Faster recompilation of unsaved sketches

Author: Federico Fissore

app/src/processing/app/Sketch.java

@@ -28,6 +28,7 @@
 import cc.arduino.UploaderUtils;
 import cc.arduino.files.DeleteFilesOnShutdown;
 import cc.arduino.packages.Uploader;
+import org.apache.commons.codec.digest.DigestUtils;
 import processing.app.debug.RunnerException;
 import processing.app.forms.PasswordAuthorizationDialog;
 import processing.app.helpers.FileUtils;
@@ -1130,7 +1131,7 @@ private String build(String buildPath, boolean verbose, boolean save) throws Run
   }
 
   private String saveSketchInTempFolder() throws IOException {
-    File tempFolder = FileUtils.createTempFolder();
+    File tempFolder = FileUtils.createTempFolder("arduino_", DigestUtils.md5Hex(data.getMainFilePath()));
     DeleteFilesOnShutdown.add(tempFolder);
     FileUtils.copy(getFolder(), tempFolder);
 

arduino-core/src/cc/arduino/contributions/libraries/LibraryInstaller.java

@@ -109,7 +109,7 @@ public synchronized void install(ContributedLibrary lib, ContributedLibrary repl
     progress.setStatus(I18n.format(tr("Installing library: {0}"), lib.getName()));
     progressListener.onProgress(progress);
     File libsFolder = indexer.getSketchbookLibrariesFolder();
-    File tmpFolder = FileUtils.createTempFolderIn(libsFolder);
+    File tmpFolder = FileUtils.createTempFolder(libsFolder);
     try {
       new ArchiveExtractor(platform).extract(lib.getDownloadedFile(), tmpFolder, 1);
     } catch (Exception e) {

arduino-core/src/processing/app/helpers/FileUtils.java

@@ -3,6 +3,8 @@
 import org.apache.commons.compress.utils.IOUtils;
 
 import java.io.*;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.util.*;
 import java.util.regex.Pattern;
 
@@ -84,15 +86,27 @@ public static void recursiveDelete(File file) {
   }
 
   public static File createTempFolder() throws IOException {
-    return createTempFolderIn(new File(System.getProperty("java.io.tmpdir")));
+    return createTempFolder(new File(System.getProperty("java.io.tmpdir")));
   }
 
-  public static File createTempFolderIn(File parent) throws IOException {
-    File tmpFolder = new File(parent, "arduino_" + new Random().nextInt(1000000));
-    if (!tmpFolder.mkdir()) {
-      throw new IOException("Unable to create temp folder " + tmpFolder);
-    }
-    return tmpFolder;
+  public static File createTempFolder(File parent) throws IOException {
+    return createTempFolder(parent, "arduino_");
+  }
+
+  public static File createTempFolder(File parent, String prefix) throws IOException {
+    return createTempFolder(parent, prefix, Integer.toString(new Random().nextInt(1000000)));
+  }
+
+  public static File createTempFolder(String prefix) throws IOException {
+    return createTempFolder(new File(System.getProperty("java.io.tmpdir")), prefix);
+  }
+
+  public static File createTempFolder(String prefix, String suffix) throws IOException {
+    return createTempFolder(new File(System.getProperty("java.io.tmpdir")), prefix, suffix);
+  }
+
+  public static File createTempFolder(File parent, String prefix, String suffix) throws IOException {
+    return Files.createDirectories(Paths.get(parent.getAbsolutePath(), prefix + suffix)).toFile();
   }
 
   //