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var path = require('path');
var resolve = require('resolve');
var Promise = require('../utils/promise');
var PLUGIN_PREFIX = 'gitbook-plugin-';
// Return an absolute name for the plugin (the one on NPM)
function npmId(name) {
if (name.indexOf(PLUGIN_PREFIX) === 0) return name;
return [PLUGIN_PREFIX, name].join('');
}
function BookPlugin(book, pluginId) {
this.book = book;
this.log = this.book.log;
this.id = pluginId;
this.npmId = npmId(pluginId);
this.baseDir;
this.packageInfos = undefined;
this.content = undefined;
}
// Return true if plugin has been loaded correctly
BookPlugin.prototype.isLoaded = function() {
return Boolean(this.packageInfos && this.content);
};
// Load this plugin
BookPlugin.prototype.load = function() {
var that = this;
if (this.isLoaded()) {
return Promise.reject(new Error('Plugin "' + this.id + '" is already loaded'));
}
// Try loading plugins from different location
var promise = Promise.some([
this.book.resolve('node_modules'),
__dirname
], function(baseDir) {
// Locate plugin and load pacjage.json
try {
var res = resolve.sync(name + '/package.json', { basedir: baseDir });
that.baseDir = path.dirname(res);
that.packageInfos = require(res);
} catch (err) {
if (err.code != 'MODULE_NOT_FOUND') throw err;
that.packageInfos = undefined;
that.content = undefined;
return false;
}
// Load plugin JS content
that.content = require(resolve.sync(name, { basedir: baseDir }));
return true;
})
.then(function() {
if (!that.isLoaded()) {
throw new Error('Couldn\'t locate plugin "' + that.id + '", Run \'gitbook install\' to install plugins from registry.');
}
});
this.log.info.log('Loading plugin "' + this.id + '" ...');
return this.log.info.promise('', promise);
};
module.exports = BookPlugin;
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