Integration of PgnViewerJS into WordPress. This is a small layer around the original PgnViewerJS, but is needed to use it in a WordPress installation. The plugin should provide the following interfaces:

[pgnv]1. e4 e5 2. ...[/pgnv]

This is the PgnViewer (mostly needed): allows to play through a game (including variations), printing the comments, NAGs, ...

 [pgne]1. e4 ...[/pgne]

Allows to edit and view a game. At the end, you may use the PGN button to display the notation, that then may be copied again in the WordPress post entry.

 [pgnb fen=<a FEN string>][/pgnb]

Displays a board position only, no moves.

 [pgnp]1. e4 e5D 2. Nf3 Nc6D ...[/pgnp]

Allows to print a game in a format similar to magazines and books. For that purpose, the notation of PGN was expanded by the "D" at the end of a move, that stands for the diagram.

The build is done with Grunt, so the package.json file helps how to install the necessary tools. After installation, do the following steps:

• Go into the root directory (with node.js, npm and Grunt installed).
• Run grunt without any arguments.
• This will build the distribution currently named PgnViewerJS-WP.zip.
• Go to your WordPress website (as administrator), and upload the plugin.
• Activate the plugin in WordPress.
• Build an example page with the following in it: [pgne]1. e4[/pgne]
• Save the page, and open the URL to the page.

If everything works well, you will have now a page with a rendered chessboard in it, which is in edit mode, so you may now add moves that are shown in the section below. Read the documentation of PgnViewerJS what to do with the tool then.

• Update the implementation to use the new box model. At the moment, users have to include classic boxes to have the chess games visualized.
• Allow to have a default configuration, so that has not to be repeated all the time on each page.

This will explain the configuration options that are directly supported. Details will be contained in the father implementation, so only the mapping in WordPress has to be explained. Here is a list of the relevant parameters:

• position: Gives the FEN string of the start position of the game. Default is the inital position.
• orientation: values are white (default) or black.
• layout: values are top (default, board at the top, moves at the bottom) or left (board at the left, moves at the right).
• size: the width of the column including everything, like 750px.
• boardsize: the width of the board alone, like 400px.
• locale: the locale to use for tooltips and the move SAN notation. Values are: en, de, fr, es and many more.
• piecestyle: values are merida (default), wikipedia, alpha, uscf, case, condal, maya, leipzig, beyer and chesscom.
• theme: values are zeit (default), green, chesscom, informator, sportverlag, beyer, falken, blue.

For other configuration parameters, see the online documentation of the configuration of the original viewer. Convention here is, that the parameters are all lowercase in WP, but converted then back for the call of PgnViewerJS.

A complete example looks like:

[pgnv position="r1bq1rk1/1p2nppp/1bp2n2/4p3/P1B1P3/B1P2N2/3N1PPP/R2QK2R b KQ - 3 13" 
orientation=black layout=left size=750px boardsize=400px locale=de ] 
13... Bxf2+!? 14. Kxf2 Ng4+ 15. Kg1? (15. Ke2 Qb6 16. Qg1) Qb6+! 16. Nd4 exd4 
17. Rb1 Qa7 18. Qf3 d3+ 19. Kf1 Ne3+ 20. Ke1 Bg4 21. Qg3 Nc2+ 22. Kf1 Be2# [/pgnv]

• GitHub: Here is the original JavaScript implementation available.
• PgnV Demo: Demonstration web site for the features that are currently inluded in PgnViewerJS, and may soon be integrated into the Wordpress plugin in a similar way.
• Grunt: Grunt documentation