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<pre class="prettyprint source linenums"><code>'use strict';
const assert = require('assert');
const _ = require('lodash');
const sortKeys = require('sort-keys');
/**
* Proxy handler for Storage
*/
const proxyHandler = {
get(storage, property) {
return storage.get(property);
},
set(storage, property, value) {
storage.set(property, value);
return true;
},
ownKeys(storage) {
return Reflect.ownKeys(storage._store);
},
has(target, prop) {
return target.get(prop) !== undefined;
},
getOwnPropertyDescriptor(target, key) {
return {
get: () => this.get(target, key),
enumerable: true,
configurable: true
};
}
};
/**
* Storage instances handle a json file where Generator authors can store data.
*
* The `Generator` class instantiate the storage named `config` by default.
*
* @constructor
* @param {String} [name] The name of the new storage (this is a namespace)
* @param {mem-fs-editor} fs A mem-fs editor instance
* @param {String} configPath The filepath used as a storage.
* @param {Object} [options] Storage options.
* @param {Boolean} [options.lodashPath=false] Set true to treat name as a lodash path.
* @param {Boolean} [options.disableCache=false] Set true to disable json object cache.
* @param {Boolean} [options.disableCacheByFile=false] Set true to cleanup cache for every fs change.
* @param {Boolean} [options.sorted=false] Set true to write sorted json.
*
* @example
* class extend Generator {
* writing: function() {
* this.config.set('coffeescript', false);
* }
* }
*/
class Storage {
constructor(name, fs, configPath, options = {}) {
if (name !== undefined && typeof name !== 'string') {
configPath = fs;
fs = name;
name = undefined;
}
if (typeof options === 'boolean') {
options = {lodashPath: options};
}
_.defaults(options, {
lodashPath: false,
disableCache: false,
disableCacheByFile: false,
sorted: false
});
assert(configPath, 'A config filepath is required to create a storage');
this.path = configPath;
this.name = name;
this.fs = fs;
this.indent = 2;
this.lodashPath = options.lodashPath;
this.disableCache = options.disableCache;
this.disableCacheByFile = options.disableCacheByFile;
this.sorted = options.sorted;
this.existed = Object.keys(this._store).length > 0;
this.fs.store.on('change', (filename) => {
// At mem-fs 1.1.3 filename is not passed to the event.
if (this.disableCacheByFile || (filename && filename !== this.path)) {
return;
}
delete this._cachedStore;
});
}
/**
* Return the current store as JSON object
* @return {Object} the store content
* @private
*/
get _store() {
const store = this._cachedStore || this.fs.readJSON(this.path, {});
if (!this.disableCache) {
this._cachedStore = store;
}
if (!this.name) {
return store || {};
}
return (this.lodashPath ? _.get(store, this.name) : store[this.name]) || {};
}
/**
* Persist a configuration to disk
* @param {Object} val - current configuration values
* @private
*/
_persist(value) {
if (this.sorted) {
value = sortKeys(value, {deep: true});
}
let fullStore;
if (this.name) {
fullStore = this.fs.readJSON(this.path, {});
if (this.lodashPath) {
_.set(fullStore, this.name, value);
} else {
fullStore[this.name] = value;
}
} else {
fullStore = value;
}
this.fs.writeJSON(this.path, fullStore, null, this.indent);
}
/**
* Save a new object of values
*/
save() {
this._persist(this._store);
}
/**
* Get a stored value
* @param {String} key The key under which the value is stored.
* @return {*} The stored value. Any JSON valid type could be returned
*/
get(key) {
return this._store[key];
}
/**
* Get a stored value from a lodash path
* @param {String} path The path under which the value is stored.
* @return {*} The stored value. Any JSON valid type could be returned
*/
getPath(path) {
return _.get(this._store, path);
}
/**
* Get all the stored values
* @return {Object} key-value object
*/
getAll() {
return _.cloneDeep(this._store);
}
/**
* Assign a key to a value and schedule a save.
* @param {String} key The key under which the value is stored
* @param {*} val Any valid JSON type value (String, Number, Array, Object).
* @return {*} val Whatever was passed in as val.
*/
set(key, value) {
assert(!_.isFunction(value), "Storage value can't be a function");
const store = this._store;
if (_.isObject(key)) {
value = _.assignIn(store, key);
} else {
store[key] = value;
}
this._persist(store);
return value;
}
/**
* Assign a lodash path to a value and schedule a save.
* @param {String} path The key under which the value is stored
* @param {*} val Any valid JSON type value (String, Number, Array, Object).
* @return {*} val Whatever was passed in as val.
*/
setPath(path, value) {
assert(!_.isFunction(value), "Storage value can't be a function");
const store = this._store;
_.set(store, path, value);
this._persist(store);
return value;
}
/**
* Delete a key from the store and schedule a save.
* @param {String} key The key under which the value is stored.
*/
delete(key) {
const store = this._store;
delete store[key];
this._persist(store);
}
/**
* Setup the store with defaults value and schedule a save.
* If keys already exist, the initial value is kept.
* @param {Object} defaults Key-value object to store.
* @return {*} val Returns the merged options.
*/
defaults(defaults) {
assert(
_.isObject(defaults),
'Storage `defaults` method only accept objects'
);
const store = _.defaults({}, this._store, defaults);
this._persist(store);
return this.getAll();
}
/**
* @param {Object} defaults Key-value object to store.
* @return {*} val Returns the merged object.
*/
merge(source) {
assert(_.isObject(source), 'Storage `merge` method only accept objects');
const value = _.merge({}, this._store, source);
this._persist(value);
return this.getAll();
}
/**
* Create a child storage.
* @param {String} path - relative path of the key to create a new storage.
* Some paths need to be escaped. Eg: ["dotted.path"]
* @return {Storage} Returns a new Storage.
*/
createStorage(path) {
const childName = this.name ? `${this.name}.${path}` : path;
return new Storage(childName, this.fs, this.path, true);
}
/**
* Creates a proxy object.
* @return {Object} proxy.
*/
createProxy() {
return new Proxy(this, proxyHandler);
}
}
module.exports = Storage;
</code></pre>
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