import java.util.*;
import java.util.zip.*;
import java.util.List;
import java.util.regex.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.*;
import java.util.concurrent.locks.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import javax.swing.table.*;
import java.io.*;
import java.net.*;
import java.lang.reflect.*;
import java.lang.ref.*;
import java.lang.management.*;
import java.security.*;
import java.security.spec.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.imageio.*;
import java.math.*;
// TODO: what to do on Windows?
class main {

static String safePlatformQuote(String s) {
  return isWindows() ? winQuote(s) : safeBashQuote(s);
}

static String safePlatformQuote(File f) {
  return safePlatformQuote(f2s(f));
}
public static boolean isWindows() {
  return System.getProperty("os.name").contains("Windows");
}


/** possibly improvable */
public static String winQuote(String text) {
  if (text == null) return null;
  return "\"" + text
    .replace("\\", "\\\\")
    .replace("\"", "\\\"")
    .replace("\n", "\\n")
    .replace("\r", "\\r") + "\"";
}

static String winQuote(File f) {
  return winQuote(f.getAbsolutePath());
}


/** possibly improvable */
static String safeBashQuote(String text) {
  if (text == null) return null;
  return "'" + text
    .replace("\\", "\\\\")
    .replace("'", "\\'")
    .replace("\n", "\\n")
    .replace("\r", "\\r") + "'";
}

static String safeBashQuote(File f) {
  return safeBashQuote(f.getAbsolutePath());
}


static String f2s(File f) {
  return f == null ? null : f.getAbsolutePath();
}

static String f2s(String s) { return f2s(newFile(s)); }


 static String f2s(java.nio.file.Path p) {
  return p == null ? null : f2s(p.toFile());
}





static File newFile(File base, String... names) {
  for (String name : names) base = new File(base, name);
  return base;
}

static File newFile(String name) {
  return name == null ? null : new File(name);
}

static File newFile(String base, String... names) {
  return newFile(newFile(base), names);
}



}