Add auto create storage feature

Author: mario7lorenzo

docs/README.md

@@ -25,8 +25,6 @@ GUI.
 ## Requirements
 - Duke runs in Java 11 or later.
 - The `.jar` file of Duke can be found [here](https://github.com/mario7lorenzo/duke/releases)
-- Make sure you have created `./data` directory, and the directory path is relative to the `.jar`
-file, with three files: `archive.txt`, `notes.txt`, and `tasks.txt` inside the `./data` directory.
 
 ## Features 
 ### Interactive GUI
@@ -120,6 +118,7 @@ regarding to archives are listed below:
 - `archive-list`<br>Displays all the archived tasks.
 - `archive-add [task-index]`<br>Moves the task of a given index in the list to the archive.
 - `archive-delete [archived-task-index]`<br>Deletes the task permanently from the archive.
+- `unarchive [archived-task-index]`<br>Unarchives the task from the archive.
 
 Example of usage:
 - `archive-list`<br>
@@ -128,6 +127,8 @@ Duke will list all the archived tasks.
 Duke will move the first task in the current list to the archive.
 - `archive-delete 1`<br>
 Duke will delete the first task in the archived task list from the archive.
+- `unarchive 1`<br>
+Duke will unarchive the first task in the archived list.
 
 ###Notes
 Duke can memorize random notes from the user. The commands regarding to notes are listed below:

src/main/java/Driver.java

@@ -29,7 +29,7 @@
  */
 
 public class Driver extends Application {
-    private final String STAGE_TITLE = "Duke";
+    private static final String STAGE_TITLE = "Duke";
     private static final String BYE_STRING = "bye";
     /**
      * The main method runs the program.

src/main/java/Duke.java

@@ -11,6 +11,8 @@
 import duke.util.Task;
 import duke.util.TaskList;
 
+import java.io.File;
+import java.io.IOException;
 import java.util.ArrayList;
 
 /*
@@ -35,10 +37,13 @@ public class Duke {
     private ArchiveList archiveList;
     private Storage taskStorage;
     private Storage archiveStorage;
-    private Storage storage;
     private NoteStorage noteStorage;
     private NoteList noteList;
     private Parser parser;
+    private static final String DATA_DIRECTORY = "./data";
+    private static final String TASK_DIRECTORY = "./data/tasks.txt";
+    private static final String ARCHIVE_DIRECTORY = "./data/archive.txt";
+    private static final String NOTES_DIRECTORY = "./data/notes.txt";
 
     /**
      * Constructs the Duke instance that has a list that
@@ -68,9 +73,10 @@ private Duke(TaskList taskList, ArchiveList archiveList,
      */
 
     public static Duke start() throws DukeInvalidTaskFormatException, DukeInvalidDateFormatException {
-        Storage taskStorage = new Storage("./data/tasks.txt");
-        Storage archiveStorage = new Storage("./data/archive.txt");
-        NoteStorage noteStorage = new NoteStorage("./data/notes.txt");
+        setStorage();
+        Storage taskStorage = new Storage(TASK_DIRECTORY);
+        Storage archiveStorage = new Storage(ARCHIVE_DIRECTORY);
+        NoteStorage noteStorage = new NoteStorage(NOTES_DIRECTORY);
         ArrayList<Task> tasks = new ArrayList<>();
         ArrayList<Task> archives = new ArrayList<>();
         ArrayList<Note> notes = new ArrayList<>();
@@ -115,4 +121,73 @@ public String processCommand(String commands) {
             return exc.getMessage();
         }
     }
+
+    /**
+     * Sets up the storage for Duke to read and write the contents.
+     */
+
+    private static void setStorage() {
+        createDataDirectory();
+        createTaskFile();
+        createArchiveFile();
+        createNoteFile();
+    }
+    /**
+     * Creates the data directory if it is not exist yet.
+     */
+
+    private static void createDataDirectory() {
+        File file = new File(DATA_DIRECTORY);
+        if (!file.exists()) {
+            file.mkdir();
+        }
+    }
+
+    /**
+     * Creates the tasks.txt file inside the data directory if not exist yet.
+     */
+
+    private static void createTaskFile() {
+        File file = new File(TASK_DIRECTORY);
+        if (!file.exists()) {
+            try {
+                file.createNewFile();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+
+        }
+    }
+
+    /**
+     * Creates the archive.txt file inside the data directory if not exist yet.
+     */
+
+    private static void createArchiveFile() {
+        File file = new File(ARCHIVE_DIRECTORY);
+        if (!file.exists()) {
+            try {
+                file.createNewFile();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+
+        }
+    }
+
+    /**
+     * Creates the notes.txt file inside the data directory if not exist yet.
+     */
+
+    private static void createNoteFile() {
+        File file = new File(NOTES_DIRECTORY);
+        if (!file.exists()) {
+            try {
+                file.createNewFile();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+
+        }
+    }
 }