Drupal module to migrate to Ghost

ghost.info

name = Ghost Export
description = Export your content to Ghost
core = 7.x
package = ghost

ghost.module

<?php


function ghost_menu() {
	$items["admin/config/system/ghost"] = array(
		'title' => 'Export content to Ghost',
		'page callback' => 'drupal_get_form',
		'page arguments' => array('ghost_export_page'),
		'access arguments' => array("administer site configuration"),
		'description' => 'Helps you export your content to a JSON file compatible with Ghost'
	);

	return $items;
}

function ghost_export_page($form) {
	$types = array();
	$content_types = node_type_get_types();
	foreach($content_types as $type) {
		$types[$type->type] = $type->name;
	}

	$vocabularies = array();
	$vocabs = taxonomy_get_vocabularies();
	foreach($vocabs as $vocab) {
		$vocabularies[$vocab->vid] = $vocab->name;
	}

	$form["type"] = array(
		'#type' => 'select',
		'#title' => t("Content type to export"),
		'#options' => $types,
		'#required' => TRUE,
		'#description' => t("Select from the list the content type you want to export")
	);

	$form["vid"] = array(
		'#type' => 'select',
		'#title' => t("Vobaculary to use with tags"),
		'#options' => $vocabularies,
		'#required' => TRUE,
		'#description' => t("Select from the list the vocabulary to use if you want to export tags")
	);

	$form["submit"] = array(
		'#type' => 'submit',
		'#value' => t("Create file")
	);

	return $form;
}

function ghost_export_page_submit(&$form, &$form_state) {
	$type = $form_state["values"]["type"];
	$vid = $form_state["values"]["vid"];
	$uid = 1;

	$export = array(
		'meta' => ghost_export_meta(),
		'data' => array(
			'posts' => ghost_export_nodes($type),
			'tags' => ghost_export_tags(1),
			'post_tags' => ghost_export_post_tags($type),
			'users' => ghost_export_user($uid),
			"roles_users" => ghost_export_roles_users(),
		)
	);

	$filedir = 'sites/default/files';
	$filename = "export_" . time() . ".json";
	$content = drupal_json_encode($export);
	$handle = fopen( $filedir . '/' . $filename, 'w' );
	fwrite( $handle, $content );
	fclose( $handle );

	header( 'Content-Description: File Transfer' );
	header( 'Content-Type: application/octet-stream' );
	header( 'Content-Disposition: attachment; filename='.$filename );
	header( 'Content-Transfer-Encoding: binary' );
	header( 'Expires: 0' );
	header( 'Cache-Control: must-revalidate' );
	header( 'Pragma: public' );
	header( 'Content-Length: ' . filesize( $filedir . '/' . $filename ) );

	flush();
	readfile( $filedir . '/' . $filename );
	exit;
}

function ghost_export_meta() {
  $meta = array(
  	'exported_on' => time(),
  	'version' => '003'
  );

  return $meta;
}

function ghost_export_tags($vid) {
	$tags = array();
	$terms = taxonomy_get_tree($vid);
	foreach($terms as $term) {
		$tag = array(
			"id" => $term->tid,
			"name" => $term->name,
			"slug" => $term->name,
			"description" => $term->description
		);

		$tags[] = $tag;
	}

	return $tags;
}

function ghost_export_user($uid) {
	$users = array();
	$user = user_load($uid);

	$users[0] = array(
		'id' => $user->uid,
		'name' => $user->name,
		'slug' => $user->name,
		'email' => $user->mail,
		"image" => null,
    "cover" => null,
    "bio" => null,
    "website" => null,
    "location" => null,
    "accessibility" => null,
    "status" => "active",
    "language" => "en_US",
    "meta_title" => null,
    "meta_description" => null,
    "last_login" => null,
    "created_at" => $user->created, // epoch time in millis
    "created_by" => 1, // the first user created has an id of 1
    "updated_at" =>  $user->created, // epoch time in millis
    "updated_by" => 1 // the first user created has an id of 1
	);

	return $users;
}

function ghost_export_nodes($content_type) {
	$exports = array();
	$nodes = node_load_multiple(array(), array("type" => check_plain($content_type)));
	foreach($nodes as $node) {
		$item = array(
			"id" => $node->nid,
			"title" => $node->title,
			"slug" => $node->title,
			"markdown" => $node->body["und"][0]["value"],
			"html" => $node->body["und"][0]["safe_value"],
			"image" => null,
			"featured" => 0,
			"page" => 0,
			'status' => "published",
			'language' => 'en_US',
			'meta_title' => $node->title,
			'meta_description' => $node->body["und"][0]["value"],
			'author_id' => 1,
			'created_at' => $node->created,
			'created_by' => 1,
			'updated_at' => $node->changed,
			'updated_by' => 1,
			'published_at' => $node->created,
			'published_by' => 1
		);

		$exports[] = $item;
	}

	return $exports;
}

function ghost_export_post_tags($content_type) {
	$exports = array();
	$nodes = node_load_multiple(array(), array("type" => check_plain($content_type)));
	foreach($nodes as $node) {
		$tags = $node->field_tags["und"];
		foreach($tags as $tag) {
			$relationship = array(
				'tag_id' => $tag["tid"],
				'post_id' => $node->nid
			);
		}

		$exports[] = $relationship;
	}
	return $exports;
}

function ghost_export_roles_users() {
	return array(

	);
}

HTML_To_Markdown.php

<?php
/**
 * Class HTML_To_Markdown
 *
 * A helper class to convert HTML to Markdown.
 *
 * @version 2.1.1
 * @author Nick Cernis <nick@cern.is>
 * @link https://github.com/nickcernis/html2markdown/ Latest version on GitHub.
 * @link http://twitter.com/nickcernis Nick on twitter.
 * @license http://www.opensource.org/licenses/mit-license.php MIT
 */
class HTML_To_Markdown {
	/**
	 * @var DOMDocument The root of the document tree that holds our HTML.
	 */
	private $document;

	/**
	 * @var string|boolean The Markdown version of the original HTML, or false if conversion failed
	 */
	private $output;

	/**
	 * @var array Class-wide options users can override.
	 */
	private $options = array(
		'header_style' => 'setext', // Set to "atx" to output H1 and H2 headers as # Header1 and ## Header2
		'suppress_errors' => true, // Set to false to show warnings when loading malformed HTML
		'strip_tags' => false, // Set to true to strip tags that don't have markdown equivalents. N.B. Strips tags, not their content. Useful to clean MS Word HTML output.
		'bold_style' => '**', // Set to '__' if you prefer the underlined style
		'italic_style' => '*', // Set to '_' if you prefer the underlined style
	);


	/**
	 * Constructor
	 *
	 * Set up a new DOMDocument from the supplied HTML, convert it to Markdown, and store it in $this->$output.
	 *
	 * @param string $html The HTML to convert to Markdown.
	 * @param array $overrides [optional] List of style and error display overrides.
	 */
	public function __construct( $html = null, $overrides = null ) {
		if ( $overrides ) {
			$this->options = array_merge( $this->options, $overrides );
		}

		if ( $html ) {
			$this->convert( $html );

		}
	}


	/**
	 * Setter for conversion options
	 *
	 * @param $name
	 * @param $value
	 */
	public function set_option( $name, $value ) {
		$this->options[$name] = $value;
	}


	/**
	 * Convert
	 *
	 * Loads HTML and passes to get_markdown()
	 *
	 * @param $html
	 * @return string The Markdown version of the html
	 */
	public function convert( $html )
	{
		$html = preg_replace( '~>\s+<~', '><', $html ); // Strip white space between tags to prevent creation of empty #text nodes

		$this->document = new DOMDocument();

		if ( $this->options['suppress_errors'] ) {
			libxml_use_internal_errors( true ); // Suppress conversion errors (from http://bit.ly/pCCRSX )
		}

		$this->document->loadHTML( '<?xml encoding="UTF-8">' . $html ); // Hack to load utf-8 HTML (from http://bit.ly/pVDyCt )
		$this->document->encoding = 'UTF-8';

		if ( $this->options['suppress_errors'] ) {
			libxml_clear_errors();
		}

		return $this->get_markdown( $html );
	}


	/**
	 * Is Child Of?
	 *
	 * Is the node a child of the given parent tag?
	 *
	 * @param $parent_name string The name of the parent node to search for (e.g. 'code')
	 * @param $node
	 * @return bool
	 */
	private static function is_child_of( $parent_name, $node ) {
		for ( $p = $node->parentNode; $p != false; $p = $p->parentNode ) {
			if ( is_null( $p ) ) {
				return false;
			}

			if ( $p->nodeName == $parent_name ) {
				return true;
			}
		}
		return false;
	}


	/**
	 * Convert Children
	 *
	 * Recursive function to drill into the DOM and convert each node into Markdown from the inside out.
	 *
	 * Finds children of each node and convert those to #text nodes containing their Markdown equivalent,
	 * starting with the innermost element and working up to the outermost element.
	 *
	 * @param $node
	 */
	private function convert_children( $node ) {
		// Don't convert HTML code inside <code> blocks to Markdown - that should stay as HTML
		if ( self::is_child_of( 'code', $node ) ) {
			return;
		}

		// If the node has children, convert those to Markdown first
		if ( $node->hasChildNodes() ) {
			$length = $node->childNodes->length;

			for ( $i = 0; $i < $length; $i++ ) {
				$child = $node->childNodes->item( $i );
				$this->convert_children( $child );
			}
		}

		// Now that child nodes have been converted, convert the original node
		$this->convert_to_markdown( $node );
	}


	/**
	 * Get Markdown
	 *
	 * Sends the body node to convert_children() to change inner nodes to Markdown #text nodes, then saves and
	 * returns the resulting converted document as a string in Markdown format.
	 *
	 * @return string|boolean The converted HTML as Markdown, or false if conversion failed
	 */
	private function get_markdown()
	{
		// Use the body tag as our root element
		$body = $this->document->getElementsByTagName( 'body' )->item( 0 );

		// Try the head tag if there's no body tag (e.g. the user's passed a single <script> tag for conversion)
		if ( ! $body ) {
			$body = $this->document->getElementsByTagName( 'head' )->item( 0 );
		}

		if ( ! $body ) {
			return false;
		}

		// Convert all children of the body element. The DOMDocument stored in $this->doc will
		// then consist of #text nodes, each containing a Markdown version of the original node
		// that it replaced.
		$this->convert_children( $body );

		// Sanitize and return the body contents as a string.
		$markdown = $this->document->saveHTML(); // stores the DOMDocument as a string
		$markdown = html_entity_decode( $markdown, ENT_QUOTES, 'UTF-8' );
		$markdown = html_entity_decode( $markdown, ENT_QUOTES, 'UTF-8' ); // Double decode to cover cases like &amp;nbsp; http://www.php.net/manual/en/function.htmlentities.php#99984
		$markdown = preg_replace( '/<!DOCTYPE [^>]+>/', '', $markdown ); // Strip doctype declaration
		$unwanted = array( '<html>', '</html>', '<body>', '</body>', '<head>', '</head>', '<?xml encoding="UTF-8">', '&#xD;' );
		$markdown = str_replace( $unwanted, '', $markdown ); // Strip unwanted tags
		$markdown = trim( $markdown, '\n\r\0\x0B' );

		$this->output = $markdown;

		return $markdown;
	}


	/**
	 * Convert to Markdown
	 *
	 * Converts an individual node into a #text node containing a string of its Markdown equivalent.
	 *
	 * Example: An <h3> node with text content of "Title" becomes a text node with content of "### Title"
	 *
	 * @param $node
	 */
	private function convert_to_markdown( $node ) {
		$tag = $node->nodeName; // the type of element, e.g. h1
		$value = $node->nodeValue; // the value of that element, e.g. The Title

		switch ( $tag ) {
			case 'p':
			case 'pre':
				$markdown = ( trim( $value ) ) ? rtrim( $value ) . PHP_EOL . PHP_EOL : '';
				break;
			case 'h1':
			case 'h2':
				$markdown = $this->convert_header( $tag, $node );
				break;
			case 'h3':
				$markdown = '### ' . $value . PHP_EOL . PHP_EOL;
				break;
			case 'h4':
				$markdown = '#### ' . $value . PHP_EOL . PHP_EOL;
				break;
			case 'h5':
				$markdown = '##### ' . $value . PHP_EOL . PHP_EOL;
				break;
			case 'h6':
				$markdown = '###### ' . $value . PHP_EOL . PHP_EOL;
				break;
			case 'em':
			case 'i':
			case 'strong':
			case 'b':
				$markdown = $this->convert_emphasis( $tag, $value );
				break;
			case 'hr':
				$markdown = '- - - - - -' . PHP_EOL . PHP_EOL;
				break;
			case 'br':
				$markdown = '  ' . PHP_EOL;
				break;
			case 'blockquote':
				$markdown = $this->convert_blockquote( $node );
				break;
			case 'code':
				$markdown = $this->convert_code( $node );
				break;
			case 'ol':
			case 'ul':
				$markdown = $value . PHP_EOL;
				break;
			case 'li':
				$markdown = $this->convert_list( $node );
				break;
			case 'img':
				$markdown = $this->convert_image( $node );
				break;
			case 'a':
				$markdown = $this->convert_anchor( $node );
				break;
			case '#text':
				$markdown = preg_replace( '~\s+~', ' ', $value );
				break;
			case '#comment':
				$markdown = '';
				break;
			default:
				// If strip_tags is false (the default), preserve tags that don't have Markdown equivalents,
				// such as <span> and #text nodes on their own. C14N() canonicalizes the node to a string.
				// See: http://www.php.net/manual/en/domnode.c14n.php
				$markdown = ($this->options['strip_tags']) ? $value : html_entity_decode( $node->C14N() );
		}

		// Create a DOM text node containing the Markdown equivalent of the original node
		$markdown_node = $this->document->createTextNode( $markdown );

		// Replace the old $node e.g. "<h3>Title</h3>" with the new $markdown_node e.g. "### Title"
		$node->parentNode->replaceChild( $markdown_node, $node );
	}


	/**
	 * Convert Header
	 *
	 * Converts h1 and h2 headers to Markdown-style headers in setext style,
	 * matching the number of underscores with the length of the title.
	 *
	 * e.g.	 Header 1	Header Two
	 *		  ========	----------
	 *
	 * Returns atx headers instead if $this->options['header_style'] is "atx"
	 *
	 * e.g.	# Header 1   ## Header Two
	 *
	 * @param string $level The header level, including the "h". e.g. h1
	 * @param string $node The node to convert.
	 * @return string The Markdown version of the header.
	 */
	private function convert_header( $level, $node ) {
		$content = $node->nodeValue;

		if ( ! $this->is_child_of( 'blockquote', $node ) && $this->options['header_style'] == 'setext' ) {
			$length = ( function_exists( 'mb_strlen' ) ) ? mb_strlen( $content, 'utf-8' ) : strlen( $content );
			$underline = ($level == 'h1' ) ? '=' : '-';
			$markdown = $content . PHP_EOL . str_repeat( $underline, $length ) . PHP_EOL . PHP_EOL; // setext style
		} else {
			$prefix = ( $level == 'h1' ) ? '# ' : '## ';
			$markdown = $prefix . $content . PHP_EOL . PHP_EOL; // atx style
		}

		return $markdown;
	}


	/**
	 * Converts inline styles
	 * This function is used to render strong and em tags
	 *
	 * eg <strong>bold text</strong> becomes **bold text** or __bold text__
	 *
	 * @param string $tag
	 * @param string $value
	 * @return string
	 */
	private function convert_emphasis( $tag, $value ) {
		if ( $tag == 'i' || $tag == 'em' ) {
			$markdown = $this->options['italic_style'] . $value . $this->options['italic_style'];
		} else {
			$markdown = $this->options['bold_style'] . $value . $this->options['bold_style'];
		}

		return $markdown;
	}


	/**
	 * Convert Image
	 *
	 * Converts <img /> tags to Markdown.
	 *
	 * e.g.	 <img src="/path/img.jpg" alt="alt text" title="Title" />
	 * becomes  ![alt text](/path/img.jpg "Title")
	 *
	 * @param $node
	 * @return string
	 */
	private function convert_image( $node ) {
		$src = $node->getAttribute( 'src' );
		$alt = $node->getAttribute( 'alt' );
		$title = $node->getAttribute( 'title' );

		if ( $title != '' ) {
			$markdown = '![' . $alt . '](' . $src . ' "' . $title . '")'; // No newlines added. <img> should be in a block-level element.
		} else {
			$markdown = '![' . $alt . '](' . $src . ')';
		}

		return $markdown;
	}


	/**
	 * Convert Anchor
	 *
	 * Converts <a> tags to Markdown.
	 *
	 * e.g.	 <a href="http://modernnerd.net" title="Title">Modern Nerd</a>
	 * becomes  [Modern Nerd](http://modernnerd.net "Title")
	 *
	 * @param $node
	 * @return string
	 */
	private function convert_anchor( $node ) {
		$href = $node->getAttribute( 'href' );
		$title = $node->getAttribute( 'title' );
		$text = $node->nodeValue;

		if ( $title != '' ) {
			$markdown = '[' . $text . '](' . $href . ' "' . $title . '")';
		} else {
			$markdown = '[' . $text . '](' . $href . ')';
		}

		// Append a space if the node after this one is also an anchor
		$next_node_name = $this->get_next_node_name( $node );

		if ( $next_node_name == 'a' ) {
			$markdown = $markdown . ' ';
		}

		return $markdown;
	}


	/**
	 * Convert List
	 *
	 * Converts <ul> and <ol> lists to Markdown.
	 *
	 * @param $node
	 * @return string
	 */
	private function convert_list( $node ) {
		// If parent is an ol, use numbers, otherwise, use dashes
		$list_type = $node->parentNode->nodeName;
		$value = $node->nodeValue;

		if ( $list_type == 'ul' ) {
			$markdown = '- ' . trim( $value ) . PHP_EOL;
		} else {
			$number = $this->get_position( $node );
			$markdown = $number . '. ' . trim( $value ) . PHP_EOL;
		}

		return $markdown;
	}


	/**
	 * Convert Code
	 *
	 * Convert code tags by indenting blocks of code and wrapping single lines in backticks.
	 *
	 * @param $node
	 * @return string
	 */
	private function convert_code( $node ) {
		// Store the content of the code block in an array, one entry for each line

		$markdown = '';

		$code_content = html_entity_decode( $node->C14N() );
		$code_content = str_replace( array( '<code>', '</code>'), '', $code_content );

		$lines = preg_split( '/\r\n|\r|\n/', $code_content );
		$total = count( $lines );

		// If there's more than one line of code, prepend each line with four spaces and no backticks.
		if ( $total > 1 ) {

			// Remove the first and last line if they're empty
			$first_line = trim( $lines[0] );
			$last_line = trim( $lines[$total - 1] );
			$first_line = trim( $first_line, '&#xD;' ); //trim XML style carriage returns too
			$last_line = trim( $last_line, '&#xD;' );

			if ( empty( $first_line ) ) {
				array_shift( $lines );
			}

			if ( empty( $last_line ) ) {
				array_pop( $lines );
			}

			$count = 1;
			foreach ( $lines as $line ) {
				$line = str_replace( '&#xD;', '', $line );
				$markdown .= '	' . $line;
				// Add newlines, except final line of the code
				if ( $count != $total ) {
					$markdown .= PHP_EOL;
				}
				$count++;
			}
			$markdown .= PHP_EOL;

		} else { // There's only one line of code. It's a code span, not a block. Just wrap it with backticks.

			$markdown .= '`' . $lines[0] . '`';

		}

		return $markdown;
	}


	/**
	 * Convert blockquote
	 *
	 * Prepend blockquotes with > chars.
	 *
	 * @param $node
	 * @return string
	 */
	private function convert_blockquote( $node ) {
		// Contents should have already been converted to Markdown by this point,
		// so we just need to add ">" symbols to each line.

		$markdown = '';

		$quote_content = trim( $node->nodeValue );

		$lines = preg_split( '/\r\n|\r|\n/', $quote_content );

		$total_lines = count( $lines );

		foreach ( $lines as $i => $line ) {
			$markdown .= '> ' . $line . PHP_EOL;
			if ( $i + 1 == $total_lines ) {
				$markdown .= PHP_EOL;

			}
		}

		return $markdown;
	}


	/**
	 * Get Position
	 *
	 * Returns the numbered position of a node inside its parent
	 *
	 * @param $node
	 * @return int The numbered position of the node, starting at 1.
	 */
	private function get_position( $node ) {
		// Get all of the nodes inside the parent
		$list_nodes = $node->parentNode->childNodes;
		$total_nodes = $list_nodes->length;

		$position = 1;

		// Loop through all nodes and find the given $node
		for ( $a = 0; $a < $total_nodes; $a++ ) {
			$current_node = $list_nodes->item( $a );

			if ( $current_node->isSameNode( $node ) ) {
				$position = $a + 1;
			}
		}

		return $position;
	}


	/**
	 * Get Next Node Name
	 *
	 * Return the name of the node immediately after the passed one.
	 *
	 * @param $node
	 * @return string|null The node name (e.g. 'h1') or null.
	 */
	private function get_next_node_name( $node ) {
		$next_node_name = null;

		$current_position = $this->get_position( $node );
		$next_node = $node->parentNode->childNodes->item( $current_position );

		if ( $next_node ) {
			$next_node_name = $next_node->nodeName;
		}

		return $next_node_name;
	}


	/**
	 * To String
	 *
	 * Magic method to return Markdown output when HTML_To_Markdown instance is treated as a string.
	 *
	 * @return string
	 */
	public function __toString()
	{
		return $this->output();
	}


	/**
	 * Output
	 *
	 * Getter for the converted Markdown contents stored in $this->output
	 *
	 * @return string
	 */
	public function output()
	{
		if ( ! $this->output ) {
			return '';
		} else {
			return $this->output;
		}
	}
}