'use strict'
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const path = require('path')
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const walkBack = require('walk-back')
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/**
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* A convention for storing and retrieving application config. You supply a string (e.g. `'example-app'`), the libary will walk up the directory tree merging config stored for this app. The following locations are searched, with the latter taking precedence:
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*
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* - Any package.json, beneath the `example-app` property.
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* - Any `.example-app.json` files (or a custom filename you specify).
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*
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* @module config-master
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*/
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module.exports = loadConfig
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/**
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* @param {string} - config name
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* @param [options] {object} - options
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* @param [options.startFrom] {string} - directory to begin looking for config
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* @param [options.filename] {string} - config filename (defaults to `.${configName}.json`)
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* @returns {Object}
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* @alias module:config-master
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*/
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function loadConfig (configName, options) {
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options = options || {}
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const configFileName = options.filename || `.${configName}.json`
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const startFrom = options.startFrom || process.cwd()
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const configs = Array.from(configsInTree(startFrom, configFileName)).reverse()
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const packageConfigs = Array.from(packageConfigsInTree(startFrom, configName)).reverse()
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return Object.assign.apply(null, [ {} ].concat(packageConfigs).concat(configs))
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}
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function * configsInTree (startFrom, fileName) {
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let file
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while ((file = walkBack(startFrom, fileName))) {
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yield require(file)
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startFrom = path.resolve(path.dirname(file), '..')
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}
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}
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function * packageConfigsInTree (startFrom, configName) {
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let file
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while ((file = walkBack(startFrom, 'package.json'))) {
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let config = require(file)[configName]
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if (config) yield config
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startFrom = path.resolve(path.dirname(file), '..')
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}
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}
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