package com.jcomeau.cestart;
import ewex.registry.*;
import ewe.sys.Vm;

public class Start {
 public static String commandString(String filename) {
  String extension = null;
  RegistryKey extensionKey = null;
  int rootKey = Registry.HKEY_CLASSES_ROOT;
  String command = null;
  try {
   extension = filename.substring(filename.lastIndexOf('.'));
   Vm.debug("extension=" + extension);
   extensionKey = Registry.getLocalKey(rootKey, extension, false, false);
   Vm.debug("extensionKey=" + extensionKey);
   if (extensionKey == null) throw
    new Exception("invalid key for extension " + extension);
   command = (String)Registry.getLocalKey(rootKey,
    extensionKey.getValue(null) +
    "\\Shell\\Open\\Command", false, false).getValue(null);
   return command;
  } catch (Exception ignored) {
   Vm.debug("caught: " + ignored);
   return null;
  }
 }
 public static boolean start(String program, String args) {
  ewe.sys.Process process = null;
  String command = commandString(program);
  int errorlevel = 0;
  Vm.debug("program: " + program + ", args: " + args);
  Vm.debug("command: " + command);
  if (command != null) {
   try {
    command = fixup(command, program, args);
    process = Vm.exec(command);
    process.waitFor();
    if ((errorlevel = process.exitValue()) > 0) throw new Exception(
     "Process failed with errorlevel " + errorlevel);
   } catch (Exception ignored) {
    Vm.debug("Failed executing '" + command + "': " + ignored);
    return false;
   }
  } else return false;
  return true;
 }
 public static String join(String joint, int start, String[] parts) {
  String joined = parts[start];
  for (int i = start + 1; i < parts.length; i++) {
   joined = joined + joint + parts[i];
  }
  return joined;
 }
 public static String replace(String source,
  String variable, String replacement) {
  int index = 0;
  String result = source;
  while ((index = result.indexOf(variable)) >= 0) {
   result = result.substring(0, index) + replacement +
    result.substring(index + variable.length());
  }
  return result;
 }
 public static String fixup(String command,
  String filename, String args) {
  String result = command;
  result = replace(result, "%1", filename);
  result = replace(result, "%*", args);
  return result;
 }
 public static void main(String[] args) {
  Vm.startEwe(args);
  Vm.debug("Platform: " + Vm.getPlatform() + ", Debugging: " +
   Vm.getProperty("DEBUGGING", "false"));
  Vm.debug("args: " + args.length + ": " + args);
  if (args.length == 1) {
   start(args[0], null);
  } else if (args.length > 1) {
   start(args[0], join(" ", 1, args));
  } else {
   Vm.debug("Usage: Start filename.ext [ARG [...]]");
  }
  if (Vm.getPlatform() != "Win32" ||
   Vm.getProperty("DEBUGGING", null) == null) Vm.exit(0);
 }
}