Merge pull request #88 from Araavinds/b-listtags

Adds new command to list based on tag.
Resolves Issue #63

src/main/java/executor/command/CommandListTag.java

@@ -0,0 +1,47 @@
+package executor.command;
+
+import executor.task.TaskList;
+import interpreter.Parser;
+import ui.ReceiptTracker;
+import ui.Ui;
+import ui.Wallet;
+import java.text.DecimalFormat;
+
+public class CommandListTag extends CommandList {
+    private String tag;
+
+    //Constructor
+    /**
+     * Constructor for CommandListTag subCommand Class.
+     * @param userInput The user input from the CLI
+     */
+    public CommandListTag(String userInput) {
+        super(userInput);
+        this.userInput = userInput;
+        this.description = "Lists based on tag";
+        this.commandType = CommandType.TAGLIST;
+        this.tag = Parser.parseForPrimaryInput(this.commandType, userInput);
+    }
+
+    @Override
+    public void execute(TaskList taskList) {
+
+    }
+
+    @Override
+       public void execute(Wallet wallet) {
+        ReceiptTracker taggedReceipts = wallet.getReceipts().findReceiptsByTag(this.tag);
+        DecimalFormat decimalFormat = new DecimalFormat("#0.00");
+        Ui.dukeSays("You spent a total of $"
+                +
+                decimalFormat.format(taggedReceipts.getTotalCashSpent())
+                + " "
+                + "on"
+                + " "
+                + tag
+        );
+        Ui.printSeparator();
+        taggedReceipts.printReceipts();
+        Ui.printSeparator();
+    }
+}

src/main/java/executor/command/CommandType.java

@@ -22,6 +22,7 @@ public enum CommandType {
     TODO(CommandNewTask.class),
     RECUR(CommandNewTask.class),
     FDURATION(CommandNewTask.class),
+    TAGLIST(CommandListTag.class),
     EXPENDED(CommandGetSpendingByMonth.class),
     CONVERT(CommandConvert.class),
     ERROR(CommandError.class);

src/main/java/ui/ReceiptTracker.java

@@ -81,11 +81,11 @@ public void addFolder(String tag) throws DukeException {
      * @param tag Specific String to be filtered with.
      * @return ArrayList containing all the Receipts with the specific tag
      */
-    public ArrayList<Receipt> findReceiptsByTag(String tag) {
-        ArrayList<Receipt> taggedReceipts = new ArrayList<>();
+    public ReceiptTracker findReceiptsByTag(String tag) {
+        ReceiptTracker taggedReceipts = new ReceiptTracker();
         for (Receipt receipt : this) {
             if (receipt.containsTag(tag)) {
-                taggedReceipts.add(receipt);
+                taggedReceipts.addReceipt(receipt);
             }
         }
         return taggedReceipts;