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