IDEA启动分析之参数预处理

private fun preprocessArgs(args: Array<String>): List<String> {
  
  if (args.isEmpty()) {
    return Collections.emptyList()
  }

  // a buggy DE may fail to strip an unused parameter from a .desktop file
  if (args.size == 1 && args[0] == "%f") {
    return Collections.emptyList()
  }

  @Suppress("SuspiciousPackagePrivateAccess")
  if (AppMode.HELP_OPTION in args) {
    println("""
        Some of the common commands and options (sorry, the full list is not yet supported):
          --help      prints a short list of commands and options
          --version   shows version information
          /project/dir
            opens a project from the given directory
          [/project/dir|--temp-project] [--wait] [--line <line>] [--column <column>] file
            opens the file, either in a context of the given project or as a temporary single-file project,
            optionally waiting until the editor tab is closed
          diff <left> <right>
            opens a diff window between <left> and <right> files/directories
          merge <local> <remote> [base] <merged>
            opens a merge window between <local> and <remote> files (with optional common <base>), saving the result to <merged>
        """.trimIndent())
    exitProcess(0)
  }

  @Suppress("SuspiciousPackagePrivateAccess")
  if (AppMode.VERSION_OPTION in args) {
    val appInfo = ApplicationInfoImpl.getShadowInstance()
    val edition = ApplicationNamesInfo.getInstance().editionName?.let { " (${it})" } ?: ""
    println("${appInfo.fullApplicationName}${edition}\nBuild #${appInfo.build.asString()}")
    exitProcess(0)
  }

  val (propertyArgs, otherArgs) = args.partition { it.startsWith("-D") && it.contains('=') }
  propertyArgs.forEach { arg ->
    val (option, value) = arg.removePrefix("-D").split('=', limit = 2)
    System.setProperty(option, value)
  }
  return otherArgs
}