Create a Custom WordPress Plugin From Scratch

This tutorial is from: http://code.tutsplus.com/tutorials/create-a-custom-wordpress-plugin-from-scratch-net-2668

1 Files and folders

WordPress stores its plugins in the wp-content/plugins/ folder. This is the place where we’ll be adding our files as well.

we are going to use two files (one for the main plugin file and one for implementing the administration page) therefore we’ll be putting all our files in a specific folder that we’ll name oscommerce_importer.

2. Creating the plugin file

Now we create our main plugin file. We’ll name it as itoscommerce_importer.php.

Here are two good examples to show how to add buttons to wordpress editor by build wordpress plugins.

WordPress has two different editors: TinyMCE editor(i.e., visual editor) and Text editor(i.e., HTML editor).

WordPress also lets us create custom buttons to both of the visual and text(or HTML) editor. To add a button for Text editor we need to use Quicktags API and to add buttons to the TinyMCE editor we have to use JavaScript APIs provided by the TinyMCE library. Here are two articles that will help you to learn these APIs.

Add Buttons to WordPress Text Editor

Here is an example code snippet which adds a button to the WordPress code editor and wraps the selected text using [code][/code] tags.