Delete temporary sketch copy after build

When a sketch has unsaved changes, a temporary copy of the sketch is
made with those changes applied. This copy is then passed to
arduino-builder.

Previously, this temporary copy was kept around and only deleted when
the IDE was closed. However, all files were written to it again on every
build, so keeping the old files around did not serve any real purpose.

When a file was renamed in the IDE, the original name would still be
present in the temporary copy, and could cause linker errors because
both were compiled.

This commit makes sure the temporary copy is deleted after every build,
instead of at IDE exit, which fixes this problem with renames.

When a file is deleted from the sketch, the file would also be deleted
from the temporary copy, presumably to fix this same problem for
deletes (but renames were forgotten). With this commit, this special
handling for deleting files is no longer needed, so it is removed.

This fixes arduino#4335

Author: matthijskooijman

Diff for: app/src/processing/app/Sketch.java

@@ -26,7 +26,6 @@
 import cc.arduino.Compiler;
 import cc.arduino.CompilerProgressListener;
 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;
@@ -463,7 +462,7 @@ public void handleDeleteCode() throws IOException {
 
       } else {
         // delete the file
-        if (!current.getCode().deleteFile(BaseNoGui.getBuildFolder(data).toPath(), Paths.get(System.getProperty("java.io.tmpdir"), "arduino_" + DigestUtils.md5Hex(getMainFilePath())))) {
+        if (!current.getCode().deleteFile(BaseNoGui.getBuildFolder(data).toPath())) {
           Base.showMessage(tr("Couldn't do it"),
                            I18n.format(tr("Could not delete \"{0}\"."), current.getCode().getFileName()));
           return;
@@ -1100,17 +1099,27 @@ private String build(String buildPath, boolean verbose, boolean save) throws Run
 
     CompilerProgressListener progressListener = editor.status::progressUpdate;
 
+    boolean deleteTemp = false;
     String pathToSketch = data.getMainFilePath();
     if (isModified()) {
+      // If any files are modified, make a copy of the sketch with the changes
+      // saved, so arduino-builder will see the modifications.
       pathToSketch = saveSketchInTempFolder();
+      deleteTemp = true;
     }
 
-    return new Compiler(pathToSketch, data, buildPath).build(progressListener, save);
+    try {
+      return new Compiler(pathToSketch, data, buildPath).build(progressListener,
+                                                               save);
+    } finally {
+      // Make sure we clean up any temporary sketch copy
+      if (deleteTemp)
+        FileUtils.recursiveDelete(new File(pathToSketch).getParentFile());
+    }
   }
 
   private String saveSketchInTempFolder() throws IOException {
     File tempFolder = FileUtils.createTempFolder("arduino_", DigestUtils.md5Hex(data.getMainFilePath()));
-    DeleteFilesOnShutdown.add(tempFolder);
     FileUtils.copy(getFolder(), tempFolder);
 
     for (SketchCode sc : Stream.of(data.getCodes()).filter(SketchCode::isModified).collect(Collectors.toList())) {

Diff for: arduino-core/src/processing/app/SketchCode.java

@@ -91,14 +91,13 @@ protected boolean fileReadOnly() {
   }
 
 
-  protected boolean deleteFile(Path tempBuildFolder, Path tempUnsavedSketchPath) throws IOException {
+  protected boolean deleteFile(Path tempBuildFolder) throws IOException {
     if (!file.delete()) {
       return false;
     }
 
-    List<Path> tempBuildFolders = Stream.of(tempBuildFolder, tempBuildFolder.resolve("sketch"), tempUnsavedSketchPath)
-      .filter(path -> Files.exists(path))
-      .collect(Collectors.toList());
+    List<Path> tempBuildFolders = Stream.of(tempBuildFolder, tempBuildFolder.resolve("sketch"))
+        .filter(path -> Files.exists(path)).collect(Collectors.toList());
 
     for (Path folder : tempBuildFolders) {
       if (!deleteCompiledFilesFrom(folder)) {