B-Reminders

Add reminders command to show nearest deadline or event.

src/main/java/duke/Parser.java

@@ -7,6 +7,7 @@
 import duke.command.FindCommand;
 import duke.command.ListCommand;
 import duke.command.MarkCommand;
+import duke.command.ReminderCommand;
 import duke.command.UnmarkCommand;
 import duke.exception.DukeException;
 
@@ -41,6 +42,8 @@ public static Command parse(String userInput) throws DukeException {
             return new DeleteCommand();
         case "find":
             return new FindCommand();
+        case "reminders":
+            return new ReminderCommand();
         default:
             throw new DukeException("Unknown Command!");
         }

src/main/java/duke/TaskList.java

@@ -6,6 +6,8 @@
 import java.util.ArrayList;
 
 import duke.exception.DukeException;
+import duke.task.Deadline;
+import duke.task.Event;
 import duke.task.Task;
 
 
@@ -145,4 +147,22 @@ public String find(String keyword) {
         }
         return stringBuilder.toString();
     }
+
+    /**
+     * Find the nearest deadline or event.
+     *
+     * @return list of the nearest task.
+     * @throws DukeException
+     */
+    public String findNearest() {
+
+        StringBuilder stringBuilder = new StringBuilder();
+        for (int i = 0; i < tasks.size(); i++) {
+            if (tasks.get(i) instanceof Deadline || tasks.get(i) instanceof Event) {
+                stringBuilder.append(i + 1).append(".").append(tasks.get(i).toString());
+                break;
+            }
+        }
+        return stringBuilder.toString();
+    }
 }

src/main/java/duke/command/ReminderCommand.java

@@ -0,0 +1,29 @@
+package duke.command;
+
+import duke.TaskList;
+import duke.Ui;
+import duke.exception.DukeException;
+
+/**
+ * FindCommand to search for a task in the taskList.
+ */
+public class ReminderCommand implements Command {
+
+    /**
+     * Find the nearest dated task.
+     * @param tasks The task list that may be modified by the command.
+     * @param ui    The user interface for analyzing chat history.
+     * @return false as it should not exit.
+     * @throws DukeException when error occurs.
+     */
+    @Override
+    public boolean execute(TaskList tasks, Ui ui) throws DukeException {
+        String output = tasks.findNearest();
+        if (output.trim().length() == 0) {
+            ui.respond("You don't have any events or deadlines.");
+        } else {
+            ui.respond("Reminder: your upcoming task:" + "\n" + tasks.findNearest());
+        }
+        return false;
+    }
+}