Better WordPress Media Handling

gistfile1.txt

if ( current_user_can( 'edit_posts' ) ) {
	// Tell the TinyMCE editor to use a custom stylesheet
	// See http://codex.wordpress.org/Function_Reference/add_editor_style
	add_theme_support( 'editor_style' );
	add_editor_style( 'assets/css/editor-style.css' );
	
	// Prevent WordPress from uploading duplicate files
	// Checks to see if both filenames match and then overwrites only if the filesizes are different
	function groundup_remove_duplicate_attachment( $file ) {
		$upload_dir = wp_upload_dir();
		// replace spaces with dashes just like WordPress does
		$filename = str_replace( ' ', '-', $file['name'] );
		if ( file_exists( $upload_dir['path'] . '/' . $filename ) ) {
			// Compare filesizes
			if ( filesize( $upload_dir['path'] . '/' . $filename ) != $file['size'] ) {
				// query the attachment so that it will be deleted and removed from media library
				$args = array(
					'numberposts' => 1,
					'post_type' => 'attachment',
					'meta_query' => array(
						array(
							'key' => '_wp_attached_file',
							'value' => trim($upload_dir['subdir'] . '/' . $filename, '/')
						)
					)
				);
				$attachment_file = get_posts($args);
				wp_delete_attachment( $attachment_file[0]->ID, true );
			} else {
				// remove filename and replace with an error so the file will not be re-uploaded
				$file = array('name'=>$filename, 'error'=>'Image ' . $filename . ' already exists.');
			} 
		}
		return $file;
	}
	add_filter( 'wp_handle_upload_prefilter', 'groundup_remove_duplicate_attachment' );
	
	// change image suffixes to <filename>-<image_size>
	// TODO: Don't think this will work if multiple sizes share width or height
	// 	Look into finding out which image size it is another way!
	function groundup_image_suffix( $image ) {
		// Split the $image path into directory/extension/name
		$info = pathinfo( $image );
		$dir = $info['dirname'] . '/';
		$ext = '.' . $info['extension'];
		$file_name = wp_basename( $image, "$ext" );
		$image_name = substr( $file_name, 0, strrpos( $file_name, '-' ) );
		
		// Get image information 
		$img = wp_get_image_editor( $image );
		// Get image size, width and height
		$img_size = $img->get_size();
		
		// Get new image suffix by comparing image sizes
		$image_sizes = get_intermediate_image_sizes();
		
		foreach ( $image_sizes as $size ) {
			$rename = false;
			$sizeInfo = get_image_size_data( $size );
			if ( $img_size['width'] == $sizeInfo['width'] && $img_size['height'] <= $sizeInfo['height'] ) {
				$rename = true;	
			} elseif ( $img_size['height'] == $sizeInfo['height'] && $img_size['width'] <= $sizeInfo['width'] ) {
				$rename = true;	
			}
			
			if ( $rename == true ) {
				// Rename image
				$new_name = $dir . $image_name . '-' . $size . $ext;
				
				// Rename the intermediate size
				$rename_success = rename( $image, $new_name );
				if ( $rename_success ) {
					return $new_name;
				}
			}
		}
		
		// do nothing if not renamed
		return $image;
	}
	add_filter( 'image_make_intermediate_size', 'groundup_image_suffix' );