'use strict'
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var dotenvExpand = function (config) {
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// if ignoring process.env, use a blank object
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var environment = config.ignoreProcessEnv ? {} : process.env
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var interpolate = function (envValue) {
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var matches = envValue.match(/(.?\${?(?:[a-zA-Z0-9_]+)?}?)/g) || []
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return matches.reduce(function (newEnv, match) {
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var parts = /(.?)\${?([a-zA-Z0-9_]+)?}?/g.exec(match)
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var prefix = parts[1]
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var value, replacePart
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if (prefix === '\\') {
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replacePart = parts[0]
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value = replacePart.replace('\\$', '$')
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} else {
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var key = parts[2]
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replacePart = parts[0].substring(prefix.length)
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// process.env value 'wins' over .env file's value
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value = environment.hasOwnProperty(key) ? environment[key] : (config.parsed[key] || '')
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// Resolve recursive interpolations
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value = interpolate(value)
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}
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return newEnv.replace(replacePart, value)
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}, envValue)
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}
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for (var configKey in config.parsed) {
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var value = environment.hasOwnProperty(configKey) ? environment[configKey] : config.parsed[configKey]
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config.parsed[configKey] = interpolate(value)
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}
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for (var processKey in config.parsed) {
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environment[processKey] = config.parsed[processKey]
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}
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return config
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}
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module.exports = dotenvExpand
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