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var _ = require('lodash');
var Promise = require('../utils/promise');
var BookPlugin = require('./plugin');
var registry = require('./registry');
/*
PluginsManager is an interface to work with multiple plugins at once:
- Extract assets from plugins
- Call hooks for all plugins, etc
*/
function PluginsManager(book) {
this.book = book;
this.log = this.book.log;
this.plugins = [];
_.bindAll(this);
}
// Return count of plugins loaded
PluginsManager.prototype.count = function() {
return _.size(this.plugins);
};
// Returns a plugin by its name
PluginsManager.prototype.get = function(name) {
return _.find(this.plugins, {
id: name
});
};
// Load a plugin, or a list of plugins
PluginsManager.prototype.load = function(name) {
var that = this;
if (_.isArray(name)) {
return Promise.serie(name, function(_name) {
return that.load(_name);
});
}
return Promise()
// Initiate and load the plugin
.then(function() {
var plugin;
if (!_.isString(name)) plugin = name;
else plugin = new BookPlugin(that.book, name);
if (that.get(plugin.id)) {
throw new Error('Plugin "'+plugin.id+'" is already loaded');
}
if (plugin.isLoaded()) return plugin;
else return plugin.load()
.thenResolve(plugin);
})
// Setup the plugin
.then(this._setup);
};
// Load all plugins from the book's configuration
PluginsManager.prototype.loadAll = function() {
var plugins = _.pluck(this.book.config.get('plugins'), 'name');
this.log.info.ln('installing', plugins.length, 'plugins');
return this.load(plugins);
};
// Setup a plugin
// Register its filter, blocks, etc
PluginsManager.prototype._setup = function(plugin) {
this.plugins.push(plugin);
};
// Install all plugins for the book
PluginsManager.prototype.install = function() {
var that = this;
var plugins = _.filter(this.book.config.get('plugins'), {
isDefault: false
});
if (plugins.length == 0) {
this.log.info.ln('nothing to install!');
return Promise(0);
}
this.log.info.ln('installing', plugins.length, 'plugins');
return Promise.serie(plugins, function(plugin) {
return registry.install(that.book, plugin.name, plugin.version);
})
.thenResolve(plugins.length);
};
// Call a hook on all plugins to transform an input
PluginsManager.prototype.hook = function(name, input) {
return Promise.reduce(this.plugins, function(current, plugin) {
return plugin.hook(name, current);
}, input);
};
module.exports = PluginsManager;
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