			
			if (!$display_progress && !$display_full_cmd){		//00
				//	print nothing
			}
			else if (!$display_progress && $display_full_cmd){	//01
				echo " >>> [" . $cmd_d . "]\n";
			}
			else if ($display_progress && !$display_full_cmd){	//10
				echo " >>> [Progress:  " . $progress_val_d . "%  (" . $curr_item . "/" . $total_items . ") | Items Remaining: " . $items_remaining . "]\n";
			}
			else if ($display_progress && $display_full_cmd){	//11
				echo " >>> [Progress: " . $progress_val_d . "% (" . $curr_item . "/" . $total_items . ") | Remaining: " . $items_remaining . "] | [" . $cmd_d . "]\n";
			}
			
			exec($cmd);
		}
		
		$items_remaining--;
		
	}	
	
	echo "  > Operation complete.\n";
	exit(0);
	
}

echo "\n  > Operation cancelled by user.\n";
exit(0);