Branch level 9

src/main/java/META-INF/MANIFEST.MF

@@ -0,0 +1,3 @@
+Manifest-Version: 1.0
+Main-Class: python.Python
+

src/main/java/python/parser/Command.java

@@ -9,6 +9,7 @@ public class Command {
     public static final String COMMAND_TODO = "todo";
     public static final String COMMAND_DEADLINE = "deadline";
     public static final String COMMAND_EVENT = "event";
+    public static final String COMMAND_FIND = "find";
 
     public static boolean isCommandBye(String command) {
         return (command.equals(COMMAND_BYE));

src/main/java/python/parser/Parser.java

@@ -13,6 +13,10 @@ public static int extractTaskNoFromInputLine(String inputLine) {
         return Integer.parseInt(inputLine.split(" ")[1]);
     }
 
+    public static String extractKeywordFromInputLine(String inputLine) {
+        return inputLine.split(" ")[1];
+    }
+
     public static String extractTodoDescFromInputLine(String inputLine) {
         return inputLine.split(" ", 2)[1];
     }

src/main/java/python/task/TaskList.java

@@ -34,4 +34,13 @@ public static void addTask(Task task) {
         tasks.add(task);
     }
 
+    public static List<Task> findTask(String keyword) {
+        List<Task> matchedTasks = new ArrayList<>();
+        for (int taskNo = 0; taskNo < getNumberOfTasks(); taskNo++) {
+            if (getTask(taskNo).getDescription().contains(keyword)) {
+                matchedTasks.add(getTask(taskNo));
+            }
+        }
+        return matchedTasks;
+    }
 }

src/main/java/python/ui/Message.java

@@ -5,6 +5,7 @@ public class Message {
     final static String MESSAGE_ASK = "What can I do for you?";
     final static String MESSAGE_BYE = "Bye. See you again when you run the program again!";
     final static String MESSAGE_INT_AFTER_COMMAND = "Command must be followed by an integer (task id)!";
+    final static String MESSAGE_KEYWORD_AFTER_COMMAND = "Command must be followed by a keyword!";
     final static String MESSAGE_DESC_AFTER_COMMAND = "Command must be followed by a task description!!";
     final static String MESSAGE_TIME_AFTER_FROM_CLAUSE =
             "Command must have /from clause followed by time it starts!";
@@ -25,4 +26,6 @@ public class Message {
     final static String MESSAGE_NEW_TODO = "New Todo! You have added this todo:";
     final static String MESSAGE_NEW_DEADLINE = "New Deadline! You have added this deadline:";
     final static String MESSAGE_NEW_EVENT = "New Event! You have added this event:";
+    final static String MESSAGE_NO_MATCH = "No matching tasks found!";
+    final static String MESSAGE_MATCHES_FOUND = "Here are the matching tasks:";
 }

src/main/java/python/ui/Ui.java

@@ -7,7 +7,9 @@
 import python.task.Event;
 import python.task.TaskList;
 import python.task.Todo;
+import python.task.Task;
 
+import java.util.List;
 import java.util.Scanner;
 
 public class Ui {
@@ -51,9 +53,9 @@ public void displayTaskCount() {
         addEmojiAndPrint("You have " + TaskList.getNumberOfTasks() + " tasks!");
     }
 
-    public void displayTasks() {
-        for (int taskNo = 0; taskNo < TaskList.getNumberOfTasks(); taskNo++) {
-            System.out.printf("\t\t\t%d. %s\n", taskNo + 1, TaskList.getTask(taskNo));
+    public void displayTasks(List<Task> tasks) {
+        for (int taskNo = 0; taskNo < tasks.size(); taskNo++) {
+            System.out.printf("\t\t\t%d. %s\n", taskNo + 1, tasks.get(taskNo));
         }
     }
 
@@ -75,7 +77,7 @@ private void handleByeCommand() {
 
     private void handleListCommand() {
         displayTaskCount();
-        displayTasks();
+        displayTasks(TaskList.getTasks());
     }
 
     private void handleMarkCommand() throws PythonException {
@@ -224,6 +226,23 @@ private void handleEventCommand() throws PythonException {
         displayTaskCount();
     }
 
+    private void handleFindCommand() throws PythonException {
+        String keyword;
+        try {
+            keyword = Parser.extractKeywordFromInputLine(inputLine);
+        } catch (ArrayIndexOutOfBoundsException e) {
+            throw new PythonException(Message.MESSAGE_KEYWORD_AFTER_COMMAND);
+        }
+
+        List<Task> matchedTasks = TaskList.findTask(keyword);
+
+        if (matchedTasks.isEmpty()) addEmojiAndPrint(Message.MESSAGE_NO_MATCH);
+        else {
+            addEmojiAndPrint(Message.MESSAGE_MATCHES_FOUND);
+            displayTasks(matchedTasks);
+        }
+    }
+
     private void handleUnknownCommand() throws PythonException {
         if (inputLine.isEmpty()) {
             addEmojiAndPrint(Message.MESSAGE_EMPTY_COMMAND_JOKE);
@@ -260,6 +279,9 @@ public void executeLine() throws PythonException {
         case Command.COMMAND_EVENT:
             handleEventCommand();
             break;
+        case Command.COMMAND_FIND:
+            handleFindCommand();
+            break;
         default:
             handleUnknownCommand();
             break;

text-ui-test/EXPECTED.TXT

@@ -101,6 +101,15 @@
 	🐍: [E][ ] OOP Lecture (from: 12pm to: 2pm)
 	🐍: You have 8 tasks!
 	————————————————————————————————————————————————————————————————————————————————
+	🐍: Here are the matching tasks:
+			1. [T][ ] borrow book
+			2. [D][X] return book (by: Sunday)
+			3. [D][ ] return book (by: 2 June)
+	————————————————————————————————————————————————————————————————————————————————
+	Error: Command must be followed by a keyword!
+	————————————————————————————————————————————————————————————————————————————————
+	🐍: No matching tasks found!
+	————————————————————————————————————————————————————————————————————————————————
 	🐍: You have 8 tasks!
 			1. [T][ ] borrow book
 			2. [T][X] borrow cycle

text-ui-test/input.txt

@@ -28,6 +28,9 @@ event OOP Lecture
 event OOP Lecture /from 12pm
 event OOP Lecture /from /to 2pm
 event OOP Lecture /from 12pm /to 2pm
+find book
+find
+find exam
 list
 unmark 3
 unmark 4