53 lines
1.4 KiB
JavaScript
53 lines
1.4 KiB
JavaScript
var fs = require('fs')
|
|
var path = require('path')
|
|
var assign = require('./assign')
|
|
var YError = require('./yerror')
|
|
|
|
var previouslyVisitedConfigs = []
|
|
|
|
function checkForCircularExtends (path) {
|
|
if (previouslyVisitedConfigs.indexOf(path) > -1) {
|
|
throw new YError("Circular extended configurations: '" + path + "'.")
|
|
}
|
|
}
|
|
|
|
function getPathToDefaultConfig (cwd, pathToExtend) {
|
|
return path.resolve(cwd, pathToExtend)
|
|
}
|
|
|
|
function applyExtends (config, cwd) {
|
|
var defaultConfig = {}
|
|
|
|
if (config.hasOwnProperty('extends')) {
|
|
if (typeof config.extends !== 'string') return defaultConfig
|
|
var isPath = /\.json$/.test(config.extends)
|
|
var pathToDefault = null
|
|
if (!isPath) {
|
|
try {
|
|
pathToDefault = require.resolve(config.extends)
|
|
} catch (err) {
|
|
// most likely this simply isn't a module.
|
|
}
|
|
} else {
|
|
pathToDefault = getPathToDefaultConfig(cwd, config.extends)
|
|
}
|
|
// maybe the module uses key for some other reason,
|
|
// err on side of caution.
|
|
if (!pathToDefault && !isPath) return config
|
|
|
|
checkForCircularExtends(pathToDefault)
|
|
|
|
previouslyVisitedConfigs.push(pathToDefault)
|
|
|
|
defaultConfig = isPath ? JSON.parse(fs.readFileSync(pathToDefault, 'utf8')) : require(config.extends)
|
|
delete config.extends
|
|
defaultConfig = applyExtends(defaultConfig, path.dirname(pathToDefault))
|
|
}
|
|
|
|
previouslyVisitedConfigs = []
|
|
|
|
return assign(defaultConfig, config)
|
|
}
|
|
|
|
module.exports = applyExtends
|