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Processing is a programming language, development environment, and online community. This PDE package contains the Processing IDE.
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/* -*- mode: java; c-basic-offset: 2; indent-tabs-mode: nil -*- */

/*
  Part of the Processing project - http://processing.org

  Copyright (c) 2012-2013 The Processing Foundation
  Copyright (c) 2008-2012 Ben Fry and Casey Reas

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software Foundation,
  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

package processing.app.platform;

import java.io.File;
import java.awt.Toolkit;

import processing.app.Base;
import processing.app.Messages;
import processing.app.Preferences;
import processing.app.platform.DefaultPlatform;
import processing.core.PApplet;


public class LinuxPlatform extends DefaultPlatform {
  String homeDir;


  public void initBase(Base base) {
    super.initBase(base);

    String javaVendor = System.getProperty("java.vendor");
    String javaVM = System.getProperty("java.vm.name");
    if (javaVendor == null ||
        (!javaVendor.contains("Sun") && !javaVendor.contains("Oracle")) ||
        javaVM == null || !javaVM.contains("Java")) {
      Messages.showWarning("Not fond of this Java VM",
                           "Processing requires Java 8 from Oracle.\n" +
                           "Other versions such as OpenJDK, IcedTea,\n" +
                           "and GCJ are strongly discouraged. Among other things, you're\n" +
                           "likely to run into problems with sketch window size and\n" +
                           "placement. For more background, please read the wiki:\n" +
                           "https://github.com/processing/processing/wiki/Supported-Platforms#linux", null);
    }

    // Set x11 WM_CLASS property which is used as the application
    // name by Gnome3 and other window managers.
    // https://github.com/processing/processing/issues/2534
    try {
      Toolkit xToolkit = Toolkit.getDefaultToolkit();
      java.lang.reflect.Field awtAppClassNameField =
        xToolkit.getClass().getDeclaredField("awtAppClassName");
      awtAppClassNameField.setAccessible(true);
      awtAppClassNameField.set(xToolkit, "Processing");

    } catch(Exception e) {
      // In case the implementation details change
      e.printStackTrace();
    }
  }


  // Java sets user.home to be /root for execution with sudo.
  // This method attempts to use the user's real home directory instead.
  public String getHomeDir() {
    if (homeDir == null) {
      // get home directory of SUDO_USER if set, else use user.home
      homeDir = System.getProperty("user.home");
      String sudoUser = System.getenv("SUDO_USER");
      if (sudoUser != null && sudoUser.length() != 0) {
        try {
          homeDir = getHomeDir(sudoUser);
        } catch (Exception e) { }
      }
    }
    return homeDir;
  }


  static public String getHomeDir(String user) throws Exception {
    Process p = PApplet.exec("/bin/sh", "-c", "echo ~" + user);
    return PApplet.createReader(p.getInputStream()).readLine();
  }


  public File getSettingsFolder() throws Exception {
    return new File(getHomeDir(), ".processing");
  }


  public File getDefaultSketchbookFolder() throws Exception {
    return new File(getHomeDir(), "sketchbook");
  }


  public void openURL(String url) throws Exception {
    if (openFolderAvailable()) {
      String launcher = Preferences.get("launcher");
      if (launcher != null) {
        Runtime.getRuntime().exec(new String[] { launcher, url });
      }
    }
  }


  public boolean openFolderAvailable() {
    if (Preferences.get("launcher") != null) {
      return true;
    }

    // Attempt to use xdg-open
    try {
      Process p = Runtime.getRuntime().exec(new String[] { "xdg-open" });
      p.waitFor();
      Preferences.set("launcher", "xdg-open");
      return true;
    } catch (Exception e) { }

    // Attempt to use gnome-open
    try {
      Process p = Runtime.getRuntime().exec(new String[] { "gnome-open" });
      p.waitFor();
      // Not installed will throw an IOException (JDK 1.4.2, Ubuntu 7.04)
      Preferences.set("launcher", "gnome-open");
      return true;
    } catch (Exception e) { }

    // Attempt with kde-open
    try {
      Process p = Runtime.getRuntime().exec(new String[] { "kde-open" });
      p.waitFor();
      Preferences.set("launcher", "kde-open");
      return true;
    } catch (Exception e) { }

    return false;
  }


  public void openFolder(File file) throws Exception {
    if (openFolderAvailable()) {
      String lunch = Preferences.get("launcher");
      try {
        String[] params = new String[] { lunch, file.getAbsolutePath() };
        //processing.core.PApplet.println(params);
        /*Process p =*/ Runtime.getRuntime().exec(params);
        /*int result =*/ //p.waitFor();
      } catch (Exception e) {
        e.printStackTrace();
      }
    } else {
      System.out.println("No launcher set, cannot open " +
                         file.getAbsolutePath());
    }
  }
}