ProcessWire files in folder Fieldtype & Inputfield.

FieldtypeFolder.module

<?php

/**
 * ProcessWire files in folder Fieldtype
 *
 * ©2013 Martijn Geerts
 * 
 * ProcessWire 2.x 
 * Copyright (C) 2010 by Ryan Cramer 
 * Licensed under GNU/GPL v2, see LICENSE.TXT
 * 
 * http://www.processwire.com
 * http://www.ryancramer.com
 *
 */

class FieldtypeFolder extends FieldtypeText {

	public static function getModuleInfo() {
		return array(
			'title' => 'Files in folder',
			'version' => 100,
			'summary' => 'Field that stores a filename from a folder.',
			'installs' => 'InputfieldFolder'
			);
	}

	public function init() {
		parent::init();
		$this->allowTextFormatters(false);
	}

	/**
	 * Sanitize value for storage
	 *
	 */
	 
	public function sanitizeValue(Page $page, Field $field, $value) {
		$folder = trim($field->folderPath);
		$file = $this->config->paths->templates . trim($field->folderPath, "/") . "/" . $value;	
		// not linked
		if(!is_file($file)) return '';
		// don't allow directories
		if(is_dir($file)) return '';
		return $value;
	}
	
	// Sets folderPath to the inputfield
	public function getInputfield(Page $page, Field $field) {
		$inputfield = $this->modules->get('InputfieldFolder'); 
		$inputfield->set('folderPath', $field->folderPath); 
		return $inputfield; 
	}

	// clean it
	public function ___formatValue(Page $page, Field $field, $value) {	
		return trim($value, "/"); 
	}

	// details
	public function ___getConfigInputfields(Field $field) {
		$inputfields = parent::___getConfigInputfields($field);

		$f = $this->modules->get('InputfieldText');
		$f->attr('name', 'folderPath');
		$f->label = __("Path to files");
		$f->attr('value', $field->folderPath);
		$f->description = 'Relative to the templates folder.';
		$f->notes = 'If the files are located in /site/templates/scripts/, type: scripts/';
		$inputfields->add($f);

		return $inputfields;
	}
}

InputfieldFolder.module

<?php

/**
 * An Inputfield for handling files in a folder
 *
 * ©2013 Martijn Geerts
 * 
 * ProcessWire 2.x 
 * Copyright (C) 2010 by Ryan Cramer 
 * Licensed under GNU/GPL v2, see LICENSE.TXT
 * 
 * http://www.processwire.com
 * http://www.ryancramer.com
 *
 */
class InputfieldFolder extends InputfieldText {

	public static function getModuleInfo() {
		return array(
			'title' => 'Files in folder',
			'version' => 100,
			'summary' => 'Inputfield select to select a filename from a folder.',
			'requires' => 'FieldtypeFolder'
			);
	}

	public function __construct() {
		parent::__construct();
	}

	public function ___render() {

		$value = $this->attr('value');
		$name = $this->attr('name');
		$folder = trim($this->folderPath);
		$path = $this->config->paths->templates . trim($this->folderPath, "/") . "/";
		
		if(!is_dir($path)) return "<p>Not a valid directory given.</p>";
		
		// markup
		$out  = "<select name='$name'>";
		$out .= "<option value=''></option>";
		$handle = opendir($path);
		while (false !== ($entry = readdir($handle))) {
			if (strpos($entry, '.') !== 0 && is_file($path.$entry)) {
				$selected = $entry == $value ? "selected" : null;
				$out .= "<option value='$entry'$selected>$entry</option>";
			}
		}
		closedir($handle);
		$out .= "</select>";

		return $out;
	}

	// be nice & trow error
	protected function setAttributeValue($value) {
		if(!strlen($value)) return '';

		$folder = trim($this->folderPath);
		$file = $this->config->paths->templates . trim($this->folderPath, "/") . "/" . $value;
		
		if(!is_file($file)) $this->error($this->name . ': ' . $this->_("File doesn't exist: ") . $file );
		
		return $value; 
	}
	
	// remove some fields
	public function ___getConfigInputfields() {
		$inputfields = parent::___getConfigInputfields();

		$f = $inputfields->get('stripTags');
		if($f) $inputfields->remove($f);
		
		$f = $inputfields->get('size');
		if($f) $inputfields->remove($f);

		$f = $inputfields->get('maxlength');
		if($f) $inputfields->remove($f);

		$f = $inputfields->get('placeholder');
		if($f) $inputfields->remove($f);

		$f = $inputfields->get('pattern');
		if($f) $inputfields->remove($f);

		return $inputfields;
	}
}