Do not download completed exercises on Update

Skip those that were completed on another computer/folder

Author: juvester

src/main/java/fi/helsinki/cs/tmc/cli/command/UpdateCommand.java

@@ -81,7 +81,12 @@ private void printExercises(List<Exercise> exercises, String message) {
         if (!exercises.isEmpty()) {
             io.println(message);
             for (Exercise exercise : exercises) {
-                io.println(" " + exercise.getName());
+                if (exercise.isCompleted()) {
+                    // already released and completed on another computer/folder
+                    io.println(" " + exercise.getName() + " (already completed)");
+                } else {
+                    io.println(" " + exercise.getName());
+                }
             }
         }
     }

src/main/java/fi/helsinki/cs/tmc/cli/tmcstuff/ExerciseUpdater.java

@@ -11,6 +11,7 @@
 
 import java.nio.file.Path;
 import java.util.ArrayList;
+import java.util.Iterator;
 import java.util.List;
 
 public class ExerciseUpdater {
@@ -88,7 +89,14 @@ public boolean updatesAvailable() {
     }
 
     public List<Exercise> downloadUpdates(TmcCliProgressObserver progobs) {
-        return TmcUtil.downloadExercises(core, getNewAndUpdatedExercises(), progobs);
+        List<Exercise> newAndUpdated = getNewAndUpdatedExercises();
+        for (Iterator<Exercise> iterator = newAndUpdated.iterator(); iterator.hasNext();) {
+            Exercise next = iterator.next();
+            if (next.isCompleted()) {
+                iterator.remove();
+            }
+        }
+        return TmcUtil.downloadExercises(core, newAndUpdated, progobs);
     }
 
     public boolean updateCourseJson(CourseInfo info, Path configFile) {