Week 6 [from Wed Feb 12 noon] - Project

Level 6. Delete

Add support for deleting tasks from the list.

Example:

list
    ____________________________________________________________
     Here are the tasks in your list:
     1.[T][✓] read book
     2.[D][✓] return book (by: June 6th)
     3.[E][✗] project meeting (at: Aug 6th 2-4pm)
     4.[T][✓] join sports club
     5.[T][✗] borrow book
    ____________________________________________________________

delete 3
    ____________________________________________________________
     Noted. I've removed this task: 
       [E][✗] project meeting (at: Aug 6th 2-4pm)
     Now you have 4 tasks in the list.
    ____________________________________________________________

Level 7. Save

Save the tasks in the hard disk automatically whenever the task list changes. Load the data from the hard disk when Duke starts up. You may hard-code the file name and location e.g., [project_root]/data/duke.txt

The format of the file is up to you. Example:

T | 1 | read book
D | 0 | return book | June 6th
E | 0 | project meeting | Aug 6th 2-4pm
T | 1 | join sports club

If you use file paths in your code,

• remember to use relative paths rather than absolute paths such as C:\data. If not, your app can cause unpredictable results when used in another computer.
• remember to specify file paths in an OS-independent way. If not, your app might not work when used on a different OS.

Your code must handle the case where the file doesn't exist at the start. Reason: when someone else takes your Duke and runs it for the first time, the required file might not exist in their computer. Similarly, if you expect the data file to be in as specific folder (e.g., ./data/), you must also handle the 'folder does not exist yet' case.

Package the app as an executable JAR file so that it can be distributed easily.

You can assume the user will run the jar file in the following way only:

• Copy the jar file into an empty folder
• Open a command window in that folder
• Run the command java -jar {filename}.jar e.g., java -jar Duke.jar (i.e., run the command in the same folder as the jar file)

Do not commit the JAR file created. Instead, you can make the JAR file available in the following manner.

• Go to your fork on GitHub and create a new release.
• In the page where you fill the details of th release,
  • give an appropriate version number e.g., v0.1
  • attach the JAR file where it says Attach binaries by dropping them ....

If you are using Gradle for your project, refer to the Gradle tutorial at the Duke repo (i.e., the repo you forked from) to find how to create a jar file using Gradle.