src/Composer/Util/Platform.php
public static function expandPath($path)
    {
        if (preg_match('#^~[\\/]#', $path)) {
            return self::getUserDirectory() . substr($path, 1);
        }

        return preg_replace_callback('#^(\$|(?P<percent>%))(?P<var>\w++)(?(percent)%)(?P<path>.*)#', function ($matches) {
            // Treat HOME as an alias for USERPROFILE on Windows for legacy reasons
            if (Platform::isWindows() && $matches['var'] == 'HOME') {
                return (getenv('HOME') ?: getenv('USERPROFILE')) . $matches['path'];
            }

            return getenv($matches['var']) . $matches['path'];
        }, $path);
    }
public static function expandPath($path)
    {
        if (preg_match('#^~[\\/]#', $path)) {
            return self::getUserDirectory() . substr($path, 1);
        }

        return preg_replace_callback('#^(\$|(?P<percent>%))(?P<var>\w++)(?(percent)%)(?P<path>.*)#', function ($matches) {
            // Treat HOME as an alias for USERPROFILE on Windows for legacy reasons
            if (Platform::isWindows() && $matches['var'] == 'HOME') {
                return (getenv('HOME') ?: getenv('USERPROFILE')) . $matches['path'];
            }

            return getenv($matches['var']) . $matches['path'];
        }, $path);
    }
public static function expandPath ( $ path ) { if ( preg_match ( '#^~[\\/]#' , $ path ) ) { return self :: getUserDirectory ( ) . substr ( $ path , 1 ) ; } return preg_replace_callback ( '#^(\$|(?P<percent>%))(?P<var>\w++)(?(percent)%)(?P<path>.*)#' , function ( $ matches ) { // Treat HOME as an alias for USERPROFILE on Windows for legacy reasons if ( Platform :: isWindows ( ) && $ matches [ 'var' ] == 'HOME' ) { return ( getenv ( 'HOME' ) ? : getenv ( 'USERPROFILE' ) ) . $ matches [ 'path' ] ; } return getenv ( $ matches [ 'var' ] ) . $ matches [ 'path' ] ; } , $ path ) ; }
Parses tildes and environment variables in paths.

@param  string $path
@return string
Parses tildes and environment variables in paths .