import path from 'path';
import { isWindows } from "./is-windows.js";
/**
* Converts an environment variable usage to be appropriate for the current OS
* @param command Command to convert
* @param env Map of the current environment variable names and their values
* @param normalize If the command should be normalized using `path` after converting
* @returns Converted command
*/
export function commandConvert(command, env, normalize = false) {
if (!isWindows()) {
return command;
}
// Handle simple variables: $var or ${var}
const simpleEnvRegex = /\$(\w+)|\${(\w+)}/g;
// Handle bash parameter expansion with default values: ${var:-default}
const defaultValueRegex = /\$\{(\w+):-([^}]+)\}/g;
let convertedCmd = command;
// First, handle bash parameter expansion with default values
convertedCmd = convertedCmd.replace(defaultValueRegex, (match, varName, defaultValue) => {
// If the variable exists, use its value; otherwise use the default
const value = env[varName] || defaultValue;
return value;
});
// Then handle simple variable references
convertedCmd = convertedCmd.replace(simpleEnvRegex, (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;
}
