Portable Arduino

Use Arduino on USB flash stick and without affecting anything on your PC.

To use this feature, simply make a folder named "portable" in the application
root folder where there are "hardware", "examples", "lib" and others.
In this mode, file association setting is disabled in the preferences dialog.

The sketch book folder is inside the "portable" folder. This may be confusing
especially for Mac OSX "Arduino.app" folder.

app/src/processing/app/Base.java

@@ -111,6 +111,9 @@ public class Base {
   List<Editor> editors = Collections.synchronizedList(new ArrayList<Editor>());
   Editor activeEditor;
 
+  static File portableFolder = null;
+  static final String portableSketchbookFolder = "sketchbook";
+
 
   static public void main(String args[]) throws Exception {
     initPlatform();
@@ -156,6 +159,13 @@ public class Base {
     }
     */
 
+    initPlatform();
+
+    // Portable folder
+    portableFolder = getContentFile("portable");
+    if (!portableFolder.exists())
+      portableFolder = null;
+
 //    // Set the look and feel before opening the window
 //    try {
 //      platform.setLookAndFeel();
@@ -249,8 +259,12 @@ public class Base {
     // If a value is at least set, first check to see if the folder exists.
     // If it doesn't, warn the user that the sketchbook folder is being reset.
     if (sketchbookPath != null) {
-      File skechbookFolder = new File(sketchbookPath);
-      if (!skechbookFolder.exists()) {
+      File sketchbookFolder;
+      if (portableFolder != null)
+	sketchbookFolder = new File(portableFolder, sketchbookPath);
+      else
+	sketchbookFolder = new File(sketchbookPath);
+      if (!sketchbookFolder.exists()) {
         Base.showWarning(_("Sketchbook folder disappeared"),
                          _("The sketchbook folder no longer exists.\n" +
                            "Arduino will switch to the default sketchbook\n" +
@@ -264,7 +278,10 @@ public class Base {
     // If no path is set, get the default sketchbook folder for this platform
     if (sketchbookPath == null) {
       File defaultFolder = getDefaultSketchbookFolder();
-      Preferences.set("sketchbook.path", defaultFolder.getAbsolutePath());
+      if (portableFolder != null)
+	Preferences.set("sketchbook.path", portableSketchbookFolder);
+      else
+	Preferences.set("sketchbook.path", defaultFolder.getAbsolutePath());
       if (!defaultFolder.exists()) {
         defaultFolder.mkdirs();
       }
@@ -422,6 +439,15 @@ public class Base {
     int opened = 0;
     for (int i = 0; i < count; i++) {
       String path = Preferences.get("last.sketch" + i + ".path");
+      if (portableFolder != null) {
+	File absolute = new File(portableFolder, path);
+	try {
+	  path = absolute.getCanonicalPath();
+	}
+	catch (IOException e) {
+	  // path unchanged.
+	}
+      }
       int[] location;
       if (windowPositionValid) {
         String locationStr = Preferences.get("last.sketch" + i + ".location");
@@ -460,6 +486,11 @@ public class Base {
           !editor.getSketch().isModified()) {
         continue;
       }
+      if (portableFolder != null) {
+	path = RelativePath.relativePath(portableFolder.toString(), path);
+	if (path == null)
+	  continue;
+      }
       Preferences.set("last.sketch" + index + ".path", path);
 
       int[] location = editor.getPlacement();
@@ -478,6 +509,11 @@ public class Base {
     String untitledPath = untitledFolder.getAbsolutePath();
     if (path.startsWith(untitledPath)) {
       path = "";
+    } else
+    if (portableFolder != null) {
+      path = RelativePath.relativePath(portableFolder.toString(), path);
+      if (path == null)
+	path = "";
     }
     Preferences.set("last.sketch" + index + ".path", path);
   }
@@ -1759,6 +1795,9 @@ public class Base {
 
 
   static public File getSettingsFolder() {
+    if (portableFolder != null)
+      return portableFolder;
+
     File settingsFolder = null;
 
     String preferencesPath = Preferences.get("settings.path");
@@ -1938,7 +1977,19 @@ public class Base {
     return boardPreferences;
   }
 
+  static public File getPortableFolder() {
+    return portableFolder;
+  }
+
+
+  static public String getPortableSketchbookFolder() {
+    return portableSketchbookFolder;
+  }
+
+
   static public File getSketchbookFolder() {
+    if (portableFolder != null)
+      return new File(portableFolder, Preferences.get("sketchbook.path"));
     return new File(Preferences.get("sketchbook.path"));
   }
 
@@ -1971,6 +2022,9 @@ public class Base {
 
 
   protected File getDefaultSketchbookFolder() {
+    if (portableFolder != null)
+      return new File(portableFolder, portableSketchbookFolder);
+
     File sketchbookFolder = null;
     try {
       sketchbookFolder = platform.getDefaultSketchbookFolder();

app/src/processing/app/Preferences.java

@@ -326,7 +326,14 @@ public class Preferences {
           File file =
             Base.selectFolder(_("Select new sketchbook location"), dflt, dialog);
           if (file != null) {
-            sketchbookLocationField.setText(file.getAbsolutePath());
+	    String path = file.getAbsolutePath();
+	    if (Base.getPortableFolder() != null) {
+	      path = RelativePath.relativePath(Base.getPortableFolder().toString(), path);
+	      if (path == null) {
+		path = Base.getPortableSketchbookFolder();
+	      }
+	    }
+	    sketchbookLocationField.setText(path);
           }
         }
       });
@@ -439,6 +446,10 @@ public class Preferences {
       autoAssociateBox.setBounds(left, top, d.width + 10, d.height);
       right = Math.max(right, left + d.width);
       top += d.height + GUI_BETWEEN;
+
+      // If using portable mode, it's bad manner to change PC setting.
+      if (Base.getPortableFolder() != null)
+	autoAssociateBox.setEnabled(false);
     }
 
     // More preferences are in the ...
@@ -591,6 +602,12 @@ public class Preferences {
     // if the sketchbook path has changed, rebuild the menus
     String oldPath = get("sketchbook.path");
     String newPath = sketchbookLocationField.getText();
+    if (newPath.isEmpty()) {
+      if (Base.getPortableFolder() == null)
+	newPath = editor.base.getDefaultSketchbookFolder().toString();
+      else
+	newPath = Base.getPortableSketchbookFolder();
+    }
     if (!newPath.equals(oldPath)) {
       editor.base.rebuildSketchbookMenus();
       set("sketchbook.path", newPath);

app/src/processing/app/RelativePath.java

@@ -0,0 +1,74 @@
+/*
+ * by Shigeru KANEMOTO at SWITCHSCIENCE.
+ */
+
+package processing.app;
+
+import java.io.File;
+import java.io.IOException;
+
+class RelativePath {
+  //
+  // Compute relative path to "target" from a directory "origin".
+  //
+  // If "origin" is not absolute, it is relative from the current directory.
+  // If "target" is not absolute, it is relative from "origin".
+  //
+  public static String relativePath(String origin, String target) {
+    try {
+      origin = (new File(origin)).getCanonicalPath();
+      File targetFile = new File(target);
+      if (targetFile.isAbsolute())
+	target = targetFile.getCanonicalPath();
+      else
+	target = (new File(origin, target)).getCanonicalPath();
+    }
+    catch (IOException e) {
+      return null;
+    }
+
+    if (origin.equals(target)) {
+      // origin and target is identical.
+      return ".";
+    }
+
+    if (origin.equals(File.separator)) {
+      // origin is root.
+      return "." + target;
+    }
+
+    String prefix = "";
+    String root = File.separator;
+
+    if (System.getProperty("os.name").indexOf("Windows") != -1) {
+      if (origin.startsWith("\\\\") || target.startsWith("\\\\")) {
+	// Windows UNC path not supported.
+	return null;
+      }
+
+      char originLetter = origin.charAt(0);
+      char targetLetter = target.charAt(0);
+      if (Character.isLetter(originLetter) && Character.isLetter(targetLetter)) {
+	// Windows only
+	if (originLetter != targetLetter) {
+	  // Drive letters differ
+	  return null;
+	}
+      }
+
+      prefix = "" + originLetter + ':';
+      root = prefix + File.separator;
+    }
+
+    String relative = "";
+    while (!target.startsWith(origin + File.separator)) {
+      origin = (new File(origin)).getParent();
+      if (origin.equals(root))
+	origin = prefix;
+      relative += "..";
+      relative += File.separator;
+    }
+
+    return relative + target.substring(origin.length() + 1);
+  }
+}

app/src/processing/app/Sketch.java

@@ -826,7 +826,7 @@ public class Sketch {
                                    FileDialog.SAVE);
     if (isReadOnly() || isUntitled()) {
       // default to the sketchbook folder
-      fd.setDirectory(Preferences.get("sketchbook.path"));
+      fd.setDirectory(Base.getSketchbookFolder().getAbsolutePath());
     } else {
       // default to the parent folder of where this was
       fd.setDirectory(folder.getParent());