42 lines
1 KiB
JavaScript
42 lines
1 KiB
JavaScript
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var fs = require('fs')
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var path = require('path')
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var assign = require('./assign')
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var YError = require('./yerror')
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var previouslyVisitedConfigs = []
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function checkForCircularExtends (path) {
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if (previouslyVisitedConfigs.indexOf(path) > -1) {
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throw new YError("Circular extended configurations: '" + path + "'.")
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}
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}
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function getPathToDefaultConfig (cwd, pathToExtend) {
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return path.resolve(cwd, pathToExtend)
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}
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function applyExtends (config, cwd, subKey) {
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var defaultConfig = {}
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if (config.hasOwnProperty('extends')) {
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var pathToDefault = getPathToDefaultConfig(cwd, config.extends)
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checkForCircularExtends(pathToDefault)
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previouslyVisitedConfigs.push(pathToDefault)
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delete config.extends
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defaultConfig = JSON.parse(fs.readFileSync(pathToDefault, 'utf8'))
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if (subKey) {
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defaultConfig = defaultConfig[subKey] || {}
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}
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defaultConfig = applyExtends(defaultConfig, path.dirname(pathToDefault), subKey)
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}
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previouslyVisitedConfigs = []
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return assign(defaultConfig, config)
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}
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module.exports = applyExtends
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