[W7][T09-2] Zhang Jingchen

docs/UserGuide.adoc

@@ -133,6 +133,24 @@ Views all details of the 2nd person in the address book.
 `viewall 1` +
 Views all details of the 1st person in the results of the `find` command.
 
+== View the last command you typed in previously : `last`
+
+Displays the last command you typed in(not including 'last') previously +
+Format: `last`
+
+****
+Shows the latest command typed in.
+****
+
+Examples:
+
+* `add something` +
+This is the previous command for demo.
+
+* `last` +
+`add something` +
+Displays the last command `add something`
+
 == Clearing all entries : `clear`
 
 Clears all entries from the address book. +

src/seedu/addressbook/commands/HelpCommand.java

@@ -18,6 +18,7 @@ public class HelpCommand extends Command {
             + "\n" + ListCommand.MESSAGE_USAGE
             + "\n" + ViewCommand.MESSAGE_USAGE
             + "\n" + ViewAllCommand.MESSAGE_USAGE
+            + "\n" + LastCommand.MESSAGE_USAGE
             + "\n" + HelpCommand.MESSAGE_USAGE
             + "\n" + ExitCommand.MESSAGE_USAGE;
 

src/seedu/addressbook/commands/LastCommand.java

@@ -0,0 +1,24 @@
+package seedu.addressbook.commands;
+
+/**
+ * Show last command.
+ * Set the current command inside the input bar to last command.
+ */
+public class LastCommand extends Command{
+
+    public static final String COMMAND_WORD = "last";
+
+    public static final String MESSAGE_USAGE = COMMAND_WORD + ":\n"
+            + "Last command typed: \n\t";
+
+    public String lastCommand;
+
+    public LastCommand(String last) {
+        this.lastCommand = last;
+    }
+
+    @Override
+    public CommandResult execute() {
+        return new CommandResult(MESSAGE_USAGE + lastCommand);
+    }
+}

src/seedu/addressbook/logic/Logic.java

@@ -19,6 +19,8 @@ public class Logic {
 
     private StorageFile storage;
     private AddressBook addressBook;
+    private String lastCommand = "";
+
 
     /** The list of person shown to the user most recently.  */
     private List<? extends ReadOnlyPerson> lastShownList = Collections.emptyList();
@@ -66,15 +68,30 @@ protected void setLastShownList(List<? extends ReadOnlyPerson> newList) {
 
     /**
      * Parses the user command, executes it, and returns the result.
+     * Record this user command.
      * @throws Exception if there was any problem during command execution.
      */
     public CommandResult execute(String userCommandText) throws Exception {
+        userCommandText = checkLastCommand(userCommandText);
         Command command = new Parser().parseCommand(userCommandText);
         CommandResult result = execute(command);
         recordResult(result);
         return result;
     }
 
+    /**
+     * Check if the command is "last".
+     * If yes then append the lastCommand for later execution.
+     */
+    private String checkLastCommand(String userCommandText) throws Exception {
+        if( userCommandText.substring(0, Math.min(userCommandText.length(), 4)).equals("last")) {
+            userCommandText = userCommandText.concat(" ").concat(lastCommand);
+        } else {
+            lastCommand = userCommandText;
+        }
+        return userCommandText;
+    }
+
     /**
      * Executes the command, updates storage, and returns the result.
      *

src/seedu/addressbook/parser/Parser.java

@@ -78,9 +78,12 @@ public Command parseCommand(String userInput) {
             case ViewAllCommand.COMMAND_WORD:
                 return prepareViewAll(arguments);
 
+            case LastCommand.COMMAND_WORD:
+                return new LastCommand(arguments);
+
             case ExitCommand.COMMAND_WORD:
                 return new ExitCommand();
-
+                
             case HelpCommand.COMMAND_WORD: // Fallthrough
             default:
                 return new HelpCommand();

test/java/seedu/addressbook/logic/LogicTest.java

@@ -456,6 +456,21 @@ public void execute_find_matchesIfAnyKeywordPresent() throws Exception {
                                 expectedList);
     }
 
+    /**
+     * The testing function for the newly implement command -LastCommand 
+     *  cannot be implemented because the result of the execution depends
+     *  on the previous executed command.
+
+     @Test
+     public void execute_LastCommand() throws Exception {
+
+     }
+
+      * It should return the last command user typed in previously.
+     */
+
+
+
     /**
      * A utility class to generate test data.
      */

test/java/seedu/addressbook/parser/ParserTest.java

@@ -58,6 +58,12 @@ public void listCommand_parsedCorrectly() {
         parseAndAssertCommandType(input, ListCommand.class);
     }
 
+    @Test
+    public void LastCommand_parsedCorrectly() {
+        final String input = "last";
+        parseAndAssertCommandType(input, LastCommand.class);
+    }
+
     @Test
     public void exitCommand_parsedCorrectly() {
         final String input = "exit";