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const path = require('path')
const isWindows = require('./is-windows')
module.exports = commandConvert
/**
* Converts an environment variable usage to be appropriate for the current OS
* @param {String} command Command to convert
* @param {Object} env Map of the current environment variable names and their values
* @param {boolean} normalize If the command should be normalized using `path`
* after converting
* @returns {String} Converted command
*/
function commandConvert(command, env, normalize = false) {
if (!isWindows()) {
return command
}
const envUnixRegex = /\$(\w+)|\${(\w+)}/g // $my_var or ${my_var}
const convertedCmd = command.replace(envUnixRegex, (match, $1, $2) => {
const varName = $1 || $2
// In Windows, non-existent variables are not replaced by the shell,
// so for example "echo %FOO%" will literally print the string "%FOO%", as
// opposed to printing an empty string in UNIX. See kentcdodds/cross-env#145
// If the env variable isn't defined at runtime, just strip it from the command entirely
return env[varName] ? `%${varName}%` : ''
})
// Normalization is required for commands with relative paths
// For example, `./cmd.bat`. See kentcdodds/cross-env#127
// However, it should not be done for command arguments.
// See https://github.com/kentcdodds/cross-env/pull/130#issuecomment-319887970
return normalize === true ? path.normalize(convertedCmd) : convertedCmd
}