To use to programmatically install or upgrade plugins.
This will only work for plugins with a certain folder/file naming prefix. It has to look like this:
my-plugin-name/my-plugin-name.php
Will probably work for all themes, as they require a style.css file.
Initialize the plugin upgrade instance. The class takes two parameters; download url and slug. Both are required.
For plugins:
$upgrader = new Smart_Upgrader( 'http://example.com/my-plugin.zip', 'my-plugin' );
For themes:
$upgrader = new Smart_Upgrader_Theme( 'http://example.com/my-theme.zip', 'my-theme' );
To install the plugin/theme:
$upgrader->install(); // returns a boolean
To upgrade the plugin/theme:
$upgrader->upgrade(); // returns a boolean
To activate the plugin/theme:
$upgrader->activate(); // returns a boolean