Yogu/site-manager

var Q = require('q');

var hookNames = [ 'afterCheckout', 'afterPull', 'beforeBackup', 'afterRestore', 'afterUpgrade',
    'upgradeFailed', 'afterCreate', 'deletingSite', 'afterDelete', 'beforeDelete', 'reset' ];

var hooks = {};
for (var i = 0; i < hookNames.length; i++)
    hooks[hookNames[i]] = [];

/**
 * Registers a hook to be called in specific tasks
 *
 * @param string name the hook name
 * @param function(Site): Task a function that returns a task to be executed
 */
exports.register = function(name, taskBuilder) {
    if (!(name in hooks))
        throw new Error('Unrecognized hook: ' + name);

    hooks[name].push(taskBuilder);
};

exports.call = Q.async(function*(name, task, site, args) {
    if (!(name in hooks))
        throw new Error('Unrecognized hook: ' + name);

    var theHooks = hooks[name];
    if (theHooks.length === 0)
        return;

    task.doLog('Calling ' + theHooks.length + ' ' + name + ' hooks');
    for (var i = 0; i < theHooks.length; i++) {
        var subTask = theHooks[i](site, args);
        if (subTask)
            yield task.runNested(subTask);
    }
});