[W5][W13-3]Ruhani Suri

docs/UserGuide.adoc

@@ -111,6 +111,22 @@ Deletes the 2nd person in the address book.
 `delete 1` +
 Deletes the 1st person in the results of the `find` command.
 
+== Listing all previous commands: `history`
+
+Displays all user entered commands in reverse chronological order. +
+Format: `history`
+
+****
+Shows all previous commands, with the latest ones first.
+****
+
+Examples:
+
+* `history` +
+`delete 2` +
+`list`
+
+
 == View non-private details of a person : `view`
 
 Displays the non-private details of the specified person. +

src/seedu/addressbook/Main.java

@@ -3,6 +3,7 @@
 import java.util.Collections;
 import java.util.List;
 import java.util.Optional;
+import java.util.Stack;
 
 import seedu.addressbook.commands.Command;
 import seedu.addressbook.commands.CommandResult;
@@ -24,7 +25,7 @@ public class Main {
 
     /** Version info of the program. */
     public static final String VERSION = "AddressBook Level 2 - Version 1.0";
-
+    public static Stack<String> CommandHistory = new Stack<>();
     private TextUi ui;
     private StorageFile storage;
     private AddressBook addressBook;
@@ -83,7 +84,10 @@ private void runCommandLoopUntilExitCommand() {
         Command command;
         do {
             String userCommandText = ui.getUserCommand();
-            command = new Parser().parseCommand(userCommandText);
+            CommandHistory.push(userCommandText);
+            Parser parser = new Parser();
+            parser.CHStack = CommandHistory;
+            command = parser.parseCommand(userCommandText);
             CommandResult result = executeCommand(command);
             recordResult(result);
             ui.showResultToUser(result);

src/seedu/addressbook/commands/HelpCommand.java

@@ -23,6 +23,7 @@ public CommandResult execute() {
                 + "\n" + ViewAllCommand.MESSAGE_USAGE
                 + "\n" + HelpCommand.MESSAGE_USAGE
                 + "\n" + ExitCommand.MESSAGE_USAGE
+                + "\n" + HistoryCommand.MESSAGE_USAGE
         );
     }
 }

src/seedu/addressbook/commands/HistoryCommand.java

@@ -0,0 +1,29 @@
+package seedu.addressbook.commands;
+
+
+import java.util.Stack;
+
+//import static seedu.addressbook.Main.CommandHistory;
+
+/**
+ * Displays all the past commands inputted by the user.
+ */
+public class HistoryCommand extends Command {
+
+    public static final String COMMAND_WORD = "history";
+    public static final String MESSAGE_USAGE = "Shows all the commands history in reverse chronological order.\n"
+            + "Example: " + COMMAND_WORD;
+
+    public static final String MESSAGE_SUCCESS = "Displaying all past commands!";
+
+    public static Stack<String> CommandHistory;
+
+    @Override
+    public CommandResult execute() {
+        Stack<String> CHCopy = (Stack<String>) CommandHistory.clone();
+        while (!CHCopy.empty()) {
+            System.out.println("|| " + CHCopy.pop());
+        }
+        return new CommandResult(MESSAGE_SUCCESS);
+    }
+}

src/seedu/addressbook/parser/Parser.java

@@ -3,11 +3,7 @@
 import static seedu.addressbook.common.Messages.MESSAGE_INVALID_COMMAND_FORMAT;
 import static seedu.addressbook.common.Messages.MESSAGE_INVALID_PERSON_DISPLAYED_INDEX;
 
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.HashSet;
-import java.util.Set;
+import java.util.*;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -22,6 +18,7 @@
 import seedu.addressbook.commands.ListCommand;
 import seedu.addressbook.commands.ViewAllCommand;
 import seedu.addressbook.commands.ViewCommand;
+import seedu.addressbook.commands.HistoryCommand;
 import seedu.addressbook.data.exception.IllegalValueException;
 
 /**
@@ -41,6 +38,7 @@ public class Parser {
                     + " (?<isAddressPrivate>p?)a/(?<address>[^/]+)"
                     + "(?<tagArguments>(?: t/[^/]+)*)"); // variable number of tags
 
+    public static Stack<String> CHStack;
 
     /**
      * Signals that the user input could not be parsed.
@@ -73,6 +71,11 @@ public Command parseCommand(String userInput) {
 
         switch (commandWord) {
 
+        case HistoryCommand.COMMAND_WORD:
+            HistoryCommand hcexecute = new HistoryCommand();
+            hcexecute.CommandHistory = CHStack;
+            return hcexecute;
+
         case AddCommand.COMMAND_WORD:
             return prepareAdd(arguments);
 

test/expected.txt

@@ -29,6 +29,13 @@
 || Example: help
 || exit: Exits the program.
 || Example: exit
+|| Shows all the commands history in reverse chronological order.
+|| Example: history
+|| ===================================================
+|| Enter command: || [Command entered:  history]
+||   history
+||   sfdfd
+|| Displaying all past commands!
 || ===================================================
 || Enter command: || [Command entered:  delete 1]
 || The person index provided is invalid

test/input.txt

@@ -4,6 +4,7 @@
 
   # should recognise invalid command
   sfdfd
+  history
 
 ##########################################################
 # commands using list index before any listing created