Google Books and Mediawiki

Following on from the previous post, I wrote a simpe Mediawiki extension to insert a Google Book into a wiki page. Written in a few minutes, not tested much, etc.

To use this, copy the code below and save in a file googlebook.php in the extensions directory of your Mediawiki installation.

# rdmp

# Google Book extension
# Embed a Google Book into Mediawiki
#
# Usage:
# 
# 
# To install it put this file in the extensions directory 
# To activate the extension, include it from your LocalSettings.php
# with: require("extensions/googlebook.php");
 
$wgExtensionFunctions[] = "wfGoogleBook";
 
function wfGoogleBook() {
    global $wgParser;
    # registers the  extension with the WikiText parser
    $wgParser->setHook( "googlebook", "renderGoogleBook" );
}
 
# The callback function for converting the input text to HTML output
function renderGoogleBook( $input, $argv ) 
{
 $width = 425;
 $height = 400;
 
 if (isset($argv["width"]))
 {
  $width = $argv["width"];
 }
 if (isset($argv["height"]))
 {
  $width = $argv["height"];
 }
    
 $output = '            src="http://books.google.com/books/previewlib.js">
           ';
 $output .= ' <br />            GBS_insertEmbeddedViewer(\'' <br />            . $argv["id"] . '\','. $width . ',' . $height . ');<br />           ';   

    return $output;
}
?>

In your LocalSettings.php file add the line

require("extensions/googlebook.php");

Now you can add a Google book to a wiki page by adding a tag. For example:

The id gives the book identifier (such as an OCLC number or a ISBN (you need to include the identifier prefix). By defaulot, the book will appear in a box 425 × 400 pixels in size. You can add optional width and height parameters to adjust this.