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var _ = require('lodash');
var path = require('path');
var resolve = require('resolve');
var Promise = require('../utils/promise');
var gitbook = require('../gitbook');
var registry = require('./registry');
function BookPlugin(book, pluginId) {
this.book = book;
this.log = this.book.log;
this.id = pluginId;
this.npmId = registry.npmId(pluginId);
this.baseDir;
this.packageInfos = undefined;
this.content = undefined;
_.bindAll(this);
}
// 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 p = Promise.some([
this.book.resolve('node_modules'),
__dirname
], function(baseDir) {
// Locate plugin and load pacjage.json
try {
var res = resolve.sync(that.npmId + '/package.json', { basedir: baseDir });
that.baseDir = path.dirname(res);
that.packageInfos = require(res);
} catch (err) {
// Wait on https://github.com/substack/node-resolve/pull/81 to be merged
if (err.message.indexOf('Cannot find module') < 0) throw err;
that.packageInfos = undefined;
that.content = undefined;
return false;
}
// Load plugin JS content
that.content = require(resolve.sync(that.npmId, { basedir: baseDir }));
return true;
})
.then(that.validate);
this.log.info('Loading plugin "' + this.id + '" ...');
return this.log.info.promise(p);
};
// Verify the definition of a plugin
// Also verify that the plugin accepts the current gitbook version
// This method throws erros if plugin is invalid
BookPlugin.prototype.validate = function() {
var isValid = (
this.packageInfos &&
this.packageInfos.name &&
this.packageInfos.engines &&
this.packageInfos.engines.gitbook
);
if (!this.isLoaded()) {
throw new Error('Couldn\'t locate plugin "' + this.id + '", Run \'gitbook install\' to install plugins from registry.');
}
if (!isValid) {
throw new Error('Invalid plugin "' + this.id + '"');
}
if (!gitbook.satisfies(this.packageInfos.engines.gitbook)) {
throw new Error('GitBook doesn\'t satisfy the requirements of this plugin: '+this.packageInfos.engines.gitbook);
}
};
module.exports = BookPlugin;
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