wp-flatexport/wp-flatexport.php

<?php
/*
Plugin Name: WP Flat Export
Plugin URI: https://github.com/petermolnar/wp-flatexport
Description: auto-export WordPress flat, structured, readable plain text
Version: 0.6
Author: Peter Molnar <hello@petermolnar.net>
Author URI: http://petermolnar.net/
License: GPLv3
*/

/*  Copyright 2015-2016 Peter Molnar ( hello@petermolnar.net )

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License, version 3, as
    published by the Free Software Foundation.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

namespace WP_FLATEXPORTS;

//require (__DIR__ . '/vendor/autoload.php');
//use KzykHys\FrontMatter\FrontMatter;
//use KzykHys\FrontMatter\Document;

define ( 'WP_FLATEXPORTS\FORCE', true );
define ( 'WP_FLATEXPORTS\ROOT', \WP_CONTENT_DIR . DIRECTORY_SEPARATOR
	. 'flat' . DIRECTORY_SEPARATOR );
define ( 'WP_FLATEXPORTS\POSTSROOT', ROOT . 'post'
	. DIRECTORY_SEPARATOR );
define ( 'WP_FLATEXPORTS\COMMENTROOT', ROOT . 'comments'
	. DIRECTORY_SEPARATOR );
define ( 'WP_FLATEXPORTS\FILESROOT', ROOT . 'files'
	. DIRECTORY_SEPARATOR );

\register_activation_hook( __FILE__ , '\WP_FLATEXPORTS\plugin_activate' );
\register_deactivation_hook( __FILE__ , '\WP_FLATEXPORTS\plugin_deactivate' );

// init all the things
\add_action( 'init', '\WP_FLATEXPORTS\init' );

// export on any change made to a post
\add_action( 'transition_post_status', '\WP_FLATEXPORTS\export_auto' );

// cron based export for all posts
\add_action( 'wp_flatexport', '\WP_FLATEXPORTS\export_all' );

// display plain text with https://site.com/path/to/post/text
\add_action( 'template_redirect', '\WP_FLATEXPORTS\display' );

//
\add_action( 'wp', '\WP_FLATEXPORTS\export' );

/**
 *
 */
function post_filename ( &$post, $ext = 'md' ) {
	//$timestamp = \get_the_time( 'U', $post->ID );
	//$date = date( 'Y-m-d', $timestamp );
	//if ( empty( $date ) )
		//die ( json_encode( $post ) );

	return POSTSROOT . $post->post_name . '.' . $ext;
}

/**
 *
 */
function check_rootdirs() {
	$dirs = [ POSTSROOT, FILESROOT, COMMENTROOT ];
	foreach ( $dirs as $dir ) {
		$dir = rtrim( $dir, '/' );
		if ( ! is_dir( $dir  ) ) {
			if ( ! mkdir( $dir ) ) {
				die ( "Could not create " . $dir . "directory" );
			}
		}
	}
}

/**
 * activate hook
 */
function plugin_activate() {
	if ( version_compare( phpversion(), 5.4, '<' ) ) {
		die( 'The minimum PHP version required for this plugin is 5.3' );
	}

	check_rootdirs();
}

/**
 *
 */
function plugin_deactivate() {
		wp_unschedule_event( time(), 'wp_flatexport' );
		wp_clear_scheduled_hook( 'wp_flatexport' );
}

/**
 *
 */
function init () {

	$filters = array (
		'wp_flatexport_txt' => array (
			'txt_insert_title',
			'txt_insert_excerpt',
			'txt_insert_content',
			'txt_insert_published',
			'txt_insert_urls',
			'txt_insert_author',
			'txt_insert_tags',
			'txt_insert_location',
			'txt_insert_attachments',
			'txt_insert_uuid',
		),
		'wp_flatexport_content' => array (
			'post_content_resized2orig',
			'post_content_insert_featured',
			'post_content_absolute_images',
			'post_content_clear_imgids',
			'post_content_fix_emstrong',
			'post_content_fix_dl',
			'post_content_fix_surprises',
			'post_content_url2footnote',
			'post_content_setext_headers',
		),
		'wp_flatexport_comment' => array (
			'comment_insert_type',
			'comment_insert_content',
			'comment_insert_at',
			'comment_insert_from',
			'comment_insert_for',
		),
	);

	foreach ( $filters as $for => $subfilters ) {
		foreach ( $subfilters as $k => $filter ) {
			\add_filter ( $for, "\\WP_FLATEXPORTS\\$filter", 5 * ( $k + 1 ), 2 );
		}
	}

	\add_rewrite_endpoint( 'text', EP_PERMALINK );

	if (!wp_get_schedule( 'wp_flatexport' ))
		wp_schedule_event ( time(), 'daily', 'wp_flatexport' );


}

/**
 *
 */
function display () {
	global $wp_query;
	// if this is not a request for json or a singular object then bail
	if ( ! isset( $wp_query->query_vars['text'] ) || ! is_singular() )
		return;

	// include custom template
	header("Content-Type: text/plain");
	print export();
	exit;
}

/**
 *
 */
function depthmap () {

	return array (
		1 => "=", // asciidoc, restuctured text, and markdown compatible
		2 => "-", // asciidoc, restuctured text, and markdown compatible
		//3 => "~", // asciidoc only
		//4 => "^", // asciidoc only
		//5 => "+", // asciidoc only
	);
}

/**
 *
 */
function _insert_head ( $title, $depth = 2 ) {
	if ( $depth > 2 ) {
		$prefix =  str_repeat( "#", $depth );
		$r = "\n\n{$prefix} {$title}";
	}
	else {
		$map = depthmap();
		$underline =  str_repeat( $map[ $depth ], mb_strlen( $title) );
		$r = "\n\n{$title}\n${underline}";
	}

	if ( $depth > 1 )
		$r .= "\n";

	return $r;

}

/**
 * extends the $text with
 *
 * (post title)
 * ============
 *
 */
function txt_insert_title ( $text, $post ) {

	$title = trim( $post->post_title );
	debug ( $title );

	if ( empty( $title ) )
		return $text;

	// the linebreaks are here in case the order of inserting things is changed
	$text .= _insert_head( $title, 1 );

	return $text;

}

/**
 *
 * extends the $text with
 *
 * UUID
 * ----
 * (post UUID)
 *
 * post UUID is an md5 hash of:
 *  post ID + (math add) epoch of post first publish date
 * this should not ever change!
 *
 */
function txt_insert_uuid ( $text, $post ) {

	$uuid = hash (
		'md5',
		(int)$post->ID + (int) get_post_time('U', true, $post->ID )
	);
	$text .= _insert_head( "UUID" );
	$text .= "{$uuid}";

	return $text;

}

/**
 *
 * extends the $text with
 *
 * Attachments
 * -----------
 *
 *
 *
 */
function txt_insert_attachments ( $text, $post ) {

	// get all the attachments
	$attachments = \get_children( array (
		'post_parent'=>$post->ID,
		'post_type'=>'attachment',
		'orderby'=>'menu_order',
		'order'=>'asc'
	));

	if ( empty( $attachments ) )
		return $text;

	$text .= _insert_head( "Attachments" );
	$a = array();
	foreach ( $attachments as $aid => $attachment ) {
		$attachment_path = \get_attached_file( $aid );
		if ( empty( $attachment_path ) || ! is_file( $attachment_path ) )
			continue;

		array_push( $a, "- " . basename( $attachment_path ) );
	}

	$text .= join( "\n", $a );

	return $text;

}

/**
 *
 * extends the $text with
 *
 * \n (post excerpt)
 */
function txt_insert_excerpt ( $text, $post ) {

	$excerpt = trim( $post->post_excerpt );

	if( ! empty( $excerpt  ) )
		$text .= "\n" . $excerpt;

	return $text;

}

/**
 *
 * extends the $text with
 *
 * \n (post content)
 */
function txt_insert_content ( $text, $post ) {

	$content = apply_filters(
		'wp_flatexport_content',
		trim( $post->post_content ),
		$post
	);

	if ( ! empty( $content ) )
		$text .= "\n" . $content;

	return $text;
}

/**
 *
 * extends the $text with
 *
 * Published
 * ---------
 * - (post publish date in Y-m-d H:i:s P format)
 * [- (post last update date in Y-m-d H:i:s P format)]
 */
function txt_insert_published ( $text, $post ) {

	$published = \get_the_time( 'Y-m-d H:i:s P', $post->ID );
	$modified = \get_the_modified_time( 'Y-m-d H:i:s P', $post->ID );

	$published = \get_the_time( 'U', $post->ID );
	$modified = \get_the_modified_time( 'U', $post->ID );


	$text .= _insert_head ( "Published" );
	//$text .= "initial - {$published}";
	$text .= "- " . date( 'Y-m-d H:i:s P', $published );

	if ( $published != $modified && $modified > $published )
		$text .= "\n- " . date( 'Y-m-d H:i:s P', $modified );
		//$text .= "\ncurrent - {$modified}";

	return $text;
}

/**
 *
 * extends the $text with
 *
 * URLs
 * ----
 * - http://site.com/post_ID
 * - (post shortlink)
 * - (post permalink)
 * [- additional urls, one per line]
 */
function txt_insert_urls ( $text, $post ) {

	// basic ones
	$slugs = list_urls( $post );
	$text .= _insert_head ( "URLs" );
	$text .= "- " . join ( "\n- ", $slugs );

	return $text;
}

/**
 * get all urls that are pointing to this very post, including syndications
 *
 */
function list_urls ( $post ) {

	$urls = array();
	$slugs = \get_post_meta ( $post->ID, '_wp_old_slug' );
	array_push ( $slugs, $post->post_name );
	array_push ( $slugs, $post->ID );

	// eliminate revisions
	foreach ( $slugs as $k => $slug ) {
		if ( preg_match ( '/-(revision|autosave)-v?[0-9]+/', $slug ) )
			continue;

		// make them real URLs
		// site_url does not allow numbers only as slugs, so we're doing it the
		// hard way
		array_push( $urls, rtrim ( \site_url( ), '/' ) . '/' . $slug );
	}

	// just in case these differ
	array_push ( $urls, \get_permalink( $post ) );
	//array_push ( $slugs, \wp_get_shortlink( $post->ID ) );

	// get syndicated URLs
	$syndications = \get_post_meta ( $post->ID, 'syndication_urls', true );
	if ( ! empty( $syndications ) )
		$urls = array_merge( $urls, explode( "\n", trim( $syndications ) ) );

	$sorted = array();
	// get rid of trailing slashes; it's either no trailing slash or slash on
	// everything, which breaks .html-like real document path URLs
	foreach ( $urls as $k => $url ) {
		if ( ! strstr( $url, 'http') )
			continue;
		array_push( $sorted, rtrim( $url, '/' ) );
	}



	foreach ( $sorted as $c => $url ) {
		$sorted[ $c ] = str_replace( 'http://', 'https://', $url );
	}

	// eliminate duplicates
	$sorted = array_unique ( $sorted );

	// make it more readable
	usort(
		$sorted,
		function ( $a, $b ) {
			return strlen( $a ) - strlen( $b );
		}
	);


	return $sorted;
}


/**
 *
 * extends the $text with
 *
 * Author
 * ------
 * Author Display Name [<author@email>]
 * author URLs
 */
function txt_insert_author ( $text, $post ) {

	$author_id = $post->post_author;
	$author = \get_the_author_meta ( 'display_name' , $author_id );

	if ( empty( $author ) )
		return $text;

	if ( $author_email = \get_the_author_meta ( 'email' , $author_id ) )
		$author .= " <{$author_email}>";

	if ( $author_url = \get_the_author_meta ( 'url' , $author_id ) )
		$author .= "\n{$author_url}";

	$text .= _insert_head ( "Author" );
	$text .= "{$author}";

	return $text;
}

/**
 *
 * extends the $text with
 *
 * Tags
 * ----
 * \#(comma separated list of # tags)
 */
function txt_insert_tags ( $text, $post ) {

	$raw_tags = \wp_get_post_terms( $post->ID, 'post_tag' );

	if ( empty( $raw_tags ) )
		return $text;

	$tags = array();
	foreach ( $raw_tags as $k => $tag ) {
		array_push( $tags, "#{$tag->name}" );
	}

	array_unique( $tags );
	$tags = join ( ', ', $tags );

	$text .= _insert_head ( "Tags" );
	// these are hashtags, so escape the first one to avoid converting it into
	// a header
	$text .= "\\" . $tags;

	return $text;
}

/**
 *
 * extends the $text with
 *
 * Location
 * --------
 * latitude,longitude[@altitude]
 */
function txt_insert_location ( $text, $post ) {

	// geo
	$lat = \get_post_meta ( $post->ID, 'geo_latitude' , true );
	$lon = \get_post_meta ( $post->ID, 'geo_longitude' , true );

	if ( empty( $lat ) || empty( $lon ) )
		return $text;

	$geo = "{$lat},{$lon}";

	$alt = \get_post_meta ( $post->ID, 'geo_altitude' , true );
	if ( !empty( $alt ) )
		$geo .= ",{$alt}";


	$text .= _insert_head ( "Location" );
	$text .= "{$geo}";

	return $text;
}

/**
 *
 * extends the $c with
 *
 * From
 * ------
 * Author Display Name [<author@email>]
 * avatar URL
 * [ author URL ]
 */
function comment_insert_from ( $c, $comment ) {
	$c .= _insert_head( "From" );

	$c .= "{$comment->comment_author}";

	if ( ! empty( $comment->comment_author_email ) )
		$c .= " <{$comment->comment_author_email}>";

	//if ( $avatar = \get_comment_meta ($comment->comment_ID, "avatar", true))
		//$c .= "\n{$avatar}";
	//elseif ( ! empty( $comment->comment_author_email ) )
		//$c .= "\n". gravatar ( $comment->comment_author_email );

	if ( ! empty( $comment->comment_author_url ))
		$c .= "\n{$comment->comment_author_url}";

	return $c;
}

/**
 *
 * extends the $c with
 *
 * (Type)
 * ======
 */
function comment_insert_type ( $c, $comment ) {
	if ( empty ( $comment->comment_type ) )
		$type = "Reply";
	else
		$type = ucfirst( $comment->comment_type );

	$c .= _insert_head( $type, 1 );

	return $c;
}

/**
 *
 * extends the $text with
 *
 * For
 * ---
 * original post URL
 *
 */
function comment_insert_for ( $c, $comment ) {
	$c .= _insert_head( "For" );
	$postid = $comment->comment_post_ID;
	$url = get_permalink( $postid );
	$c .= $url;

	return $c;
}


/**
 *
 * extends the $text with
 *
* At
 * --
 * (comment publish date in Y-m-d H:i:s P format)
 */
function comment_insert_at ( $c, $comment ) {
	$c .= _insert_head( "At" );
	$c .= date( 'Y-m-d H:i:s P', strtotime( $comment->comment_date ) );

	return $c;
}

/**
 *
 * extends the $c with
 *
 * \n\n (comment content) \n
 */
function comment_insert_content ( $c, $comment ) {
	if ( ! empty( $comment->comment_content ) )
		$c .= "\n" . trim( $comment->comment_content ) . "\n";

	return $c;
}


/**
 *
 */
function post_content_absolute_images ( $content, $post ) {


	$urlparts = parse_url( \site_url() );
	$domain = $urlparts ['host'];
	$wp_upload_dir = \wp_upload_dir();
	$uploadurl = str_replace(
		'/',
		"\\/",
		trim( str_replace(
			\site_url(),
			'',
			$wp_upload_dir['url']
		), '/')
	);

	$p = "/\((\/?{$uploadurl}\/.*?\.[a-zA-Z]{2,4})\)/i";
	preg_match_all( $p, $content, $images );
	if ( empty ( $images[1] ))
		return $content;

	foreach ( $images[1] as $imgstr ) {
		$fname = site_url( $imgstr );
		$content = str_replace ( $imgstr, $fname, $content );
	}
	return $content;
}


/**
 * fix all image attachments: resized -> original
 *
 */
function post_content_resized2orig ( $content, $post ) {

	$urlparts = parse_url( \site_url() );
	$domain = $urlparts ['host'];
	$wp_upload_dir = \wp_upload_dir();
	$uploadurl = str_replace(
		'/',
		"\\/",
		trim( str_replace(
			\site_url(),
			'',
			$wp_upload_dir['url']
		), '/')
	);

	$pregstr = "/((https?:\/\/". $domain .")?"
	. "\/". $uploadurl
	. "\/.*\/[0-9]{4}\/[0-9]{2}\/)(.*)-([0-9]{1,4})×([0-9]{1,4})"
	. "\.([a-zA-Z]{2,4})/";

	preg_match_all( $pregstr, $content, $resized_images );

	if ( !empty ( $resized_images[0]  )) {
		foreach ( $resized_images[0] as $cntr => $imgstr ) {
			$done_images[ $resized_images[2][$cntr] ] = 1;
			$fname = $resized_images[2][$cntr] . '.' . $resized_images[5][$cntr];
			$width = $resized_images[3][$cntr];
			$height = $resized_images[4][$cntr];
			//$r = $fname . '?resize=' . $width . ',' . $height;
			if ( ! preg_match( '/https?:\/\//i', $fname ) )
				$fname = site_url ( $fname );

			$content = str_replace ( $imgstr, $fname, $content );
		}
	}

	$pregstr = "/(https?:\/\/". $domain .")?"
	. "\/".$uploadurl
	."\/.*\/[0-9]{4}\/[0-9]{2}\/(.*?)\.([a-zA-Z]{2,4})/";

	preg_match_all( $pregstr, $content, $images );
	if ( !empty ( $images[0]  )) {

		foreach ( $images[0] as $cntr=>$imgstr ) {
			if ( !isset($done_images[ $images[1][$cntr] ]) ){
				if ( !strstr($images[1][$cntr], 'http'))
					$fname = $images[2][$cntr] . '.' . $images[3][$cntr];
				else
					$fname = $images[1][$cntr] . '.' . $images[2][$cntr];

				if ( ! preg_match( '/https?:\/\//i', $fname ) )
					$fname = site_url ( $fname );

				$content = str_replace ( $imgstr, $fname, $content );
			}
		}
	}

	return $content;
}

/**
 * insert featured image
 *
 */
function post_content_insert_featured ( $content, $post ) {

	$thid = \get_post_thumbnail_id( $post->ID );
	if ( ! empty( $thid ) ) {
		$src = \wp_get_attachment_image_src( $thid, 'full' );
		if ( isset($src[0]) ) {
			$url = \site_url( $src[0] );
			$meta = \wp_get_attachment_metadata($thid);

			if ( empty( $meta['image_meta']['title'] ) )
				$title = $post->post_title;
			else
				$title = $meta['image_meta']['title'];

			$featured = "\n\n![{$title}]({$url}){#img-{$thid}}";
			$content .= apply_filters (
				'wp_flatexport_featured_image',
				$featured,
				$post
			);
		}
	}

	return $content;
}

/**
 * get rid of markdown extra {#img-ID} -s
 *
 */
function post_content_clear_imgids ( $content, $post ) {

	$content = preg_replace( "/\{\#img-[0-9]+.*?\}/", "", $content );

	return $content;
}

/**
 * find markdown links and replace them with footnote versions
 *
 */
function post_content_url2footnote ( $content, $post ) {

	//
	$pattern = "/[\s*_\/]+(\[([^\s].*?)\]\((.*?)(\s?+[\\\"\'].*?[\\\"\'])?\))/";
	preg_match_all( $pattern, $content, $m );
	// [1] -> array of []()
	// [2] -> array of []
	// [3] -> array of ()
	// [4] -> (maybe) "" titles
	if ( ! empty( $m ) && isset( $m[0] ) && ! empty( $m[0] ) ) {
		foreach ( $m[1] as $cntr => $match ) {
			$name = trim( $m[2][$cntr] );
			$url = trim( $m[3][$cntr] );
			if ( ! strstr( $url, 'http') )
				$url = \site_url( $url );

			$title = "";

			if ( isset( $m[4][$cntr] ) && !empty( $m[4][$cntr] ) )
				$title = " {$m[4][$cntr]}";

			$refid = $cntr+1;

			$footnotes[] = "[{$refid}]: {$url}{$title}";
			$content = str_replace (
				$match,
				"[" . trim( $m[2][$cntr] ) . "][". $refid ."]" ,
				$content
			);
		}

		$content = $content . "\n\n" . join( "\n", $footnotes );
	}

	return $content;
}

/**
 * find markdown links and replace them with footnote versions
 *
 */
function post_content_fix_emstrong ( $content, $post ) {

	// these regexes are borrowed from https://github.com/erusev/parsedown
	$invalid = array (
		'strong' => array(
			//'**' => '/[*]{2}((?:\\\\\*|[^*]|[*][^*]*[*])+?)[*]{2}(?![*])/s',
			'__' => '/__((?:\\\\_|[^_]|_[^_]*_)+?)__(?!_)/us',
		),
		'em' => array (
			'*' => '/[*]((?:\\\\\*|[^*]|[*][*][^*]+?[*][*])+?)[*](?![*])/s',
			//'_' => '/_((?:\\\\_|[^_]|__[^_]*__)+?)_(?!_)\b/us',
		)
	);

	$replace_map = array (
		'*' => '_',
		//'_' => '/',
		//'**' => '*',
		'__' => '**',
	);


	foreach ( $invalid as $what => $regexes ) {
		$m = array();
		foreach ( $regexes as $key => $regex ) {
			preg_match_all( $regex, $content, $m );
			if ( empty( $m ) || ! isset( $m[0] ) || empty( $m[0] ) )
				continue;

			foreach ( array_keys ( $m[1] ) as $cntr ) {
				$content = str_replace (
					$m[0][$cntr],
					$replace_map[ $key ] . $m[1][$cntr] . $replace_map[ $key ],
					$content
				);
			}

		}
	}

	return $content;
}

/**
 *
 *
 */
function post_content_fix_dl ( $content, $post ) {
	preg_match_all( '/^.*\n(:\s+).*$/mi', $content, $m );

	if ( empty( $m ) || ! isset( $m[0] ) || empty( $m[0] ) )
		return $content;

	foreach ( $m[0] as $i => $match ) {
		$match = str_replace( $m[1][$i], ':    ', $match );
		$content = str_replace( $m[0][$i], $match, $content );
	}

	return $content;
}

/**
 *
 *
 */
function post_content_fix_surprises  ( $content, $post ) {
	$content = str_replace ( '&#039;', "'", $content );
	$content = str_replace ( "\r\n", "\n", $content );
	$content = str_replace ( "\n\r", "\n", $content );

	return $content;
}




/**
 * find all second level markdown headers and replace them with
 * underlined version
 *
 */
function post_content_setext_headers ( $content, $post ) {

	$map = depthmap();
	preg_match_all( "/^([#]+)\s?+(.*)$/m", $content, $m );

	if ( ! empty( $m ) && isset( $m[0] ) && ! empty( $m[0] ) ) {
		foreach ( $m[0] as $cntr => $match ) {
			$depth = strlen( trim( $m[1][$cntr] ) );

			if ( $depth > 2 )
				continue;

			$title = trim( $m[2][$cntr] );
			$u = str_repeat( $map[ $depth ], mb_strlen( $title ) );
			$content = str_replace ( $match, "{$title}\n{$u}", $content );
		}
	}

	return $content;
}

/**
 *
 */
function post_content ( &$post ) {
	return trim (
		apply_filters (
			'wp_flatexport_content',
			trim( $post->post_content ),
			$post
		)
	);
}

/**
 *
 */
function export_all () {

	$types = get_post_types();
	$exclude = [ 'attachment', 'revision', 'nav_menu_item' ];
	foreach ( $exclude as $ex )
		unset ( $types[ $ex ] );

	$args = [
		'posts_per_page' => -1,
		'post_types' => array_keys( $types ),
	];

	$posts = get_posts( $args );
	foreach ( $posts as $post ) {
		export ( $post );
	}

	$args = [
		'hierarchical' => 0,
		'post_type' => 'page',
		'post_status' => 'publish'
	];

	$posts = get_pages( $args );
	foreach ( $posts as $post ) {
		export ( $post, 'raw' );
	}

}

/**
 *
 */
function export_auto ( $new_status = null , $old_status = null,
	$post = null ) {
	if (  null === $new_status || null === $old_status || null === $post )
		return;

	export ( $post );
}

function export_attachments( $attachments, $post ) {

	// hardlink all the attachments; no need for copy
	// unless you're on a filesystem that does not support hardlinks, then copy
	foreach ( $attachments as $aid => $attachment ) {
		$attachment_path = \get_attached_file( $aid );
		if ( empty( $attachment_path ) || ! is_file( $attachment_path ) )
			continue;

		$attachment_file = basename( $attachment_path);
		$target_file = FILESROOT . $attachment_file;
		//$target_file = dirname( post_filename( $post ) ) . DIRECTORY_SEPARATOR . $attachment_file;
		debug ( "exporting {$attachment_file}", 6 );

		if ( is_file( $target_file ) ) {
			debug ( "{$target_file} already exists", 7 );
			continue;
		}

		if ( link( $attachment_path, $target_file ) ) {
			debug ( "{$attachment_path} was hardlinked to {$target_file}", 7 );
			continue;
		}
		else {
			if ( copy( $attachment_path, $target_file ) ) {
				debug ( "{$attachment_path} was copied to {$target_file}", 7 );
				continue;
			}
			else {
				debug( "could not link or copy '{$attachment_path}'"
					. " to '{$target_file}'; saving attachment failed!", 4);
			}
		}
	}
}

/**
 *
 */
function export ( $post = null, $mode = 'normal' ) {

	check_rootdirs();

	if ( null === $post ) {
		 if ( ! \is_singular() )
			return false;
	}

	$post = fix_post( $post );
	if ( $post === false )
		return false;

	// create directory structure
	$flatfile = post_filename( $post );

	$post_timestamp = \get_the_time( 'U', $post->ID );
	$file_timestamp = 0;

	if ( @file_exists($flatfile) ) {
		$file_timestamp = @filemtime ( $flatfile );
	}

	// get all the attachments
	$attachments = \get_children( array (
		'post_parent'=>$post->ID,
		'post_type'=>'attachment',
		'orderby'=>'menu_order',
		'order'=>'asc'
	));

	if ( ! empty( $attachments ) ) {
		export_attachments( $attachments, $post );
	}

	// deal with comments
	$comments = get_comments ( array( 'post_id' => $post->ID ) );
	if ( $comments ) {
		foreach ($comments as $comment) {
			export_comment ( $post, $comment );
		}
	}

	// in case our export is fresh or we're not forcing updates on each and
	// every time, walk away from this post
	if ( $file_timestamp == $post_timestamp && FORCE == false ) {
		return true;
	}

	if ( $mode == 'raw' )
		$txt = apply_filters (
			'wp_flatexport_content',
			trim( $post->post_content ),
			$post
		);
	else
		$txt = trim ( apply_filters ( 'wp_flatexport_txt', "", $post ) ) . "\n\n";

	// write log
	debug ( "Exporting #{$post->ID}, {$post->post_name} to {$flatfile}", 6 );
	file_put_contents ($flatfile, $txt);
	touch ( $flatfile, $post_timestamp );

	touch ( dirname( $flatfile), $post_timestamp );

	return $txt;
}

/**
 *
 */
function export_comment ( $post, $comment ) {
	$flatdir = dirname( post_filename( $post ) );

	$c_timestamp = strtotime( $comment->comment_date );
	$cfile = date( 'Y-m-d-H-i-s', $c_timestamp ) . '.md';
	$cfile = COMMENTROOT . $cfile;

	$cf_timestamp = 0;
	if ( @file_exists($cfile) ) {
		$cf_timestamp = @filemtime ( $cfile );
	}

	// non force mode means skip existing
	if ( $c_timestamp == $cf_timestamp && FORCE == false ) {
		return;
	}

	$c = trim ( apply_filters ( 'wp_flatexport_comment', "", $comment ) );

	debug ( "Exporting comment # {$comment->comment_ID} to {$cfile}", 6 );
	file_put_contents ($cfile, $c);
	touch ( $cfile, $c_timestamp );
}

/**
 * generate gravatar img link
 */
function gravatar ( $email ) {
	return sprintf(
		'https://s.gravatar.com/avatar/%s?=64',
		md5( strtolower( trim( $email ) ) )
	);
}

/**
 * do everything to get the Post object
 */
function fix_post ( &$post = null ) {
	if ($post === null || !is_post($post))
		global $post;

	if (is_post($post))
		return $post;

	return false;
}

/**
 * test if an object is actually a post
 */
function is_post ( &$post ) {
	if ( ! empty( $post ) &&
			 is_object( $post ) &&
			 isset( $post->ID ) &&
			 ! empty( $post->ID ) )
		return true;

	return false;
}

/**
 *
 * debug messages; will only work if WP_DEBUG is on
 * or if the level is LOG_ERR, but that will kill the process
 *
 * @param string $message
 * @param int $level
 *
 * @output log to syslog | wp_die on high level
 * @return false on not taking action, true on log sent
 */
function debug( $message, $level = LOG_NOTICE ) {
	if ( empty( $message ) )
		return false;

	if ( @is_array( $message ) || @is_object ( $message ) )
		$message = json_encode($message);

	$levels = array (
		LOG_EMERG => 0, // system is unusable
		LOG_ALERT => 1, // Alert 	action must be taken immediately
		LOG_CRIT => 2, // Critical 	critical conditions
		LOG_ERR => 3, // Error 	error conditions
		LOG_WARNING => 4, // Warning 	warning conditions
		LOG_NOTICE => 5, // Notice 	normal but significant condition
		LOG_INFO => 6, // Informational 	informational messages
		LOG_DEBUG => 7, // Debug 	debug-level messages
	);

	// number for number based comparison
	// should work with the defines only, this is just a make-it-sure step
	$level_ = $levels [ $level ];

	// in case WordPress debug log has a minimum level
	if ( defined ( '\WP_DEBUG_LEVEL' ) ) {
		$wp_level = $levels [ \WP_DEBUG_LEVEL ];
		if ( $level_ > $wp_level ) {
			return false;
		}
	}

	// ERR, CRIT, ALERT and EMERG
	if ( 3 >= $level_ ) {
		\wp_die( '<h1>Error:</h1>' . '<p>' . $message . '</p>' );
		exit;
	}

	$trace = debug_backtrace();
	$caller = $trace[1];
	$parent = $caller['function'];

	if (isset($caller['class']))
		$parent = $caller['class'] . '::' . $parent;

	if (isset($caller['namespace']))
		$parent = $caller['namespace'] . '::' . $parent;

	return error_log( "{$parent}: {$message}" );
}