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index.js
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index.js
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'use strict';
var path = require('path');
var utils = require('./utils');
module.exports = function(options) {
return function fn(app) {
plugin(options).call(this, app);
if (this.isApp) {
return fn;
}
};
};
function plugin(options) {
return function(app) {
if (!utils.isValid(app, 'base-pipeline', ['app', 'collection'])) return;
this.use(utils.option());
this.plugins = this.plugins || {};
/**
* Register a plugin by `name`
*
* @param {String} `name`
* @param {Function} `fn`
* @api public
*/
this.define('plugin', function(name, options, fn) {
if (typeof name !== 'string') {
throw new TypeError('expected plugin name to be a string');
}
var args = [].slice.call(arguments, 1);
fn = args.pop();
options = args.length ? args.pop() : {};
if (typeof fn !== 'function' && !isStream(fn)) {
options = fn;
return normalize(this, name, options);
}
if (typeof options === 'function' || isStream(options)) {
fn = options;
options = {};
}
this.option(['plugin', name], options || {});
this.plugins[name] = fn;
return this;
});
/**
* Create a plugin pipeline from an array of plugins.
*
* @param {Array} `plugins` Each plugin is a function that returns a stream,
* or the name of a registered plugin.
* @param {Object} `options`
* @return {Stream}
* @api public
*/
this.define('pipeline', function(plugins, options) {
if (isStream(plugins)) return plugins;
if (isPlugins(plugins)) {
plugins = [].concat.apply([], [].slice.call(arguments));
if (utils.typeOf(plugins[plugins.length - 1]) === 'object') {
options = plugins.pop();
} else {
options = {};
}
}
if (utils.typeOf(plugins) === 'object') {
options = plugins;
plugins = null;
}
if (!plugins) {
plugins = Object.keys(this.plugins);
}
var len = plugins.length;
var idx = -1;
var res = [];
var pass = utils.through.obj();
pass.resume();
res.push(pass);
while (++idx < len) {
var plugin = normalize(this, plugins[idx], options);
if (!plugin) continue;
res.push(plugin);
}
var stream = utils.combine(res);
stream.on('error', this.emit.bind(this, 'error'));
return stream;
});
};
}
function normalize(app, val, options) {
if (typeof val === 'string' && app.plugins.hasOwnProperty(val)) {
if (isDisabled(app, 'plugin', val)) return null;
var name = path.basename(val, path.extname(val));
var opts = utils.extend({}, app.option(['plugin', name]), options);
return normalize(app, app.plugins[val], opts);
}
if (typeof val === 'function') {
return val.call(app, options, utils.through.obj());
}
if (isStream(val)) {
return val;
}
return null;
}
/**
* Returns true if the plugin is disabled.
*/
function isDisabled(app, key, prop) {
// key + '.plugin'
if (app.isFalse([key, prop])) {
return true;
}
// key + '.plugin.disable'
if (app.isTrue([key, prop, 'disable'])) {
return true;
}
return false;
};
function isStream(val) {
return val && typeof val === 'object'
&& typeof val.pipe === 'function';
}
function isPlugins(val) {
return Array.isArray(val)
|| typeof val === 'function'
|| typeof val === 'string';
}