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This plugin make it easy, Quicktags add to the html - and visual-editor.. It is possible to ex- and import your Quicktags.

WP-AddQuicktag for WordPress is in originally by Roel Meurders. The versions of the Repo to AddQuicktag are newer versions, completly rewrite with version 2.0.0 and more functionalities.

The plugin add the quicktag on default to post types post and page. If you will also the plugin for other post types you can use a filter; see the follow example or an example plugin in the Gist 1595155.

// add custom function to filter hook 'addquicktag_post_types'
add_filter( 'addquicktag_post_types', 'my_addquicktag_post_types' );
/**
 * Return array $post_types with custom post types
 * 
 * @param   $post_type Array
 * @return  $post_type Array
 */
function my_addquicktag_post_types( $post_types ) {

    $post_types[] = 'my_custom_post_type';

    return $post_types;
}

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Author: Bueltge